0.3.39-alpha: version and release notes

# Conflicts:
#	gearslip/src/main/java/app/seb3thehacker/gearslip/ui/CarPreviewScreen.kt

.github/FUNDING.yml

@@ -10,6 +10,6 @@ liberapay: Seb3thehacker
 issuehunt: # Replace with a single IssueHunt username
 lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
 polar: # Replace with a single Polar username
-buy_me_a_coffee: # Replace with a single Buy Me a Coffee username
+buy_me_a_coffee: seb3thehacker
 thanks_dev: # Replace with a single thanks.dev username
 custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -5,7 +5,7 @@ body:
   - type: markdown
     attributes:
       value: |
-        Thanks for reporting. Check the [open issues](https://github.com/Seb3thehacker/gearslip/issues) first, in case someone has already reported it.
+        Thanks for reporting. Check the [open issues](https://github.com/twinksoftware/gearslip/issues) first, in case someone has already reported it.
 
   - type: input
     id: car

.github/release-notes.md

@@ -1,26 +1,31 @@
-Gearslip 0.3 goes wireless, takes voice commands, and works with the car's rotary knob.
+Gearslip 0.3.39 runs as a head unit's home screen, connects to more cars, and brings Google Maps and Waze turns to the car.
+
+This is a pre-release. Many of these fixes target cars we don't own, so please try it and tell us how your car does. Attach a log to your issue: open Gearslip, tap Logs, then Share log.
 
 ## New
-- **Wireless Android Auto.** Pair the phone with the car once, and leave the cable at home.
-- **Voice control, on the phone.** Say "navigate to a gas station", "play" a song or artist, or open an app by name. Gearslip turns speech into text itself, so it needs no Google account. "Navigate to" picks the nearest place and stops at the map app's start screen.
-- **The rotary knob.** The car's knob moves between buttons, so cars without a touchscreen work too.
-- **Music over Bluetooth or USB.** Bluetooth plays as the phone normally would. USB has no delay but asks to share audio each drive. Gearslip offers to pair with the car the first time.
-- **Directions on the car.** The car speaks each turn from your map app, and shows the directions on its own display where it can.
-- **Updates in the app.** Gearslip finds new versions and installs them, with an optional beta channel.
-- **Button styles** for the car screen, picked in the intro or the car's settings.
+- Launcher mode: on a head unit that runs Android, or a spare phone or tablet on the dash, Gearslip can be the home screen. Turn it on under Settings > Connection. An All apps page opens everything else.
+- Turns from Google Maps or Waze on the phone show in the car's nav bar and on its instrument cluster.
+- An Apps card on the phone's home screen lets you hide apps from the car's drawer. Thanks to @johnneerdael.
+- A display density setting makes text and buttons bigger in car apps on small screens. Thanks to @johnneerdael.
+- A Language setting picks Gearslip's language, and spoken directions use a voice in that language.
+- Alerts from car apps show on the car screen, such as Waze asking whether a hazard is still there.
+- AntennaPod gets a Next chapter button.
+- The car list shows the names you gave your Bluetooth devices. Thanks to @theo330.
+- A car you once turned away can connect on its own again, from the car list.
 
 ## Fixed
-- More cars play music over USB, including ones that refused Gearslip's audio before.
-- Cars that give no screen size get a sharper picture, up to 1080p, and taps land where you press on cars that crop the edges.
-- A new destination mid-route replaces the old route, and switching map apps ends the old app's route.
-- Tidal's like and shuffle buttons show their real state.
-- MapQuest finds your location.
+- Cars that waited for the music channel before showing a picture now show Gearslip's screen. This should fix the black screen or endless "Starting video" on the 2017 Pilot, 2020 Civic, 2021 CX-5 and 2024 Mirage.
+- Gearslip sends the car its icon and a session ID, as a real phone does. Older Hyundais that stopped after the first request should now connect.
+- Gearslip pings the car once a second, as a real phone does. This may stop the 2021 Bolt from hanging up after 25 seconds.
+- A still car screen gets a fresh frame every second, which should fix the black screen on some aftermarket boxes.
+- Wireless keeps calling the car until it answers, starts over after a failed step, and stays connected with the phone locked.
+- Music playing through Gearslip comes back after a call.
+- Car maps keep the phone's position while the phone is locked.
+- Spoken directions start the speech engine again when it fails to start.
+- Error messages say when the car's clock is wrong, and what to try when a connection gets stuck.
 
-## Changed
-- The app is half the size: 30 MB instead of 65.
-- On GrapheneOS, Gearslip no longer needs exploit protection compatibility mode.
-- The car warns you when the phone's location is off.
-- Support Gearslip through Liberapay or Monero, in Settings.
+## For a few cars
+- Directions over the music channel, under Spoken directions in the car's settings: for a car that drops the connection or restarts after a spoken turn.
+- Phone's Bluetooth address, under Settings > Connection: for a car that drops the phone's Bluetooth when Gearslip connects. Copy the address from Android's Settings > About phone.
 
-## Known issues
-- Phone calls are unstable right now and may drop or fail to connect.
+New text is in English until translators catch up. Help with your language on [Weblate](https://hosted.weblate.org/engage/gearslip/).

CARS.md

@@ -23,6 +23,7 @@ and some don't say.
 | Jeep Cherokee | 2019 | Uconnect 8.4 (Delphi) |
 | MG | 2019 | Desay SV |
 | Ram 1500 | 2018 | Uconnect 8.4 (Panasonic) |
+| Renault Clio V | 2019-2024 | Easy Link |
 | Škoda | 2018 | MIB Standard2 (TechniSat) |
 | Subaru Outback | 2020 | Denso |
 | Toyota RAV4 | 2020 | Pioneer T1 |

CLA.md

@@ -88,6 +88,9 @@ We are not required to use or include any Contribution.
 Most contributors sign on GitHub: the CLA Assistant bot comments on your first pull request,
 and you sign there with one click. Your GitHub account then serves as your signature.
 
+Translators sign on Weblate: it shows this agreement before your first translation, and
+accepting it there serves as your signature.
+
 To sign by hand instead, fill in the following and send it to us on Matrix. The address is
 on the [Seb3thehacker GitHub profile](https://github.com/Seb3thehacker).
 

CONTRIBUTING.md

@@ -5,7 +5,7 @@ start there if you aren't sure where to begin.
 
 ## Reporting a bug
 
-Open an issue on [GitHub](https://github.com/Seb3thehacker/gearslip/issues) and include:
+Open an issue on [GitHub](https://github.com/twinksoftware/gearslip/issues) and include:
 
 - your car's make, model, and year, and whether the head unit is the original one; and
 - the log from the drive. Open Logs on the phone app's home screen and tap Share log.
@@ -38,6 +38,24 @@ branch on `experimental`, and open your pull request against it.
 - Gearslip asks for no adb, root, or Shizuku. A feature must work with ordinary Android
   permissions and on-device consent dialogs.
 
+## Translating
+
+Translations happen on [Weblate](https://hosted.weblate.org/engage/gearslip/), never in pull
+requests. Pick your language, or start a new one, and translate in the browser. Weblate
+sends the finished work to this repository as a pull request.
+
+Don't edit the translated `values-*/strings.xml` files by hand. Weblate keeps its own copy of
+every language, so a change made in git collides with Weblate's next update, and the pull
+request that made it gets closed. If a code change adds or rewords text, change only the
+English file, `values/strings.xml`; Weblate picks up the new strings for translators.
+
+Keep the tone of the English: short, plain, and friendly. Leave placeholders such as `%1$s`
+and `%1$d` in place; Gearslip fills them with names and numbers. Untranslated strings show
+in English, so a partial translation is still useful.
+
+Before your first translation, Weblate asks you to accept the
+[Contributor License Agreement](CLA.md). That counts as signing it.
+
 ## Writing
 
 Text that users read, such as screens, release notes, and docs, follows Strunk's

LICENSE

@@ -1,4 +1,4 @@
-Copyright (C) 2026 seb
+Copyright (C) 2026 Twink Software LLC and contributors
 
                     GNU AFFERO GENERAL PUBLIC LICENSE
                        Version 3, 19 November 2007

NOTICE.md

@@ -6,4 +6,4 @@ You may use, run, and modify Gearslip freely. If you distribute a modified versi
 
 ## Commercial licensing
 
-If the AGPL's terms don't work for you, the author sells a separate commercial license. The usual case is a company that wants to use Gearslip privately without publishing its changes. Terms, including any limits on modification, are set case by case. Contact me on Matrix; the address is on my profile.
+If the AGPL's terms don't work for you, Twink Software LLC, which owns Gearslip, sells a separate commercial license. The usual case is a company that wants to use Gearslip privately without publishing its changes. Terms, including any limits on modification, are set case by case. Contact us on Matrix; the address is on the [Seb3thehacker GitHub profile](https://github.com/Seb3thehacker).

README.md

@@ -7,15 +7,30 @@ An Android Auto alternative built for everyone.
 
 [![forthebadge](https://forthebadge.com/badges/compatibility-club-penguin.svg)](https://forthebadge.com)
 
-[<img src="https://raw.githubusercontent.com/ImranR98/Obtainium/main/assets/graphics/badge_obtainium.png" alt="Get it on Obtainium" height="80">](https://apps.obtainium.imranr.dev/redirect?r=obtainium://add/https://github.com/Seb3thehacker/gearslip)
+[<img src="https://raw.githubusercontent.com/ImranR98/Obtainium/main/assets/graphics/badge_obtainium.png" alt="Get it on Obtainium" height="80">](https://apps.obtainium.imranr.dev/redirect?r=obtainium://add/https://github.com/twinksoftware/gearslip)
+
+[Fix or add your language on Weblate](https://hosted.weblate.org/engage/gearslip/).
+Translations go through Weblate only; pull requests that edit them get closed.
+
+[![Translation status by language](https://hosted.weblate.org/widget/gearslip/app/multi-auto.svg)](https://hosted.weblate.org/engage/gearslip/)
 
 Questions, ideas?
 [Join the discussion on Matrix](https://matrix.to/#/!mf0_mgBd5KqKpc9FfX_wHp1jFCcwAtPrndIn_oGIyMk?via=matrix.org).
 
+> [!WARNING]
+> Gearslip is **alpha software**. It can drop the connection, freeze the car screen, or fail
+> to start, and a new release can break a car that worked before. Set it up while parked, and
+> keep another way to navigate.
+
+> [!WARNING]
+> On GrapheneOS, make sure **USB-C port control** isn't set to **Charging-only**. That setting
+> blocks USB data, so the car never sees the phone, even with a data cable. Set it to allow
+> data transfer.
+
 ## Which cars work
 
-Most cars work. Starting around 2020, some cars added newer security standards that reject
-Gearslip's certificate, and Gearslip can't run in those cars. [CARS.md](CARS.md) lists the
+Most cars work. Starting around 2020, some cars added newer security checks that reject
+the aasdk certificate, and in those cars Gearslip needs a certificate of your own. [CARS.md](CARS.md) lists the
 cars drivers have confirmed.
 
 ## What Gearslip is
@@ -29,25 +44,29 @@ screen-sharing mode.
 
 | | |
 |---|---|
-| ![The launcher, with apps grouped into phone, maps, music, and messaging](docs/screenshots/launcher.png) | ![Vela Maps giving turn-by-turn directions, with the music player beside the map](docs/screenshots/navigation.png) |
-| Apps sorted by kind. A check marks the ones that work. | Vela Maps navigating, with the player beside it. |
-| ![ViVi Music's song, art, and controls in Gearslip's player](docs/screenshots/music.png) | ![A new message card over Organic Maps](docs/screenshots/message.png) |
-| ViVi Music in Gearslip's player. | A new message, read aloud at a tap, over the map. |
-| ![The dashboard, with the weather, the next calendar event, and recent notifications](docs/screenshots/dashboard.png) | ![DuckDuckGo open in Gearslip's web browser](docs/screenshots/web.png) |
-| The weather, your next event, and what you missed. | Browse the web while parked. |
+| ![The launcher, with every car app on the phone](docs/screenshots/launcher.png) | ![Vela Maps showing the route, with the music player beside the map](docs/screenshots/navigation.png) |
+| Your car apps in one place. | Vela Maps navigating, with the player beside it. |
+| ![Metrolist's song, art, and controls in Gearslip's player](docs/screenshots/music.png) | ![A new message card over Vela Maps](docs/screenshots/message.png) |
+| Metrolist in Gearslip's player. | A new message, read aloud at a tap, over the map. |
+| ![Synced lyrics beside the player, lit up to the word being sung](docs/screenshots/lyrics.png) | ![DuckDuckGo open in Gearslip's web browser](docs/screenshots/web.png) |
+| Lyrics light up word by word as the song plays. | Browse the web while parked. |
+| ![The voice assistant listening over Vela Maps](docs/screenshots/assistant.png) | ![Three routes to a coffee shop in Vela Maps, each with its time and distance](docs/screenshots/places.png) |
+| Ask for a place, a song, or an app. | Pick a route to a coffee shop. Each one shows its time and distance. |
 
 ## Features
 
 - **Phone calls.** Dial from a keypad, or search your contacts, then confirm before the
-  call goes out. When a call comes in, answer or decline it on the car screen.
+  call goes out. When a call comes in, answer or decline it on the car screen. During a
+  call, the nav bar shows who you're talking to, and you mute or hang up from there.
 - **Navigation.** Gearslip hosts real Car App Library map apps on the car screen.
-  Organic Maps, OsmAnd, and Flitsmeister work today. Vela runs, with rough
-  edges.
+  Organic Maps, Vela, OsmAnd, Flitsmeister, MAPS.ME, and MapQuest work today. While you
+  navigate, a big turn card on the left shows the arrow, the distance, and your lane, and
+  the map keeps the right side.
 - **Music.** Browse, play, and queue tracks from a car-enabled media app, with a Now
   Playing view, an Up Next queue, and lyrics. Type a search, and apps that accept one
   play the best match.
-- **The web.** A browser template with its own on-screen keyboard, for anything that
-  doesn't ship a car interface of its own.
+- **The web.** A browser with an address bar, back and forward, and its own on-screen
+  keyboard, for anything that doesn't ship a car interface of its own.
 - **Weather and the day ahead.** A dashboard screen shows the week's calendar next to
   the current and coming weather.
 - **Voice.** Tap the mic, or press the talk button on the wheel, and say "navigate to the
@@ -61,33 +80,40 @@ screen-sharing mode.
 - **Your apps, your order.** The launcher groups apps by kind: phone, maps, music,
   messaging, and the rest. Press and hold an app to move it.
 - **Car controls.** Steering wheel buttons, control knobs, and D-pads all work.
+- **Your phone's colors.** The car screen and the phone app take their colors from your
+  phone's Material You palette, and every card and button matches.
 - **Themes.** Choose flat buttons or skeuomorphic ones that look like real keys.
+- **Settings on the phone.** The car's settings sit on the phone's home screen too, so you
+  can set things up before you drive. A change on either screen shows on both.
 
 ## Status
 
 - **Wired or wireless.** Plug the phone into the car's USB port, or, in a car with wireless
   Android Auto, tap Connect wirelessly and pick the car. Pair the phone with the car over
-  Bluetooth first.
+  Bluetooth first. After the first wireless drive, Android asks once whether Gearslip may
+  watch for that car; from then on, Gearslip connects whenever the car's Bluetooth does.
 - **Setup walks you through it.** First launch asks for the Android Auto certificate,
   then one permission at a time, each with a plain reason and an Allow or Skip. A help
   screen inside the car answers anything setup didn't cover.
-- **Templated apps work.** Gearslip renders all 16 template types that the Car App
-  Library defines, and it draws its own keyboard for search, sign-in, and text fields.
-  It has been tested against several real navigation and media apps.
+- **Templated apps work.** Gearslip renders the Car App Library's templates on the car
+  screen, and it draws its own keyboard for search, sign-in, and text fields. It has been
+  tested against several real navigation and media apps.
 - **Gearslip works with [LIVI](https://github.com/f-io/LIVI),** the open-source head unit
   used in homemade car dashboards.
 - **Some apps refuse Gearslip.** Spotify, Waze, and Google Messages use a version of
   Google's car library that accepts only Android Auto itself. Spotify still plays through
-  Gearslip's own player.
+  Gearslip's own player. TIDAL lets only approved apps browse its library.
 - **Calls use the car's Bluetooth,** as they do in Android Auto. Pair the phone with the
   car to hear calls through its speakers.
-- **Music reaches the car over Bluetooth or USB.** Setup asks which. Bluetooth is the
-  default: Android never asks for permission, and your map app's voice reaches the car
-  too. USB sounds a little clearer, with no delay, but Android shows a screen-share
-  consent dialog once per drive. Gearslip never reads the screen; capturing playback is
-  the only way an ordinary app can pass another app's audio along.
+- **Music reaches the car over Bluetooth or through Gearslip.** Setup asks which.
+  Bluetooth is the default: Android never asks for permission, and your map app's voice
+  reaches the car too. Through Gearslip, the sound travels over the car connection, cable
+  or wireless. It sounds a little clearer, with no delay, but each drive Android asks you
+  to share your screen, which lets Gearslip send the sound. Gearslip never reads the
+  screen; capturing playback is the only way an ordinary app can pass another app's audio
+  along.
 - **Gearslip needs no adb, root, or Shizuku.** Every feature relies on an ordinary
-  Android permission or an on-device consent dialog. For USB audio, setup offers two
+  Android permission or an on-device consent dialog. For audio through Gearslip, setup offers two
   optional adb commands: one removes the audio dialog for good, and the other keeps
   notifications visible while audio plays.
 - **Updates come from GitHub.** Once a day, Gearslip checks this repository's latest
@@ -95,6 +121,17 @@ screen-sharing mode.
   SHA-256, and installs it through Android's own installer. Turn off automatic checks in
   Settings.
 
+## Verify your download
+
+Check that your copy of Gearslip is genuine with
+[AppVerifier](https://github.com/soupslurpr/AppVerifier): share this block to it, or compare it
+with the output of `apksigner verify --print-certs`.
+
+```
+app.seb3thehacker.gearslip
+4C:C5:6E:BD:D1:3A:54:D2:60:EC:A9:B7:E2:B2:AE:6B:30:E2:F2:25:BF:DA:8F:50:8F:07:09:ED:F0:84:94:8B
+```
+
 ## Usage notes
 
 Gearslip can send short notes that show which cars it works in. They stay off unless you
@@ -106,7 +143,7 @@ turn them on, in setup or in Settings.
   those boxes cover: the Android version and whether the phone runs GrapheneOS, the phone
   model, whether a car connected that day, and each car's head unit, model, year, screen
   size, and connection result, with whether that drive used the cable or wireless and
-  whether music went over USB or Bluetooth. If you tick it, how each drive went: how far
+  whether music went through Gearslip or over Bluetooth. If you tick it, how each drive went: how far
   the connection got, how long it lasted, and how it ended. Settings shows the exact note. Untick a phone detail, and
   the server drops the copy it kept.
 - **What they leave out.** Your name, accounts, location, contacts, messages, and
@@ -133,6 +170,11 @@ Bug reports from real cars help most, and pull requests are welcome.
 [CONTRIBUTING.md](CONTRIBUTING.md) explains what to put in a report, which branch to work
 on, and the one-time agreement you sign before your first pull request merges.
 
+To help translate Gearslip into your language, join
+[Gearslip on Weblate](https://hosted.weblate.org/engage/gearslip/). No coding needed. Please
+don't send translations as pull requests: Weblate holds its own copy of every language, and
+changes made in git collide with it.
+
 ## Building
 
 ```
@@ -170,5 +212,6 @@ any of these companies. All other names belong to their owners.
 
 ## License
 
-Gearslip is licensed under AGPL-3.0; see [LICENSE](LICENSE). The author offers a separate
-commercial license for private use outside the AGPL's terms; see [NOTICE.md](NOTICE.md).
+Gearslip belongs to Twink Software LLC and is licensed under AGPL-3.0; see [LICENSE](LICENSE).
+The LLC also sells a separate commercial license for private use outside the AGPL's terms; see
+[NOTICE.md](NOTICE.md).

gearslip/build.gradle.kts

@@ -38,9 +38,9 @@ android {
         applicationId = "app.seb3thehacker.gearslip"
         minSdk = 31
         targetSdk = 37
-        versionCode = 9
+        versionCode = 14
         // -PgearslipVersionName=0.1.99-test makes a build that thinks it's older, to try the updater.
-        versionName = project.findProperty("gearslipVersionName")?.toString() ?: "0.3.00-alpha"
+        versionName = project.findProperty("gearslipVersionName")?.toString() ?: "0.3.39-alpha"
         manifestPlaceholders["appLabel"] = "Gearslip"
         // Where opted-in phones send their daily usage note: the stats-worker/ Worker's address,
         // set as gearslipStatsUrl in gradle.properties. Left empty, nothing is ever sent.
@@ -74,8 +74,12 @@ android {
             applicationIdSuffix = ".dev"
             signingConfigs.findByName("release")?.let { signingConfig = it }
             manifestPlaceholders["appLabel"] = "Gearslip Debug"
-            // -Pr8 shrinks a debug build like a release one, to test R8 in the debug install.
-            if (project.hasProperty("r8")) {
+            // English (XA) and Arabic (XB) under the phone's languages: stretched, accented and
+            // right-to-left text, which shows what's still hardcoded and what doesn't fit.
+            isPseudoLocalesEnabled = true
+            // Shrunk with R8 like a release, so a debug install behaves like what ships (a keep
+            // rule missing for release shows up here first). -PnoR8 skips it for a quicker build.
+            if (!project.hasProperty("noR8")) {
                 isMinifyEnabled = true
                 isShrinkResources = true
                 proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
@@ -87,6 +91,18 @@ android {
         buildConfig = true
     }
 
+    // Lists each language that has a translation in the app's locale config, so Android 13+
+    // offers it under the system's per-app languages. English is the unqualified default
+    // (res/resources.properties).
+    androidResources {
+        generateLocaleConfig = true
+    }
+
+    lint {
+        // Weblate fills languages in a string at a time; the rest fall back to English.
+        disable += "MissingTranslation"
+    }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_21
         targetCompatibility = JavaVersion.VERSION_21
@@ -105,9 +121,10 @@ android {
 
 }
 
-// Renames the produced APK and moves it to the root build/ folder (<root>/build/Gearslip-debug.apk)
-// after the fact rather than fighting AGP's variant-output API across versions - simpler and
-// doesn't break when that API moves again.
+// Copies the produced APK to the root build/ folder (<root>/build/Gearslip-debug.apk) after the
+// fact rather than fighting AGP's variant-output API across versions - simpler and doesn't break
+// when that API moves again. A copy, not a move: AGP packages incrementally into the APK it left
+// last time, and with that file gone a build came out holding nothing but classes.dex.
 tasks.register("renameApk") {
     doLast {
         val rootBuildDir = rootProject.layout.buildDirectory.get().asFile
@@ -117,7 +134,6 @@ tasks.register("renameApk") {
             .forEach { apk ->
                 val renamed = File(rootBuildDir, "Gearslip-${apk.parentFile.name}.apk")
                 apk.copyTo(renamed, overwrite = true)
-                apk.delete()
             }
     }
 }
@@ -129,7 +145,6 @@ dependencies {
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.compose.ui)
     implementation(libs.androidx.compose.material3)
-    implementation(libs.commons.compress)
     implementation(libs.androidx.compose.material.icons.core)
     implementation(libs.androidx.activity.compose)
     implementation(libs.androidx.lifecycle.runtime.compose)

gearslip/proguard-rules.pro

@@ -11,10 +11,3 @@
 
 # Speech-to-text: the native library calls back into these classes by name.
 -keep class com.k2fsa.sherpa.onnx.** { *; }
-
-# commons-compress refers to optional codecs Gearslip doesn't ship.
--dontwarn org.tukaani.xz.**
--dontwarn com.github.luben.zstd.**
--dontwarn org.brotli.dec.**
--dontwarn org.objectweb.asm.**
--dontwarn org.osgi.**

gearslip/src/main/AndroidManifest.xml

@@ -19,12 +19,17 @@
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_LOCATION" />
+    <!-- Keeps a wireless start going with the phone locked; see WirelessKeepAlive. -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
 
     <!--
         Wireless Android Auto: Bluetooth reaches the paired car's Android Auto service, which
         hands over its Wi-Fi details; Gearslip then joins that network to reach the car.
     -->
     <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <!-- Wireless auto-connect: Android tells Gearslip when a car it manages connects. -->
+    <uses-permission android:name="android.permission.REQUEST_OBSERVE_COMPANION_DEVICE_PRESENCE" />
+    <uses-feature android:name="android.software.companion_device_setup" android:required="false" />
     <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />
     <uses-permission
         android:name="android.permission.NEARBY_WIFI_DEVICES"
@@ -123,6 +128,7 @@
         android:roundIcon="@mipmap/ic_launcher"
         android:label="${appLabel}"
         android:supportsRtl="true"
+        android:manageSpaceActivity="app.seb3thehacker.gearslip.ui.ManageSpaceActivity"
         android:theme="@style/Theme.Gearslip">
 
         <provider
@@ -154,11 +160,43 @@
 
         </activity>
 
+        <!--
+          Launcher mode: the car UI as this device's home screen, for a head unit that runs Android
+          or a tablet on the dash. Off until Settings turns it on (LauncherMode), so phones never
+          list Gearslip as a home app.
+        -->
+        <activity
+            android:name=".LauncherActivity"
+            android:enabled="false"
+            android:exported="true"
+            android:launchMode="singleTask"
+            android:excludeFromRecents="true"
+            android:screenOrientation="sensorLandscape"
+            android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize|keyboardHidden|uiMode|density|locale|layoutDirection|fontScale">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.HOME" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+
         <!--
           Answers the car's USB connection on GearslipActivity's behalf. Kept apart from the
           activity so Settings can switch off just this (AppSettings.setGearslipEnabled) and leave
           the head unit to Android Auto, without disabling the screen the switch is on.
         -->
+        <!-- App info › Storage › Manage space: clears lyrics, voice models and logs one at a time. -->
+        <activity
+            android:name=".ui.ManageSpaceActivity"
+            android:exported="true"
+            android:label="Gearslip storage" />
+
+        <activity
+            android:name=".PermissionActivity"
+            android:exported="false"
+            android:excludeFromRecents="true"
+            android:theme="@style/Theme.Gearslip.Invisible" />
+
         <activity-alias
             android:name=".GearslipUsbAccessory"
             android:targetActivity=".GearslipActivity"
@@ -188,6 +226,11 @@
             android:exported="false"
             android:foregroundServiceType="location" />
 
+        <service
+            android:name=".wireless.WirelessKeepAlive"
+            android:exported="false"
+            android:foregroundServiceType="connectedDevice" />
+
         <!--
           Holds the capture session that carries a media app's audio to the car. It also claims
           the microphone, so voice replies can hear the driver with the phone locked.
@@ -244,5 +287,15 @@
                 <action android:name="android.telecom.CallScreeningService" />
             </intent-filter>
         </service>
+
+        <!-- Told when a car approved for wireless auto-connect comes up over Bluetooth. -->
+        <service
+            android:name=".wireless.CarPresenceService"
+            android:exported="true"
+            android:permission="android.permission.BIND_COMPANION_DEVICE_SERVICE">
+            <intent-filter>
+                <action android:name="android.companion.CompanionDeviceService" />
+            </intent-filter>
+        </service>
     </application>
 </manifest>

gearslip/src/main/java/app/seb3thehacker/gearslip/Changelog.kt

@@ -10,6 +10,18 @@ object Changelog {
     class Release(val versionCode: Int, val versionName: String, val changes: List<String>)
 
     val releases = listOf(
+        Release(
+            14, "0.3.39-alpha",
+            listOf(
+                "Turns from Google Maps or Waze on the phone show in the nav bar and on the car's cluster.",
+                "Alerts from car apps show here, such as Waze asking whether a hazard is still there.",
+                "Hide apps you don't use in the car from the Apps card on the phone.",
+                "Make text in car apps bigger with Car display density, under Screen.",
+                "Music playing through Gearslip comes back after a call.",
+                "Maps keep your position while the phone is locked.",
+                "Wireless keeps trying until the car answers.",
+            ),
+        ),
         Release(
             9, "0.3.00-alpha",
             listOf(

gearslip/src/main/java/app/seb3thehacker/gearslip/ClusterVideo.kt

@@ -0,0 +1,164 @@
+package app.seb3thehacker.gearslip
+
+import android.content.Context
+import android.os.Handler
+import android.os.Looper
+import app.seb3thehacker.gearslip.car.ClusterScreen
+
+/**
+ * Gearslip's picture on the car's instrument-cluster screen: a second video sink, for a car that
+ * offers one, showing the turn card ([ClusterScreen]). The same exchange as the main screen's,
+ * on its own channel, with its own encoder and its own private display:
+ *
+ *   -> CHANNEL_OPEN_REQUEST   <- CHANNEL_OPEN_RESPONSE
+ *   -> Setup { H.264 }        <- Config { status, max_unacked, configuration_indices }
+ *   -> VideoFocusRequest      <- VideoFocusNotification { projected }
+ *   -> Start, CodecConfig, Data...   <- Ack
+ *
+ * No touch: a cluster has none. Experimental, behind [car.CarSettings.clusterVideoEnabled], and
+ * untested in a car: none in the notes has a cluster sink.
+ */
+internal class ClusterVideo(
+    private val context: Context,
+    private val service: ServiceDiscovery.VideoService,
+    private val send: (messageId: Int, body: ByteArray) -> Unit,
+) {
+    private val log = GearslipLog.tagged("CLUSTER")
+    private val main = Handler(Looper.getMainLooper())
+
+    val channelId get() = service.serviceId
+
+    private var configIndex = 0
+    @Volatile private var started = false
+    @Volatile private var running = true
+    @Volatile private var source: VideoSource? = null
+    private var projector: ScreenProjector? = null
+
+    private val ackLock = Object()
+    @Volatile private var inFlight = 0
+    @Volatile private var maxUnacked = 1
+    @Volatile private var lastAckAt = 0L
+    private var frames = 0
+
+    fun onMessage(messageId: Int, body: ByteArray) {
+        when (messageId) {
+            GearslipRunner.MSG_CHANNEL_OPEN_RESPONSE -> {
+                val status = Protobuf.readInt32Field(body, 1) ?: 0
+                log.i("<- ChannelOpenResponse: status=$status")
+                if (status != 0) return
+                send(GearslipRunner.MSG_MEDIA_SETUP, Protobuf.varintField(1, GearslipRunner.CODEC_H264_BP.toLong()))
+                log.i("-> Setup(codec=VIDEO_H264_BP)")
+            }
+
+            GearslipRunner.MSG_MEDIA_CONFIG -> {
+                val fields = Wire.fields(body)
+                Wire.varint(fields, 2)?.toInt()?.let { maxUnacked = maxOf(1, it) }
+                val offered = fields.filter { it.number == 3 && it.wireType == 0 }.map { it.varint.toInt() }
+                // The cluster gets the smallest picture it offers: a turn card needs no more.
+                configIndex = offered.minByOrNull { service.configs.getOrNull(it)?.pixelCount() ?: Int.MAX_VALUE } ?: 0
+                log.i("<- Config status=${Wire.varint(fields, 1)} max_unacked=$maxUnacked offered=$offered - using $configIndex")
+                val focus = Protobuf.varintField(2, GearslipRunner.VIDEO_FOCUS_PROJECTED.toLong()) + Protobuf.varintField(3, 1L)
+                send(GearslipRunner.MSG_VIDEO_FOCUS_REQUEST, focus)
+                log.i("-> VideoFocusRequest(mode=PROJECTED)")
+            }
+
+            GearslipRunner.MSG_VIDEO_FOCUS_NOTIFICATION -> {
+                val mode = Wire.varint(Wire.fields(body), 1)?.toInt() ?: GearslipRunner.VIDEO_FOCUS_PROJECTED
+                log.i("<- VideoFocusNotification: mode=$mode")
+                val projected = mode == GearslipRunner.VIDEO_FOCUS_PROJECTED || mode == GearslipRunner.VIDEO_FOCUS_PROJECTED_NO_INPUT
+                if (projected && !started) startStream()
+            }
+
+            GearslipRunner.MSG_MEDIA_ACK -> {
+                val acked = Wire.varint(Wire.fields(body), 2)?.toInt() ?: 1
+                synchronized(ackLock) {
+                    inFlight = maxOf(0, inFlight - maxOf(1, acked))
+                    lastAckAt = System.currentTimeMillis()
+                    ackLock.notifyAll()
+                }
+            }
+
+            else -> log.i("<- unhandled message id=$messageId (${body.size} bytes)")
+        }
+    }
+
+    private fun startStream() {
+        val config = service.configs.getOrNull(configIndex) ?: service.configs.firstOrNull() ?: return
+        val (width, height) = config.pixelSize() ?: run {
+            log.w("unsupported cluster resolution ${config.resolutionName}")
+            return
+        }
+        started = true
+        send(
+            GearslipRunner.MSG_MEDIA_START,
+            Protobuf.varintField(1, GearslipRunner.SESSION_ID.toLong()) + Protobuf.varintField(2, configIndex.toLong()),
+        )
+        log.i("-> Start(config=$configIndex -> $config)")
+        lastAckAt = System.currentTimeMillis()
+        val video = VideoSource(
+            width = width,
+            height = height,
+            frameRate = FRAME_RATE,
+            mode = VideoSource.Mode.SURFACE,
+            wireless = true, // a small share of the link: the main screen comes first
+            onCodecConfig = { csd ->
+                send(GearslipRunner.MSG_MEDIA_CODEC_CONFIG, csd)
+                log.i("-> CodecConfig (${csd.size} bytes)")
+            },
+            onFrame = { data, pts, _ -> sendFrame(data, pts) },
+        )
+        source = video
+        runCatching { video.start() }.onFailure {
+            log.e("cluster encoder failed to start", it)
+            return
+        }
+        val surface = video.inputSurface ?: return
+        val density = config.density.takeIf { it > 0 } ?: 160
+        main.post {
+            if (!running) return@post
+            projector = ScreenProjector(context).also {
+                it.start(surface, width, height, density, name = "gearslip-cluster") {
+                    // The margins the car crops off are kept clear, as on the main screen.
+                    ClusterScreen(config.widthMargin, config.heightMargin)
+                }
+            }
+        }
+    }
+
+    /** As on the main screen: wait for the car's acks rather than drop a frame. */
+    private fun sendFrame(data: ByteArray, presentationTimeUs: Long) {
+        synchronized(ackLock) {
+            while (running && inFlight >= maxUnacked) {
+                val since = System.currentTimeMillis() - lastAckAt
+                if (since > GearslipRunner.ACK_STALL_MS) {
+                    inFlight = 0
+                    lastAckAt = System.currentTimeMillis()
+                    break
+                }
+                ackLock.wait(GearslipRunner.ACK_STALL_MS - since + 1)
+            }
+        }
+        if (!running) return
+        val timestamp = ByteArray(8)
+        for (i in 0 until 8) timestamp[i] = ((presentationTimeUs shr ((7 - i) * 8)) and 0xFF).toByte()
+        synchronized(ackLock) { inFlight++ }
+        runCatching { send(GearslipRunner.MSG_MEDIA_DATA, timestamp + data) }.onFailure { running = false }
+        if (++frames <= 2) log.i("-> Data frame #$frames (${data.size} bytes)")
+    }
+
+    fun stop() {
+        running = false
+        synchronized(ackLock) { ackLock.notifyAll() }
+        main.post {
+            projector?.stop()
+            projector = null
+        }
+        source?.stop()
+        source = null
+    }
+
+    private companion object {
+        // A turn card changes a few times a minute; the encoder repeats the last frame between.
+        const val FRAME_RATE = 15
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/FrameStretcher.kt

@@ -0,0 +1,190 @@
+package app.seb3thehacker.gearslip
+
+import android.graphics.SurfaceTexture
+import android.opengl.EGL14
+import android.opengl.EGLConfig
+import android.opengl.EGLContext
+import android.opengl.EGLDisplay
+import android.opengl.EGLExt
+import android.opengl.EGLSurface
+import android.opengl.GLES11Ext
+import android.opengl.GLES20
+import android.os.Handler
+import android.os.HandlerThread
+import android.view.Surface
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
+
+/**
+ * Stretches a [width] x [height] picture over the whole of an [outWidth] x [outHeight] encoder
+ * frame.
+ *
+ * For a head unit that squashes the frame onto a screen of another shape: Gearslip draws for the
+ * screen's real shape into [input], this stretches it the other way, and the car's squash brings
+ * it back. It works on the composited picture, so a map app's own surface is stretched with
+ * everything else - scaling Gearslip's UI alone would leave the map squashed.
+ */
+class FrameStretcher(
+    private val output: Surface,
+    val width: Int,
+    val height: Int,
+    private val outWidth: Int,
+    private val outHeight: Int,
+) {
+
+    private val thread = HandlerThread("gearslip-stretch").apply { start() }
+    private val handler = Handler(thread.looper)
+
+    private var display: EGLDisplay = EGL14.EGL_NO_DISPLAY
+    private var context: EGLContext = EGL14.EGL_NO_CONTEXT
+    private var eglSurface: EGLSurface = EGL14.EGL_NO_SURFACE
+    private var program = 0
+    private var texture: SurfaceTexture? = null
+    private val transform = FloatArray(16)
+
+    /** Where to draw. Valid once [start] returns true. */
+    lateinit var input: Surface
+        private set
+
+    /** Sets up on its own thread and waits for it; false if the GPU wouldn't play along. */
+    fun start(): Boolean {
+        val done = CountDownLatch(1)
+        var ok = false
+        handler.post {
+            ok = runCatching { setUp() }
+                .onFailure { GearslipLog.e("stretch: could not set up", it) }
+                .isSuccess
+            done.countDown()
+        }
+        done.await(2, TimeUnit.SECONDS)
+        if (!ok) release()
+        return ok
+    }
+
+    fun release() {
+        handler.post {
+            runCatching { if (::input.isInitialized) input.release() }
+            runCatching { texture?.release() }
+            texture = null
+            if (display != EGL14.EGL_NO_DISPLAY) {
+                EGL14.eglMakeCurrent(display, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT)
+                if (eglSurface != EGL14.EGL_NO_SURFACE) EGL14.eglDestroySurface(display, eglSurface)
+                if (context != EGL14.EGL_NO_CONTEXT) EGL14.eglDestroyContext(display, context)
+                EGL14.eglTerminate(display)
+            }
+            display = EGL14.EGL_NO_DISPLAY
+            thread.quitSafely()
+        }
+    }
+
+    private fun setUp() {
+        display = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY)
+        val version = IntArray(2)
+        check(EGL14.eglInitialize(display, version, 0, version, 1)) { "eglInitialize failed" }
+        val configs = arrayOfNulls<EGLConfig>(1)
+        val count = IntArray(1)
+        val attributes = intArrayOf(
+            EGL14.EGL_RED_SIZE, 8, EGL14.EGL_GREEN_SIZE, 8, EGL14.EGL_BLUE_SIZE, 8,
+            EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
+            EGL_RECORDABLE_ANDROID, 1,
+            EGL14.EGL_NONE,
+        )
+        check(EGL14.eglChooseConfig(display, attributes, 0, configs, 0, 1, count, 0) && count[0] > 0) {
+            "no EGL config"
+        }
+        context = EGL14.eglCreateContext(
+            display, configs[0], EGL14.EGL_NO_CONTEXT,
+            intArrayOf(EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE), 0,
+        )
+        eglSurface = EGL14.eglCreateWindowSurface(display, configs[0], output, intArrayOf(EGL14.EGL_NONE), 0)
+        check(EGL14.eglMakeCurrent(display, eglSurface, eglSurface, context)) { "eglMakeCurrent failed" }
+
+        program = link(VERTEX, FRAGMENT)
+        val ids = IntArray(1)
+        GLES20.glGenTextures(1, ids, 0)
+        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, ids[0])
+        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR)
+        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR)
+        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE)
+        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE)
+
+        texture = SurfaceTexture(ids[0]).apply {
+            setDefaultBufferSize(width, height)
+            setOnFrameAvailableListener({ draw() }, handler)
+        }
+        input = Surface(texture)
+        GearslipLog.i("stretch: drawing ${width}x$height, stretched to fill ${outWidth}x$outHeight")
+    }
+
+    private fun draw() {
+        val tex = texture ?: return
+        runCatching {
+            tex.updateTexImage()
+            tex.getTransformMatrix(transform)
+            GLES20.glViewport(0, 0, outWidth, outHeight)
+            GLES20.glUseProgram(program)
+            val position = GLES20.glGetAttribLocation(program, "aPosition")
+            val coord = GLES20.glGetAttribLocation(program, "aCoord")
+            GLES20.glEnableVertexAttribArray(position)
+            GLES20.glVertexAttribPointer(position, 2, GLES20.GL_FLOAT, false, 0, QUAD)
+            GLES20.glEnableVertexAttribArray(coord)
+            GLES20.glVertexAttribPointer(coord, 2, GLES20.GL_FLOAT, false, 0, COORDS)
+            GLES20.glUniformMatrix4fv(GLES20.glGetUniformLocation(program, "uTransform"), 1, false, transform, 0)
+            GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4)
+            EGLExt.eglPresentationTimeANDROID(display, eglSurface, tex.timestamp)
+            EGL14.eglSwapBuffers(display, eglSurface)
+        }.onFailure { GearslipLog.e("stretch: draw failed", it) }
+    }
+
+    private fun link(vertex: String, fragment: String): Int {
+        fun compile(type: Int, source: String): Int = GLES20.glCreateShader(type).also {
+            GLES20.glShaderSource(it, source)
+            GLES20.glCompileShader(it)
+            val status = IntArray(1)
+            GLES20.glGetShaderiv(it, GLES20.GL_COMPILE_STATUS, status, 0)
+            check(status[0] != 0) { "shader: ${GLES20.glGetShaderInfoLog(it)}" }
+        }
+        return GLES20.glCreateProgram().also {
+            GLES20.glAttachShader(it, compile(GLES20.GL_VERTEX_SHADER, vertex))
+            GLES20.glAttachShader(it, compile(GLES20.GL_FRAGMENT_SHADER, fragment))
+            GLES20.glLinkProgram(it)
+            val status = IntArray(1)
+            GLES20.glGetProgramiv(it, GLES20.GL_LINK_STATUS, status, 0)
+            check(status[0] != 0) { "program: ${GLES20.glGetProgramInfoLog(it)}" }
+        }
+    }
+
+    private companion object {
+        /** EGL_RECORDABLE_ANDROID: the config must be able to feed a video encoder. */
+        const val EGL_RECORDABLE_ANDROID = 0x3142
+
+        val QUAD = floats(-1f, -1f, 1f, -1f, -1f, 1f, 1f, 1f)
+        val COORDS = floats(0f, 0f, 1f, 0f, 0f, 1f, 1f, 1f)
+
+        fun floats(vararg values: Float) = ByteBuffer.allocateDirect(values.size * 4)
+            .order(ByteOrder.nativeOrder()).asFloatBuffer().apply { put(values); position(0) }
+
+        const val VERTEX = """
+            attribute vec4 aPosition;
+            attribute vec4 aCoord;
+            uniform mat4 uTransform;
+            varying vec2 vCoord;
+            void main() {
+                gl_Position = aPosition;
+                vCoord = (uTransform * aCoord).xy;
+            }
+        """
+
+        const val FRAGMENT = """
+            #extension GL_OES_EGL_image_external : require
+            precision mediump float;
+            varying vec2 vCoord;
+            uniform samplerExternalOES sTexture;
+            void main() {
+                gl_FragColor = texture2D(sTexture, vCoord);
+            }
+        """
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/Framing.kt

@@ -1,20 +1,10 @@
 package app.seb3thehacker.gearslip
 
 import java.io.ByteArrayOutputStream
+import java.io.IOException
+import java.io.OutputStream
 
-/**
- * Android Auto frame layout, transcribed from aasdk.
- *
- * FrameHeader::getData (src/Messenger/FrameHeader.cpp:47-55),
- * FrameSize::getData (src/Messenger/FrameSize.cpp:49-62) and
- * MessageOutStream::compoundFrame (src/Messenger/MessageOutStream.cpp:100-120):
- *
- *   byte 0     channel id
- *   byte 1     frameType | encryption | messageType
- *   bytes 2-3  uint16 BE  payload length of THIS frame
- *   bytes 4-7  uint32 BE  total message length - present ONLY when frameType == FIRST
- *   payload    uint16 BE message id, then the body
- */
+/** Android Auto framing with plaintext fragmentation before per-frame encryption. */
 object Frames {
 
     const val CHANNEL_CONTROL = 0
@@ -36,8 +26,11 @@ object Frames {
     const val MESSAGE_SPECIFIC = 0
     const val MESSAGE_CONTROL = 1 shl 2
 
-    /** aasdk splits at this size (MessageOutStream.hpp:62). Nothing the spike sends is close. */
-    const val MAX_FRAME_PAYLOAD = 0x4000
+    // Android Auto's default fragment budget includes the framing header. TLS adds overhead.
+    private const val FRAGMENT_SIZE = 0x3f00
+    private const val HEADER_SIZE = 4
+    private const val FIRST_HEADER_SIZE = 8
+    const val MAX_FRAME_PAYLOAD = FRAGMENT_SIZE - HEADER_SIZE
 
     class Frame(
         val channel: Int,
@@ -45,6 +38,7 @@ object Frames {
         val encrypted: Boolean,
         val messageType: Int,
         val payload: ByteArray,
+        val totalSize: Int? = null,
     )
 
     /**
@@ -60,6 +54,11 @@ object Frames {
         frameType: Int = TYPE_BULK,
         totalSize: Int? = null,
     ): ByteArray {
+        require(channel in 0..255 && payload.size <= 0xffff)
+        require(frameType in TYPE_MIDDLE..TYPE_BULK)
+        require(messageType == MESSAGE_SPECIFIC || messageType == MESSAGE_CONTROL)
+        require((frameType == TYPE_FIRST) == (totalSize != null))
+        require(totalSize == null || totalSize in 2..MAX_MESSAGE_SIZE)
         val flags = frameType or messageType or (if (encrypted) ENCRYPTED else 0)
         val header = byteArrayOf(
             channel.toByte(),
@@ -67,7 +66,7 @@ object Frames {
             ((payload.size shr 8) and 0xFF).toByte(),
             (payload.size and 0xFF).toByte(),
         )
-        if (frameType != TYPE_FIRST || totalSize == null) return header + payload
+        if (totalSize == null) return header + payload
         val extended = byteArrayOf(
             ((totalSize shr 24) and 0xFF).toByte(),
             ((totalSize shr 16) and 0xFF).toByte(),
@@ -77,6 +76,43 @@ object Frames {
         return header + extended + payload
     }
 
+    /** Splits plaintext before encryption; FIRST carries the complete plaintext length. */
+    fun writeMessage(
+        output: OutputStream,
+        channel: Int,
+        encrypted: Boolean,
+        messageType: Int,
+        message: ByteArray,
+        encrypt: (ByteArray) -> ByteArray,
+    ): Int {
+        require(message.size in 2..MAX_MESSAGE_SIZE)
+        val fragmented = message.size > FRAGMENT_SIZE - HEADER_SIZE
+        require(messageType != MESSAGE_CONTROL || !fragmented) { "Channel control messages cannot be fragmented" }
+        var offset = 0
+        var frames = 0
+        while (offset < message.size) {
+            val first = fragmented && offset == 0
+            val headerSize = if (first) FIRST_HEADER_SIZE else HEADER_SIZE
+            val end = minOf(offset + FRAGMENT_SIZE - headerSize, message.size)
+            val type = when {
+                !fragmented -> TYPE_BULK
+                first -> TYPE_FIRST
+                end == message.size -> TYPE_LAST
+                else -> TYPE_MIDDLE
+            }
+            val chunk = message.copyOfRange(offset, end)
+            output.write(build(channel, encrypted, if (encrypted) encrypt(chunk) else chunk,
+                messageType, type, if (type == TYPE_FIRST) message.size else null))
+            offset = end
+            frames++
+        }
+        return frames
+    }
+
+    // Local resource limits, not protocol constants. No supported media packet needs more.
+    private const val MAX_MESSAGE_SIZE = 16 * 1024 * 1024
+    private const val MAX_BUFFERED_SIZE = 32 * 1024 * 1024
+
     /**
      * Pulls whole frames out of an accumulating buffer.
      *
@@ -87,6 +123,8 @@ object Frames {
         private var pending = ByteArray(0)
 
         fun append(data: ByteArray, length: Int) {
+            require(length in 0..data.size)
+            if (length > MAX_BUFFERED_SIZE - pending.size) throw IOException("Frame buffer limit exceeded")
             val grown = ByteArray(pending.size + length)
             System.arraycopy(pending, 0, grown, 0, pending.size)
             System.arraycopy(data, 0, grown, pending.size, length)
@@ -106,30 +144,53 @@ object Frames {
             val total = headerLength + frameSize
             if (pending.size < total) return null
 
+            val messageSize = if (frameType == TYPE_FIRST) {
+                var size = 0L
+                for (i in 4..7) size = (size shl 8) or (pending[i].toLong() and 0xff)
+                if (size !in 2..MAX_MESSAGE_SIZE.toLong()) throw IOException("Invalid fragmented message length: $size")
+                size.toInt()
+            } else null
             val payload = pending.copyOfRange(headerLength, total)
             pending = pending.copyOfRange(total, pending.size)
             return Frame(
-                channel, frameType, (flags and ENCRYPTED) != 0, flags and MESSAGE_CONTROL, payload,
+                channel, frameType, (flags and ENCRYPTED) != 0, flags and MESSAGE_CONTROL, payload, messageSize,
             )
         }
     }
 
-    /** Rejoins FIRST/MIDDLE/LAST runs. Payloads arrive already decrypted. */
+    /** Rejoins messages on independent channels, validating their plaintext length and flags. */
     class Assembler {
-        private val partial = HashMap<Int, ByteArrayOutputStream>()
+        private class Partial(val first: Frame, val data: ByteArrayOutputStream = ByteArrayOutputStream())
+        private val partial = HashMap<Int, Partial>()
+        private var buffered = 0
 
-        fun offer(frame: Frame, payload: ByteArray): ByteArray? = when (frame.frameType) {
-            TYPE_BULK -> payload
-            TYPE_FIRST -> {
-                partial[frame.channel] = ByteArrayOutputStream().apply { write(payload) }
-                null
+        fun offer(frame: Frame, payload: ByteArray): ByteArray? {
+            if (frame.frameType == TYPE_BULK) {
+                if (partial.containsKey(frame.channel)) fail("Complete message interrupted fragments")
+                return payload
             }
-            TYPE_MIDDLE -> {
-                partial[frame.channel]?.write(payload)
-                null
-            }
-            TYPE_LAST -> partial.remove(frame.channel)?.apply { write(payload) }?.toByteArray()
-            else -> null
+            val message = if (frame.frameType == TYPE_FIRST) {
+                if (frame.totalSize == null || partial.containsKey(frame.channel)) fail("Invalid first fragment")
+                Partial(frame).also { partial[frame.channel] = it }
+            } else partial[frame.channel] ?: fail("Fragment without a first frame")
+            val first = message.first
+            if (first.encrypted != frame.encrypted || first.messageType != frame.messageType) fail("Fragment flags changed")
+            val expected = first.totalSize ?: fail("Missing total size")
+            if (expected !in 2..MAX_MESSAGE_SIZE || payload.size > expected - message.data.size()) fail("Fragment exceeds message length")
+            if (payload.size > MAX_BUFFERED_SIZE - buffered) fail("Fragment buffer limit exceeded")
+            message.data.write(payload)
+            buffered += payload.size
+            if (frame.frameType != TYPE_LAST) return null
+            if (message.data.size() != expected) fail("Truncated fragmented message")
+            partial.remove(frame.channel)
+            buffered -= message.data.size()
+            return message.data.toByteArray()
+        }
+
+        private fun fail(message: String): Nothing {
+            partial.clear()
+            buffered = 0
+            throw IOException(message)
         }
     }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/GearslipActivity.kt

@@ -14,7 +14,6 @@ import android.os.ParcelFileDescriptor
 import android.provider.Settings
 import android.view.MotionEvent
 import android.view.Surface
-import android.view.WindowManager
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.compose.runtime.collectAsState
@@ -117,6 +116,21 @@ class GearslipActivity : ComponentActivity(), Projection {
         }
     }
 
+    /** Android's one-time "Allow" for a car to connect by itself; see [WirelessAuto]. */
+    private var approvingCar: String? = null
+
+    /** Whether the phone showed Gearslip when the car's intent arrived; see [stepAside]. */
+    private var shownOnPhone = false
+    private var stepAsideOnVideo = false
+    private val carApproval = registerForActivityResult(
+        androidx.activity.result.contract.ActivityResultContracts.StartIntentSenderForResult(),
+    ) { result ->
+        val address = approvingCar ?: return@registerForActivityResult
+        approvingCar = null
+        if (result.resultCode == RESULT_OK) app.seb3thehacker.gearslip.wireless.WirelessAuto.approved(this, address)
+        else app.seb3thehacker.gearslip.wireless.WirelessAuto.declined(this, address)
+    }
+
     /** Setting Gearslip as the phone's caller ID and spam app - what lets it decline a ringing call. */
     private val callScreeningRole = registerForActivityResult(StartActivityForResult()) { result ->
         if (result.resultCode != RESULT_OK) GearslipLog.w("calls: call screening role declined")
@@ -130,7 +144,6 @@ class GearslipActivity : ComponentActivity(), Projection {
         // is both a bad first impression and unreliable: Android does not consistently show more
         // than one system permission dialog fired back-to-back, which was silently dropping some.
         enableEdgeToEdge()
-        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
 
         GearslipLog.init(this)
         GearslipLog.installCrashHandler()
@@ -138,6 +151,12 @@ class GearslipActivity : ComponentActivity(), Projection {
         app.seb3thehacker.gearslip.wireless.WirelessLink.onConnected = { socket ->
             runOnUiThread { startWireless(socket) }
         }
+        app.seb3thehacker.gearslip.wireless.WirelessAuto.showApproval = { chooser, address ->
+            runOnUiThread {
+                approvingCar = address
+                carApproval.launch(androidx.activity.result.IntentSenderRequest.Builder(chooser).build())
+            }
+        }
         CarSettings.init(this)
         AppSettings.applyGearslipEnabled(this)
         // A capture that died without tidying up would leave notifications exposed to every
@@ -208,6 +227,16 @@ class GearslipActivity : ComponentActivity(), Projection {
         }
     }
 
+    override fun onResume() {
+        super.onResume()
+        shownOnPhone = true
+    }
+
+    override fun onStop() {
+        super.onStop()
+        shownOnPhone = false
+    }
+
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
         handleIntent(intent)
@@ -216,6 +245,7 @@ class GearslipActivity : ComponentActivity(), Projection {
     override fun onDestroy() {
         super.onDestroy()
         app.seb3thehacker.gearslip.wireless.WirelessLink.onConnected = null
+        app.seb3thehacker.gearslip.wireless.WirelessAuto.showApproval = null
         runCatching { unregisterReceiver(detachReceiver) }
         PhoneMirror.onStartRequested = null
         PhoneMirror.onTokenReady = null
@@ -280,7 +310,8 @@ class GearslipActivity : ComponentActivity(), Projection {
         val target = surface ?: return
         if (screenProjector != null) return
         val projector = ScreenProjector(this).also { screenProjector = it }
-        projector.start(target, frameWidth, frameHeight, frameDensity) { CarUi() }
+        // The frame's density, not frameDensity: that stays the car's own, for the phone mirror.
+        projector.start(target, frameWidth, frameHeight, CarEnvironment.frame.value.densityDpi) { CarUi() }
     }
 
     /**
@@ -304,6 +335,13 @@ class GearslipActivity : ComponentActivity(), Projection {
     }
 
     private fun handleIntent(intent: Intent?) {
+        // Debug builds only: opens the audio choice for a look, without turning down a real prompt.
+        if (BuildConfig.DEBUG && intent?.getBooleanExtra("show_audio_choice", false) == true) offerBluetooth.value = true
+        if (intent?.action == app.seb3thehacker.gearslip.wireless.WirelessAuto.ACTION_CAR_NEARBY) {
+            stepAsideOnVideo = !shownOnPhone
+            connectToNearbyCar(intent.getStringExtra(app.seb3thehacker.gearslip.wireless.WirelessAuto.EXTRA_ADDRESS))
+            return
+        }
         if (intent?.action != UsbManager.ACTION_USB_ACCESSORY_ATTACHED) return
         // Switched off in Settings: the system shouldn't route the car here at all, but if it
         // does, leave the accessory alone.
@@ -318,9 +356,43 @@ class GearslipActivity : ComponentActivity(), Projection {
             return
         }
         GearslipLog.i("accessory attached by the system - permission is implicit on this path")
+        stepAsideOnVideo = !shownOnPhone
         start(accessory)
     }
 
+    /** A known car came up over Bluetooth: connect wirelessly, unless USB or another try is already on it. */
+    private fun connectToNearbyCar(address: String?) {
+        if (address == null) return
+        if (!AppSettings.gearslipEnabled(this)) {
+            GearslipLog.i("auto-connect: Gearslip is switched off - not connecting")
+            return
+        }
+        if (descriptor != null) {
+            GearslipLog.i("auto-connect: the car is on USB already - staying on USB")
+            return
+        }
+        // Only a session that's still running counts. One the car ended (a ByeBye, a dropped
+        // network) leaves its runner behind, since only Gearslip ending a session clears it, and
+        // that used to make every later auto-connect quietly do nothing.
+        if (worker?.isAlive == true || app.seb3thehacker.gearslip.wireless.WirelessLink.busy) {
+            GearslipLog.i("auto-connect: a session is already running")
+            return
+        }
+        if (runner != null) closeAccessory(stopWireless = false)
+        if (checkSelfPermission(android.Manifest.permission.BLUETOOTH_CONNECT) != android.content.pm.PackageManager.PERMISSION_GRANTED) {
+            GearslipLog.w("auto-connect: needs the Nearby devices permission")
+            return
+        }
+        val adapter = getSystemService(android.bluetooth.BluetoothManager::class.java)?.adapter
+        val device = adapter?.let { runCatching { it.getRemoteDevice(address) }.getOrNull() }
+        if (device == null) {
+            GearslipLog.w("auto-connect: Bluetooth couldn't hand over the car")
+            return
+        }
+        GearslipLog.i("auto-connect: connecting")
+        app.seb3thehacker.gearslip.wireless.WirelessLink.start(this, device)
+    }
+
     private fun start(accessory: UsbAccessory) {
         // A fresh ATTACHED intent means the system wants a new session, whatever state the old
         // one is in - closing first guarantees openAccessory() below never fights a descriptor
@@ -346,9 +418,11 @@ class GearslipActivity : ComponentActivity(), Projection {
             identityProvider = { CertProvider.load(this) },
             projection = this,
             vehicleProfileFor = { info -> VehicleProfiles.find(VehicleProfiles.load(this), info) },
+            phoneIcons = { PhoneIcons.pngs(this) },
         )
         this.runner = runner
         worker = Thread { runner.run() }.apply { name = "gearslip"; start() }
+        holdLocation()
     }
 
     /** A wireless session: the same runner, on the socket [WirelessLink] opened to the car. */
@@ -368,9 +442,25 @@ class GearslipActivity : ComponentActivity(), Projection {
             projection = this,
             vehicleProfileFor = { info -> VehicleProfiles.find(VehicleProfiles.load(this), info) },
             wireless = true,
+            phoneIcons = { PhoneIcons.pngs(this) },
         )
         this.runner = runner
         worker = Thread { runner.run() }.apply { name = "gearslip"; start() }
+        holdLocation()
+    }
+
+    /** Whether this session holds [app.seb3thehacker.gearslip.host.LocationKeepAlive]. */
+    private var holdingLocation = false
+
+    /**
+     * Android lets a foreground service started from the background use location only in the few
+     * seconds after one of the app's screens opens. The car just opened this one, so take the
+     * location service now: a map bound later, with the phone already locked, got no position.
+     */
+    private fun holdLocation() {
+        if (holdingLocation) return
+        holdingLocation = true
+        app.seb3thehacker.gearslip.host.LocationKeepAlive.acquire(this) {}
     }
 
     private fun describe(accessory: UsbAccessory) {
@@ -390,10 +480,27 @@ class GearslipActivity : ComponentActivity(), Projection {
         wirelessSocket = null
         if (stopWireless) app.seb3thehacker.gearslip.wireless.WirelessLink.stop(this)
         runner = null
+        if (holdingLocation) {
+            holdingLocation = false
+            app.seb3thehacker.gearslip.host.LocationKeepAlive.release(this)
+        }
     }
 
     // --- Projection ---------------------------------------------------------------------
 
+    /**
+     * The car opens Gearslip on the phone, since Android hands a USB car only to an activity and
+     * auto-connect has to start one too. Once the car's screen is up, go back to whatever the
+     * phone showed, as Home would; the session carries on as it does with the phone locked. A
+     * question for the driver keeps Gearslip in front, and so does the phone already showing it.
+     */
+    private fun stepAside() {
+        stepAsideOnVideo = false
+        if (offerBluetooth.value || micBlockedNotice.value || approvingCar != null) return
+        GearslipLog.i("the car's screen is up - moving Gearslip off the phone's screen")
+        moveTaskToBack(true)
+    }
+
     override fun onSurfaceReady(surface: Surface, width: Int, height: Int, densityDpi: Int) {
         runOnUiThread {
             this.surface = surface
@@ -403,6 +510,7 @@ class GearslipActivity : ComponentActivity(), Projection {
             CarEnvironment.setDisplay(width, height, densityDpi)
             CarEnvironment.start(this)
             showCarUi()
+            if (stepAsideOnVideo) stepAside()
             app.seb3thehacker.gearslip.car.CarKeys.focusSink = { code, down ->
                 runOnUiThread { screenProjector?.dispatchKey(code, down) }
             }
@@ -419,6 +527,10 @@ class GearslipActivity : ComponentActivity(), Projection {
         }
     }
 
+    override fun onStill() {
+        screenProjector?.redraw()
+    }
+
     override fun onProjectionStopped() {
         // Before the car UI goes, while the media connection is still up.
         app.seb3thehacker.gearslip.car.CarServices.pausePhoneMedia()

gearslip/src/main/java/app/seb3thehacker/gearslip/GearslipLog.kt

@@ -47,11 +47,109 @@ object GearslipLog {
     val version: StateFlow<Int> = liveVersion
 
     fun init(context: Context) {
+        // The phone app and the launcher both start here; one file per process.
+        if (file != null) return
         val dir = context.getExternalFilesDir(null) ?: return
         val name = SimpleDateFormat("yyyyMMdd-HHmmss", Locale.US).format(Date())
         file = File(dir, "gearslip-$name.log")
         i("log file: ${file?.absolutePath}")
         SessionReport.init(context)
+        // One file per launch adds up; the newest are the ones anyone asks for.
+        io.execute { logFiles(dir).drop(KEEP_FILES).forEach { it.delete() } }
+        lastExit(context, dir)
+    }
+
+    private const val KEEP_FILES = 30
+    private const val KEY_EXIT_SEEN = "log_exit_seen"
+
+    /**
+     * Why Android ended the last run, when the crash handler can't have seen it: a native crash,
+     * a freeze (ANR), or the memory killer. Written here and onto the end of that run's own log,
+     * which is the one a driver shares after a drive that went wrong.
+     */
+    private fun lastExit(context: Context, dir: File) {
+        val am = context.getSystemService(android.app.ActivityManager::class.java) ?: return
+        val seen = AppSettings.getString(context, KEY_EXIT_SEEN, "0").toLongOrNull() ?: 0L
+        val exits = runCatching { am.getHistoricalProcessExitReasons(null, 0, 5) }.getOrDefault(emptyList())
+            .filter { it.timestamp > seen }
+        exits.firstOrNull()?.let { AppSettings.putString(context, KEY_EXIT_SEEN, it.timestamp.toString()) }
+        val parse = SimpleDateFormat("yyyyMMdd-HHmmss", Locale.US)
+        for (exit in exits.reversed()) {
+            val why = EXIT_REASONS[exit.reason] ?: continue
+            val at = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US).format(Date(exit.timestamp))
+            val detail = buildString {
+                append("$at, $why")
+                exit.description?.takeIf { it.isNotBlank() }?.let { append(" ($it)") }
+                append(", memory ${exit.pss / 1024} MB")
+                if (exit.reason == android.app.ApplicationExitInfo.REASON_ANR) {
+                    anrMainThread(exit)?.let { append("\n").append(it) }
+                }
+            }
+            w("Android ended an earlier run at $detail")
+            // The run that died: the newest log that started before it ended.
+            val run = logFiles(dir).filter { it != file }.firstOrNull { f ->
+                val started = runCatching { parse.parse(f.name.removePrefix("gearslip-").removeSuffix(".log")) }.getOrNull()
+                started != null && started.time <= exit.timestamp
+            } ?: continue
+            io.execute { runCatching { run.appendText("--- $EXIT_MARK $detail\n") } }
+        }
+    }
+
+    /** The main thread's stack from an ANR trace: what Gearslip was stuck doing. */
+    private fun anrMainThread(exit: android.app.ApplicationExitInfo): String? = runCatching {
+        exit.traceInputStream?.bufferedReader()?.useLines { lines ->
+            lines.dropWhile { !it.startsWith("\"main\"") }.take(ANR_LINES).joinToString("\n")
+        }?.takeIf { it.isNotBlank() }
+    }.getOrNull()
+
+    private const val ANR_LINES = 25
+    private const val EXIT_MARK = "Android ended this run:"
+
+    /** Exit reasons worth a line; leaving, updating and Java crashes (already logged) aren't. */
+    private val EXIT_REASONS = mapOf(
+        android.app.ApplicationExitInfo.REASON_CRASH_NATIVE to "a native crash",
+        android.app.ApplicationExitInfo.REASON_ANR to "the app stopped responding (ANR)",
+        android.app.ApplicationExitInfo.REASON_LOW_MEMORY to "the phone ran low on memory",
+        android.app.ApplicationExitInfo.REASON_EXCESSIVE_RESOURCE_USAGE to "it used too much of the phone's resources",
+        android.app.ApplicationExitInfo.REASON_INITIALIZATION_FAILURE to "it failed to start",
+        android.app.ApplicationExitInfo.REASON_SIGNALED to "the system killed it",
+        android.app.ApplicationExitInfo.REASON_DEPENDENCY_DIED to "something it depends on died",
+    )
+
+    private fun logFiles(dir: File): List<File> =
+        dir.listFiles { f -> f.isFile && f.name.startsWith("gearslip-") && f.name.endsWith(".log") }
+            ?.sortedByDescending { it.name }.orEmpty()
+
+    /** A log from an earlier launch: when it started, and what a glance at it tells. */
+    class PastLog(val file: File, val started: Date?, val crashed: Boolean, val car: String?)
+
+    /**
+     * Earlier launches' logs, newest first. Each launch starts a fresh file, so after a crash the
+     * one that saw it is here rather than on the live screen.
+     */
+    fun pastLogs(context: Context): List<PastLog> {
+        val dir = context.getExternalFilesDir(null) ?: return emptyList()
+        val parse = SimpleDateFormat("yyyyMMdd-HHmmss", Locale.US)
+        return logFiles(dir).filter { it != file }.map { f ->
+            val text = runCatching { f.readText() }.getOrDefault("")
+            PastLog(
+                file = f,
+                started = runCatching { parse.parse(f.name.removePrefix("gearslip-").removeSuffix(".log")) }.getOrNull(),
+                crashed = "FATAL uncaught" in text || EXIT_MARK in text,
+                car = Regex("""car="([^"]+)"""").findAll(text).lastOrNull()?.groupValues?.get(1),
+            )
+        }
+    }
+
+    /** An earlier launch's log, copied to the cache dir for sharing like [shareableFile]. */
+    fun shareableFile(context: Context, past: File): android.net.Uri {
+        val dir = File(context.cacheDir, "shared").apply { mkdirs() }
+        dir.listFiles()?.forEach { it.delete() }
+        val out = File(dir, "gearslip-log-${past.name.removePrefix("gearslip-").removeSuffix(".log")}.txt")
+        past.copyTo(out, overwrite = true)
+        return androidx.core.content.FileProvider.getUriForFile(
+            context, "${context.packageName}.logshare", out,
+        )
     }
 
     fun snapshot(): List<String> = synchronized(live) { live.toList() }
@@ -133,7 +231,11 @@ object GearslipLog {
      * Records an uncaught exception in the log file before the process dies, then lets the
      * system's own handler run. Without it the file ends mid-sentence and the reason is lost.
      */
+    @Volatile private var crashHandlerInstalled = false
+
     fun installCrashHandler() {
+        if (crashHandlerInstalled) return
+        crashHandlerInstalled = true
         val previous = Thread.getDefaultUncaughtExceptionHandler()
         Thread.setDefaultUncaughtExceptionHandler { thread, throwable ->
             runCatching {

gearslip/src/main/java/app/seb3thehacker/gearslip/GearslipRunner.kt

@@ -2,6 +2,7 @@ package app.seb3thehacker.gearslip
 
 import android.os.Build
 import app.seb3thehacker.gearslip.audio.AudioLink
+import app.seb3thehacker.gearslip.audio.CarAudio
 import app.seb3thehacker.gearslip.audio.CarMic
 import app.seb3thehacker.gearslip.media.CarMediaStatus
 import app.seb3thehacker.gearslip.car.BluetoothAudioCheck
@@ -12,12 +13,18 @@ import app.seb3thehacker.gearslip.car.DirectionsVoice
 import app.seb3thehacker.gearslip.car.CarAssistant
 import app.seb3thehacker.gearslip.car.CarEnvironment
 import app.seb3thehacker.gearslip.car.CarKeys
+import app.seb3thehacker.gearslip.car.ScreenFit
 import app.seb3thehacker.gearslip.car.CarSensors
 import app.seb3thehacker.gearslip.car.CarServices
 import app.seb3thehacker.gearslip.car.CarSettings
+import java.io.IOException
+import app.seb3thehacker.gearslip.protocol.InputProtocol
 import java.io.InputStream
 import java.io.OutputStream
+import java.util.concurrent.Executors
 import java.util.concurrent.FutureTask
+import java.util.concurrent.RejectedExecutionException
+import java.util.concurrent.TimeUnit
 
 /**
  * Drives the phone side of the control-channel handshake far enough to answer one question:
@@ -41,6 +48,8 @@ class GearslipRunner(
     private val vehicleProfileFor: (ServiceDiscovery.HeadUnitInfo) -> VehicleProfile? = { null },
     /** Over Wi-Fi rather than USB: the video is sent smaller so the link keeps up. */
     private val wireless: Boolean = false,
+    /** Gearslip's icon as 32, 64 and 128 px PNGs, for the car's phone tile. See [PhoneIcons]. */
+    private val phoneIcons: () -> List<ByteArray> = { emptyList() },
 ) {
     private val log = GearslipLog.tagged("PROTO")
 
@@ -49,6 +58,8 @@ class GearslipRunner(
     private val parser = Frames.Parser()
     private val assembler = Frames.Assembler()
     private lateinit var identityTask: FutureTask<PhoneTls>
+    /** The certificate in use, to tell a wrong date on the car from a certificate that's really out of date. */
+    @Volatile private var phoneCert: java.security.cert.X509Certificate? = null
 
     /** Sends every message, in order, so no other thread ever blocks on the USB link. See [send]. */
     private val writer = java.util.concurrent.Executors.newSingleThreadExecutor {
@@ -59,6 +70,7 @@ class GearslipRunner(
     /** Waits for the certificate only when TLS is first needed; see [run]. */
     private val tls: PhoneTls by lazy { identityTask.get() }
     private var authenticationFailed = false
+    private var drainWriterOnExit = false
     @Volatile private var stopped = false
 
     @Volatile private var state = State.WAIT_VERSION
@@ -71,6 +83,12 @@ class GearslipRunner(
     private var vehicleProfile: VehicleProfile? = null
     @Volatile private var videoStarted = false
     private var videoSource: VideoSource? = null
+
+    /** Between the car UI and the encoder when the car squashes the frame (see [screenShape]). */
+    private var stretcher: FrameStretcher? = null
+
+    /** What the car UI draws at when [stretcher] is on; touches are scaled into it. */
+    @Volatile private var drawSize: Pair<Int, Int>? = null
     @Volatile private var inFlight = 0
     /** Guards [inFlight]: the encoder thread waits on it for the head unit's acks. */
     private val ackLock = Object()
@@ -82,6 +100,8 @@ class GearslipRunner(
     @Volatile private var inputKeycodes: List<Int> = emptyList()
     @Volatile private var sensorChannelId: Int = -1
     @Volatile private var mediaStatus: CarMediaStatus? = null
+    @Volatile private var phoneStatus: app.seb3thehacker.gearslip.call.CarPhoneStatus? = null
+    @Volatile private var clusterVideo: ClusterVideo? = null
     @Volatile private var clusterNav: ClusterNav? = null
     private var sensorTypes: List<Int> = emptyList()
     @Volatile private var audioLink: AudioLink? = null
@@ -112,6 +132,7 @@ class GearslipRunner(
         identityTask = FutureTask {
             val identity = identityProvider()
             val cert = identity.certificate
+            phoneCert = cert
             log.i("phone certificate source: ${identity.source}")
             SessionReport.certificate(identity.source.toString(), cert.issuerX500Principal.toString())
             log.i("  subject = ${cert.subjectX500Principal}")
@@ -142,10 +163,13 @@ class GearslipRunner(
         } catch (t: Throwable) {
             if (stopped) return
             log.e("transport failed in state $state", t)
-            SessionReport.fail(SessionReport.Category.USB, "transport failed", t, state.name)
+            val link = if (wireless) SessionReport.Category.WIFI else SessionReport.Category.USB
+            SessionReport.fail(link, "transport failed", t, state.name)
             reportDisconnect()
         } finally {
             running = false
+            writer.shutdown()
+            if (drainWriterOnExit) writer.awaitTermination(2, TimeUnit.SECONDS)
             writer.shutdownNow()
             log.flush()
         }
@@ -160,17 +184,25 @@ class GearslipRunner(
         synchronized(ackLock) { ackLock.notifyAll() } // free an encoder waiting on an ack
         videoSource?.stop()
         videoSource = null
+        stretcher?.release()
+        stretcher = null
+        CarAudio.openSink = null
         audioLink?.close()
         audioLink = null
         guidanceLink?.close()
         guidanceLink = null
         CarSensors.clear()
+        app.seb3thehacker.gearslip.car.CarData.clear()
         CarMic.current = null
         CarBluetooth.onCarDisconnected()
         BluetoothAudioCheck.onCarDisconnected()
         LocationCheck.onCarDisconnected()
         mediaStatus?.stop()
         mediaStatus = null
+        phoneStatus?.stop()
+        phoneStatus = null
+        clusterVideo?.stop()
+        clusterVideo = null
         clusterNav?.stop()
         clusterNav = null
         lastSensorNight = null
@@ -181,7 +213,7 @@ class GearslipRunner(
 
     private fun handleFrame(frame: Frames.Frame) {
         // A rejected handshake cannot consume later messages as if authentication succeeded.
-        if (authenticationFailed || stopped) return
+        if (authenticationFailed || stopped || !running) return
         val payload = if (frame.encrypted) {
             if (!tls.handshakeComplete) {
                 log.w("encrypted frame arrived before the handshake finished - ignoring")
@@ -192,7 +224,10 @@ class GearslipRunner(
             frame.payload
         }
 
-        val message = assembler.offer(frame, payload) ?: return
+        val message = if (frame.messageType == Frames.MESSAGE_CONTROL) {
+            if (frame.frameType != Frames.TYPE_BULK) throw IOException("Fragmented channel control message")
+            payload
+        } else assembler.offer(frame, payload) ?: return
         if (message.size < 2) {
             log.w("runt message on channel ${frame.channel}")
             return
@@ -204,6 +239,7 @@ class GearslipRunner(
         lastProgress = System.currentTimeMillis()
 
         if (frame.channel != Frames.CHANNEL_CONTROL) {
+            if (state != State.DONE || !frame.encrypted) return
             if (frame.channel == videoChannelId) {
                 onVideoMessage(messageId, body)
             } else if (frame.channel == inputChannelId) {
@@ -214,6 +250,10 @@ class GearslipRunner(
                 clusterNav?.onMessage(messageId, body)
             } else if (frame.channel == mediaStatus?.channelId) {
                 mediaStatus?.onMessage(messageId, body)
+            } else if (frame.channel == phoneStatus?.channelId) {
+                phoneStatus?.onMessage(messageId, body)
+            } else if (frame.channel == clusterVideo?.channelId) {
+                clusterVideo?.onMessage(messageId, body)
             } else if (frame.channel == guidanceLink?.channelId) {
                 guidanceLink?.onMessage(messageId, body)
             } else if (frame.channel == CarBluetooth.channelId) {
@@ -239,6 +279,9 @@ class GearslipRunner(
             }
             return
         }
+        if (messageId !in setOf(MSG_VERSION_REQUEST, MSG_ENCAPSULATED_SSL, MSG_AUTH_COMPLETE,
+                MSG_BYEBYE_REQUEST, MSG_UNEXPECTED_MESSAGE, MSG_FRAMING_ERROR) &&
+            (!frame.encrypted || state != State.DONE && state != State.WAIT_SDR)) return
 
         when (messageId) {
             MSG_VERSION_REQUEST -> onVersionRequest(body)
@@ -246,12 +289,27 @@ class GearslipRunner(
             MSG_AUTH_COMPLETE -> onAuthComplete(body)
             MSG_SERVICE_DISCOVERY_RESPONSE -> onServiceDiscoveryResponse(body)
             MSG_PING_REQUEST -> onPingRequest(body)
+            MSG_PING_RESPONSE -> onPingResponse()
             MSG_BYEBYE_REQUEST -> onByeByeRequest(body)
-            AudioLink.MSG_FOCUS_RESPONSE -> audioLink?.onFocus(Protobuf.readInt32Field(body, 1) ?: 0)
+            MSG_UNEXPECTED_MESSAGE, MSG_FRAMING_ERROR -> onProtocolError(messageId)
+            AudioLink.MSG_FOCUS_RESPONSE -> {
+                // One answer for both sinks: it is the directions' while they wait on one.
+                val state = Protobuf.readInt32Field(body, 1) ?: 0
+                val guidance = guidanceLink
+                if (guidance != null && guidance.expectsFocusAnswer()) guidance.onFocus(state) else audioLink?.onFocus(state)
+            }
             else -> log.i("unhandled control message id=$messageId (${body.size} bytes) - continuing")
         }
     }
 
+    private fun onProtocolError(messageId: Int) {
+        val detail = if (messageId == MSG_FRAMING_ERROR) "framing error" else "unexpected message"
+        log.w("head unit terminated the protocol: $detail")
+        SessionReport.fail(SessionReport.Category.UNKNOWN, detail, state.name, "protocol $messageId")
+        SessionStatus.failed("Protocol error", "The head unit reported a $detail.")
+        running = false
+    }
+
     /**
      * The head unit asking to end the session. It drops USB a few seconds later whether or not
      * we answer, so the point here is the reason: an Audi MIB2+ sent this about a second after
@@ -265,16 +323,23 @@ class GearslipRunner(
             3 -> "NOT_SUPPORTED"
             4 -> "NOT_CURRENTLY_SUPPORTED"
             5 -> "PROBE_SUPPORTED"
+            6 -> "WIRELESS_PROJECTION_DISABLED"
+            7 -> "POWER_DOWN"
+            8 -> "USER_PROFILE_SWITCH"
             else -> "unknown"
         }
         log.w("<- ByeByeRequest: reason=$reason ($name) in state $state")
         log.hex("   byebye raw", body)
         SessionReport.fail(SessionReport.Category.BYEBYE, "ByeByeRequest reason=$reason ($name)", state.name, "bye $reason")
-        send(MSG_BYEBYE_RESPONSE, ByteArray(0), encrypted = true)
+        send(MSG_BYEBYE_RESPONSE, ByteArray(0), encrypted = state == State.WAIT_SDR || state == State.DONE)
         log.i("-> ByeByeResponse")
+        drainWriterOnExit = true
+        running = false
+        SessionStatus.disconnected()
     }
 
     private fun onVersionRequest(body: ByteArray) {
+        if (state != State.WAIT_VERSION) return
         if (body.size < 4) {
             log.w("VersionRequest too short (${body.size} bytes)")
             return
@@ -284,24 +349,16 @@ class GearslipRunner(
         log.i("<- VersionRequest: head unit speaks $major.$minor")
         SessionReport.protocolVersion(major, minor)
 
-        // Always 1.3, on purpose. Every car that accepts Gearslip was tested this way, 1.5 units
-        // included. Echoing the car's own version was tried too: a 4.3 unit rejected the
-        // certificate either way, so the version doesn't decide acceptance. The log says so, since
-        // a car offering 1.5 and getting 1.3 back looks like a bug to anyone reading it.
-        val claim = CLAIM_VERSION ?: (major to minor)
-        val response = byteArrayOf(
-            ((claim.first shr 8) and 0xFF).toByte(), (claim.first and 0xFF).toByte(),
-            ((claim.second shr 8) and 0xFF).toByte(), (claim.second and 0xFF).toByte(),
-            0, 0, // STATUS_SUCCESS
-        )
-        send(MSG_VERSION_RESPONSE, response, encrypted = false)
-        log.i(
-            "-> VersionResponse: ${claim.first}.${claim.second} status=0 (STATUS_SUCCESS)" +
-                if (CLAIM_VERSION != null && claim != (major to minor)) {
-                    " - intended: Gearslip always answers ${claim.first}.${claim.second}, which cars " +
-                        "offering $major.$minor accept too"
-                } else "",
-        )
+        val response = ProtocolVersion.respond(major, minor)
+        send(MSG_VERSION_RESPONSE, response.bytes, encrypted = false)
+        log.i("-> VersionResponse: ${response.major}.${response.minor}, supported=${response.supported}")
+        if (!response.supported) {
+            authenticationFailed = true
+            drainWriterOnExit = true
+            running = false
+            SessionStatus.failed("Unsupported protocol", "The head unit requested protocol $major.$minor.")
+            return
+        }
         state = State.TLS_HANDSHAKE
         SessionStatus.connecting("Securing the link")
         log.i("awaiting ClientHello - the head unit is the TLS client, we are the server")
@@ -318,17 +375,13 @@ class GearslipRunner(
             if (stopped) return
             log.e("TLS handshake threw", t)
             SessionReport.fail(SessionReport.Category.TLS, "handshake threw", t, state.name)
-            log.verdict(
-                "NOT VIABLE (TLS rejected)",
-                "The head unit aborted the TLS handshake. A bad_certificate / unknown_ca / " +
-                    "handshake_failure alert here means it validates the phone's certificate.",
-            )
             SessionStatus.failed(
-                "Head unit rejected the certificate",
-                "The head unit aborted the secure handshake. It validates the phone's certificate.",
+                "Secure connection failed",
+                "The secure handshake could not be completed. Check the session log for details.",
             )
             state = State.DONE
             authenticationFailed = true
+            running = false
             SessionReport.print()
             return
         }
@@ -345,7 +398,7 @@ class GearslipRunner(
 
     private fun onAuthComplete(body: ByteArray) {
         val status = Protobuf.readInt32Field(body, 1)
-        if (state != State.WAIT_AUTH && !(state == State.TLS_HANDSHAKE && status in listOf(-2, -3))) return
+        if (state != State.WAIT_AUTH && !(state == State.TLS_HANDSHAKE && status != null && status != 0)) return
         log.i("<- AuthComplete: status=$status")
         status?.let { SessionReport.auth(it) }
 
@@ -356,17 +409,16 @@ class GearslipRunner(
                 SessionStatus.connecting("Certificate accepted - discovering services")
                 sendServiceDiscoveryRequest()
             }
-            -2 -> {
-                SessionReport.fail(SessionReport.Category.CERTIFICATE, "AuthComplete status -2 (certificate error)", state.name, "auth -2")
-                log.verdict(
-                    "NOT VIABLE (STATUS_CERTIFICATE_ERROR)",
-                    "The head unit explicitly rejected the phone's self-signed certificate. " +
-                        "This is a definitive no - it validates the phone against a trust chain " +
-                        "we cannot issue from.",
-                )
+            -2, -23, -24 -> {
+                val reason = when (status) {
+                    -23, -24 -> certificateDates(status)
+                    else -> "The head unit refused the phone's certificate."
+                }
+                SessionReport.fail(SessionReport.Category.CERTIFICATE, "AuthComplete status $status", state.name, "auth $status")
+                log.w("certificate rejected: $reason")
                 SessionStatus.failed(
                     "Head unit rejected the certificate",
-                    "The head unit refused the phone's certificate (certificate error).",
+                    reason,
                 )
                 state = State.DONE
                 authenticationFailed = true
@@ -397,16 +449,51 @@ class GearslipRunner(
                 authenticationFailed = true
             }
         }
+        if (authenticationFailed) running = false
     }
 
+    /**
+     * The car checks the certificate's dates against its own clock. When they're fine by the
+     * phone's clock, the car's clock is the one that's wrong, which a flat battery or a car
+     * that never got the time from GPS leaves behind.
+     */
+    private fun certificateDates(status: Int): String {
+        val cert = phoneCert ?: return if (status == -23) "The phone's certificate is not valid yet." else "The phone's certificate has expired."
+        val now = java.util.Date()
+        val day = java.text.DateFormat.getDateInstance(java.text.DateFormat.LONG)
+        return when {
+            status == -23 && now.before(cert.notBefore) ->
+                "The phone's certificate is not valid until ${day.format(cert.notBefore)}."
+            status == -24 && now.after(cert.notAfter) ->
+                "The phone's certificate expired on ${day.format(cert.notAfter)}. Get a new one under Certificate in Settings."
+            else -> {
+                val side = if (status == -23) "behind" else "ahead"
+                log.w("the certificate's dates are fine by the phone's clock, so the car's clock is $side")
+                "The car's clock looks wrong: the certificate is valid today, but the car thinks it " +
+                    (if (status == -23) "isn't valid yet" else "has expired") +
+                    ". Set the car's date and time, then connect again."
+            }
+        }
+    }
+
+    /**
+     * What a real phone sends here: its icon at three sizes (fields 1 to 3), a label, its model,
+     * and a session ID that's new each connection (field 6). A 2017 Hyundai on protocol 1.0
+     * never answered the request when it had only the label and model (issue #47).
+     */
     private fun sendServiceDiscoveryRequest() {
-        val body = Protobuf.stringField(4, "Gearslip") + // label_text
-            Protobuf.stringField(5, Build.MODEL)        // device_name
+        val icons = runCatching(phoneIcons).getOrDefault(emptyList())
+        var body = ByteArray(0)
+        icons.take(3).forEachIndexed { i, png -> body += Protobuf.bytesField(i + 1, png) } // small, medium, large icon
+        body += Protobuf.stringField(4, "Gearslip") + // label_text
+            Protobuf.stringField(5, Build.MODEL) + // device_name
+            Protobuf.bytesField(6, Protobuf.stringField(1, java.util.UUID.randomUUID().toString())) // session ID
         send(MSG_SERVICE_DISCOVERY_REQUEST, body, encrypted = true)
-        log.i("-> ServiceDiscoveryRequest (encrypted)")
+        log.i("-> ServiceDiscoveryRequest (encrypted, ${icons.size} icons, ${body.size} bytes)")
     }
 
     private fun onServiceDiscoveryResponse(body: ByteArray) {
+        if (state != State.WAIT_SDR) return
         log.i("<- ServiceDiscoveryResponse (${body.size} bytes, decrypted successfully)")
         // Field 5 is the car's serial number, and the Bluetooth service carries the car's
         // Bluetooth address. Either one identifies the car, and logs get shared, so both stay out.
@@ -421,10 +508,12 @@ class GearslipRunner(
                 "possible against THIS unit - portability to newer units is still unproven.",
         )
         state = State.DONE
+        startPhonePings()
         val info = ServiceDiscovery.findHeadUnitInfo(body)
         log.i("head unit: $info")
         SessionReport.headUnit(info.toString())
         SessionReport.headUnitInfo = info
+        app.seb3thehacker.gearslip.car.CarData.onModel(info.carModel, info.carYear)
         vehicleProfile = runCatching { vehicleProfileFor(info) }.getOrNull()
         val profile = vehicleProfile
         SessionReport.profile(profile?.name)
@@ -475,6 +564,8 @@ class GearslipRunner(
         startSensorChannel(serviceDiscoveryResponse)
         startMicChannel(serviceDiscoveryResponse)
         startMediaStatusChannel(serviceDiscoveryResponse)
+        startPhoneStatusChannel(serviceDiscoveryResponse)
+        startClusterVideo(serviceDiscoveryResponse)
         startClusterNavChannel(serviceDiscoveryResponse)
         startBluetooth(serviceDiscoveryResponse)
         startVendorChannel(serviceDiscoveryResponse)
@@ -526,8 +617,20 @@ class GearslipRunner(
             // The driver picked the radio or another source on the car: pause the phone's music
             // as Android Auto does, instead of letting it play on to no one.
             onTakenBack = { CarServices.pausePhoneMedia("the car switched to another source") },
+            onPausedForNow = { CarServices.pausePhoneMediaForNow() },
+            onGivenBack = { CarServices.resumePhoneMedia() },
         )
-        openChannel(media.serviceId)
+        if (CarSettings.pipeAudio.value) {
+            openChannel(media.serviceId)
+        } else {
+            // Many cars switch their source to Android Auto the moment this channel opens, which
+            // cut off music the driver chose to play over Bluetooth. Open it only if they switch.
+            log.i("music goes over Bluetooth: the media channel stays closed, so the car keeps its own source")
+            CarAudio.openSink = {
+                CarAudio.openSink = null
+                openChannel(media.serviceId)
+            }
+        }
     }
 
     /** The car's directions channel, where [DirectionsVoice] reads out each turn. */
@@ -545,7 +648,9 @@ class GearslipRunner(
             tag = "guidance",
             sessionId = GUIDANCE_SESSION_ID,
             asksFocus = false,
-            onReady = { DirectionsVoice.attach(it) },
+            onReady = {
+                DirectionsVoice.attach(it, musicIsOurs = { audioLink?.streaming == true }, musicSink = { audioLink?.takeIf { link -> link.isReady } })
+            },
             onClose = { DirectionsVoice.detach(it) },
         )
         openChannel(guidance.serviceId)
@@ -581,6 +686,32 @@ class GearslipRunner(
         openChannel(channel)
     }
 
+    /** The turn card on the instrument cluster, for a car with a cluster screen: experimental, off by default. */
+    private fun startClusterVideo(serviceDiscoveryResponse: ByteArray) {
+        val sink = ServiceDiscovery.findClusterVideoService(serviceDiscoveryResponse) ?: return
+        log.i("cluster video sink: channel=${sink.serviceId} display=${sink.displayId} type=${sink.displayType}")
+        if (!CarSettings.experimentalFeaturesEnabled.value || !CarSettings.clusterVideoEnabled.value) {
+            log.i("cluster screen is off in the car's Settings (experimental) - leaving that sink alone")
+            return
+        }
+        val context = app.seb3thehacker.gearslip.car.CarEnvironment.appContext ?: return
+        clusterVideo = ClusterVideo(context, sink) { id, body -> send(id, body, encrypted = true, channel = sink.serviceId) }
+        openChannel(sink.serviceId)
+    }
+
+    /** Calls, for the car's own screens: the cluster, the steering wheel display. */
+    private fun startPhoneStatusChannel(serviceDiscoveryResponse: ByteArray) {
+        val channel = ServiceDiscovery.findPhoneStatusChannel(serviceDiscoveryResponse) ?: run {
+            log.i("no phone status channel - the car's own screens won't show calls")
+            return
+        }
+        log.i("phone status channel: $channel")
+        phoneStatus = app.seb3thehacker.gearslip.call.CarPhoneStatus(channel) { id, body ->
+            send(id, body, encrypted = true, channel = channel)
+        }
+        openChannel(channel)
+    }
+
     /** Bluetooth pairing, for calls: the channel only opens if the driver asks to pair. */
     /**
      * GM's own channel ("com.gm.vip"), opened in GM cars only. Issue #18: a 2021 Bolt ends every
@@ -619,12 +750,15 @@ class GearslipRunner(
 
     /** Turn-by-turn for the instrument cluster: the next turn, its road, and how far. */
     private fun startClusterNavChannel(serviceDiscoveryResponse: ByteArray) {
-        val channel = ServiceDiscovery.findNavStatusChannel(serviceDiscoveryResponse) ?: run {
+        val navigation = ServiceDiscovery.findNavStatusService(serviceDiscoveryResponse) ?: run {
             log.i("no navigation status channel - the cluster won't show turns")
             return
         }
+        val channel = navigation.serviceId
         log.i("navigation status channel: $channel")
-        clusterNav = ClusterNav(channel) { id, body -> send(id, body, encrypted = true, channel = channel) }
+        clusterNav = ClusterNav(channel, navigation.minimumIntervalMs.toLong()) { id, body ->
+            send(id, body, encrypted = true, channel = channel)
+        }
         openChannel(channel)
     }
 
@@ -680,7 +814,7 @@ class GearslipRunner(
      */
     private fun onNightSensor(body: ByteArray) {
         val night = Wire.bytes(Wire.fields(body), SENSOR_NIGHT) ?: return
-        val isNight = Wire.varint(Wire.fields(night), 1) == 1L
+        val isNight = (Wire.varint(Wire.fields(night), 1) ?: 0L) != 0L
         if (isNight != lastSensorNight) {
             lastSensorNight = isNight
             log.i("car says it's ${if (isNight) "night" else "day"}")
@@ -716,6 +850,7 @@ class GearslipRunner(
 
             MSG_SENSOR_EVENT_INDICATION -> {
                 CarSensors.onEvent(body)
+                app.seb3thehacker.gearslip.car.CarData.onEvent(body)
                 logSensorEvent(body)
                 onNightSensor(body)
             }
@@ -763,59 +898,60 @@ class GearslipRunner(
             MSG_KEY_BINDING_RESPONSE ->
                 log.i("<- KeyBindingResponse: status=${Protobuf.readInt32Field(body, 1)}")
 
-            MSG_INPUT_REPORT -> {
-                val report = Wire.fields(body)
-                // The 2018 Uconnect agrees to Exit but keeps showing our last frame and sending
-                // touches, which looked like a crash. A touch means our screen is still up there.
-                if (videoStarted && !videoProjected && Wire.bytes(report, 3) != null) {
-                    log.w("the car said it took its screen back but still sends touches - showing ours again")
-                    onVideoFocus(VIDEO_FOCUS_PROJECTED)
-                }
-                Wire.bytes(report, 4)?.let(::onKeyEvent)
-                Wire.bytes(report, 6)?.let(::onRelativeEvent)
-                val touch = Wire.bytes(report, 3) ?: Wire.bytes(report, 7)
-                if (touch == null) {
-                    return
-                }
-                val touchFields = Wire.fields(touch)
-                val action = Wire.varint(touchFields, 3)?.toInt() ?: 0
-                val pointers = Wire.allBytes(touchFields, 1)
-                if (pointers.isEmpty()) return
-                val config = videoConfigs.getOrNull(selectedConfigIndex ?: 0)
-                val size = config?.pixelSize()
-                // The car crops its margin off the frame and measures taps from the corner of what
-                // it shows, so they come in short by half the margin: the 2024 VW (margin 240) sent
-                // y=6, which is inside the cropped band, and the Uconnect's never passed 351 on a
-                // 480-high frame with a 130 margin. Without this every tap landed 120 px too high
-                // and the VW couldn't press past its first screen.
-                val shift = config?.marginInsets() ?: Insets.NONE
-                val points = pointers.mapIndexedNotNull { index, pointer ->
-                    val fields = Wire.fields(pointer)
-                    val rawX = Wire.varint(fields, 1)?.toInt() ?: return@mapIndexedNotNull null
-                    val rawY = Wire.varint(fields, 2)?.toInt() ?: return@mapIndexedNotNull null
-                    val id = Wire.varint(fields, 3)?.toInt() ?: index
-                    TouchPoint(id, clamp(rawX + shift.left, size?.first), clamp(rawY + shift.top, size?.second))
-                }
-                if (points.isEmpty()) return
-                val actionIndex = (Wire.varint(touchFields, 2)?.toInt() ?: 0).coerceIn(0, points.size - 1)
-                if (points.size > 1 && touchesSeen < 3) {
-                    log.i("multi-touch: ${points.size} pointers, action=$action index=$actionIndex")
-                }
-
-                touchesSeen++
-                if (touchesSeen <= 10 || action == ACTION_DOWN || action == ACTION_UP) {
-                    val at = points[actionIndex]
-                    log.i("<- Touch action=$action at (${at.x.toInt()},${at.y.toInt()}) pointers=${points.size}")
-                }
-                // Time the next frame against this tap: see [reportTouchLatency].
-                if (action == ACTION_DOWN || action == ACTION_UP) touchAtUs = System.nanoTime() / 1000
-                projection?.onTouch(action, actionIndex, points)
-            }
+            MSG_INPUT_REPORT -> onInputReport(body)
 
             else -> log.i("<- unhandled input message id=$messageId (${body.size} bytes)")
         }
     }
 
+    private fun onInputReport(body: ByteArray) {
+        val report = Wire.fields(body)
+        if (Wire.varint(report, 1) == null) return
+        Wire.bytes(report, 4)?.let(::onKeyEvent)
+        Wire.bytes(report, 6)?.let(::onRelativeEvent)
+        // Touchpads (field 7) need a separate gesture pipeline; their coordinates are not
+        // positions on the projected screen.
+        val touch = Wire.bytes(report, 3)
+        if (touch == null) {
+            return
+        }
+        // The 2018 Uconnect agrees to Exit but keeps showing our last frame and sending
+        // touches, which looked like a crash. A touch means our screen is still up there.
+        if (videoStarted && !videoProjected) {
+            log.w("the car said it took its screen back but still sends touches - showing ours again")
+            onVideoFocus(VIDEO_FOCUS_PROJECTED)
+        }
+        val config = videoConfigs.getOrNull(selectedConfigIndex ?: 0)
+        // The car crops its margin off the frame and measures taps from the corner of what it
+        // shows, so they come in short by half the margin: the 2024 VW (margin 240) sent y=6,
+        // inside the cropped band, and the Uconnect's never passed 351 on a 480-high frame with a
+        // 130 margin. Without this every tap landed 120 px too high.
+        val shift = config?.let(::marginsFor) ?: Insets.NONE
+        val size = config?.pixelSize()
+        // A stretched frame (see [screenShape]): the car's tap is on the frame, the UI is drawn smaller.
+        val drawn = drawSize
+        val stretched = drawn != null && size != null
+        val (action, actionIndex, raw) =
+            (if (stretched) InputProtocol.touch(touch, size) else InputProtocol.touch(touch, size, shift.left, shift.top)) ?: return
+        val points = if (drawn != null && size != null) {
+            raw.map { TouchPoint(it.id, it.x * drawn.first / size.first, it.y * drawn.second / size.second) }
+        } else {
+            raw
+        }
+        if (points.size > 1 && touchesSeen < 3) {
+            log.i("multi-touch: ${points.size} pointers, action=$action index=$actionIndex")
+        }
+
+        touchesSeen++
+        if (touchesSeen <= 10 || action == ACTION_DOWN || action == ACTION_UP) {
+            val at = points[actionIndex]
+            log.i("<- Touch action=$action at (${at.x.toInt()},${at.y.toInt()}) pointers=${points.size}")
+        }
+        // Time the next frame against this tap: see [reportTouchLatency].
+        if (action == ACTION_DOWN || action == ACTION_UP) touchAtUs = System.nanoTime() / 1000
+        projection?.onTouch(action, actionIndex, points)
+    }
+
     /**
      * Asks the head unit to forward its buttons. Many units send nothing from the steering wheel
      * until the phone names the keys it wants. What the unit offered is asked for; a unit that
@@ -903,11 +1039,8 @@ class GearslipRunner(
                     "${videoConfigs.getOrNull(selectedConfigIndex ?: -1)?.resolutionName ?: "?"} " +
                         "(head unit offered ${offered.size}), max_unacked=$maxUnacked",
                 )
-                // VideoFocusRequestNotification { mode = 2; reason = 3 }
-                val focus = Protobuf.varintField(2, VIDEO_FOCUS_PROJECTED.toLong()) +
-                    Protobuf.varintField(3, 1L)
-                send(MSG_VIDEO_FOCUS_REQUEST, focus, encrypted = true, channel = videoChannelId)
-                log.i("-> VideoFocusRequest(mode=PROJECTED)")
+                requestProjectedFocus()
+                if (CarAudio.openSink != null) watchForWithheldScreen()
             }
 
             MSG_VIDEO_FOCUS_NOTIFICATION -> {
@@ -967,6 +1100,37 @@ class GearslipRunner(
         return wide.minByOrNull(::pixels) ?: known.maxByOrNull(::pixels)
     }
 
+    /**
+     * The part of a [frameWidth] x [frameHeight] frame shaped like the screen size set in
+     * Settings, centred and in even pixels; null when none is set or it is the frame's own shape.
+     * Some head units report the wrong size, then crop or squash the frame onto their real screen.
+     */
+    private fun screenShape(frameWidth: Int, frameHeight: Int): Pair<Int, Int>? {
+        val screen = CarSettings.screenSize.value ?: return null
+        val wider = screen.width.toLong() * frameHeight >= screen.height.toLong() * frameWidth
+        val shape = if (wider) {
+            frameWidth to (frameWidth.toLong() * screen.height / screen.width).toInt()
+        } else {
+            (frameHeight.toLong() * screen.width / screen.height).toInt() to frameHeight
+        }
+        val even = (shape.first / 2 * 2).coerceAtLeast(2) to (shape.second / 2 * 2).coerceAtLeast(2)
+        return even.takeIf { it != (frameWidth to frameHeight) }
+    }
+
+    /**
+     * The strips of the frame the car doesn't show: the head unit's own margins, or, when a screen
+     * size is set to crop, whatever lies outside [screenShape]. The UI keeps out of them and taps
+     * are measured from inside them.
+     */
+    private fun marginsFor(config: ServiceDiscovery.VideoConfig): Insets {
+        val (width, height) = config.pixelSize() ?: return config.marginInsets()
+        if (CarSettings.screenFit.value != ScreenFit.CROP) return config.marginInsets()
+        val (w, h) = screenShape(width, height) ?: return config.marginInsets()
+        val sideX = width - w
+        val sideY = height - h
+        return Insets(top = sideY / 2, bottom = sideY - sideY / 2, left = sideX / 2, right = sideX - sideX / 2)
+    }
+
     private fun startVideoSource() {
         lastKeyframeSentAt = System.currentTimeMillis() // frame #1 is always a keyframe
         val index = selectedConfigIndex ?: 0
@@ -987,18 +1151,37 @@ class GearslipRunner(
         log.i("-> Start(session_id=$SESSION_ID, configuration_index=$index -> $config)")
         // The car crops its margins off the frame, so keep the UI out of them unless a vehicle
         // profile has its own tuned insets.
-        if (vehicleProfile?.insets.let { it == null || it == Insets.NONE }) {
-            val insets = config.marginInsets()
+        stretcher?.release()
+        stretcher = null
+        drawSize = null
+        val shape = screenShape(width, height)
+        val squash = shape != null && CarSettings.screenFit.value == ScreenFit.SQUASH
+        if (shape != null) {
+            log.i(
+                "screen size set to ${CarSettings.screenSize.value} in Settings: " +
+                    "${if (squash) "drawing" else "cropping to"} ${shape.first}x${shape.second} of the ${width}x$height frame",
+            )
+        }
+        if (squash) {
+            CarEnvironment.setInsets(Insets.NONE)
+        } else if (vehicleProfile?.insets.let { it == null || it == Insets.NONE }) {
+            val insets = marginsFor(config)
             CarEnvironment.setInsets(insets)
             if (insets != Insets.NONE) log.i("keeping the UI clear of the car's margins: $insets")
         }
 
         val useProjection = projection != null
+        // 60fps only over a cable: over Wi-Fi it doubles the data for little the driver sees.
+        videoFrameRate = if (config.frameRate == 1 && !wireless) 60 else 30
+        smoothWindows = 0
+        lastCut = null
+        decoderBound = false
+        adaptiveVideo = CarSettings.experimentalFeaturesEnabled.value && CarSettings.adaptiveVideoEnabled.value
+        if (adaptiveVideo) log.i("video: adaptive bitrate on (experimental)")
         videoSource = VideoSource(
             width = width,
             height = height,
-            // 60fps only over a cable: over Wi-Fi it doubles the data for little the driver sees.
-            frameRate = if (config.frameRate == 1 && !wireless) 60 else 30,
+            frameRate = videoFrameRate,
             mode = if (useProjection) VideoSource.Mode.SURFACE else VideoSource.Mode.TEST_CARD,
             wireless = wireless,
             onCodecConfig = { csd ->
@@ -1010,12 +1193,22 @@ class GearslipRunner(
             onFrame = { data, presentationTimeUs, keyFrame ->
                 sendVideoFrame(data, presentationTimeUs, keyFrame)
             },
+            onStill = { projection?.onStill() },
         ).also { source ->
             runCatching {
                 source.start()
                 val surface = source.inputSurface
                 if (projection != null && surface != null) {
-                    projection.onSurfaceReady(surface, width, height, config.density)
+                    val stretch = shape?.takeIf { squash }?.let { (w, h) ->
+                        FrameStretcher(surface, w, h, width, height).takeIf { it.start() }
+                    }
+                    stretcher = stretch
+                    if (stretch != null) {
+                        drawSize = stretch.width to stretch.height
+                        projection.onSurfaceReady(stretch.input, stretch.width, stretch.height, config.density)
+                    } else {
+                        projection.onSurfaceReady(surface, width, height, config.density)
+                    }
                     SessionStatus.projecting()
                     BluetoothAudioCheck.onProjecting()
                     LocationCheck.onProjecting()
@@ -1124,6 +1317,38 @@ class GearslipRunner(
         }
     }
 
+    /** Asks the car for its screen; the answer comes to [onVideoFocus]. */
+    private fun requestProjectedFocus() {
+        // VideoFocusRequestNotification { mode = 2; reason = 3 }. Reason 1 means "the phone's
+        // screen is off", which a 2020 Civic may have taken as a reason to keep its own
+        // screen (issue #43); 0 is UNKNOWN.
+        val focus = Protobuf.varintField(2, VIDEO_FOCUS_PROJECTED.toLong()) +
+            Protobuf.varintField(3, 0L)
+        send(MSG_VIDEO_FOCUS_REQUEST, focus, encrypted = true, channel = videoChannelId)
+        log.i("-> VideoFocusRequest(mode=PROJECTED)")
+    }
+
+    /**
+     * Some older head units keep their own screen until every channel the phone was offered is
+     * open: a 2017 Pilot, a 2020 Civic and a 2024 Mirage (issues #43, #49, #57) never showed
+     * ours with the media channel closed, and the Mirage worked on 0.3.01, which opened it. With
+     * music over Bluetooth that channel waits for the car to switch source, so if the screen
+     * hasn't come a few seconds after asking, open it and ask again. Cars that hand the screen
+     * straight over keep their own source as before.
+     */
+    private fun watchForWithheldScreen() {
+        Thread({
+            Thread.sleep(WITHHELD_SCREEN_MS)
+            if (!running || videoStarted) return@Thread
+            val open = CarAudio.openSink ?: return@Thread
+            log.w("no screen from the car after ${WITHHELD_SCREEN_MS / 1000}s - opening the media channel and asking again")
+            open()
+            // Give the car the channel's open response before it hears the request again.
+            Thread.sleep(1_000)
+            if (running && !videoStarted) requestProjectedFocus()
+        }, "gearslip-focus-fallback").apply { isDaemon = true }.start()
+    }
+
     /** Android Auto's Exit: asks the car for its own interface, leaving the session running. */
     private fun requestNativeFocus() {
         if (!videoStarted) return
@@ -1156,18 +1381,47 @@ class GearslipRunner(
         log.i("touch -> frame: ${draw + encode}ms (draw ${draw}ms, encode and wait ${encode}ms)")
     }
 
-    private fun clamp(value: Int, limit: Int?): Float = when {
-        limit == null -> value.toFloat()
-        value < 0 -> 0f
-        value >= limit -> (limit - 1).toFloat()
-        else -> value.toFloat()
+    /**
+     * Android Auto pings the car too, not only answers its pings; either side may. A 2021 Bolt
+     * hangs up 25 seconds into every drive while its own pings get answered and GM's channel is
+     * open (issue #18), so the one thing left that a real phone sends and Gearslip didn't is this.
+     */
+    private fun startPhonePings() {
+        Thread({
+            while (running && state == State.DONE) {
+                runCatching {
+                    send(MSG_PING_REQUEST, Protobuf.varintField(1, System.nanoTime() / 1_000), encrypted = true)
+                }.onFailure { return@Thread }
+                pingsSent++
+                if (pingsSent == 1) log.i("-> PingRequest (Gearslip pings the car once a second)")
+                try {
+                    Thread.sleep(PHONE_PING_MS)
+                } catch (e: InterruptedException) {
+                    return@Thread
+                }
+            }
+        }, "gearslip-ping").apply { isDaemon = true }.start()
+    }
+
+    @Volatile private var pingsSent = 0
+    private var pingsAnswered = 0
+
+    private fun onPingResponse() {
+        pingsAnswered++
+        if (pingsAnswered == 1 || pingsAnswered % PING_LOG_EVERY == 0) {
+            log.i("<- PingResponse ($pingsAnswered of $pingsSent answered)")
+        }
     }
 
     private fun onPingRequest(body: ByteArray) {
         // The timestamp is an int64 and has to come back unchanged. Read as an int32 it was cut
         // short, and a car that checks the echo (an Audi MIB2+) gave up at its second ping.
-        val timestamp = Protobuf.readInt64Field(body, 1) ?: System.nanoTime()
-        send(MSG_PING_RESPONSE, Protobuf.varintField(1, timestamp), encrypted = tls.handshakeComplete)
+        val fields = Wire.fields(body)
+        val timestamp = Wire.varint(fields, 1) ?: return
+        val payload = Wire.bytes(fields, 3)
+        val response = Protobuf.varintField(1, timestamp) +
+            (payload?.let { Protobuf.bytesField(2, it) } ?: byteArrayOf())
+        send(MSG_PING_RESPONSE, response, encrypted = tls.handshakeComplete)
         log.i("<- PingRequest(timestamp=$timestamp) / -> PingResponse (keeping the session alive)")
     }
 
@@ -1189,41 +1443,16 @@ class GearslipRunner(
         try {
             writer.execute {
                 try {
-                    if (payload.size <= Frames.MAX_FRAME_PAYLOAD) {
-                        val framePayload = if (encrypted) tls.encrypt(payload) else payload
-                        output.write(Frames.build(channel, encrypted, framePayload, messageType))
-                    } else {
-                        // Split exactly as aasdk does: chunk the *plaintext*, encrypt each chunk
-                        // separately, and carry the total plaintext length in the FIRST frame.
-                        // Video keyframes for anything busier than a test card exceed 16 KB routinely.
-                        var offset = 0
-                        while (offset < payload.size) {
-                            val size = minOf(Frames.MAX_FRAME_PAYLOAD, payload.size - offset)
-                            val chunk = payload.copyOfRange(offset, offset + size)
-                            val frameType = when {
-                                offset == 0 -> Frames.TYPE_FIRST
-                                offset + size >= payload.size -> Frames.TYPE_LAST
-                                else -> Frames.TYPE_MIDDLE
-                            }
-                            val framePayload = if (encrypted) tls.encrypt(chunk) else chunk
-                            output.write(
-                                Frames.build(
-                                    channel, encrypted, framePayload, messageType, frameType,
-                                    if (frameType == Frames.TYPE_FIRST) payload.size else null,
-                                ),
-                            )
-                            offset += size
-                        }
-                        splitMessages++
-                    }
+                    val frameCount = Frames.writeMessage(output, channel, encrypted, messageType, payload) { tls.encrypt(it) }
+                    if (frameCount > 1) splitMessages++
                     output.flush()
-                } catch (e: java.io.IOException) {
+                } catch (e: IOException) {
                     if (running) log.w("send failed, stopping: ${e.message}")
                     running = false
                     videoSource?.stop()
                 }
             }
-        } catch (e: java.util.concurrent.RejectedExecutionException) {
+        } catch (e: RejectedExecutionException) {
             // The session is over; nothing more goes out.
         }
     }
@@ -1277,6 +1506,9 @@ class GearslipRunner(
         SessionReport.print()
     }
 
+    private val startedAt = System.currentTimeMillis()
+    private var toldStuck = false
+
     private fun startWatchdog() {
         Thread {
             var lastFrames = 0
@@ -1288,6 +1520,11 @@ class GearslipRunner(
                     val idle = System.currentTimeMillis() - lastProgress
                     if (idle > 10_000) log.w("stalled in state $state for ${idle / 1000}s")
                 }
+                if (!videoStarted && !toldStuck && System.currentTimeMillis() - startedAt > STUCK_MS) {
+                    toldStuck = true
+                    log.w("still not on the car's screen after ${STUCK_MS / 1000}s, in state $state")
+                    SessionStatus.stillConnecting(if (wireless) SessionStatus.Link.WIRELESS else SessionStatus.Link.CABLE)
+                }
 
                 // Stream health. Without this a drive cannot tell "streaming fine" from
                 // "stalled after three frames" - the per-frame logging is deliberately sparse.
@@ -1302,8 +1539,10 @@ class GearslipRunner(
                     SessionReport.stream("${"%.1f".format(fps)} fps, sent=$sent acked=$acksSeen")
                     log.i(
                         "video: ${"%.1f".format(fps)} fps over 5s | sent=$sent waited=${waited}ms " +
-                            "acked=$acksSeen inFlight=$inFlight split=$splitMessages",
+                            "acked=$acksSeen inFlight=$inFlight split=$splitMessages " +
+                            "kbps=${(videoSource?.bitRate ?: 0) / 1000}",
                     )
+                    adaptBitRate(fps, waited)
 
                     // Self-healing safety net: force a fresh keyframe periodically regardless
                     // of whether we think one is owed. Protects against any future case where
@@ -1318,13 +1557,68 @@ class GearslipRunner(
         }.apply { isDaemon = true }.start()
     }
 
-    private companion object {
-        /**
-         * The protocol version Gearslip answers every car with, as (major, minor), or null to echo
-         * the head unit's. Kept at 1.3 because every working car was tested with it; see
-         * onVersionRequest.
-         */
-        val CLAIM_VERSION: Pair<Int, Int>? = 1 to 3
+    /** The frame rate the stream was set up for, which adaptive bitrate measures against. */
+    @Volatile private var videoFrameRate = 30
+
+    /** Five-second windows in a row the stream kept up, towards climbing back up. */
+    private var smoothWindows = 0
+    /** The bitrate and frame rate before the last cut, to see whether cutting helped. */
+    private var lastCut: Pair<Int, Double>? = null
+    /** Experimental: read once per stream, so flipping the switch mid-drive changes nothing. */
+    @Volatile private var adaptiveVideo = false
+    /** Set once a cut didn't help: this car's decoder, not the link, sets the pace. */
+    private var decoderBound = false
+
+    /**
+     * Adaptive bitrate. A window where the encoder spent most of its time held back by the
+     * car's acks while the frame rate sagged means the car, or the Wi-Fi to it, can't take
+     * frames this size: a quarter comes off. Two easy windows in a row put a tenth back, up to
+     * where the stream started. A still screen (few frames, no waiting) changes nothing.
+     */
+    private fun adaptBitRate(fps: Double, waitedMs: Long) {
+        if (!adaptiveVideo) return
+        val source = videoSource ?: return
+        val target = videoFrameRate.toDouble()
+        val behind = waitedMs > ADAPT_WINDOW_MS / 2 && fps < target * 0.8
+        val easy = waitedMs < ADAPT_WINDOW_MS / 10
+        when {
+            behind && !decoderBound -> {
+                smoothWindows = 0
+                val cut = lastCut
+                if (cut != null && fps < cut.second * 1.05) {
+                    // The last cut bought no frames: the car's decoder is the limit, not the
+                    // link, and smaller frames would only look worse. Undo it and stop here.
+                    decoderBound = true
+                    source.setBitRate(cut.first)
+                    log.i("video: a lower bitrate didn't help the car keep up - back to ${cut.first / 1000} kbps, adapting off")
+                    return
+                }
+                val before = source.bitRate
+                source.setBitRate((before * 0.75).toInt())
+                if (source.bitRate != before) {
+                    lastCut = before to fps
+                    log.i("video: car falling behind - bitrate ${before / 1000} -> ${source.bitRate / 1000} kbps")
+                }
+            }
+            easy && source.bitRate < source.fullBitRate -> {
+                lastCut = null
+                if (++smoothWindows >= 2) {
+                    smoothWindows = 0
+                    val before = source.bitRate
+                    source.setBitRate((before * 1.1).toInt() + 1)
+                    log.i("video: keeping up - bitrate ${before / 1000} -> ${source.bitRate / 1000} kbps")
+                }
+            }
+            else -> smoothWindows = 0
+        }
+    }
+
+    internal companion object {
+        /** The stats window adaptive bitrate reads, matching the watchdog's sleep. */
+        const val ADAPT_WINDOW_MS = 5_000L
+
+        /** A car shows its screen within seconds; this long without one, Home says what to try. */
+        const val STUCK_MS = 45_000L
 
         // protobuf/aap_protobuf/service/control/ControlMessageType.proto:7-17
         const val MSG_VERSION_REQUEST = 1
@@ -1335,9 +1629,13 @@ class GearslipRunner(
         const val MSG_SERVICE_DISCOVERY_RESPONSE = 6
         const val MSG_PING_REQUEST = 11
         const val MSG_PING_RESPONSE = 12
+        private const val PHONE_PING_MS = 1_000L
+        private const val PING_LOG_EVERY = 60
         const val MSG_BYEBYE_REQUEST = 15
         const val MSG_BYEBYE_RESPONSE = 16
         const val MSG_VOICE_SESSION_NOTIFICATION = 17
+        const val MSG_UNEXPECTED_MESSAGE = 255
+        const val MSG_FRAMING_ERROR = 65535
         const val MSG_CHANNEL_OPEN_REQUEST = 7
         const val MSG_CHANNEL_OPEN_RESPONSE = 8
 
@@ -1377,6 +1675,7 @@ class GearslipRunner(
         const val ACTION_UP = 1
 
         const val ACK_STALL_MS = 2_000L
+        const val WITHHELD_SCREEN_MS = 5_000L
         const val AUDIO_TRACE_MESSAGES = 6
         const val GUIDANCE_SESSION_ID = 1
         const val PERIODIC_KEYFRAME_MS = 5_000L

gearslip/src/main/java/app/seb3thehacker/gearslip/LauncherActivity.kt

@@ -0,0 +1,152 @@
+package app.seb3thehacker.gearslip
+
+import android.content.Intent
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.KeyEvent
+import android.view.WindowManager
+import androidx.activity.ComponentActivity
+import androidx.activity.OnBackPressedCallback
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Button
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.core.view.WindowCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.WindowInsetsControllerCompat
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import app.seb3thehacker.gearslip.car.CarEnvironment
+import app.seb3thehacker.gearslip.car.CarKeys
+import app.seb3thehacker.gearslip.car.CarSettings
+import app.seb3thehacker.gearslip.car.CarUi
+import app.seb3thehacker.gearslip.car.LauncherMode
+import app.seb3thehacker.gearslip.car.Prefetch
+import app.seb3thehacker.gearslip.ui.CarFrame
+import app.seb3thehacker.gearslip.ui.GearslipTheme
+import app.seb3thehacker.gearslip.ui.rememberCarProjector
+
+/**
+ * The home screen in launcher mode (see [LauncherMode]): the car UI, filling this device's own
+ * screen. It runs for as long as the activity lives, not only while it's in front, so a map
+ * keeps guiding and music keeps playing while another app is open over it.
+ */
+class LauncherActivity : ComponentActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        GearslipLog.init(this)
+        GearslipLog.installCrashHandler()
+        CarSettings.init(this)
+        CarKeys.init(this)
+        Prefetch.warm(this)
+        CarEnvironment.setPhoneTheme(resources.configuration)
+
+        // A dash screen is something to glance at: it stays on, with the system bars out of the way.
+        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        WindowCompat.setDecorFitsSystemWindows(window, false)
+        WindowInsetsControllerCompat(window, window.decorView).apply {
+            systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+            hide(WindowInsetsCompat.Type.systemBars())
+        }
+        // Back moves back in the car UI. A home screen has nowhere else to go back to.
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                CarKeys.onKey(KeyEvent.KEYCODE_BACK, down = true, longPress = false)
+            }
+        })
+
+        setContent {
+            GearslipTheme {
+                LauncherScreen(onOpenGearslip = { startActivity(Intent(this, GearslipActivity::class.java)) })
+            }
+        }
+    }
+
+    /** Home pressed while Gearslip is already the home screen: back to the car UI's Home. */
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        CarKeys.onKey(KeyEvent.KEYCODE_HOME, down = true, longPress = false)
+    }
+
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
+        CarEnvironment.setPhoneTheme(newConfig)
+    }
+
+    /** A head unit's knob, D-pad and hard keys work the car UI the way a car's do. */
+    override fun dispatchKeyEvent(event: KeyEvent): Boolean {
+        if (event.keyCode != KeyEvent.KEYCODE_BACK && event.repeatCount == 0 &&
+            CarKeys.onKey(event.keyCode, event.action == KeyEvent.ACTION_DOWN, event.isLongPress)
+        ) return true
+        return super.dispatchKeyEvent(event)
+    }
+}
+
+@Composable
+private fun LauncherScreen(onOpenGearslip: () -> Unit) {
+    val status by SessionStatus.state.collectAsStateWithLifecycle()
+    // Plugged into a car, this device is the phone and the car UI belongs on the car's screen.
+    val inCar = status.phase == SessionStatus.Phase.CONNECTING || status.phase == SessionStatus.Phase.PROJECTING
+    if (inCar) {
+        InCarNotice(onOpenGearslip)
+        return
+    }
+    BoxWithConstraints(Modifier.fillMaxSize().background(MaterialTheme.colorScheme.background)) {
+        val px = with(LocalDensity.current) { maxWidth.roundToPx() / 2 * 2 to maxHeight.roundToPx() / 2 * 2 }
+        val (width, height) = px
+        if (width <= 0 || height <= 0) return@BoxWithConstraints
+        // Car-like text and buttons: 160dpi for every 480 pixels of height, as the car preview uses.
+        // This screen stands in for the car's, so hosted apps size to it and the density setting applies.
+        val density = remember(width, height) {
+            CarEnvironment.setDisplay(width, height, (160 * height / 480).coerceIn(120, 640))
+            CarEnvironment.frame.value.densityDpi
+        }
+        // Before the projector starts, so the car UI's first screen already knows what to hide.
+        DisposableEffect(Unit) {
+            LauncherMode.setActive(true)
+            onDispose { LauncherMode.setActive(false) }
+        }
+        val projector = rememberCarProjector(width, height, density, "gearslip-launcher") { CarUi() }
+        DisposableEffect(projector) {
+            CarKeys.focusSink = { code, down -> projector.dispatchKey(code, down) }
+            onDispose { CarKeys.focusSink = null }
+        }
+        CarFrame(projector, width, height, Modifier.fillMaxSize())
+    }
+}
+
+@Composable
+private fun InCarNotice(onOpenGearslip: () -> Unit) {
+    Column(
+        Modifier.fillMaxSize().background(MaterialTheme.colorScheme.background).padding(32.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        Text(
+            stringResource(R.string.launcher_in_car),
+            style = MaterialTheme.typography.titleLarge,
+            textAlign = TextAlign.Center,
+            color = MaterialTheme.colorScheme.onBackground,
+        )
+        Spacer(Modifier.height(16.dp))
+        Button(onClick = onOpenGearslip) { Text(stringResource(R.string.launcher_open_gearslip)) }
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/PermissionActivity.kt

@@ -0,0 +1,49 @@
+package app.seb3thehacker.gearslip
+
+import android.app.Activity
+import android.app.ActivityOptions
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.Display
+
+/**
+ * Asks for runtime permissions on the phone's own screen, for a car screen that can't show
+ * Android's dialog itself. It has no look of its own: the dialog appears, the answer is given,
+ * and it finishes.
+ */
+class PermissionActivity : Activity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val wanted = intent.getStringArrayExtra(EXTRA_PERMISSIONS)
+            ?.filter { checkSelfPermission(it) != android.content.pm.PackageManager.PERMISSION_GRANTED }
+            .orEmpty()
+        if (wanted.isEmpty() || savedInstanceState != null) {
+            if (wanted.isEmpty()) finish()
+            return
+        }
+        requestPermissions(wanted.toTypedArray(), REQUEST)
+    }
+
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        GearslipLog.i("permissions: ${permissions.zip(grantResults.toList()).joinToString { (p, r) -> "${p.substringAfterLast('.')}=${r == 0}" }}")
+        finish()
+    }
+
+    companion object {
+        private const val EXTRA_PERMISSIONS = "permissions"
+        private const val REQUEST = 1
+
+        /** Shows the permission dialog on the phone, whichever screen [context] belongs to. */
+        fun ask(context: Context, permissions: Array<String>) {
+            val intent = Intent(context, PermissionActivity::class.java)
+                .putExtra(EXTRA_PERMISSIONS, permissions)
+                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            val options = ActivityOptions.makeBasic().setLaunchDisplayId(Display.DEFAULT_DISPLAY)
+            runCatching { context.startActivity(intent, options.toBundle()) }
+                .onFailure { GearslipLog.w("permissions: could not ask on the phone: ${it.message}") }
+        }
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/PhoneIcons.kt

@@ -0,0 +1,34 @@
+package app.seb3thehacker.gearslip
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import java.io.ByteArrayOutputStream
+
+/**
+ * Gearslip's own icon as the PNGs a phone hands the car in its ServiceDiscoveryRequest, at the
+ * 32, 64 and 128 px a real phone sends. Cars draw the phone's tile on their home screen from
+ * them, and older head units may wait for them before answering at all.
+ */
+object PhoneIcons {
+
+    private val SIZES = intArrayOf(32, 64, 128)
+
+    @Volatile private var cached: List<ByteArray>? = null
+
+    /** The three PNGs, smallest first; empty if the icon can't be drawn. */
+    fun pngs(context: Context): List<ByteArray> = cached ?: runCatching {
+        val icon = context.packageManager.getApplicationIcon(context.applicationInfo).mutate()
+        SIZES.map { size ->
+            val bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888)
+            icon.setBounds(0, 0, size, size)
+            icon.draw(Canvas(bitmap))
+            val png = ByteArrayOutputStream()
+            bitmap.compress(Bitmap.CompressFormat.PNG, 100, png)
+            bitmap.recycle()
+            png.toByteArray()
+        }
+    }.onFailure { GearslipLog.w("phone icons: couldn't draw them (${it.message})") }
+        .getOrDefault(emptyList())
+        .also { if (it.isNotEmpty()) cached = it }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/PhoneTls.kt

@@ -1,5 +1,6 @@
 package app.seb3thehacker.gearslip
 
+import java.io.ByteArrayOutputStream
 import java.net.Socket
 import java.nio.ByteBuffer
 import java.security.KeyStore
@@ -11,23 +12,10 @@ import javax.net.ssl.SSLEngine
 import javax.net.ssl.SSLEngineResult
 import javax.net.ssl.SSLEngineResult.HandshakeStatus
 import javax.net.ssl.SSLPeerUnverifiedException
+import javax.net.ssl.SSLException
 import javax.net.ssl.X509ExtendedTrustManager
 
-/**
- * The phone end of the Android Auto TLS session.
- *
- * Two things here are the opposite of what aasdk does, because aasdk implements the head
- * unit and the head unit is the TLS *client*: it calls TLS_client_method() and
- * SSL_set_connect_state (src/Transport/SSLWrapper.cpp:97-140, src/Messenger/Cryptor.cpp:87),
- * and SSL_set_accept_state appears nowhere in that codebase. So the phone is the TLS
- * **server** and its certificate goes out as the server certificate - sent unconditionally
- * on every handshake, which is precisely what we are testing.
- *
- * TLS here is not layered over the socket: handshake bytes travel inside
- * MESSAGE_ENCAPSULATED_SSL control messages (id 3). That rules out SSLSocket and makes
- * SSLEngine - a buffer-to-buffer engine, the JSSE counterpart of aasdk's memory BIO pair -
- * the right tool.
- */
+/** TLS server for projection. Handshake records travel in control message 3, not a TLS socket. */
 class PhoneTls(keyStore: KeyStore, password: CharArray) {
     private val log = GearslipLog.tagged("TLS")
 
@@ -36,7 +24,7 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
     private var appBuffer = ByteBuffer.allocate(32 * 1024)
     private var netBuffer = ByteBuffer.allocate(32 * 1024)
 
-    var handshakeComplete: Boolean = false
+    @Volatile var handshakeComplete: Boolean = false
         private set
 
     init {
@@ -52,6 +40,7 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
             useClientMode = false
             // want, not need: we ask the head unit for its certificate so the run also tells
             // us what real units present, but we never make the session depend on getting one.
+            // Homemade head units may have none.
             wantClientAuth = true
             enabledProtocols = arrayOf("TLSv1.2") // aasdk pins TLS 1.2
         }
@@ -88,7 +77,7 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
                     if (netBuffer.hasRemaining()) {
                         outgoing += ByteArray(netBuffer.remaining()).also { netBuffer.get(it) }
                     }
-                    if (result.status == SSLEngineResult.Status.CLOSED) break@loop
+                    if (result.status == SSLEngineResult.Status.CLOSED) throw SSLException("TLS closed during handshake")
                 }
 
                 HandshakeStatus.NEED_UNWRAP -> {
@@ -100,7 +89,7 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
                             appBuffer = ByteBuffer.allocate(appBuffer.capacity() * 2)
                             continue@loop
                         }
-                        SSLEngineResult.Status.CLOSED -> break@loop
+                        SSLEngineResult.Status.CLOSED -> throw SSLException("TLS closed during handshake")
                         else -> Unit
                     }
                 }
@@ -124,7 +113,7 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
     /** Wraps a control-channel payload for an ENCRYPTED frame. */
     fun encrypt(plain: ByteArray): ByteArray {
         val source = ByteBuffer.wrap(plain)
-        val out = java.io.ByteArrayOutputStream()
+        val out = ByteArrayOutputStream()
         while (source.hasRemaining()) {
             netBuffer.clear()
             val result = engine.wrap(source, netBuffer)
@@ -132,6 +121,9 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
                 netBuffer = ByteBuffer.allocate(netBuffer.capacity() * 2)
                 continue
             }
+            if (result.status != SSLEngineResult.Status.OK || result.bytesConsumed() == 0) {
+                throw SSLException("TLS could not encrypt application data: ${result.status}")
+            }
             netBuffer.flip()
             val chunk = ByteArray(netBuffer.remaining())
             netBuffer.get(chunk)
@@ -140,14 +132,10 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
         return out.toByteArray()
     }
 
-    /**
-     * Unwraps one ENCRYPTED frame's payload. aasdk decrypts per frame
-     * (MessageOutStream::compoundFrame encrypts per frame), so each frame's payload is
-     * self-contained ciphertext.
-     */
+    /** Each encrypted projection frame contains complete TLS records. */
     fun decrypt(cipher: ByteArray): ByteArray {
         val source = ByteBuffer.wrap(cipher)
-        val out = java.io.ByteArrayOutputStream()
+        val out = ByteArrayOutputStream()
         while (source.hasRemaining()) {
             appBuffer.clear()
             val result = engine.unwrap(source, appBuffer)
@@ -157,10 +145,9 @@ class PhoneTls(keyStore: KeyStore, password: CharArray) {
                     continue
                 }
                 SSLEngineResult.Status.BUFFER_UNDERFLOW -> {
-                    log.w("decrypt: record split across frames (${source.remaining()} bytes left over)")
-                    break
+                    throw SSLException("Incomplete TLS record in an encrypted frame")
                 }
-                SSLEngineResult.Status.CLOSED -> break
+                SSLEngineResult.Status.CLOSED -> throw SSLException("TLS peer closed the connection")
                 else -> Unit
             }
             appBuffer.flip()

gearslip/src/main/java/app/seb3thehacker/gearslip/Projection.kt

@@ -24,6 +24,12 @@ interface Projection {
     fun onTouch(action: Int, actionIndex: Int, points: List<TouchPoint>)
 
     fun onProjectionStopped()
+
+    /**
+     * The screen has been still for a moment and the encoder has sent nothing since. Draw it once
+     * more, so the car gets a fresh frame (see [VideoSource]'s onStill).
+     */
+    fun onStill() {}
 }
 
 /** One finger on the car's screen: a stable [id] for as long as it stays down, and where it is. */

gearslip/src/main/java/app/seb3thehacker/gearslip/Protobuf.kt

@@ -2,14 +2,7 @@ package app.seb3thehacker.gearslip
 
 import java.io.ByteArrayOutputStream
 
-/**
- * Just enough protobuf to run the spike, hand-rolled so there is no protoc step.
- *
- * Only three messages are ever written (AuthResponse is only read):
- *   ServiceDiscoveryRequest { optional string label_text = 4; optional string device_name = 5; }
- *   PingResponse            { required int64 timestamp = 1; }
- *   AuthResponse            { required int32 status = 1; }
- */
+/** Protobuf field encoding and diagnostic rendering for the projection protocol. */
 object Protobuf {
 
     fun varint(value: Long): ByteArray {
@@ -41,29 +34,7 @@ object Protobuf {
     fun readInt32Field(data: ByteArray, field: Int): Int? = readInt64Field(data, field)?.toInt()
 
     /** Reads a varint field whole, for int64s such as a ping's timestamp. */
-    fun readInt64Field(data: ByteArray, field: Int): Long? {
-        var pos = 0
-        while (pos < data.size) {
-            val (tag, afterTag) = readVarint(data, pos) ?: return null
-            pos = afterTag
-            val number = (tag ushr 3).toInt()
-            when ((tag and 7L).toInt()) {
-                0 -> {
-                    val (value, afterValue) = readVarint(data, pos) ?: return null
-                    pos = afterValue
-                    if (number == field) return value
-                }
-                2 -> {
-                    val (len, afterLen) = readVarint(data, pos) ?: return null
-                    pos = afterLen + len.toInt()
-                }
-                5 -> pos += 4
-                1 -> pos += 8
-                else -> return null
-            }
-        }
-        return null
-    }
+    fun readInt64Field(data: ByteArray, field: Int): Long? = Wire.varint(Wire.fields(data), field)
 
     /**
      * Shallow field dump. Used on ServiceDiscoveryResponse: its make/model/year strings
@@ -71,6 +42,7 @@ object Protobuf {
      * proof that the session is live and we are decrypting correctly.
      */
     fun describe(data: ByteArray, indent: String = "  "): String {
+        if (indent.length > 32) return "$indent(nested message)\n"
         val sb = StringBuilder()
         var pos = 0
         while (pos < data.size) {
@@ -89,6 +61,7 @@ object Protobuf {
                 }
                 2 -> {
                     val (len, afterLen) = readVarint(data, pos) ?: break
+                    if (len < 0 || len > data.size - afterLen) break
                     val end = afterLen + len.toInt()
                     if (end > data.size) break
                     val body = data.copyOfRange(afterLen, end)
@@ -117,6 +90,7 @@ object Protobuf {
         var pos = start
         while (pos < data.size && shift <= 63) {
             val b = data[pos].toInt() and 0xFF
+            if (shift == 63 && b > 1) return null
             result = result or ((b and 0x7F).toLong() shl shift)
             pos++
             if (b and 0x80 == 0) return result to pos
@@ -135,45 +109,68 @@ object Wire {
         val out = mutableListOf<Field>()
         var pos = 0
         while (pos < data.size) {
-            val tag = readVarint(data, pos) ?: break
+            val tag = readVarint(data, pos) ?: return emptyList()
             pos = tag.second
             val number = (tag.first ushr 3).toInt()
+            if (tag.first ushr 3 !in 1..0x1fff_ffffL) return emptyList()
             when ((tag.first and 7L).toInt()) {
                 0 -> {
-                    val v = readVarint(data, pos) ?: break
+                    val v = readVarint(data, pos) ?: return emptyList()
                     pos = v.second
                     out += Field(number, 0, v.first, null)
                 }
-                1 -> { if (pos + 8 > data.size) break; pos += 8 }
+                1 -> { if (data.size - pos < 8) return emptyList(); pos += 8 }
                 2 -> {
-                    val len = readVarint(data, pos) ?: break
+                    val len = readVarint(data, pos) ?: return emptyList()
+                    if (len.first < 0 || len.first > data.size - len.second) return emptyList()
                     val end = len.second + len.first.toInt()
-                    if (end > data.size || end < len.second) break
+                    if (end > data.size || end < len.second) return emptyList()
                     out += Field(number, 2, 0, data.copyOfRange(len.second, end))
                     pos = end
                 }
-                5 -> { if (pos + 4 > data.size) break; pos += 4 }
-                else -> break
+                5 -> { if (data.size - pos < 4) return emptyList(); pos += 4 }
+                else -> return emptyList()
             }
         }
         return out
     }
 
     fun varint(fields: List<Field>, number: Int): Long? =
-        fields.firstOrNull { it.number == number && it.wireType == 0 }?.varint
+        fields.lastOrNull { it.number == number && it.wireType == 0 }?.varint
 
     fun bytes(fields: List<Field>, number: Int): ByteArray? =
-        fields.firstOrNull { it.number == number && it.wireType == 2 }?.bytes
+        fields.lastOrNull { it.number == number && it.wireType == 2 }?.bytes
 
     fun allBytes(fields: List<Field>, number: Int): List<ByteArray> =
         fields.filter { it.number == number && it.wireType == 2 }.mapNotNull { it.bytes }
 
+    /** Protobuf readers accept both packed and unpacked repeated numeric fields. */
+    fun repeatedInts(fields: List<Field>, number: Int): List<Int> =
+        repeatedLongs(fields, number)?.map(Long::toInt).orEmpty()
+
+    /** Null means a packed field contained an incomplete or overflowing varint. */
+    fun repeatedLongs(fields: List<Field>, number: Int): List<Long>? = buildList {
+        for (field in fields.filter { it.number == number }) {
+            if (field.wireType == 0) add(field.varint)
+            else if (field.wireType == 2) {
+                val bytes = field.bytes ?: continue
+                var position = 0
+                while (position < bytes.size) {
+                    val (value, next) = readVarint(bytes, position) ?: return null
+                    add(value)
+                    position = next
+                }
+            }
+        }
+    }
+
     private fun readVarint(data: ByteArray, start: Int): Pair<Long, Int>? {
         var result = 0L
         var shift = 0
         var pos = start
         while (pos < data.size && shift <= 63) {
             val b = data[pos].toInt() and 0xFF
+            if (shift == 63 && b > 1) return null
             result = result or ((b and 0x7F).toLong() shl shift)
             pos++
             if (b and 0x80 == 0) return result to pos

gearslip/src/main/java/app/seb3thehacker/gearslip/ProtocolVersion.kt

@@ -0,0 +1,17 @@
+package app.seb3thehacker.gearslip
+
+/**
+ * Advertises our supported 1.x version, as Android Auto does for older head units. Head units that
+ * offer a newer major version (LIVI asks for 6.1, a RAV4 and the DHU for 4.2) still accept a 1.x
+ * answer, so only a major version of 0 is refused.
+ */
+internal object ProtocolVersion {
+    data class Response(val major: Int, val minor: Int, val supported: Boolean) {
+        val bytes: ByteArray get() = byteArrayOf(
+            (major ushr 8).toByte(), major.toByte(), (minor ushr 8).toByte(), minor.toByte(),
+            if (supported) 0 else -1, if (supported) 0 else -1,
+        )
+    }
+
+    fun respond(major: Int, minor: Int): Response = Response(1, 7, major >= 1 && minor in 0..0xffff)
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/ScreenProjector.kt

@@ -51,7 +51,7 @@ class ScreenProjector(private val context: Context) {
      * preview passes "gearslip-preview".
      */
     fun start(
-        surface: Surface,
+        surface: Surface?,
         width: Int,
         height: Int,
         densityDpi: Int,
@@ -219,6 +219,19 @@ class ScreenProjector(private val context: Context) {
         target.dispatchKeyEvent(event)
     }
 
+    /**
+     * Points the display at another surface, or none, without restarting what it shows. The
+     * preview's SurfaceView comes and goes as the phone turns; the car UI on it carries on.
+     */
+    /** Draws the screen again as it is, which hands the display's consumer a new frame. */
+    fun redraw() {
+        root?.let { it.post { it.invalidate() } }
+    }
+
+    fun setSurface(surface: Surface?) {
+        virtualDisplay?.surface = surface
+    }
+
     fun stop() {
         runCatching { presentation?.dismiss() }
         runCatching { owner?.destroy() }

gearslip/src/main/java/app/seb3thehacker/gearslip/ServiceDiscovery.kt

@@ -51,8 +51,17 @@ object ServiceDiscovery {
             "$resolutionName @ $frameRateName, density=$density, margin=${widthMargin}x$heightMargin"
     }
 
-    /** [displayId] is MediaSinkService field 6: 0, the default, is the main screen. */
-    class VideoService(val serviceId: Int, val codecType: Int, val configs: List<VideoConfig>, val displayId: Int = 0) {
+    /**
+     * [displayId] is MediaSinkService field 6: 0, the default, is the main screen. [displayType]
+     * is field 7 (0 main, 1 instrument cluster, 2 auxiliary), or null when the car leaves it out.
+     */
+    class VideoService(
+        val serviceId: Int,
+        val codecType: Int,
+        val configs: List<VideoConfig>,
+        val displayId: Int = 0,
+        val displayType: Int? = null,
+    ) {
         val codecName: String get() = CODECS[codecType] ?: "unknown($codecType)"
     }
 
@@ -76,7 +85,7 @@ object ServiceDiscovery {
     fun findAudioServices(response: ByteArray): List<AudioService> = buildList {
         for (channel in Wire.allBytes(Wire.fields(response), 1)) {
             val service = Wire.fields(channel)
-            val id = Wire.varint(service, 1)?.toInt() ?: continue
+            val id = serviceId(service) ?: continue
             val sink = Wire.bytes(service, 3) ?: continue
             val sinkFields = Wire.fields(sink)
             val audioConfigs = Wire.allBytes(sinkFields, 3)
@@ -116,13 +125,32 @@ object ServiceDiscovery {
      */
     fun findMediaStatusChannel(response: ByteArray): Int? = findChannelWith(response, 9)
 
-    /** The instrument cluster's turn-by-turn channel (NavigationStatusService, Service field 8). */
-    fun findNavStatusChannel(response: ByteArray): Int? = findChannelWith(response, 8)
+    /**
+     * The channel the car takes call status on (PhoneStatusService, Service field 10), for its
+     * cluster and phone screens. It carries no settings. Null when the car has none.
+     */
+    fun findPhoneStatusChannel(response: ByteArray): Int? = findChannelWith(response, 10)
+
+    class NavStatusService(val serviceId: Int, val minimumIntervalMs: Int)
+
+    /** The cluster advertises its minimum update interval in NavigationStatusService field 1. */
+    fun findNavStatusService(response: ByteArray): NavStatusService? =
+        Wire.allBytes(Wire.fields(response), 1).firstNotNullOfOrNull { channel ->
+            val service = Wire.fields(channel)
+            val id = serviceId(service) ?: return@firstNotNullOfOrNull null
+            val navigation = Wire.bytes(service, 8) ?: return@firstNotNullOfOrNull null
+            val interval = Wire.varint(Wire.fields(navigation), 1) ?: return@firstNotNullOfOrNull null
+            if (interval !in 0L..Int.MAX_VALUE.toLong()) return@firstNotNullOfOrNull null
+            NavStatusService(id, interval.toInt())
+        }
+
+    private fun serviceId(fields: List<Wire.Field>): Int? =
+        Wire.varint(fields, 1)?.takeIf { it in 1L..255L }?.toInt()
 
     private fun findChannelWith(response: ByteArray, serviceField: Int): Int? =
         Wire.allBytes(Wire.fields(response), 1).firstNotNullOfOrNull { channel ->
             val service = Wire.fields(channel)
-            if (service.any { it.number == serviceField }) Wire.varint(service, 1)?.toInt() else null
+            if (Wire.bytes(service, serviceField) != null) serviceId(service) else null
         }
 
     /**
@@ -134,7 +162,7 @@ object ServiceDiscovery {
     fun findMicService(response: ByteArray): AudioService? {
         for (channel in Wire.allBytes(Wire.fields(response), 1)) {
             val service = Wire.fields(channel)
-            val id = Wire.varint(service, 1)?.toInt() ?: continue
+            val id = serviceId(service) ?: continue
             val source = Wire.fields(Wire.bytes(service, 5) ?: continue)
             val f = Wire.fields(Wire.bytes(source, 2) ?: continue)
             return AudioService(
@@ -179,9 +207,7 @@ object ServiceDiscovery {
             val fields = Wire.fields(Wire.bytes(service, 6) ?: continue)
             val address = Wire.bytes(fields, 1)?.let { String(it, Charsets.UTF_8) } ?: continue
             // Packed as declared, though a car may send each method as its own varint.
-            val methods = fields.filter { it.number == 2 }.flatMap { f ->
-                f.bytes?.let(::packedVarints) ?: listOf(f.varint.toInt())
-            }
+            val methods = Wire.repeatedInts(fields, 2)
             return BluetoothService(id, address, methods)
         }
         return null
@@ -215,8 +241,8 @@ object ServiceDiscovery {
      *                         repeated TouchScreen touchscreen = 2; ... }
      *   TouchScreen { required int32 width = 1; required int32 height = 2; type = 3; }
      *
-     * Touch coordinates arrive in this space (1258x708 on the 2018 Uconnect) and must be
-     * scaled to the projected video size before injection. [keycodesSupported] is what the
+     * Touch reports use projected video coordinates; these dimensions describe the input
+     * hardware and help select a video configuration. [keycodesSupported] is what the
      * head unit says it will actually send over the Input channel as key events (steering-wheel
      * buttons, etc.) - not every unit reports the same set, so it's kept for diagnostics and to
      * know ahead of time whether a button like voice/PTT is even wired up on this hardware.
@@ -245,38 +271,18 @@ object ServiceDiscovery {
     private fun inputServices(response: ByteArray): List<InputService> = buildList {
         for (channel in Wire.allBytes(Wire.fields(response), 1)) {
             val service = Wire.fields(channel)
-            val id = Wire.varint(service, 1)?.toInt() ?: continue
+            val id = serviceId(service) ?: continue
             val input = Wire.bytes(service, 4) ?: continue
             val inputFields = Wire.fields(input)
             // A unit with only a knob and buttons has no touchscreen entry; it still has keys.
             val touchFields = Wire.bytes(inputFields, 2)?.let { Wire.fields(it) }.orEmpty()
             val width = Wire.varint(touchFields, 1)?.toInt() ?: 0
             val height = Wire.varint(touchFields, 2)?.toInt() ?: 0
-            // Declared packed, but some units send each keycode as its own field.
-            val keycodes = inputFields.filter { it.number == 1 }.flatMap { f ->
-                f.bytes?.let(::packedVarints) ?: listOf(f.varint.toInt())
-            }
+            val keycodes = Wire.repeatedInts(inputFields, 1)
             add(InputService(id, width, height, keycodes, Wire.varint(inputFields, 5)?.toInt() ?: 0))
         }
     }
 
-    /** Decodes a `[packed=true]` repeated varint field's raw bytes into individual values. */
-    private fun packedVarints(data: ByteArray): List<Int> = buildList {
-        var pos = 0
-        while (pos < data.size) {
-            var result = 0L
-            var shift = 0
-            while (pos < data.size) {
-                val b = data[pos].toInt() and 0xFF
-                result = result or ((b and 0x7F).toLong() shl shift)
-                pos++
-                if (b and 0x80 == 0) break
-                shift += 7
-            }
-            add(result.toInt())
-        }
-    }
-
     /**
      * The main screen's video sink. A head unit with a second screen, such as LIVI with a
      * cluster display, offers a sink for each; the one without a display id (0) is the main one.
@@ -286,10 +292,23 @@ object ServiceDiscovery {
         return sinks.firstOrNull { it.displayId == 0 } ?: sinks.firstOrNull()
     }
 
+    /**
+     * The instrument cluster's video sink: one marked as a cluster, or, from a car that marks
+     * none, a second sink beside the main screen's. Null when the car has no cluster screen.
+     */
+    fun findClusterVideoService(response: ByteArray): VideoService? {
+        val sinks = videoServices(response)
+        val main = findVideoService(response) ?: return null
+        return sinks.firstOrNull { it.displayType == DISPLAY_TYPE_CLUSTER && it.serviceId != main.serviceId }
+            ?: sinks.firstOrNull { it.displayType == null && it.serviceId != main.serviceId && it.displayId != main.displayId }
+    }
+
+    private const val DISPLAY_TYPE_CLUSTER = 1
+
     private fun videoServices(response: ByteArray): List<VideoService> = buildList {
         for (channel in Wire.allBytes(Wire.fields(response), 1)) {
             val service = Wire.fields(channel)
-            val id = Wire.varint(service, 1)?.toInt() ?: continue
+            val id = serviceId(service) ?: continue
             val sink = Wire.bytes(service, 3) ?: continue
 
             val sinkFields = Wire.fields(sink)
@@ -307,7 +326,7 @@ object ServiceDiscovery {
                     heightMargin = Wire.varint(f, 4)?.toInt() ?: 0,
                 )
             }
-            add(VideoService(id, codecType, configs, Wire.varint(sinkFields, 6)?.toInt() ?: 0))
+            add(VideoService(id, codecType, configs, Wire.varint(sinkFields, 6)?.toInt() ?: 0, Wire.varint(sinkFields, 7)?.toInt()))
         }
     }
 
@@ -316,16 +335,15 @@ object ServiceDiscovery {
      *   SensorSourceService { repeated Sensor sensors = 1; }
      *   Sensor { required SensorType sensor_type = 1; }
      *
-     * Field numbers for what actually rides inside each SensorEvent once subscribed are not
-     * pinned down here - unlike video/audio/input, there's no independent source to check them
-     * against, so [CarSensors] shows the raw decode instead of trusting a guessed field map.
+     * SensorBatch contains repeated messages in fields 1 through 22 matching these type ids.
+     * The vehicle data screen keeps their raw contents for diagnostics.
      */
     class SensorService(val serviceId: Int, val types: List<Int>)
 
     fun findSensorService(response: ByteArray): SensorService? {
         for (channel in Wire.allBytes(Wire.fields(response), 1)) {
             val service = Wire.fields(channel)
-            val id = Wire.varint(service, 1)?.toInt() ?: continue
+            val id = serviceId(service) ?: continue
             val sensorSource = Wire.bytes(service, 2) ?: continue
             val types = Wire.allBytes(Wire.fields(sensorSource), 1).mapNotNull {
                 Wire.varint(Wire.fields(it), 1)?.toInt()

gearslip/src/main/java/app/seb3thehacker/gearslip/SessionReport.kt

@@ -18,6 +18,7 @@ object SessionReport {
     enum class Category(val label: String) {
         NONE("none"),
         USB("USB transport"),
+        WIFI("Wi-Fi transport"),
         NO_HANDSHAKE("head unit never started talking"),
         TLS("TLS handshake failed"),
         CERTIFICATE("certificate rejected by the head unit"),
@@ -218,7 +219,7 @@ object SessionReport {
             // switching the car off at the end shows up as a USB or ByeBye "failure" that isn't one.
             val reached = carScreen.isNotEmpty()
             val outcome = when {
-                reached && category in setOf(Category.NONE, Category.USB, Category.BYEBYE) -> "connected"
+                reached && category in setOf(Category.NONE, Category.USB, Category.WIFI, Category.BYEBYE) -> "connected"
                 reached -> "connected, then ${category.label}"
                 category == Category.NONE -> "ended before video"
                 else -> category.label

gearslip/src/main/java/app/seb3thehacker/gearslip/SessionStatus.kt

@@ -14,7 +14,10 @@ object SessionStatus {
 
     enum class Phase { IDLE, CONNECTING, PROJECTING, FAILED, DISCONNECTED }
 
-    data class Snapshot(val phase: Phase, val headline: String, val detail: String)
+    /** [stuckOn] is set when connecting has gone on too long: the cable or Wi-Fi, for what to try. */
+    data class Snapshot(val phase: Phase, val headline: String, val detail: String, val stuckOn: Link? = null)
+
+    enum class Link { CABLE, WIRELESS }
 
     private val flow = MutableStateFlow(
         Snapshot(
@@ -30,6 +33,12 @@ object SessionStatus {
         flow.value = Snapshot(Phase.CONNECTING, "Connecting", stage)
     }
 
+    /** Still connecting after [GearslipRunner]'s patience ran out: Home says what to try. */
+    fun stillConnecting(link: Link) {
+        val now = flow.value
+        if (now.phase == Phase.CONNECTING) flow.value = now.copy(stuckOn = link)
+    }
+
     fun projecting() {
         flow.value = Snapshot(Phase.PROJECTING, "Projecting", "Streaming to the head unit.")
     }

gearslip/src/main/java/app/seb3thehacker/gearslip/VideoSource.kt

@@ -27,6 +27,12 @@ class VideoSource(
     private val wireless: Boolean = false,
     private val onCodecConfig: (ByteArray) -> Unit,
     private val onFrame: (data: ByteArray, presentationTimeUs: Long, keyFrame: Boolean) -> Unit,
+    /**
+     * SURFACE mode, nothing encoded for [STILL_MS]. The repeat setting below should cover a still
+     * screen, but on a Pixel 10 it didn't: a LuChi box got 11 frames, then none, and stayed black
+     * (issue #58). Whoever draws the screen can draw it again, and that is a frame.
+     */
+    private val onStill: () -> Unit = {},
 ) {
     private val log = GearslipLog.tagged("VIDEO")
 
@@ -42,6 +48,14 @@ class VideoSource(
         private set
 
     private var codec: MediaCodec? = null
+
+    /** The bitrate the encoder started at, the most [setBitRate] ever goes back up to. */
+    var fullBitRate = 0
+        private set
+
+    /** What the encoder is asked for right now. */
+    @Volatile var bitRate = 0
+        private set
     private var worker: Thread? = null
     @Volatile private var running = false
     private var frameIndex = 0L
@@ -51,6 +65,8 @@ class VideoSource(
         val bitRate = defaultBitRate(width, height, frameRate, level).let {
             if (wireless) (it * WIRELESS_SHARE).toInt().coerceAtMost(WIRELESS_MAX_BIT_RATE) else it
         }
+        fullBitRate = bitRate
+        this.bitRate = bitRate
         fun format(tuned: Boolean) = MediaFormat.createVideoFormat(MIME, width, height).apply {
             setInteger(
                 MediaFormat.KEY_COLOR_FORMAT,
@@ -128,9 +144,28 @@ class VideoSource(
         }.onFailure { log.w("requestSyncFrame failed: ${it.message}") }
     }
 
+    /**
+     * Changes the bitrate while streaming, without a new keyframe or a restart. Used to back off
+     * when the car (or the Wi-Fi to it) can't keep up, and to climb back once it can.
+     */
+    fun setBitRate(bps: Int) {
+        val target = bps.coerceIn(fullBitRate / 4, fullBitRate)
+        if (target == bitRate) return
+        runCatching {
+            codec?.setParameters(Bundle().apply { putInt(MediaCodec.PARAMETER_KEY_VIDEO_BITRATE, target) })
+            bitRate = target
+        }.onFailure { log.w("setBitRate failed: ${it.message}") }
+    }
+
     fun stop() {
         running = false
-        worker?.join(1_000)
+        // Stop is called from threads that are themselves being shut down. An interrupt here
+        // used to escape as an uncaught exception and take the whole app down with the session.
+        try {
+            worker?.join(1_000)
+        } catch (e: InterruptedException) {
+            Thread.currentThread().interrupt()
+        }
         runCatching { inputSurface?.release() }
         inputSurface = null
         runCatching { codec?.stop() }
@@ -141,6 +176,8 @@ class VideoSource(
     private fun pump(encoder: MediaCodec) {
         val info = MediaCodec.BufferInfo()
         val frameIntervalUs = 1_000_000L / frameRate
+        var lastOutputAt = 0L
+        var lastNudgeAt = 0L
 
         while (running) {
             // SURFACE mode has no input buffers to fill - frames arrive from the display.
@@ -179,8 +216,16 @@ class VideoSource(
                     }
                 }
                 encoder.releaseOutputBuffer(outIndex, false)
+                lastOutputAt = System.currentTimeMillis()
                 outIndex = encoder.dequeueOutputBuffer(info, 0)
             }
+            if (mode == Mode.SURFACE && lastOutputAt > 0) {
+                val now = System.currentTimeMillis()
+                if (now - lastOutputAt > STILL_MS && now - lastNudgeAt > STILL_MS) {
+                    lastNudgeAt = now
+                    onStill()
+                }
+            }
 
             if (mode != Mode.SURFACE) Thread.sleep(maxOf(1L, frameIntervalUs / 2000))
         }
@@ -227,6 +272,7 @@ class VideoSource(
         const val MIME = MediaFormat.MIMETYPE_VIDEO_AVC
         const val TIMEOUT_US = 10_000L
         const val SURFACE_TIMEOUT_US = 100_000L
+        private const val STILL_MS = 1_000L
 
         /**
          * 800x480 at 30fps gets 8 Mbps: about the most that size can show, enough that a moving

gearslip/src/main/java/app/seb3thehacker/gearslip/audio/AacEncoder.kt

@@ -87,8 +87,17 @@ internal class AacEncoder(private val sampleRate: Int, private val channels: Int
         runCatching { codec.release() }
     }
 
-    private companion object {
-        const val INPUT_WAIT_US = 10_000L
-        val FREQUENCIES = listOf(96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350)
+    companion object {
+        private const val INPUT_WAIT_US = 10_000L
+        private val FREQUENCIES = listOf(96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350)
+
+        /** The two-byte AudioSpecificConfig for AAC-LC: object type 2, rate index, channel count. */
+        fun audioSpecificConfig(sampleRate: Int, channels: Int): ByteArray {
+            val freq = FREQUENCIES.indexOf(sampleRate).let { if (it < 0) 3 else it }
+            return byteArrayOf(
+                ((2 shl 3) or (freq shr 1)).toByte(),
+                (((freq and 1) shl 7) or (channels shl 3)).toByte(),
+            )
+        }
     }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/audio/AudioLink.kt

@@ -4,6 +4,8 @@ import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.Protobuf
 import app.seb3thehacker.gearslip.ServiceDiscovery
 import app.seb3thehacker.gearslip.Wire
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
 
 /**
  * The phone end of the head unit's media audio sink, the audio twin of the video channel:
@@ -25,12 +27,18 @@ class AudioLink(
     /** Log name: "audio" for the media sink, "guidance" for the directions sink. */
     private val tag: String = "audio",
     private val sessionId: Int = SESSION_ID,
-    /** Media asks the car for focus; directions just start, and the car ducks music under them. */
+    /**
+     * Media asks the car for focus when it starts. Directions ask only around each announcement,
+     * through [askForSpeakers], and only when the music isn't already ours.
+     */
     private val asksFocus: Boolean = true,
     private val onReady: (AudioLink) -> Unit = { CarAudio.attach(it) },
     private val onClose: (AudioLink) -> Unit = { CarAudio.detach(it) },
     /** The car took the sound back after giving it, as when the driver switches to the radio. */
     private val onTakenBack: () -> Unit = {},
+    /** The car wants the speakers for a moment (a call, its own voice), and then [onGivenBack]. */
+    private val onPausedForNow: () -> Unit = {},
+    private val onGivenBack: () -> Unit = {},
 ) : CarAudio.Link {
 
     private var configIndex = 0
@@ -38,6 +46,8 @@ class AudioLink(
     @Volatile private var started = false
     @Volatile private var focusGranted = false
     @Volatile private var focusRequested = false
+    /** The car took the speakers for a moment, and we paused the phone's music until it's done. */
+    @Volatile private var pausedForNow = false
     @Volatile private var inFlight = 0
     // The Uconnect asks for 4 on its video channel; assume the same until its Config says otherwise.
     @Volatile private var maxUnacked = 4
@@ -47,6 +57,10 @@ class AudioLink(
     private var bytes = 0L
     private var dropped = 0
     @Volatile private var configTimer: Thread? = null
+    /** Underflows the car reported this drive, and the silence still to slip in ahead of the next chunk. */
+    private var underflows = 0
+    @Volatile private var padMs = 0
+    @Volatile private var pendingPadMs = 0
     private val ackLock = Object()
     /** Only for a sink that takes AAC and nothing else; PCM sinks get the capture as it is. */
     @Volatile private var aac: AacEncoder? = null
@@ -58,6 +72,65 @@ class AudioLink(
 
     val channelId get() = service.serviceId
 
+    /** Sending audio now, which for media means the car has handed us the speakers. */
+    val streaming get() = started
+
+    /** The car has set the sink up, so a stream can start. */
+    val isReady get() = ready
+
+    @Volatile private var holdsSpeakers = false
+    @Volatile private var focusAnswer: CountDownLatch? = null
+    @Volatile private var answerDueBy = 0L
+
+    /** True just after [askForSpeakers] or [handBackSpeakers], when the car's next focus answer is ours. */
+    fun expectsFocusAnswer() = System.currentTimeMillis() < answerDueBy
+
+    /**
+     * For directions when nothing of ours is playing, so the car's speakers belong to the radio
+     * or a Bluetooth phone. Android Auto asks for them before each announcement, letting the
+     * other source duck, and hands them back afterwards. Speaking without asking left a 2025
+     * Nissan's Bosch head unit rebooting mid-drive (issue #35).
+     *
+     * Waits briefly for the car's answer and speaks anyway without one, as some cars never answer.
+     */
+    fun askForSpeakers() {
+        if (holdsSpeakers) return
+        val answer = CountDownLatch(1)
+        focusAnswer = answer
+        answerDueBy = System.currentTimeMillis() + FOCUS_WAIT_MS
+        holdsSpeakers = true
+        sendControl(MSG_FOCUS_REQUEST, Protobuf.varintField(1, FOCUS_GAIN_TRANSIENT_MAY_DUCK.toLong()))
+        GearslipLog.i("$tag: -> AudioFocusRequest(GAIN_TRANSIENT_MAY_DUCK)")
+        if (!answer.await(FOCUS_WAIT_MS, TimeUnit.MILLISECONDS)) {
+            GearslipLog.i("$tag: no focus answer after ${FOCUS_WAIT_MS}ms - speaking anyway")
+        }
+        focusAnswer = null
+    }
+
+    /** Gives back what [askForSpeakers] took, so the other source comes back to full volume. */
+    fun handBackSpeakers() {
+        if (!holdsSpeakers) return
+        holdsSpeakers = false
+        answerDueBy = System.currentTimeMillis() + FOCUS_WAIT_MS
+        runCatching { sendControl(MSG_FOCUS_REQUEST, Protobuf.varintField(1, FOCUS_RELEASE.toLong())) }
+        GearslipLog.i("$tag: -> AudioFocusRequest(RELEASE)")
+    }
+
+    /**
+     * A spoken turn on the music channel while no music plays (see DirectionsVoice): the stream
+     * runs for the turn only, under ducking focus like the directions channel's, so the radio
+     * comes back after it rather than giving way to Android Auto for good.
+     */
+    fun startForTurn() {
+        askForSpeakers()
+        startStream()
+    }
+
+    fun stopForTurn() {
+        synchronized(startLock) { stopLocked(release = false) }
+        handBackSpeakers()
+    }
+
     fun opened(status: Int) {
         GearslipLog.i("$tag: <- ChannelOpenResponse: status=$status")
         if (status != 0) {
@@ -134,6 +207,8 @@ class AudioLink(
                 }
             }
 
+            MSG_UNDERFLOW -> onUnderflow()
+
             MSG_ACK -> {
                 val acked = Wire.varint(Wire.fields(body), 2)?.toInt() ?: 1
                 synchronized(ackLock) {
@@ -161,14 +236,63 @@ class AudioLink(
     fun onFocus(state: Int) {
         val name = FOCUS_STATES[state] ?: "unknown($state)"
         GearslipLog.i("$tag: <- AudioFocusResponse state=$name")
+        if (!asksFocus || expectsFocusAnswer()) {
+            // Directions speak whatever the answer: a lost turn is worse than a loud one.
+            answerDueBy = 0L
+            focusAnswer?.countDown()
+            return
+        }
         val had = focusGranted
         focusGranted = state == FOCUS_STATE_GAIN || state == FOCUS_STATE_GAIN_TRANSIENT ||
             state == FOCUS_STATE_GAIN_MEDIA_ONLY
-        if (focusGranted) startStream() else stop()
-        // A ducking request leaves the music playing; a loss means another source has the speakers.
-        if (had && (state == FOCUS_STATE_LOSS || state == FOCUS_STATE_LOSS_TRANSIENT)) onTakenBack()
+        when {
+            focusGranted -> {
+                startStream()
+                if (pausedForNow) {
+                    pausedForNow = false
+                    onGivenBack()
+                }
+            }
+            // A call or the car's own voice. Releasing focus here meant the car never handed it
+            // back, so the music stayed paused after the call: keep the claim and wait for GAIN.
+            state == FOCUS_STATE_LOSS_TRANSIENT -> {
+                synchronized(startLock) { stopLocked(release = false) }
+                if (had) {
+                    pausedForNow = true
+                    onPausedForNow()
+                }
+            }
+            else -> {
+                stop()
+                // A ducking request leaves the music playing; a loss means another source has the speakers.
+                if (state == FOCUS_STATE_LOSS && (had || pausedForNow)) {
+                    pausedForNow = false
+                    onTakenBack()
+                }
+            }
+        }
     }
 
+    /**
+     * The car ran out of sound to play (AudioUnderflowNotification, no body): its buffer emptied
+     * before the next chunk arrived, which the driver hears as a gap. Capture runs in real time, so
+     * the car's buffer only ever holds what the window lets through. A little silence slipped in
+     * ahead of the next chunk puts it that far ahead, so the next slow patch is soaked up rather
+     * than heard. Capped, as each step adds a little delay to the music.
+     */
+    private fun onUnderflow() {
+        underflows++
+        val step = if (started && padMs < MAX_PAD_MS) PAD_STEP_MS else 0
+        padMs += step
+        pendingPadMs += step
+        if (underflows <= 3 || underflows % 20 == 0) {
+            GearslipLog.w("$tag: <- AudioUnderflow ($underflows this drive) - running ${padMs}ms ahead now")
+        }
+    }
+
+    /** Silence for [ms], whole frames of this sink's format. */
+    private fun silence(ms: Int): ByteArray = ByteArray(sampleRate * ms / 1000 * channels * 2)
+
     override fun start() {
         if (!ready || started) return
         if (asksFocus && !focusRequested) {
@@ -181,12 +305,30 @@ class AudioLink(
         startStream()
     }
 
+    /**
+     * Guards starting and stopping. [start] starts the stream at once for head units that never
+     * answer the focus request, and the car's answer arrives on another thread and starts it
+     * too: without this both got through, so the car got Start twice and two AAC encoders, and a
+     * 2014 head unit dropped the connection on the first audio.
+     */
+    private val startLock = Any()
+
     private fun startStream() {
+        synchronized(startLock) { startStreamLocked() }
+    }
+
+    private fun startStreamLocked() {
         if (!ready || started) return
         sendOnChannel(
             MSG_START,
             Protobuf.varintField(1, sessionId.toLong()) + Protobuf.varintField(2, configIndex.toLong()),
         )
+        // Raw AAC-LC has no header of its own: the car needs the codec config before the first frame.
+        if (service.codecType == ServiceDiscovery.CODEC_AAC_LC) {
+            val asc = AacEncoder.audioSpecificConfig(sampleRate, channels)
+            sendOnChannel(MSG_CODEC_CONFIG, asc)
+            GearslipLog.hex("$tag: -> CodecConfig (AudioSpecificConfig)", asc)
+        }
         inFlight = 0
         lastAckAt = System.currentTimeMillis()
         if (aacSink && aac == null) {
@@ -200,24 +342,42 @@ class AudioLink(
     }
 
     override fun stop() {
+        synchronized(startLock) { stopLocked() }
+    }
+
+    /** [release] false keeps our claim on the speakers, so the car hands them back on its own. */
+    private fun stopLocked(release: Boolean = true) {
         if (!started) return
         started = false
         synchronized(ackLock) { ackLock.notifyAll() }
         runCatching {
             sendOnChannel(MSG_STOP, Protobuf.varintField(1, sessionId.toLong()))
-            if (focusRequested) sendControl(MSG_FOCUS_REQUEST, Protobuf.varintField(1, FOCUS_RELEASE.toLong()))
+            if (release && focusRequested) sendControl(MSG_FOCUS_REQUEST, Protobuf.varintField(1, FOCUS_RELEASE.toLong()))
         }
-        focusRequested = false
+        if (release) focusRequested = false
         focusGranted = false
         aac?.release()
         aac = null
-        GearslipLog.i("$tag: -> Stop, AudioFocusRequest(RELEASE) after $chunks chunks / $bytes bytes")
+        GearslipLog.i("$tag: -> Stop${if (release) ", AudioFocusRequest(RELEASE)" else ""} after $chunks chunks / $bytes bytes")
         chunks = 0
         bytes = 0
+        // A new stream starts with the car's buffer empty again: earn the lead back if it's needed.
+        padMs = 0
+        pendingPadMs = 0
     }
 
     override fun write(pcm: ByteArray, size: Int) {
         if (!started) return
+        val pad = pendingPadMs
+        if (pad > 0) {
+            pendingPadMs = 0
+            val quiet = silence(pad)
+            writeNow(quiet, quiet.size)
+        }
+        writeNow(pcm, size)
+    }
+
+    private fun writeNow(pcm: ByteArray, size: Int) {
         val encoder = aac
         if (encoder == null) {
             send(pcm.copyOf(size))
@@ -286,6 +446,7 @@ class AudioLink(
         configTimer?.interrupt()
         configTimer = null
         stop()
+        handBackSpeakers()
         ready = false
         onClose(this)
     }
@@ -295,15 +456,21 @@ class AudioLink(
         const val MSG_FOCUS_RESPONSE = 19
         private const val MSG_CHANNEL_OPEN_RESPONSE = 8
         private const val MSG_DATA = 0
+        private const val MSG_CODEC_CONFIG = 1
         private const val MSG_SETUP = 32768
         private const val MSG_START = 32769
         private const val MSG_STOP = 32770
         private const val MSG_CONFIG = 32771
         private const val MSG_ACK = 32772
         private const val MSG_SETUP_ANSWER = 255
+        private const val MSG_UNDERFLOW = 32779 // 0x800B, car to phone, no body
+        private const val PAD_STEP_MS = 60
+        private const val MAX_PAD_MS = 240
         private const val STATUS_READY = 2
         private const val FOCUS_GAIN = 1
+        private const val FOCUS_GAIN_TRANSIENT_MAY_DUCK = 3
         private const val FOCUS_RELEASE = 4
+        private const val FOCUS_WAIT_MS = 500L
         private const val FOCUS_STATE_GAIN = 1
         private const val FOCUS_STATE_GAIN_TRANSIENT = 2
         private const val FOCUS_STATE_GAIN_MEDIA_ONLY = 6

gearslip/src/main/java/app/seb3thehacker/gearslip/audio/CarAudio.kt

@@ -44,6 +44,9 @@ object CarAudio {
 
     @Volatile private var link: Link? = null
 
+    /** Opens the car's media channel, left closed while music went over Bluetooth; null once open. */
+    @Volatile var openSink: (() -> Unit)? = null
+
     /** Rate and channel count the capture should use: the car's, or a sensible default. */
     val sampleRate get() = link?.sampleRate ?: 48_000
     val channels get() = link?.channels ?: 2
@@ -71,6 +74,7 @@ object CarAudio {
         when (_capture.value) {
             Capture.ON, Capture.ASKING, Capture.DENIED -> return
             Capture.OFF -> if (link == null) {
+                openSink?.invoke()
                 GearslipLog.i("audio: waiting for the car to offer an audio sink")
             } else {
                 ask()
@@ -133,6 +137,59 @@ object CarAudio {
 
     internal fun deliver(pcm: ByteArray, size: Int, peak: Float) {
         _level.value = peak
-        link?.write(pcm, size)
+        val voice = synchronized(voiceLock) { spoken }
+        if (voice == null) link?.write(pcm, size) else link?.write(mixVoice(pcm, size), size)
     }
+
+    private val voiceLock = Any()
+    private var spoken: ByteArray? = null
+    private var spokenAt = 0
+    private var spokenDone: java.util.concurrent.CountDownLatch? = null
+
+    /**
+     * Mixes a spoken turn into the music from the next chunk on, with the music turned down
+     * under it, and waits until it has all gone out. [pcm] is 16-bit, in the sink's own format.
+     * False when no music is flowing to carry it, so the caller sends it some other way.
+     */
+    fun speakOverMusic(pcm: ByteArray): Boolean {
+        if (_capture.value != Capture.ON || (link as? AudioLink)?.streaming != true) return false
+        val done = java.util.concurrent.CountDownLatch(1)
+        synchronized(voiceLock) {
+            spokenDone?.countDown()
+            spoken = pcm
+            spokenAt = 0
+            spokenDone = done
+        }
+        val ms = pcm.size * 1000L / (2 * channels * sampleRate)
+        if (!done.await(ms + VOICE_SLACK_MS, java.util.concurrent.TimeUnit.MILLISECONDS)) {
+            // Capture stopped mid-turn; the rest of it is dropped rather than played late.
+            synchronized(voiceLock) { if (spokenDone === done) spoken = null }
+        }
+        return true
+    }
+
+    private fun mixVoice(pcm: ByteArray, size: Int): ByteArray = synchronized(voiceLock) {
+        val voice = spoken ?: return pcm
+        val out = pcm.copyOf(size)
+        var i = 0
+        while (i + 1 < size) {
+            val music = (out[i].toInt() and 0xFF) or (out[i + 1].toInt() shl 8)
+            val word = if (spokenAt + 1 < voice.size) (voice[spokenAt].toInt() and 0xFF) or (voice[spokenAt + 1].toInt() shl 8) else 0
+            val mixed = (music * DUCK_PERCENT / 100 + word).coerceIn(Short.MIN_VALUE.toInt(), Short.MAX_VALUE.toInt())
+            out[i] = mixed.toByte()
+            out[i + 1] = (mixed shr 8).toByte()
+            i += 2
+            spokenAt += 2
+        }
+        if (spokenAt >= voice.size) {
+            spoken = null
+            spokenDone?.countDown()
+            spokenDone = null
+        }
+        out
+    }
+
+    /** How loud the music stays under a spoken turn. */
+    private const val DUCK_PERCENT = 30
+    private const val VOICE_SLACK_MS = 2_000L
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/call/CarCalls.kt

@@ -23,19 +23,19 @@ data class Caller(val number: String, val name: String?) {
 sealed interface CallUiState {
     data object None : CallUiState
     data class Ringing(val caller: Caller, val canDecline: Boolean) : CallUiState
-    data class Active(val caller: Caller?) : CallUiState
+    /** [since] is the uptime the call went off-hook, for the timer. */
+    data class Active(val caller: Caller?, val since: Long) : CallUiState
 }
 
 /**
- * Tracks the phone's call state for the car screen, and answers or declines through the two
+ * Tracks the phone's call state for the car screen, and answers or declines through the
  * doors a sideloaded app can use: [android.telecom.TelecomManager.acceptRingingCall] to answer,
- * and [GearslipCallScreening]'s response to decline one that is still ringing.
+ * [GearslipCallScreening]'s response to decline one that is still ringing, and
+ * [android.telecom.TelecomManager.endCall] to hang up, which needs only ANSWER_PHONE_CALLS for an
+ * ordinary carrier call. Mute is the phone's microphone mute, put back when the call ends.
  *
- * Ending a call already answered needs MODIFY_PHONE_STATE, a privileged permission Gearslip
- * cannot hold, so a call taken here is finished the way it would be without Gearslip at all -
- * from the phone itself, a paired headset, or the car's own Bluetooth if it has any. Call audio
- * stays on the phone's normal voice path too; nothing here sends it over the USB link, which
- * only ever carries media playback.
+ * Call audio stays on the phone's normal voice path; nothing here sends it over the USB link,
+ * which only ever carries media playback.
  */
 object CarCalls {
 
@@ -47,9 +47,14 @@ object CarCalls {
     private var pendingRespond: ((allow: Boolean) -> Unit)? = null
     private var ringingCaller: Caller? = null
 
+    private val _muted = MutableStateFlow(false)
+    val muted: StateFlow<Boolean> = _muted.asStateFlow()
+    private var audio: android.media.AudioManager? = null
+
     fun start(context: Context) {
         if (watcher != null) return
         if (context.checkSelfPermission(Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) return
+        audio = context.getSystemService(android.media.AudioManager::class.java)
         val manager = context.getSystemService(TelephonyManager::class.java) ?: return
         val callback = object : TelephonyCallback(), TelephonyCallback.CallStateListener {
             override fun onCallStateChanged(state: Int) = onPhoneState(state)
@@ -66,6 +71,7 @@ object CarCalls {
         watcher = null
         pendingRespond = null
         ringingCaller = null
+        unmute()
         _state.value = CallUiState.None
     }
 
@@ -74,11 +80,15 @@ object CarCalls {
             TelephonyManager.CALL_STATE_IDLE -> {
                 pendingRespond = null
                 ringingCaller = null
+                // A mute left on would silence the microphone for everything after the call.
+                unmute()
                 _state.value = CallUiState.None
             }
             TelephonyManager.CALL_STATE_OFFHOOK -> {
                 pendingRespond = null
-                _state.value = CallUiState.Active(ringingCaller)
+                if (_state.value !is CallUiState.Active) {
+                    _state.value = CallUiState.Active(ringingCaller, android.os.SystemClock.uptimeMillis())
+                }
             }
             TelephonyManager.CALL_STATE_RINGING -> {
                 // The number itself only ever arrives through the screening service; if this
@@ -109,6 +119,39 @@ object CarCalls {
         runCatching { respond(false) }.onFailure { GearslipLog.w("calls: decline failed: ${it.message}") }
     }
 
+    /** A call Gearslip itself is placing, so the call pill can say who it's to. */
+    fun outgoingCall(context: Context, number: String) {
+        ringingCaller = Caller(number, lookUpName(context, number))
+    }
+
+    fun end(context: Context) {
+        if (context.checkSelfPermission(Manifest.permission.ANSWER_PHONE_CALLS) != PackageManager.PERMISSION_GRANTED) {
+            GearslipLog.w("calls: ending a call needs ANSWER_PHONE_CALLS, which was never granted")
+            return
+        }
+        val telecom = context.getSystemService(TelecomManager::class.java) ?: return
+        @Suppress("DEPRECATION")
+        runCatching { telecom.endCall() }
+            .onSuccess { if (!it) GearslipLog.w("calls: the phone wouldn't end the call") }
+            .onFailure { GearslipLog.w("calls: end failed: ${it.message}") }
+    }
+
+    fun toggleMute() {
+        val manager = audio ?: return
+        val want = !_muted.value
+        runCatching { manager.isMicrophoneMute = want }
+            .onFailure { GearslipLog.w("calls: mute failed: ${it.message}") }
+        // Read back rather than trusted: some phones let the call app overrule it.
+        _muted.value = manager.isMicrophoneMute
+        if (_muted.value != want) GearslipLog.w("calls: the phone didn't take the mute change")
+    }
+
+    private fun unmute() {
+        if (!_muted.value) return
+        runCatching { audio?.isMicrophoneMute = false }
+        _muted.value = false
+    }
+
     fun answer(context: Context) {
         if (context.checkSelfPermission(Manifest.permission.ANSWER_PHONE_CALLS) != PackageManager.PERMISSION_GRANTED) {
             GearslipLog.w("calls: answer needs ANSWER_PHONE_CALLS, which was never granted")

gearslip/src/main/java/app/seb3thehacker/gearslip/call/CarPhoneStatus.kt

@@ -0,0 +1,108 @@
+package app.seb3thehacker.gearslip.call
+
+import android.os.SystemClock
+import android.view.KeyEvent
+import app.seb3thehacker.gearslip.GearslipLog
+import app.seb3thehacker.gearslip.Protobuf
+import app.seb3thehacker.gearslip.Wire
+import app.seb3thehacker.gearslip.car.CarKeys
+
+/**
+ * Tells the car about calls, so its own screens show them: the instrument cluster, the steering
+ * wheel display, the car's phone page. Android Auto does the same over the car's
+ * PhoneStatusService (Service field 10):
+ *
+ *   -> PhoneStatusUpdate { repeated PhoneCall calls = 1 }
+ *        PhoneCall { state = 1 (1 in call, 4 incoming, 6 muted); duration_seconds = 2;
+ *                    number = 3; name = 4 }
+ *   <- PhoneStatusInput { input = 1 { action = 1 (7 call) }; caller = 2; name = 3 }
+ *
+ * Read once a second from [CarCalls]. An update goes when the call changes, and every second
+ * while one is going, so the car's timer counts along; no calls goes once, as an empty list.
+ * The car's own call button answers through [CarKeys], like the steering wheel's.
+ */
+class CarPhoneStatus(
+    val channelId: Int,
+    private val sendOnChannel: (messageId: Int, body: ByteArray) -> Unit,
+) {
+    @Volatile private var running = false
+    private var sent: String? = null
+
+    fun onMessage(messageId: Int, body: ByteArray) {
+        when (messageId) {
+            MSG_CHANNEL_OPEN_RESPONSE -> {
+                val status = Protobuf.readInt32Field(body, 1)
+                GearslipLog.i("phone status: <- ChannelOpenResponse: status=$status")
+                if (status == 0) start()
+            }
+            MSG_INPUT -> onInput(body)
+            else -> GearslipLog.i("phone status: <- unhandled message id=$messageId (${body.size} bytes)")
+        }
+    }
+
+    private fun start() {
+        if (running) return
+        running = true
+        Thread({
+            while (running) {
+                runCatching { tick() }.onFailure { GearslipLog.w("phone status: ${it.message}") }
+                Thread.sleep(TICK_MS)
+            }
+        }, "gearslip-phone-status").start()
+    }
+
+    fun stop() {
+        running = false
+    }
+
+    private fun tick() {
+        val call = when (val state = CarCalls.state.value) {
+            CallUiState.None -> null
+            is CallUiState.Ringing -> Call(STATE_INCOMING, 0, state.caller)
+            is CallUiState.Active -> Call(
+                if (CarCalls.muted.value) STATE_MUTED else STATE_IN_CALL,
+                ((SystemClock.uptimeMillis() - state.since) / 1000).coerceAtLeast(0),
+                state.caller,
+            )
+        }
+        // Only a call that's going changes from one second to the next.
+        val key = call?.let { "${it.state}|${it.caller?.number}|${it.caller?.name}|${if (it.state == STATE_INCOMING) 0 else it.seconds}" } ?: ""
+        if (key == sent) return
+        val changed = call?.state != lastState
+        sent = key
+        lastState = call?.state
+        val body = call?.let { Protobuf.bytesField(1, it.encode()) } ?: ByteArray(0)
+        sendOnChannel(MSG_STATUS, body)
+        if (changed) GearslipLog.i("phone status: -> ${call?.let { STATE_NAMES[it.state] } ?: "no calls"}")
+    }
+
+    private var lastState: Int? = null
+
+    private class Call(val state: Int, val seconds: Long, val caller: Caller?) {
+        fun encode(): ByteArray {
+            var body = Protobuf.varintField(1, state.toLong()) + Protobuf.varintField(2, seconds)
+            caller?.number?.takeIf { it.isNotBlank() }?.let { body += Protobuf.stringField(3, it) }
+            caller?.name?.takeIf { it.isNotBlank() }?.let { body += Protobuf.stringField(4, it) }
+            return body
+        }
+    }
+
+    /** The car's own phone buttons. Only "call" does anything: it answers, as the wheel's does. */
+    private fun onInput(body: ByteArray) {
+        val action = Wire.bytes(Wire.fields(body), 1)?.let { Wire.varint(Wire.fields(it), 1)?.toInt() }
+        GearslipLog.i("phone status: <- input action=${action ?: "?"}")
+        if (action == ACTION_CALL) CarKeys.onKey(KeyEvent.KEYCODE_CALL, down = true, longPress = false)
+    }
+
+    companion object {
+        private const val TICK_MS = 1_000L
+        private const val MSG_CHANNEL_OPEN_RESPONSE = 8
+        private const val MSG_STATUS = 32769 // 0x8001
+        private const val MSG_INPUT = 32770 // 0x8002
+        private const val STATE_IN_CALL = 1
+        private const val STATE_INCOMING = 4
+        private const val STATE_MUTED = 6
+        private const val ACTION_CALL = 7
+        private val STATE_NAMES = mapOf(STATE_IN_CALL to "in a call", STATE_INCOMING to "ringing", STATE_MUTED to "in a call, muted")
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/AllAppsScreen.kt

@@ -0,0 +1,65 @@
+package app.seb3thehacker.gearslip.car
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.lazy.grid.items
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.remember
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import app.seb3thehacker.gearslip.R
+import app.seb3thehacker.gearslip.mirror.PhoneApp
+import app.seb3thehacker.gearslip.mirror.PhoneApps
+import androidx.core.graphics.drawable.toBitmap
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+/**
+ * Launcher mode's app drawer: every app on the device, A to Z, each opened full screen. Gearslip
+ * comes first, for its own settings, which the car UI only partly covers.
+ */
+@Composable
+fun AllAppsScreen() {
+    val context = LocalContext.current
+    val apps by produceState(initialValue = PhoneApps.cached() ?: emptyList(), context) {
+        value = PhoneApps.cached() ?: withContext(Dispatchers.IO) { PhoneApps.installed(context).also { PhoneApps.warm(context) } }
+    }
+    val gearslip = remember(context) {
+        val label = context.packageManager.getApplicationLabel(context.applicationInfo).toString()
+        val icon = runCatching { context.packageManager.getApplicationIcon(context.packageName).toBitmap(ICON_PX, ICON_PX).asImageBitmap() }
+        PhoneApp(context.packageName, label, icon.getOrNull())
+    }
+
+    Column(Modifier.fillMaxSize().padding(start = 20.dp, end = 20.dp, top = 12.dp)) {
+        ScreenHeader(stringResource(R.string.app_all_apps))
+        Spacer(Modifier.height(12.dp))
+        LazyVerticalGrid(
+            columns = GridCells.Adaptive(minSize = 108.dp),
+            modifier = Modifier.fillMaxSize(),
+            contentPadding = PaddingValues(bottom = 16.dp),
+            horizontalArrangement = Arrangement.spacedBy(12.dp),
+            verticalArrangement = Arrangement.spacedBy(12.dp),
+        ) {
+            item {
+                PhoneAppTile(gearslip) { LauncherMode.launch(context, context.packageName) }
+            }
+            items(apps.sortedBy { it.label.lowercase() }) { app ->
+                PhoneAppTile(app) { LauncherMode.launch(context, app.packageName) }
+            }
+        }
+    }
+}
+
+private const val ICON_PX = 128

gearslip/src/main/java/app/seb3thehacker/gearslip/car/AssistantCommands.kt

@@ -61,7 +61,7 @@ object AssistantCommands {
 
     private suspend fun allEntries(context: Context): List<Entry> {
         val vehicleData = CarSettings.experimentalFeaturesEnabled.value && CarSettings.carSensorsEnabled.value
-        val builtIn = BuiltInApps.entries.filter { it.builtIn !== BuiltInApps.VehicleData || vehicleData }
+        val builtIn = BuiltInApps.entries(LauncherMode.active.value, LauncherMode.canCall(context)).filter { it.builtIn !== BuiltInApps.VehicleData || vehicleData }
         return builtIn + (LauncherCache.entries ?: withContext(Dispatchers.IO) { LauncherCache.load(context) })
     }
 
@@ -95,7 +95,12 @@ object AssistantCommands {
         heard: String,
     ): String? {
         // "use Organic Maps to get to X", "open OsmAnd and navigate to X": the app comes first.
-        var text = heard
+        // "take me home", "go home": no "to", so no trigger would catch them.
+        var text = if (Regex("^(?:(?:take|bring|get|drive) me|go|drive|head|get|directions|go back|head back) home$").matches(heard)) {
+            "navigate to home"
+        } else {
+            heard
+        }
         var leadingApp: String? = null
         Regex("^(?:use|using|with|open|in|on) (.+?) (?:to |and )(.+)$").find(text)?.let { m ->
             if (after(m.groupValues[2], NAVIGATE_TRIGGERS) != null) {
@@ -135,6 +140,20 @@ object AssistantCommands {
         val (place, nearby) = plainPlace(destination)
         destination = place
         if (destination.isBlank()) return "Where to?"
+        // "home", "work", or a name from Saved places: its address is the search.
+        var spoken: String? = null
+        SavedPlaces.match(context, destination)?.let { (slot, saved) ->
+            val name = when (slot) {
+                SavedPlaces.HOME -> "home"
+                SavedPlaces.WORK -> "work"
+                else -> saved.label
+            }
+            if (saved.address.isBlank()) {
+                return "You haven't saved a $name address yet. Add it under Saved places in Gearslip's settings on your phone."
+            }
+            destination = saved.address
+            spoken = if (slot == SavedPlaces.HOME) "home" else "to $name"
+        }
 
         val chosen = chosenApp ?: when {
             navApps.size == 1 -> navApps.first()
@@ -144,6 +163,7 @@ object AssistantCommands {
 
         CarServices.connectNav(template, frame, destination)
         navigator.home()
+        spoken?.let { return "Navigating $it with ${chosen.label}." }
         return if (nearby) "Finding the nearest $destination with ${chosen.label}." else "Navigating to $destination with ${chosen.label}."
     }
 

gearslip/src/main/java/app/seb3thehacker/gearslip/car/BluetoothAudioCheck.kt

@@ -98,7 +98,7 @@ object BluetoothAudioCheck {
         if (!armed) return
         val context = appContext ?: return
         if (CarSettings.pipeAudio.value) {
-            set(false, "USB audio is on")
+            set(false, "audio goes through Gearslip")
             return
         }
         if (!CarSettings.bluetoothWarning.value) {

gearslip/src/main/java/app/seb3thehacker/gearslip/car/BluetoothPairOverlay.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
@@ -45,32 +47,28 @@ internal fun BluetoothPairOverlay() {
             val locationOff by LocationCheck.off.collectAsState()
             val locationDismissed by LocationCheck.carDismissed.collectAsState()
             if (missing && bluetoothAudio && warn && !dismissed) PairCard(
-                title = "Bluetooth isn't connected",
-                body = "Music plays over Bluetooth, but your phone isn't connected to the car. " +
-                    "Connect it from the car's Bluetooth menu or your phone's.",
-                secondary = "Don't show again" to BluetoothAudioCheck::neverAgain,
-                primary = "OK" to BluetoothAudioCheck::dismissOnCar,
+                title = stringResource(R.string.home_bt_title),
+                body = stringResource(R.string.overlay_bt_body),
+                secondary = stringResource(R.string.overlay_dont_show) to BluetoothAudioCheck::neverAgain,
+                primary = stringResource(R.string.overlay_ok) to BluetoothAudioCheck::dismissOnCar,
             ) else if (locationOff && !locationDismissed) PairCard(
-                title = "Location is off",
-                body = "Map apps can't show where you are or give directions. Turn on location " +
-                    "in your phone's quick settings when you're parked.",
-                secondary = "Don't show again" to LocationCheck::neverAgain,
-                primary = "OK" to LocationCheck::dismissOnCar,
+                title = stringResource(R.string.overlay_location_off),
+                body = stringResource(R.string.overlay_location_body),
+                secondary = stringResource(R.string.overlay_dont_show) to LocationCheck::neverAgain,
+                primary = stringResource(R.string.overlay_ok) to LocationCheck::dismissOnCar,
             )
         }
         CarBluetooth.Prompt.ASK -> PairCard(
-            title = "Pair with this car?",
-            body = (if (bluetoothAudio) "Calls and music play" else "Calls play") +
-                " through the car's speakers once your phone and the car are paired. Your phone " +
-                "then asks you to confirm a code.",
-            secondary = "Not now" to CarBluetooth::notNow,
-            primary = "Pair" to CarBluetooth::pair,
+            title = stringResource(R.string.overlay_pair_title),
+            body = stringResource(if (bluetoothAudio) R.string.overlay_pair_body_music else R.string.overlay_pair_body),
+            secondary = stringResource(R.string.worked_not_now) to CarBluetooth::notNow,
+            primary = stringResource(R.string.overlay_pair) to CarBluetooth::pair,
         )
         CarBluetooth.Prompt.PAIRING -> PairCard(
-            title = "Confirm on your phone",
-            body = "Check the code on your phone and tap Pair. The car may ask too.",
+            title = stringResource(R.string.overlay_confirm_title),
+            body = stringResource(R.string.overlay_confirm_body),
             secondary = null,
-            primary = "Hide" to CarBluetooth::hide,
+            primary = stringResource(R.string.carset_hide) to CarBluetooth::hide,
         )
     }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CallOverlay.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import androidx.compose.foundation.shape.CircleShape
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
@@ -33,21 +35,17 @@ import app.seb3thehacker.gearslip.call.CallUiState
 import app.seb3thehacker.gearslip.call.CarCalls
 
 /**
- * Sits above whatever the car is showing while a call is ringing or under way. Ringing takes the
- * whole screen, because nothing else matters more right now; an active call is a thin band along
- * the top, since from here the driver can only see who it is, not end it - see [CarCalls].
+ * Takes the whole car screen while a call is ringing, because nothing else matters more right
+ * now. A call under way moves into the nav bar instead (see NavCallPill), so it covers nothing.
  */
 @Composable
-fun CallOverlay(modifier: Modifier = Modifier) {
+fun CallOverlay() {
     val state by CarCalls.state.collectAsState()
     val context = LocalContext.current.applicationContext
 
     when (val s = state) {
-        // Covers the box regardless of where the caller aligned it, so the alignment below is
-        // only ever felt by the active-call banner, which is the one that isn't full-screen.
         is CallUiState.Ringing -> IncomingCall(s, onAnswer = { CarCalls.answer(context) }, onDecline = CarCalls::decline)
-        is CallUiState.Active -> ActiveCallBanner(s, modifier)
-        CallUiState.None -> {}
+        else -> {}
     }
 }
 
@@ -67,7 +65,7 @@ private fun IncomingCall(s: CallUiState.Ringing, onAnswer: () -> Unit, onDecline
             )
             Spacer(Modifier.height(16.dp))
             Text(
-                "Incoming call",
+                stringResource(R.string.call_incoming),
                 style = MaterialTheme.typography.titleMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
@@ -80,13 +78,13 @@ private fun IncomingCall(s: CallUiState.Ringing, onAnswer: () -> Unit, onDecline
             )
             Spacer(Modifier.height(56.dp))
             Row(horizontalArrangement = Arrangement.spacedBy(48.dp)) {
-                CallButton(Icons.Filled.Close, "Decline", MaterialTheme.colorScheme.error, enabled = s.canDecline, onClick = onDecline)
-                CallButton(Icons.Filled.Call, "Answer", MaterialTheme.colorScheme.primary, enabled = true, onClick = onAnswer)
+                CallButton(Icons.Filled.Close, stringResource(R.string.call_decline), MaterialTheme.colorScheme.error, enabled = s.canDecline, onClick = onDecline)
+                CallButton(Icons.Filled.Call, stringResource(R.string.call_answer), MaterialTheme.colorScheme.primary, enabled = true, onClick = onAnswer)
             }
             if (!s.canDecline) {
                 Spacer(Modifier.height(20.dp))
                 Text(
-                    "Already ringing out loud - answer here, or let it ring.",
+                    stringResource(R.string.call_ringing),
                     style = MaterialTheme.typography.bodySmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
@@ -110,25 +108,3 @@ private fun CallButton(icon: ImageVector, label: String, color: Color, enabled:
         Text(label, style = MaterialTheme.typography.labelLarge)
     }
 }
-
-@Composable
-private fun ActiveCallBanner(s: CallUiState.Active, modifier: Modifier = Modifier) {
-    Surface(
-        color = MaterialTheme.colorScheme.primaryContainer,
-        contentColor = MaterialTheme.colorScheme.onPrimaryContainer,
-        modifier = modifier.fillMaxWidth(),
-    ) {
-        Row(
-            Modifier.padding(horizontal = 20.dp, vertical = 10.dp),
-            horizontalArrangement = Arrangement.Center,
-        ) {
-            Icon(Icons.Filled.Call, contentDescription = null, modifier = Modifier.size(20.dp))
-            Spacer(Modifier.height(0.dp))
-            Text(
-                "  On a call" + (s.caller?.let { " with ${it.label}" } ?: ""),
-                style = MaterialTheme.typography.labelLarge,
-                fontWeight = FontWeight.SemiBold,
-            )
-        }
-    }
-}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarAlerts.kt

@@ -0,0 +1,203 @@
+package app.seb3thehacker.gearslip.car
+
+import androidx.annotation.MainThread
+import androidx.car.app.model.Action
+import androidx.car.app.model.Alert
+import androidx.car.app.model.AlertCallback
+import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.core.LinearEasing
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.LiveRegionMode
+import androidx.compose.ui.semantics.liveRegion
+import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import app.seb3thehacker.gearslip.GearslipLog
+import app.seb3thehacker.gearslip.R
+import app.seb3thehacker.gearslip.car.theme.GsColors
+import app.seb3thehacker.gearslip.car.theme.GsIconBox
+import app.seb3thehacker.gearslip.host.cancel
+import app.seb3thehacker.gearslip.host.click
+import app.seb3thehacker.gearslip.host.color
+import app.seb3thehacker.gearslip.host.dismissed
+import app.seb3thehacker.gearslip.host.text
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+/**
+ * The one alert on the car screen, from whichever hosted app sent it: Waze asking whether a
+ * hazard is still there, say. As in Android Auto, a newer alert replaces the one showing, and it
+ * shows over any screen, since a question about the road matters while music is up too.
+ */
+@MainThread
+internal object CarAlerts {
+    class Shown(val owner: Any, val alert: Alert)
+
+    private val current = MutableStateFlow<Shown?>(null)
+    val shown: StateFlow<Shown?> = current.asStateFlow()
+
+    fun show(owner: Any, alert: Alert) {
+        val old = current.value
+        current.value = Shown(owner, alert)
+        GearslipLog.i("host: alert ${alert.id} \"${alert.title.text()}\" with ${alert.actions.size} buttons")
+        if (old != null && !(old.owner === owner && old.alert.id == alert.id)) old.alert.callbackDelegate.dismissed()
+    }
+
+    /** The app took its alert down; a no-op unless that alert is the one showing. */
+    fun dismiss(owner: Any, id: Int) {
+        val shown = current.value ?: return
+        if (shown.owner !== owner || shown.alert.id != id) return
+        current.value = null
+        shown.alert.callbackDelegate.dismissed()
+    }
+
+    /** The driver tapped one of its buttons: the app gets the tap, and the alert goes. */
+    fun tapped(shown: Shown, action: Action) {
+        action.onClickDelegate.click("alert button")
+        if (current.value !== shown) return
+        current.value = null
+        shown.alert.callbackDelegate.dismissed()
+    }
+
+    fun cancelled(shown: Shown, reason: Int) {
+        if (current.value !== shown) return
+        current.value = null
+        shown.alert.callbackDelegate.cancel(reason)
+    }
+
+    /** The app disconnected: its alert goes with it, and there is no one left to tell. */
+    fun clear(owner: Any) {
+        if (current.value?.owner === owner) current.value = null
+    }
+}
+
+@Composable
+internal fun CarAlertOverlay(modifier: Modifier = Modifier) {
+    val current by CarAlerts.shown.collectAsState()
+    val shown = current ?: return
+    val alert = shown.alert
+    val timed = alert.durationMillis in 1 until Alert.DURATION_SHOW_INDEFINITELY
+    // What's left of the alert's time, drawn as the bar along its foot.
+    val left = remember(shown) { Animatable(1f) }
+    LaunchedEffect(shown) {
+        if (!timed) return@LaunchedEffect
+        left.animateTo(0f, tween(alert.durationMillis.coerceAtMost(Int.MAX_VALUE.toLong()).toInt(), easing = LinearEasing))
+        CarAlerts.cancelled(shown, AlertCallback.REASON_TIMEOUT)
+    }
+    val scheme = MaterialTheme.colorScheme
+    val dark = scheme.surface.luminanceIsDark()
+    Surface(
+        modifier
+            .padding(horizontal = 24.dp, vertical = 16.dp)
+            .widthIn(max = 640.dp)
+            .fillMaxWidth()
+            .semantics { liveRegion = LiveRegionMode.Polite },
+        shape = RoundedCornerShape(24.dp),
+        color = scheme.surfaceContainerHigh,
+        shadowElevation = 8.dp,
+    ) {
+        Column {
+            Row(Modifier.padding(start = 20.dp, end = 12.dp, top = 16.dp), verticalAlignment = Alignment.CenterVertically) {
+                if (alert.icon != null) {
+                    CarGlyph(alert.icon, Modifier.size(40.dp))
+                    Spacer(Modifier.width(16.dp))
+                }
+                Column(Modifier.weight(1f)) {
+                    Text(
+                        alert.title.text(),
+                        style = MaterialTheme.typography.titleLarge,
+                        fontWeight = FontWeight.Bold,
+                        maxLines = 2,
+                        overflow = TextOverflow.Ellipsis,
+                    )
+                    alert.subtitle?.text()?.takeIf { it.isNotEmpty() }?.let {
+                        Text(
+                            it,
+                            style = MaterialTheme.typography.titleMedium,
+                            color = scheme.onSurfaceVariant,
+                            maxLines = 2,
+                            overflow = TextOverflow.Ellipsis,
+                        )
+                    }
+                }
+                // With no timer and no buttons, nothing else would ever take it away.
+                if (!timed || alert.actions.isEmpty()) {
+                    GsIconBox(
+                        onClick = { CarAlerts.cancelled(shown, AlertCallback.REASON_USER_ACTION) },
+                        modifier = Modifier.size(56.dp),
+                        colors = GsColors(Color.Transparent, scheme.onSurface),
+                        shape = CircleShape,
+                    ) {
+                        Icon(Icons.Filled.Close, contentDescription = stringResource(R.string.close))
+                    }
+                }
+            }
+            if (alert.actions.isNotEmpty()) {
+                Row(
+                    Modifier.fillMaxWidth().padding(horizontal = 20.dp, vertical = 16.dp),
+                    horizontalArrangement = Arrangement.spacedBy(12.dp),
+                ) {
+                    alert.actions.take(2).forEach { action ->
+                        val custom = action.backgroundColor?.type?.let { it != androidx.car.app.model.CarColor.TYPE_DEFAULT } == true
+                        GsIconBox(
+                            onClick = { CarAlerts.tapped(shown, action) },
+                            modifier = Modifier.weight(1f).height(64.dp),
+                            colors = GsColors(
+                                action.backgroundColor.color(dark, scheme.surfaceContainerHighest),
+                                if (custom) Color.White else scheme.onSurface,
+                            ),
+                            enabled = action.isEnabled,
+                        ) {
+                            Row(verticalAlignment = Alignment.CenterVertically) {
+                                if (action.icon != null) {
+                                    CarGlyph(action.icon, Modifier.size(28.dp))
+                                    Spacer(Modifier.width(8.dp))
+                                }
+                                Text(action.title.text(), style = MaterialTheme.typography.titleMedium, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                            }
+                        }
+                    }
+                }
+            } else {
+                Spacer(Modifier.height(16.dp))
+            }
+            if (timed) {
+                Box(Modifier.fillMaxWidth().height(4.dp).background(scheme.surfaceContainerHighest)) {
+                    Box(Modifier.fillMaxWidth(left.value).height(4.dp).clip(RoundedCornerShape(2.dp)).background(scheme.primary))
+                }
+            }
+        }
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarAppStage.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import android.view.SurfaceHolder
 import android.view.SurfaceView
@@ -11,11 +13,14 @@ import androidx.compose.ui.input.pointer.PointerEventPass
 import androidx.compose.ui.input.pointer.util.VelocityTracker
 import kotlin.math.hypot
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.height
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
@@ -34,8 +39,11 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.layout.boundsInWindow
+import androidx.compose.ui.layout.onGloballyPositioned
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
+import androidx.compose.material.icons.filled.Close
 import androidx.compose.ui.viewinterop.AndroidView
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.host.CarAppConnection
@@ -59,13 +67,40 @@ fun CarAppStage(
 ) {
     val template by connection.template.collectAsStateWithLifecycle()
 
+    val cover = remember { ChromeCover() }
+    val navBar = LocalNavBarInset.current
+
     Box(Modifier.fillMaxSize()) {
         // The app's own drawing goes underneath; everything else is the host's rendering of
         // the template it described, laid over the top.
-        if (status.surfaceRequested) {
-            AppSurface(connection, frame, template, Modifier.fillMaxSize())
+        androidx.compose.runtime.CompositionLocalProvider(LocalChromeCover provides cover, LocalCarAppConnection provides connection) {
+            if (status.surfaceRequested) {
+                AppSurface(connection, frame, template, Modifier.fillMaxSize())
+            }
+            // The docked player floats over one side of the map: the chrome keeps clear of it,
+            // and the app hears that side is covered, so its map centres in the rest.
+            val panel = LocalSidePanelInset.current
+            val panelAtStart = LocalCardsAtEnd.current
+            TemplateChrome(
+                template,
+                Modifier.fillMaxSize().padding(
+                    top = if (embedded) 0.dp else CHROME_BAR,
+                    bottom = navBar,
+                    start = if (panelAtStart) panel else 0.dp,
+                    end = if (panelAtStart) 0.dp else panel,
+                ),
+            )
+            if (panel > 0.dp) {
+                Box(
+                    Modifier
+                        .align(if (panelAtStart) Alignment.CenterStart else Alignment.CenterEnd)
+                        .fillMaxHeight()
+                        .width(panel)
+                        .covers("side-panel", if (panelAtStart) CoverEdge.START else CoverEdge.END),
+                )
+            }
+            BottomCover(navBar, Modifier.align(Alignment.BottomCenter))
         }
-        TemplateChrome(template, Modifier.fillMaxSize().padding(top = if (embedded) 0.dp else CHROME_BAR))
         if (!embedded) ChromeBar(status, onDisconnect, Modifier.align(Alignment.TopCenter))
     }
 }
@@ -84,14 +119,29 @@ private fun AppSurface(
     modifier: Modifier = Modifier,
 ) {
     var size by remember { mutableStateOf(0 to 0) }
+    var bounds by remember { mutableStateOf<androidx.compose.ui.geometry.Rect?>(null) }
+    val cover = LocalChromeCover.current
 
-    // The app lays its map out around whatever the host covers, so a template change moves the
-    // visible area even though the surface itself hasn't changed.
-    LaunchedEffect(template, size) {
-        val (width, height) = size
+    // The app lays its map out around whatever the host covers, so a template change or a card
+    // changing size moves the visible area even though the surface itself hasn't changed.
+    val (width, height) = size
+    val measured = bounds?.takeIf { width > 0 && height > 0 }?.let { cover?.visibleWithin(it, width, height) }
+    // The card column moves the map's centre but isn't taken out of the stable area: apps size
+    // their own overlays from it, and Vela's speedometer shrank to fit the strip right of the cards.
+    val cardsAtEnd = LocalCardsAtEnd.current
+    val cardEdge = cardEdge
+    val measuredStable = bounds?.takeIf { width > 0 && height > 0 }?.let { cover?.visibleWithin(it, width, height, skip = cardEdge) }
+    LaunchedEffect(template, size, measured, measuredStable, cardsAtEnd) {
         if (width > 0 && height > 0) {
-            val visible = visibleAreaFor(template, width, height)
-            connection.reportAreas(visible = visible, stable = visible)
+            val visible = visibleAreaFor(template, width, height, measured, cardsAtEnd)
+            // Waze seems to centre its car in the stable area rather than the visible one, so it
+            // gets the cards taken out of that too. Test: see whether its car moves out from under them.
+            val stable = if (!isContentTemplate(template) && connection.appPackage != "com.waze") {
+                visibleAreaFor(template, width, height, measuredStable, cardsAtEnd)
+            } else {
+                visible
+            }
+            connection.reportAreas(visible = visible, stable = stable)
         }
     }
 
@@ -101,7 +151,9 @@ private fun AppSurface(
     // new one on it before releasing the old: the old display's disconnect then takes the new one's
     // connection with it and the map freezes for good. The nav bar hiding for the search keyboard
     // and the lyrics pane opening both resize this area.
-    androidx.compose.foundation.layout.BoxWithConstraints(modifier) {
+    androidx.compose.foundation.layout.BoxWithConstraints(
+        modifier.onGloballyPositioned { bounds = it.boundsInWindow() },
+    ) {
         val epoch by connection.surfaceEpoch.collectAsState()
         androidx.compose.runtime.key(constraints.maxWidth, constraints.maxHeight, epoch) {
             SurfaceHost(connection, frame, onSize = { size = it }, Modifier.fillMaxSize())
@@ -189,28 +241,31 @@ private fun ChromeBar(
     onDisconnect: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
+    // The app's name and a way out, nothing else: which template is showing, or whether the
+    // app has drawn yet, is for the log, not the driver.
     Surface(
-        color = Color.Black.copy(alpha = 0.55f),
-        contentColor = Color.White,
-        modifier = modifier.fillMaxWidth(),
+        color = MaterialTheme.colorScheme.surfaceContainer,
+        contentColor = MaterialTheme.colorScheme.onSurface,
+        modifier = modifier.fillMaxWidth().height(CHROME_BAR),
     ) {
         Row(
-            Modifier.padding(horizontal = 16.dp, vertical = 6.dp),
+            Modifier.padding(horizontal = 16.dp),
             verticalAlignment = Alignment.CenterVertically,
         ) {
-            Column(Modifier.weight(1f)) {
-                Text(
-                    status.app ?: "Car app",
-                    style = MaterialTheme.typography.titleSmall,
-                    fontWeight = FontWeight.SemiBold,
-                )
-                val detail = buildList {
-                    status.template?.let { add(it) }
-                    add(if (status.surfaceAttached) "drawing" else "waiting for the app")
-                }.joinToString(" - ")
-                Text(detail, style = MaterialTheme.typography.bodySmall)
-            }
-            GsButton(onClick = onDisconnect, tone = GsTone.Tonal) { Text("Stop") }
+            Text(
+                status.app ?: stringResource(R.string.stage_car_app),
+                style = MaterialTheme.typography.titleSmall,
+                fontWeight = FontWeight.SemiBold,
+                modifier = Modifier.weight(1f),
+            )
+            GsIconButton(
+                androidx.compose.material.icons.Icons.Filled.Close,
+                status.app?.let { stringResource(R.string.stage_close, it) } ?: stringResource(R.string.stage_close_app),
+                onDisconnect,
+                size = 36.dp,
+                iconSize = 20.dp,
+                shape = androidx.compose.foundation.shape.CircleShape,
+            )
         }
     }
 }
@@ -220,3 +275,6 @@ private val CHROME_BAR = 44.dp
 
 /** Slower than this when the finger lifts and it was a drag that stopped, not a fling. */
 private const val FLING_MIN_PX_S = 400f
+
+/** The app connection a template on screen belongs to: the map app's, or the one opened from the launcher. */
+internal val LocalCarAppConnection = androidx.compose.runtime.staticCompositionLocalOf { CarServices.nav }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarApps.kt

@@ -1,6 +1,9 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.annotation.StringRes
+import app.seb3thehacker.gearslip.R
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.List
 import androidx.compose.material.icons.filled.Call
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material.icons.filled.Share
@@ -13,7 +16,9 @@ import app.seb3thehacker.gearslip.ProjectedContent
 /** One tile in the launcher and the screen it opens. */
 class CarApp(
     val id: String,
+    /** English, for matching what a driver says; [labelRes] is what the screen shows. */
     val label: String,
+    @param:StringRes val labelRes: Int,
     val icon: ImageVector,
     val content: @Composable () -> Unit,
 )
@@ -22,19 +27,28 @@ class CarApp(
 object CarApps {
 
     val all: List<CarApp> = listOf(
-        CarApp("web", "Browser", Icons.Filled.Search) {
+        CarApp("web", "Browser", R.string.app_browser, Icons.Filled.Search) {
             WebApp(content = ProjectedContent.resolve(LocalContext.current))
         },
-        CarApp("phone", "Screen sharing", Icons.Filled.Share) {
+        CarApp("phone", "Screen sharing", R.string.app_screen_sharing, Icons.Filled.Share) {
             PhoneAppsScreen()
         },
-        CarApp("dialer", "Phone", Icons.Filled.Call) {
+        CarApp("dialer", "Phone", R.string.carset_phone, Icons.Filled.Call) {
             PhoneDialerScreen()
         },
-        CarApp("settings", "Settings", Icons.Filled.Settings) {
+        CarApp("settings", "Settings", R.string.settings_title, Icons.Filled.Settings) {
             CarSettingsScreen()
         },
+        CarApp("allapps", "All apps", R.string.app_all_apps, Icons.Filled.List) {
+            AllAppsScreen()
+        },
     )
 
     fun find(id: String): CarApp? = all.firstOrNull { it.id == id }
+
+    /** The screens [BuiltInApps.entries] offers here, so a choice list never names a hidden one. */
+    fun shown(launcher: Boolean, canCall: Boolean): List<CarApp> {
+        val ids = BuiltInApps.entries(launcher, canCall).mapNotNull { (it.builtIn?.screen as? CarScreen.App)?.id }.toSet()
+        return all.filter { it.id in ids }
+    }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarBluetooth.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.annotation.StringRes
+import app.seb3thehacker.gearslip.R
 import android.Manifest
 import android.annotation.SuppressLint
 import android.bluetooth.BluetoothAdapter
@@ -38,6 +40,11 @@ import java.security.MessageDigest
  * phone's own Bluetooth address (apps get a placeholder), and confirming the pairing code without
  * asking. So a car may turn the request down, and the phone always shows its pairing dialog. The
  * channel stays closed unless the driver taps Pair: every new channel is a risk to cars that work.
+ *
+ * The one exception is a driver who typed the phone's real address into Settings. A VW MIB2 drops
+ * an already paired phone's Bluetooth when it connects over USB, because nothing tells it the two
+ * are the same phone (issue #28). With the address, Gearslip opens the channel on every connection
+ * and sends the same request, which is how Android Auto says so.
  */
 object CarBluetooth {
 
@@ -61,13 +68,15 @@ object CarBluetooth {
     @Volatile private var bondStarted = false
     /** From the Pair tap until it succeeds or fails, whether or not the card still shows. */
     @Volatile private var pairing = false
+    /** Already paired: the channel is open only to tell the car which phone this is. */
+    @Volatile private var announcing = false
     private var receiver: BroadcastReceiver? = null
 
     /** The car's Bluetooth address, when it named one in its service list. */
     val carAddress: String? get() = car?.service?.carAddress
 
     /** The car's Bluetooth channel once the driver has asked to pair, -1 otherwise. */
-    val channelId: Int get() = car?.takeIf { pairing }?.service?.serviceId ?: -1
+    val channelId: Int get() = car?.takeIf { pairing || announcing }?.service?.serviceId ?: -1
 
     fun init(context: Context) {
         appContext = context.applicationContext
@@ -81,9 +90,15 @@ object CarBluetooth {
     ) {
         car = Car(service, open, send)
         bondStarted = false
+        announcing = false
         log.i("the car offers Bluetooth pairing, methods=${service.pairingMethods}")
         val device = device() ?: return
         when {
+            device.bondState == BluetoothDevice.BOND_BONDED && typedAddress() != null -> {
+                log.i("already paired with this car - telling it which phone this is")
+                announcing = true
+                open()
+            }
             device.bondState == BluetoothDevice.BOND_BONDED -> log.i("already paired with this car")
             declined(service.carAddress) -> log.i("not paired, and the driver said not now for this car")
             else -> _prompt.value = Prompt.ASK
@@ -93,6 +108,7 @@ object CarBluetooth {
     fun onCarDisconnected() {
         car = null
         pairing = false
+        announcing = false
         main.post {
             stopWatching()
             _prompt.value = Prompt.NONE
@@ -111,7 +127,7 @@ object CarBluetooth {
         // If the car never answers on its channel, pair from the phone anyway.
         main.postDelayed({ startBond("the car didn't answer the pairing request") }, CAR_REPLY_WAIT_MS)
         main.postDelayed({
-            if (pairing) finish("Pairing didn't finish. Pair from the car's Bluetooth menu instead.")
+            if (pairing) finish(R.string.bt_pair_unfinished)
         }, GIVE_UP_MS)
     }
 
@@ -137,7 +153,8 @@ object CarBluetooth {
                 val status = Protobuf.readInt32Field(body, 1) ?: 0
                 log.i("<- ChannelOpenResponse: status=$status")
                 if (status != 0) {
-                    main.post { startBond("the car wouldn't open its Bluetooth channel") }
+                    if (announcing) log.i("the car wouldn't open its Bluetooth channel")
+                    else main.post { startBond("the car wouldn't open its Bluetooth channel") }
                     return
                 }
                 val method = c.service.pairingMethods.firstOrNull { it == METHOD_NUMERIC_COMPARISON }
@@ -151,6 +168,7 @@ object CarBluetooth {
             MSG_PAIRING_RESPONSE -> {
                 val fields = Wire.fields(body)
                 log.i("<- PairingResponse status=${Wire.varint(fields, 1)} already_paired=${Wire.varint(fields, 2) == 1L}")
+                if (!pairing) return
                 // Some cars start pairing themselves once they answer; give them a moment first.
                 main.postDelayed({ startBond("the car answered") }, CAR_BOND_WAIT_MS)
             }
@@ -168,7 +186,7 @@ object CarBluetooth {
         bondStarted = true
         val started = runCatching { device.createBond() }.getOrDefault(false)
         log.i("pairing from the phone ($why): ${if (started) "started" else "refused"}")
-        if (!started) finish("Pairing didn't start. Pair from the car's Bluetooth menu instead.")
+        if (!started) finish(R.string.bt_pair_not_started)
     }
 
     private fun watchBonding(device: BluetoothDevice) {
@@ -184,8 +202,8 @@ object CarBluetooth {
                 log.i("bond state $previous -> $state")
                 when {
                     state == BluetoothDevice.BOND_BONDING -> bondStarted = true
-                    state == BluetoothDevice.BOND_BONDED -> finish("Paired. Calls now play through the car.")
-                    previous == BluetoothDevice.BOND_BONDING -> finish("Pairing didn't finish. Pair from the car's Bluetooth menu instead.")
+                    state == BluetoothDevice.BOND_BONDED -> finish(R.string.bt_paired)
+                    previous == BluetoothDevice.BOND_BONDING -> finish(R.string.bt_pair_unfinished)
                 }
             }
         }
@@ -193,12 +211,12 @@ object CarBluetooth {
         receiver = r
     }
 
-    private fun finish(message: String) {
+    private fun finish(@StringRes message: Int) {
         pairing = false
         stopWatching()
         main.removeCallbacksAndMessages(null)
         _prompt.value = Prompt.NONE
-        CarToasts.show(this, message, CarToast.LENGTH_LONG)
+        CarToasts.show(this, appContext?.getString(message) ?: return, CarToast.LENGTH_LONG)
     }
 
     private fun stopWatching() {
@@ -227,12 +245,30 @@ object CarBluetooth {
         return adapter.getRemoteDevice(address)
     }
 
-    /** Apps get 02:00:00:00:00:00 here, not the real address. Sent anyway, as the field is required. */
+    /**
+     * Apps get 02:00:00:00:00:00 here, not the real address, so the one the driver typed in wins.
+     * Sent either way, as the field is required. Never logged: it identifies the phone.
+     */
     @SuppressLint("MissingPermission", "HardwareIds")
     private fun phoneAddress(): String =
-        runCatching { appContext?.getSystemService(BluetoothManager::class.java)?.adapter?.address }.getOrNull()
+        typedAddress()
+            ?: runCatching { appContext?.getSystemService(BluetoothManager::class.java)?.adapter?.address }.getOrNull()
             ?: "02:00:00:00:00:00"
 
+    private fun typedAddress(): String? = appContext?.let { typedAddress(it) }
+
+    /** The phone's own address as the driver typed it in Settings, or null. */
+    fun typedAddress(context: Context): String? =
+        AppSettings.getString(context, KEY_PHONE_ADDRESS, "").takeIf { BluetoothAdapter.checkBluetoothAddress(it) }
+
+    /** Saves [address] after tidying it up; false when it isn't one. Empty clears it. */
+    fun setTypedAddress(context: Context, address: String): Boolean {
+        val tidy = address.trim().uppercase().replace('-', ':')
+        if (tidy.isNotEmpty() && !BluetoothAdapter.checkBluetoothAddress(tidy)) return false
+        AppSettings.putString(context, KEY_PHONE_ADDRESS, tidy)
+        return true
+    }
+
     private fun declined(address: String): Boolean {
         val context = appContext ?: return false
         return hash(address) in AppSettings.getString(context, KEY_DECLINED, "").split(",")
@@ -244,6 +280,7 @@ object CarBluetooth {
             .take(8).joinToString("") { "%02x".format(it) }
 
     private const val KEY_DECLINED = "bluetooth_pair_declined"
+    private const val KEY_PHONE_ADDRESS = "phone_bluetooth_address"
     private const val CAR_REPLY_WAIT_MS = 5_000L
     private const val CAR_BOND_WAIT_MS = 3_000L
     private const val GIVE_UP_MS = 90_000L

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarDashboardScreen.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
@@ -60,7 +62,7 @@ fun CarDashboardScreen() {
             .padding(horizontal = 24.dp, vertical = 16.dp),
         verticalArrangement = Arrangement.spacedBy(24.dp),
     ) {
-        ScreenHeader("Today")
+        ScreenHeader(stringResource(R.string.dash_today))
         WeatherCard(context)
         AgendaCard(context)
         NotificationsSection()
@@ -84,9 +86,9 @@ private fun WeatherCard(context: Context) {
             horizontalArrangement = Arrangement.spacedBy(16.dp),
         ) {
             when (val s = state) {
-                WeatherState.Loading -> Text("Getting weather…", style = MaterialTheme.typography.bodyLarge)
+                WeatherState.Loading -> Text(stringResource(R.string.dash_getting_weather), style = MaterialTheme.typography.bodyLarge)
                 is WeatherState.Unavailable -> Text(
-                    s.reason, style = MaterialTheme.typography.bodyLarge,
+                    stringResource(s.reason), style = MaterialTheme.typography.bodyLarge,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
                 is WeatherState.Ready -> {
@@ -94,7 +96,7 @@ private fun WeatherCard(context: Context) {
                     WeatherIcon(w.code, w.isDay, size = 44.dp)
                     Column {
                         Text(
-                            "${w.temp}${w.tempUnit}  ·  ${Weather.describe(w.code)}",
+                            "${w.temp}${w.tempUnit}  ·  ${Weather.condition(w.code)}",
                             style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.SemiBold,
                         )
                         Text(w.place, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
@@ -112,12 +114,12 @@ private fun AgendaCard(context: Context) {
     }
 
     Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
-        Text("Coming up", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+        Text(stringResource(R.string.dash_coming_up), style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
         val list = events
         when {
-            list == null -> Text("Loading calendar…", style = MaterialTheme.typography.bodyMedium)
+            list == null -> Text(stringResource(R.string.dash_loading_calendar), style = MaterialTheme.typography.bodyMedium)
             list.isEmpty() -> Text(
-                "Nothing in the next week.",
+                stringResource(R.string.dash_nothing_week),
                 style = MaterialTheme.typography.bodyMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
@@ -135,7 +137,7 @@ private fun EventRow(event: AgendaEvent) {
             verticalAlignment = Alignment.CenterVertically,
         ) {
             Text(
-                eventWhen(event),
+                eventWhen(event, stringResource(R.string.dash_all_day)),
                 style = MaterialTheme.typography.bodyLarge,
                 fontWeight = FontWeight.SemiBold,
             )
@@ -149,14 +151,14 @@ private fun EventRow(event: AgendaEvent) {
     }
 }
 
-/** "Today" events show just a time; later days get a weekday so a week's list stays readable. */
-private fun eventWhen(event: AgendaEvent): String {
+/** stringResource(R.string.dash_today) events show just a time; later days get a weekday so a week's list stays readable. */
+private fun eventWhen(event: AgendaEvent, allDay: String): String {
     val zone = if (event.allDay) TimeZone.getTimeZone("UTC") else TimeZone.getDefault()
     val start = Calendar.getInstance(zone).apply { timeInMillis = event.startMillis }
     val today = Calendar.getInstance()
     val sameDay = start.get(Calendar.YEAR) == today.get(Calendar.YEAR) &&
         start.get(Calendar.DAY_OF_YEAR) == today.get(Calendar.DAY_OF_YEAR)
-    val time = if (event.allDay) "All day" else DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(event.startMillis))
+    val time = if (event.allDay) allDay else DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(event.startMillis))
     if (sameDay || (event.allDay && start.before(today))) return time
     return SimpleDateFormat("EEE", Locale.getDefault()).apply { timeZone = zone }.format(Date(event.startMillis)) + " " + time
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarData.kt

@@ -0,0 +1,110 @@
+package app.seb3thehacker.gearslip.car
+
+import app.seb3thehacker.gearslip.Wire
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+/**
+ * The car's sensors, read into real values for the car apps that ask (a map's speed, an EV app's
+ * range). [CarSensors] keeps the raw readings for the Vehicle data screen; this keeps the few with
+ * a known meaning, decoded the way Android Auto's SensorBatch scales them:
+ *
+ *   gps_location = 1 { latitude_e7 = 2; longitude_e7 = 3; accuracy_e3 = 4; altitude_e2 = 5;
+ *                      speed_e3 = 6; bearing_e6 = 7 }
+ *   compass = 2 { bearing_e6 = 1 }      speed = 3 { speed_e3 = 1 }  (metres per second)
+ *   odometer = 5 { kms_e1 = 1 }         fuel = 6 { level = 1 (percent); range = 2 (km); low = 3 }
+ *
+ * Each value is null until the car first sends it, and the whole lot clears when it disconnects.
+ */
+object CarData {
+
+    class Location(
+        val latitude: Double,
+        val longitude: Double,
+        val accuracyMeters: Float?,
+        val altitudeMeters: Double?,
+        val speedMps: Float?,
+        val bearingDegrees: Float?,
+    )
+
+    data class Snapshot(
+        val speedMps: Float? = null,
+        val odometerKm: Float? = null,
+        val fuelPercent: Int? = null,
+        val rangeKm: Int? = null,
+        val fuelLow: Boolean? = null,
+        val compassDegrees: Float? = null,
+        val location: Location? = null,
+        /** When each kind last changed, by its SensorBatch field number. */
+        val updatedAt: Map<Int, Long> = emptyMap(),
+    )
+
+    /** What the car says it is, from its service discovery: model and year. It names no maker. */
+    class Model(val name: String, val year: Int?)
+
+    private val flow = MutableStateFlow(Snapshot())
+    val state: StateFlow<Snapshot> = flow
+
+    @Volatile var model: Model? = null
+        private set
+
+    fun onModel(name: String, year: String) {
+        model = name.takeIf { it.isNotBlank() }?.let { Model(it, year.toIntOrNull()?.takeIf { y -> y > 0 }) }
+    }
+
+    fun onEvent(body: ByteArray) {
+        val now = System.currentTimeMillis()
+        val batch = Wire.fields(body)
+        var s = flow.value
+        val touched = HashSet<Int>()
+        // Each kind may come several times in one batch: the last is the newest.
+        Wire.allBytes(batch, LOCATION).lastOrNull()?.let { bytes ->
+            val f = Wire.fields(bytes)
+            val lat = Wire.varint(f, 2)?.toInt()
+            val lon = Wire.varint(f, 3)?.toInt()
+            if (lat != null && lon != null) {
+                s = s.copy(
+                    location = Location(
+                        lat / 1e7, lon / 1e7,
+                        Wire.varint(f, 4)?.let { it / 1e3f },
+                        Wire.varint(f, 5)?.let { it.toInt() / 1e2 },
+                        Wire.varint(f, 6)?.let { it.toInt() / 1e3f },
+                        Wire.varint(f, 7)?.let { it.toInt() / 1e6f },
+                    ),
+                )
+                touched += LOCATION
+            }
+        }
+        Wire.allBytes(batch, COMPASS).lastOrNull()?.let { bytes ->
+            Wire.varint(Wire.fields(bytes), 1)?.let { s = s.copy(compassDegrees = it.toInt() / 1e6f); touched += COMPASS }
+        }
+        Wire.allBytes(batch, SPEED).lastOrNull()?.let { bytes ->
+            Wire.varint(Wire.fields(bytes), 1)?.let { s = s.copy(speedMps = it.toInt() / 1e3f); touched += SPEED }
+        }
+        Wire.allBytes(batch, ODOMETER).lastOrNull()?.let { bytes ->
+            Wire.varint(Wire.fields(bytes), 1)?.let { s = s.copy(odometerKm = it.toInt() / 10f); touched += ODOMETER }
+        }
+        Wire.allBytes(batch, FUEL).lastOrNull()?.let { bytes ->
+            val f = Wire.fields(bytes)
+            s = s.copy(
+                fuelPercent = Wire.varint(f, 1)?.toInt() ?: s.fuelPercent,
+                rangeKm = Wire.varint(f, 2)?.toInt() ?: s.rangeKm,
+                fuelLow = Wire.varint(f, 3)?.let { it != 0L } ?: s.fuelLow,
+            )
+            touched += FUEL
+        }
+        if (touched.isEmpty()) return
+        flow.value = s.copy(updatedAt = s.updatedAt + touched.associateWith { now })
+    }
+
+    fun clear() {
+        flow.value = Snapshot()
+        model = null
+    }
+
+    const val LOCATION = 1
+    const val COMPASS = 2
+    const val SPEED = 3
+    const val ODOMETER = 5
+    const val FUEL = 6
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarEnvironment.kt

@@ -37,6 +37,9 @@ object CarEnvironment {
     private val frameFlow = MutableStateFlow(Frame(800, 480, 160))
     val frame: StateFlow<Frame> = frameFlow
 
+    /** The density the car reported; [frame] carries the one the car UI and its apps draw at. */
+    private var carDensityDpi = 160
+
     val phoneDark: StateFlow<Boolean> = phoneDarkFlow
     val darkOutside: StateFlow<Boolean> = darkOutsideFlow
     val battery: StateFlow<Battery> = batteryFlow
@@ -64,7 +67,9 @@ object CarEnvironment {
     }
 
     @Volatile private var sensorNight: Boolean? = null
-    private var appContext: Context? = null
+    /** Set once the car UI starts; the cluster screen draws with it too. */
+    var appContext: Context? = null
+        private set
     private var running = false
 
     private val handler = Handler(Looper.getMainLooper())
@@ -93,8 +98,18 @@ object CarEnvironment {
     }
 
     fun setDisplay(width: Int, height: Int, densityDpi: Int) {
-        displayFlow.value = "${width}x$height @ ${densityDpi}dpi"
-        frameFlow.value = Frame(width, height, densityDpi)
+        carDensityDpi = densityDpi
+        val dpi = CarSettings.effectiveDensity(densityDpi)
+        displayFlow.value = "${width}x$height @ ${dpi}dpi"
+        frameFlow.value = Frame(width, height, dpi)
+    }
+
+    /**
+     * Takes up the density setting. It's read only as a session starts, so the display and the
+     * apps on it can't disagree mid-drive; a session with no car behind it, the preview, asks here.
+     */
+    fun applyDensity() {
+        frameFlow.value = frameFlow.value.copy(densityDpi = CarSettings.effectiveDensity(carDensityDpi))
     }
 
     fun start(context: Context) {

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarFullscreen.kt

@@ -0,0 +1,51 @@
+package app.seb3thehacker.gearslip.car
+
+import android.os.SystemClock
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+
+/**
+ * Full screen for the screen that asks for it (the browser, or a video in it): no header and no
+ * nav bar. A swipe in from the top or bottom edge brings the nav bar back for a few seconds,
+ * with a button to leave full screen; [revealed] says when.
+ */
+object CarFullscreen {
+
+    var active by mutableStateOf(false)
+        private set
+
+    var revealed by mutableStateOf(false)
+        private set
+
+    private var lastTouch = 0L
+
+    fun enter() {
+        active = true
+        revealed = false
+    }
+
+    fun exit() {
+        active = false
+        revealed = false
+    }
+
+    /** A swipe in from an edge: show the nav bar and the way out. */
+    fun reveal() {
+        if (!active) return
+        lastTouch = SystemClock.uptimeMillis()
+        revealed = true
+    }
+
+    /** Any touch keeps a revealed bar up, so it doesn't slide away under a finger reaching for it. */
+    fun touch() {
+        if (revealed) lastTouch = SystemClock.uptimeMillis()
+    }
+
+    /** Called on a timer; hides the bar again after [REVEAL_MS] without a touch. */
+    fun tick() {
+        if (revealed && SystemClock.uptimeMillis() - lastTouch >= REVEAL_MS) revealed = false
+    }
+
+    private const val REVEAL_MS = 4_000L
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarHomeScreen.kt

@@ -1,5 +1,6 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -12,6 +13,8 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import app.seb3thehacker.gearslip.car.theme.gsPanelShadow
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.PlayArrow
@@ -64,7 +67,9 @@ import app.seb3thehacker.gearslip.media.NowPlaying
 import kotlinx.coroutines.launch
 
 /**
- * The home screen: the map on the left, the docked player on the right when asked for.
+ * The home screen: the map, with the docked player floating over one side of it when asked for.
+ * With the player on the left, the map app's cards move to the map's far edge, so the player, the
+ * map and the cards each keep their own space.
  *
  * The map is whatever navigation app was used last, brought back on its own. The player sits in
  * the nav bar's pill until its dock button moves it here; the column closes itself back to a
@@ -93,27 +98,57 @@ fun CarHome() {
         if (onHome) seenHome[0] = true
     }
     val splitScreen = phase == CarMedia.Phase.READY && now.isActive && panel != SidePanel.NONE
+    val playerLeft by CarSettings.playerLeft.collectAsStateWithLifecycle()
+    // What the card showed last, so it still has something to show while it slides away.
+    val shown = remember { androidx.compose.runtime.mutableStateOf(SidePanel.CONTROLS) }
+    if (panel != SidePanel.NONE) shown.value = panel
 
-    // No outer padding on any side, split screen or not - only the gap between the two panes
-    // when the player is sharing the screen with the map.
-    Row(
-        Modifier.fillMaxSize(),
-        horizontalArrangement = Arrangement.spacedBy(8.dp),
-    ) {
-        Box(
-            Modifier
-                .weight(if (splitScreen) 2.1f else 1f)
-                .fillMaxHeight(),
+    // The map runs edge to edge underneath; the player floats over one side of it as a card, with
+    // a gap all round. The map's surface keeps its size when the card comes and goes, so the app
+    // only re-centres its map instead of drawing onto a new surface.
+    BoxWithConstraints(Modifier.fillMaxSize()) {
+        val column = (maxWidth / PLAYER_SHARE).coerceIn(PLAYER_MIN_WIDTH, PLAYER_MAX_WIDTH)
+        androidx.compose.runtime.CompositionLocalProvider(
+            LocalCardsAtEnd provides (splitScreen && playerLeft),
+            LocalSidePanelInset provides if (splitScreen) column else 0.dp,
         ) {
             MapPane(navStatus, frame)
         }
-        if (splitScreen) {
-            val side = Modifier.weight(1f).fillMaxHeight()
-            if (panel == SidePanel.LYRICS) SideLyrics(now, side) else DockedPlayer(now, side)
+        androidx.compose.animation.AnimatedVisibility(
+            splitScreen,
+            Modifier.align(if (playerLeft) Alignment.CenterStart else Alignment.CenterEnd),
+            enter = androidx.compose.animation.slideInHorizontally(tween(220)) { if (playerLeft) -it / 3 else it / 3 } +
+                androidx.compose.animation.fadeIn(tween(180)),
+            exit = androidx.compose.animation.slideOutHorizontally(tween(180)) { if (playerLeft) -it / 3 else it / 3 } +
+                androidx.compose.animation.fadeOut(tween(140)),
+        ) {
+            val card = Modifier
+                .width(column)
+                .fillMaxHeight()
+                .padding(
+                    start = if (playerLeft) CARD_GAP else 0.dp,
+                    end = if (playerLeft) 0.dp else CARD_GAP,
+                    top = CARD_GAP,
+                    bottom = LocalNavBarInset.current + CARD_GAP,
+                )
+            if (shown.value == SidePanel.LYRICS) SideLyrics(now, card) else DockedPlayer(now, card)
         }
     }
 }
 
+/** The player takes one part in this many of the screen's width. */
+private const val PLAYER_SHARE = 3.6f
+
+/** Narrow enough to leave the map most of a small screen; on a wide one the map gets the extra room. */
+private val PLAYER_MIN_WIDTH = 240.dp
+private val PLAYER_MAX_WIDTH = 340.dp
+
+/** Between the player card and the screen's edges, and the map's own cards beside it. */
+private val CARD_GAP = 12.dp
+
+/** The card's corners: rounder than a button's, as the map app's own cards are. */
+private val CARD_SHAPE = RoundedCornerShape(24.dp)
+
 @Composable
 private fun MapPane(status: CarAppConnection.Status, frame: CarEnvironment.Frame) {
     val navigator = LocalCarNavigator.current
@@ -123,8 +158,11 @@ private fun MapPane(status: CarAppConnection.Status, frame: CarEnvironment.Frame
     }
 
     Column(
-        Modifier.fillMaxSize().padding(24.dp),
-        verticalArrangement = Arrangement.Center,
+        Modifier.fillMaxSize().padding(
+            start = if (LocalCardsAtEnd.current) LocalSidePanelInset.current else 0.dp,
+            end = if (LocalCardsAtEnd.current) 0.dp else LocalSidePanelInset.current,
+        ).padding(24.dp),
+        verticalArrangement = Arrangement.spacedBy(10.dp, Alignment.CenterVertically),
         horizontalAlignment = Alignment.CenterHorizontally,
     ) {
         val hasLast = CarSettings.lastNav.value != null
@@ -132,18 +170,19 @@ private fun MapPane(status: CarAppConnection.Status, frame: CarEnvironment.Frame
         val scope = androidx.compose.runtime.rememberCoroutineScope()
         when (status.phase) {
             CarAppConnection.Phase.BINDING, CarAppConnection.Phase.HANDSHAKE ->
-                Text("Starting ${status.app ?: "the map"}…", style = MaterialTheme.typography.titleMedium)
+                Text(status.app?.let { stringResource(R.string.home_starting, it) } ?: stringResource(R.string.home_starting_map), style = MaterialTheme.typography.titleMedium)
             CarAppConnection.Phase.REJECTED, CarAppConnection.Phase.FAILED -> {
-                Text("${status.app ?: "The map app"} would not start.", style = MaterialTheme.typography.titleMedium)
+                Text(status.app?.let { stringResource(R.string.home_failed, it) } ?: stringResource(R.string.home_failed_map), style = MaterialTheme.typography.titleMedium)
                 status.detail?.let { Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant) }
-                GsButton(onClick = navigator::apps, tone = GsTone.Tonal) { Text("Choose another app") }
+                Spacer(Modifier.height(8.dp))
+                StatusButton(stringResource(R.string.home_choose_app), GsTone.Primary, navigator::apps)
             }
             else -> if (!hasNavApps) {
                 // Nothing to auto-select and nothing to pick from Car apps either - this is the
                 // only case worth a distinct screen, since every other IDLE case resolves itself.
-                Text("No mapping apps found.", style = MaterialTheme.typography.titleMedium)
+                Text(stringResource(R.string.home_no_maps), style = MaterialTheme.typography.titleMedium)
                 Text(
-                    "Install a navigation app that supports Android Auto and it will start here on its own.",
+                    stringResource(R.string.home_no_maps_body),
                     style = MaterialTheme.typography.bodyMedium,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
@@ -151,9 +190,18 @@ private fun MapPane(status: CarAppConnection.Status, frame: CarEnvironment.Frame
                 // IDLE with a last app on record means the driver stopped it themselves - it will
                 // not come back on its own, so the screen must offer a way to bring it back rather
                 // than sit on a "starting" message that never resolves.
-                Text("Map stopped.", style = MaterialTheme.typography.titleMedium)
-                GsButton(onClick = { scope.launch { CarServices.reconnectNav(frame) } }, tone = GsTone.Tonal) { Text("Reopen") }
-                GsButton(onClick = { navigator.apps() }, tone = GsTone.Tonal) { Text("Car apps") }
+                Text(stringResource(R.string.home_map_stopped), style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
+                Text(
+                    stringResource(R.string.home_map_stopped_body),
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+                Spacer(Modifier.height(8.dp))
+                // Side by side, the same size, the likely one lit: one clear choice, not a stack.
+                Row(horizontalArrangement = Arrangement.spacedBy(14.dp)) {
+                    StatusButton(stringResource(R.string.home_reopen_map), GsTone.Primary) { scope.launch { CarServices.reconnectNav(frame) } }
+                    StatusButton(stringResource(R.string.home_car_apps), GsTone.Tonal) { navigator.apps() }
+                }
             } else {
                 // Autostart is still picking one - a navigation app is installed, so this resolves
                 // to a "Starting..." state itself, in the next frame or two.
@@ -162,9 +210,17 @@ private fun MapPane(status: CarAppConnection.Status, frame: CarEnvironment.Frame
     }
 }
 
+/** A big, even button for the map pane's few choices. */
+@Composable
+private fun StatusButton(label: String, tone: GsTone, onClick: () -> Unit) {
+    GsButton(onClick = onClick, tone = tone, modifier = Modifier.width(220.dp).height(64.dp)) {
+        Text(label, style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold)
+    }
+}
+
 /**
- * The player, docked beside the map: art, title, progress, transport, then like, shuffle, repeat
- * and lyrics. While it's here the nav bar's pill steps aside on Home, so the controls never show
+ * The player, docked beside the map: the art as large as it fits, then title, progress, transport,
+ * and like, shuffle, repeat and lyrics along the bottom. While it's here the nav bar's pill steps aside on Home, so the controls never show
  * twice. The X sends it back to the nav bar.
  */
 @Composable
@@ -175,28 +231,31 @@ private fun DockedPlayer(now: NowPlaying, modifier: Modifier) {
     val scheme = MaterialTheme.colorScheme
     val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
 
-    Surface(modifier = modifier, color = rememberArtColor(art, MaterialTheme.colorScheme.surfaceVariant)) {
-        BoxWithConstraints(Modifier.fillMaxSize().padding(12.dp)) {
-            // Whatever height the controls below leave over, so the art grows on a taller
-            // screen and shrinks rather than pushing the buttons off a short one.
-            val artSize = minOf(maxWidth - 44.dp, maxHeight - 250.dp).coerceIn(56.dp, 200.dp)
+    // The theme's surface, with a faint wash of the cover's colours behind the top of it. A solid
+    // slab of album colour beside the map fought it for attention; this only hints at the song.
+    Surface(modifier = modifier.gsPanelShadow(CARD_SHAPE), shape = CARD_SHAPE, color = scheme.surfaceContainer) {
+        AlbumGlow(art, Modifier.fillMaxSize())
+        Box(Modifier.fillMaxSize().padding(12.dp)) {
             Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally) {
-                Box(Modifier.fillMaxWidth()) {
+                // The cover gets everything the controls leave, as big a square as fits, sitting
+                // right on top of the title; the controls stay pinned to the bottom.
+                BoxWithConstraints(Modifier.weight(1f).fillMaxWidth(), contentAlignment = Alignment.BottomCenter) {
+                    val artSize = minOf(maxWidth, maxHeight).coerceAtLeast(0.dp)
                     // Art opens the full media screen, same as on the pill.
+                    val coverShape = RoundedCornerShape(16.dp)
                     Box(
                         Modifier
-                            .align(Alignment.TopCenter)
                             .size(artSize)
-                            .clip(RoundedCornerShape(12.dp))
+                            .gsPanelShadow(coverShape)
+                            .clip(coverShape)
                             .background(scheme.surface)
                             .clickable { navigator.media() },
                     ) {
-                        art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
+                        // A new song's cover fades in over the old one instead of cutting to it.
+                        androidx.compose.animation.Crossfade(art, animationSpec = tween(350), label = "cover") { shown ->
+                            shown?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
+                        }
                     }
-                    GsIconButton(
-                        Icons.Filled.Close, "Back to the nav bar", navigator::closeSidePanel,
-                        Modifier.align(Alignment.TopEnd), size = 36.dp, iconSize = 20.dp,
-                    )
                 }
                 Spacer(Modifier.height(10.dp))
                 Text(
@@ -212,46 +271,53 @@ private fun DockedPlayer(now: NowPlaying, modifier: Modifier) {
                 } else {
                     Spacer(Modifier.height(10.dp))
                 }
-                TransportRow(now, media, skip = 48.dp, modifier = Modifier.fillMaxWidth())
+                TransportRow(now, media, skip = 56.dp, modifier = Modifier.fillMaxWidth())
                 Spacer(Modifier.height(10.dp))
-                PlayModeRow(now, media, size = 42.dp, modifier = Modifier.fillMaxWidth()) {
+                PlayModeRow(now, media, size = 50.dp, modifier = Modifier.fillMaxWidth()) {
                     GsIconButton(
-                        ImageVector.vectorResource(R.drawable.lyrics_24), "Lyrics", navigator::showSideLyrics,
-                        size = 42.dp, iconSize = 22.dp,
+                        ImageVector.vectorResource(R.drawable.lyrics_24), stringResource(R.string.storage_lyrics), navigator::showSideLyrics,
+                        size = 50.dp, iconSize = 26.dp,
                     )
                 }
             }
+            GsIconButton(
+                Icons.Filled.Close, stringResource(R.string.home_back_nav), navigator::closeSidePanel,
+                Modifier.align(Alignment.TopEnd), size = 36.dp, iconSize = 20.dp,
+            )
         }
     }
 }
 
 /**
- * Lyrics alone beside the map, big enough to read at a glance. No art: that space goes to a
- * larger title and artist instead. The player goes back to the nav bar meanwhile, whose dock
- * button swaps these back out for the controls.
+ * Lyrics alone beside the map, big enough to read at a glance. The header is slim, since the
+ * player goes back to the nav bar meanwhile and names the song there. Its note button swaps the
+ * lyrics back for the player; the X closes the panel.
  */
 @Composable
 private fun SideLyrics(now: NowPlaying, modifier: Modifier) {
     val navigator = LocalCarNavigator.current
     val context = LocalContext.current
+    val scheme = MaterialTheme.colorScheme
     val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
-    Surface(modifier = modifier, color = rememberArtColor(art, MaterialTheme.colorScheme.surfaceVariant)) {
-        Column(Modifier.fillMaxSize().padding(16.dp)) {
-            Row(verticalAlignment = Alignment.Top) {
-                Column(Modifier.weight(1f)) {
-                    Text(
-                        now.title, style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold,
-                        maxLines = 2, overflow = TextOverflow.Ellipsis,
-                    )
-                    Text(
-                        now.artist, style = MaterialTheme.typography.titleMedium,
-                        color = MaterialTheme.colorScheme.onSurfaceVariant,
-                        maxLines = 1, overflow = TextOverflow.Ellipsis,
-                    )
+    Surface(modifier = modifier.gsPanelShadow(CARD_SHAPE), shape = CARD_SHAPE, color = scheme.surfaceContainer) {
+        Column(Modifier.fillMaxSize().padding(start = 18.dp, end = 12.dp, top = 12.dp, bottom = 8.dp)) {
+            Row(verticalAlignment = Alignment.CenterVertically) {
+                Box(Modifier.size(36.dp).clip(RoundedCornerShape(8.dp)).background(scheme.surface)) {
+                    art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
                 }
-                GsIconButton(Icons.Filled.Close, "Hide lyrics", navigator::closeSidePanel, size = 36.dp, iconSize = 20.dp)
+                Spacer(Modifier.size(10.dp))
+                Text(
+                    listOf(now.title, now.artist).filter { it.isNotEmpty() }.joinToString(" · "),
+                    Modifier.weight(1f),
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = scheme.onSurfaceVariant,
+                    maxLines = 1, overflow = TextOverflow.Ellipsis,
+                )
+                // The way back to the player, as the player's own Lyrics button is the way here.
+                GsIconButton(MediaIcons.MusicNote, stringResource(R.string.home_show_player), navigator::showSidePlayer, size = 36.dp, iconSize = 20.dp)
+                Spacer(Modifier.size(6.dp))
+                GsIconButton(Icons.Filled.Close, stringResource(R.string.home_hide_lyrics), navigator::closeSidePanel, size = 36.dp, iconSize = 20.dp)
             }
-            Spacer(Modifier.height(12.dp))
             LyricsPanel(now, Modifier.weight(1f).fillMaxWidth(), lineStyle = MaterialTheme.typography.headlineSmall)
         }
     }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarKeyboard.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
@@ -44,6 +46,12 @@ object CarKeyboardVisibility {
     val state = mutableStateOf(false)
 }
 
+/**
+ * True for the car UI the phone's own car preview draws. The phone is in hand there, so a
+ * [CarKeyboard] draws nothing and the phone's keyboard does the typing instead (see [PhoneTyping]).
+ */
+val LocalCarPreview = compositionLocalOf { false }
+
 /**
  * A keyboard the host draws itself.
  *
@@ -73,10 +81,11 @@ fun CarKeyboard(
 ) {
     var symbols by remember { mutableStateOf(false) }
     var shifted by remember { mutableStateOf(false) }
+    val preview = LocalCarPreview.current
 
-    DisposableEffect(Unit) {
-        CarKeyboardVisibility.state.value = true
-        onDispose { CarKeyboardVisibility.state.value = false }
+    DisposableEffect(preview) {
+        if (!preview) CarKeyboardVisibility.state.value = true
+        onDispose { if (!preview) CarKeyboardVisibility.state.value = false }
     }
 
     // The same field on the phone, for typing on its own keyboard: see [PhoneTyping].
@@ -88,6 +97,7 @@ fun CarKeyboard(
     }
     DisposableEffect(phoneField) { onDispose { PhoneTyping.close(phoneField) } }
     LaunchedEffect(text) { PhoneTyping.carText(phoneField, text) }
+    if (preview) return
 
     val rows = if (symbols) SYMBOL_ROWS else LETTER_ROWS
     val keyHeight = keyHeight(LocalConfiguration.current.screenHeightDp)
@@ -145,7 +155,7 @@ fun CarKeyboard(
                     horizontalArrangement = Arrangement.spacedBy(4.dp),
                 ) {
                     Key(if (symbols) "abc" else "?123", Modifier.weight(1.4f)) { symbols = !symbols }
-                    Key("space", Modifier.weight(if (onDismiss != null) 3.2f else 4f)) { onTextChange("$text ") }
+                    Key(stringResource(R.string.keyboard_space), Modifier.weight(if (onDismiss != null) 3.2f else 4f)) { onTextChange("$text ") }
                     if (onDismiss != null) {
                         DismissKey(onDismiss, Modifier.weight(1.4f))
                     }
@@ -192,7 +202,7 @@ private fun DismissKey(onClick: () -> Unit, modifier: Modifier = Modifier) {
             horizontalArrangement = Arrangement.Center,
             verticalAlignment = Alignment.CenterVertically,
         ) {
-            Icon(Icons.Filled.Close, contentDescription = "Hide keyboard")
+            Icon(Icons.Filled.Close, contentDescription = stringResource(R.string.keyboard_hide))
         }
     }
 }
@@ -212,7 +222,7 @@ private fun SubmitKey(modifier: Modifier, search: Boolean, image: ImageVector?,
         ) {
             Icon(
                 image ?: if (search) Icons.Filled.Search else Icons.Filled.ArrowBack,
-                contentDescription = "Submit",
+                contentDescription = stringResource(R.string.keyboard_submit),
             )
         }
     }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarLauncher.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.ExperimentalFoundationApi
@@ -119,35 +121,62 @@ internal object LauncherCache {
             context.packageManager.getApplicationIcon(pkg).toBitmap(128, 128).asImageBitmap()
         }.getOrNull()
 
-        val navApps = CarAppCatalog.installed(context)
-        val mediaApps = MediaCatalog.installed(context)
-        // Some apps (Spotify among them) ship both a Car App Library template and a legacy
-        // MediaBrowserService, which otherwise land as two identically-labeled tiles with no
-        // way to tell them apart. They're genuinely different screens - browsing versus Now
-        // Playing - so only the label needs disambiguating, not the tile itself.
-        val mediaPackages = mediaApps.map { it.component.packageName }.toSet()
+        val carApps = CarAppCatalog.installed(context).associateBy { it.component.packageName }
+        val mediaApps = MediaCatalog.installed(context).associateBy { it.component.packageName }
+        val messagingApps = MessagingCatalog.installed(context).associateBy { it.packageName }
 
-        val messagingApps = MessagingCatalog.installed(context)
-        // Google Messages ships its own car app, which won't start under Gearslip. Gearslip's
-        // own Messages screen does the same job, so a messenger gets only that tile.
-        val messagingPackages = messagingApps.map { it.packageName }.toSet()
-
-        val nav = navApps
-            .filter { it.component.packageName !in messagingPackages }
-            // An app whose template screen is rejected but whose player works through Gearslip
-            // (Spotify) shows only its player tile - a "· Browse" tile beside it would just report
-            // that the car screen isn't supported.
-            .filter { !(KnownApps.screenBroken(it.component.packageName) && KnownApps.playerWorks(it.component.packageName)) }
-            .map {
-                val label = if (it.component.packageName in mediaPackages) "${it.label} · Browse" else it.label
-                Entry(label, iconOf(it.component.packageName), template = it)
+        // One decision per app over everything it offers a car - a car screen, a player, car
+        // notifications - rather than a filter per kind that has to know about the others.
+        val tiles = (carApps.keys + mediaApps.keys + messagingApps.keys).flatMap { pkg ->
+            val icon by lazy { iconOf(pkg) }
+            tilesFor(carApps[pkg], mediaApps[pkg], messagingApps[pkg], context.getString(R.string.media_browse)).map { tile ->
+                when (tile) {
+                    is AppTile.Screen -> Entry(tile.label, icon, template = tile.app)
+                    is AppTile.Player -> Entry(tile.app.label, icon, media = tile.app)
+                    is AppTile.Messages -> Entry(tile.app.label, icon, messaging = tile.app)
+                }
             }
-        val media = mediaApps.map { Entry(it.label, iconOf(it.component.packageName), media = it) }
-        // A messenger that is also a car media app keeps only its player tile.
-        val messaging = messagingApps
-            .filter { it.packageName !in mediaPackages }
-            .map { Entry(it.label, iconOf(it.packageName), messaging = it) }
-        return (nav + media + messaging).sortedBy { it.label.lowercase() }.also { flow.value = it }
+        }
+        return tiles.sortedBy { it.label.lowercase() }.also { flow.value = it }
+    }
+}
+
+/** What one app gets on the launcher. */
+private sealed interface AppTile {
+    class Screen(val app: TemplateApp, val label: String) : AppTile
+    class Player(val app: app.seb3thehacker.gearslip.media.MediaApp) : AppTile
+    class Messages(val app: app.seb3thehacker.gearslip.notify.MessagingApp) : AppTile
+}
+
+/**
+ * The tiles for one app, from what it offers.
+ *
+ * - A car screen that is something other than media or messaging (RF Sentinel's POI screen) is
+ *   the app: its media service only makes sound, and its notifications are alerts, so it gets the
+ *   one tile under its own name.
+ * - A media app with both a car screen and a player (Spotify) gets both, the screen labelled
+ *   "· Browse", since they really are different screens - unless the screen is known to refuse
+ *   Gearslip while the player works, when the Browse tile would only report that.
+ * - A messenger's own car screen (Google Messages) won't start under Gearslip, and Gearslip's
+ *   Messages screen does the job, so it gets only that - and a messenger that is also a media
+ *   app keeps only its player.
+ */
+private fun tilesFor(
+    car: TemplateApp?,
+    media: app.seb3thehacker.gearslip.media.MediaApp?,
+    messaging: app.seb3thehacker.gearslip.notify.MessagingApp?,
+    browse: String,
+): List<AppTile> {
+    if (car != null && !car.isMediaScreen && car.kind != "messaging") return listOf(AppTile.Screen(car, car.label))
+    val pkg = car?.component?.packageName ?: media?.component?.packageName ?: messaging?.packageName ?: return emptyList()
+    return buildList {
+        val screenRefused = KnownApps.screenBroken(pkg) && KnownApps.playerWorks(pkg)
+        val messengerScreen = messaging != null && (car?.kind == "messaging" || car?.kind == "app")
+        if (car != null && !messengerScreen && !(media != null && screenRefused)) {
+            add(AppTile.Screen(car, if (media != null) "${car.label} · $browse" else car.label))
+        }
+        if (media != null) add(AppTile.Player(media))
+        else if (messaging != null) add(AppTile.Messages(messaging))
     }
 }
 
@@ -156,10 +185,13 @@ internal object LauncherCache {
 internal fun rememberAllEntries(): List<Entry> {
     val context = LocalContext.current
     val installed by LauncherCache.state.collectAsState()
+    val launcher by LauncherMode.active.collectAsState()
     LaunchedEffect(context) {
         if (LauncherCache.entries == null) withContext(Dispatchers.IO) { LauncherCache.load(context) }
     }
-    return remember(installed) { BuiltInApps.entries + installed.orEmpty() }
+    return remember(installed, launcher) {
+        BuiltInApps.entries(launcher, LauncherMode.canCall(context)) + installed.orEmpty()
+    }
 }
 
 /** The launcher's groups, in the order they're laid out. */
@@ -195,9 +227,10 @@ private fun groupOf(entry: Entry, mediaPackages: Set<String>): AppGroup {
  * The launcher's tiles in the order they're drawn: grouped by [AppGroup], alphabetical inside a
  * group with Settings last of all, then with the driver's own moves from [custom] laid over it.
  * Moved apps only trade places among themselves, so an app installed later still lands in its group.
+ * [hidden] leaves tiles out of the drawer only: a pinned app stays on the nav bar.
  */
-internal fun launcherOrder(all: List<Entry>, showVehicleData: Boolean, custom: List<String>): List<Entry> {
-    val shown = all.filter { it.builtIn !== BuiltInApps.VehicleData || showVehicleData }
+internal fun launcherOrder(all: List<Entry>, showVehicleData: Boolean, custom: List<String>, hidden: Set<String>): List<Entry> {
+    val shown = all.filter { (it.builtIn !== BuiltInApps.VehicleData || showVehicleData) && it.componentId !in hidden }
     val mediaPackages = shown.mapNotNull { it.media?.component?.packageName }.toSet()
     val grouped = shown.sortedWith(
         compareBy<Entry>({ groupOf(it, mediaPackages) }, { it.builtIn === BuiltInApps.Settings }, { it.label.lowercase() }),
@@ -211,7 +244,7 @@ internal fun launcherOrder(all: List<Entry>, showVehicleData: Boolean, custom: L
 
 /** An app by the id a pin or the running list knows it by, built-in or installed. */
 internal fun findEntry(id: String): Entry? =
-    BuiltInApps.entries.find { it.componentId == id } ?: LauncherCache.entries?.find { it.componentId == id }
+    BuiltInApps.everyEntry.find { it.componentId == id } ?: LauncherCache.entries?.find { it.componentId == id }
 
 /** Rescans the car and media apps now, replacing the cached list; the launcher keeps showing the old one meanwhile. */
 fun warmLauncherApps(context: Context) { LauncherCache.load(context, force = true) }
@@ -239,6 +272,7 @@ internal fun launchEntry(entry: Entry, navigator: CarNavigator, frame: CarEnviro
 /** The app launcher: every app as an icon grid, grouped Phone, Maps, Music, Messaging, Web, Screen sharing, Settings. */
 @Composable
 fun CarLauncher() {
+    val context = LocalContext.current
     val navigator = LocalCarNavigator.current
     val frame by CarEnvironment.frame.collectAsState()
 
@@ -253,14 +287,15 @@ fun CarLauncher() {
         val pkg = entry.packageName?.takeIf { entry.messaging == null }
         val id = entry.componentId
         return Tile(
-            entry.label, entry.icon, entry.builtIn?.glyph,
-            broken = pkg != null && (KnownApps.isBroken(pkg) || (entry.template != null && KnownApps.screenBroken(pkg))),
+            entry.builtIn?.let { context.getString(it.labelRes) } ?: entry.label, entry.icon, entry.builtIn?.glyph,
+            broken = pkg != null && (KnownApps.isBroken(context, pkg) || (entry.template != null && KnownApps.screenBroken(pkg))),
             onLongClick = id?.let { { navigator.showAppMenu(it) } },
         ) { openApp(entry, id?.let { running[it] }, navigator, frame) }
     }
 
     val appOrder by CarSettings.appOrder.collectAsState()
-    val tiles = launcherOrder(all, showVehicleData, appOrder).map(::tileOf)
+    val hidden by CarSettings.hiddenApps.collectAsState()
+    val tiles = launcherOrder(all, showVehicleData, appOrder, hidden).map(::tileOf)
 
     LazyVerticalGrid(
         columns = GridCells.Adaptive(minSize = 108.dp),
@@ -280,7 +315,7 @@ private fun BrokenBadge(size: androidx.compose.ui.unit.Dp, modifier: Modifier =
         modifier.size(size).background(Color(0xFFD32F2F), CircleShape),
         contentAlignment = Alignment.Center,
     ) {
-        Icon(Icons.Filled.Close, contentDescription = "Doesn't work with Gearslip", tint = Color.White, modifier = Modifier.size(size * 0.66f))
+        Icon(Icons.Filled.Close, contentDescription = stringResource(R.string.launcher_broken), tint = Color.White, modifier = Modifier.size(size * 0.66f))
     }
 }
 

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarNavBar.kt

@@ -0,0 +1,691 @@
+package app.seb3thehacker.gearslip.car
+
+import androidx.compose.ui.res.stringResource
+import androidx.compose.material.icons.filled.Call
+import app.seb3thehacker.gearslip.call.CarCalls
+import app.seb3thehacker.gearslip.call.CallUiState
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.LocalIndication
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.offset
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.background
+import androidx.compose.foundation.gestures.detectTapGestures
+import androidx.compose.ui.graphics.lerp
+import androidx.compose.ui.graphics.Brush
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.border
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.foundation.layout.BoxScope
+import androidx.car.app.model.CarIcon
+import androidx.car.app.navigation.model.NavigationTemplate
+import androidx.car.app.navigation.model.RoutingInfo
+import app.seb3thehacker.gearslip.host.CarAppConnection
+import app.seb3thehacker.gearslip.host.display
+import app.seb3thehacker.gearslip.host.text
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.ui.hapticfeedback.HapticFeedback
+import androidx.compose.ui.hapticfeedback.HapticFeedbackType
+import androidx.compose.ui.platform.LocalHapticFeedback
+import androidx.compose.ui.platform.LocalView
+import androidx.compose.runtime.State
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.animation.animateContentSize
+import android.media.session.PlaybackState
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.input.pointer.PointerEventPass
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.res.vectorResource
+import androidx.compose.ui.text.style.TextOverflow
+import app.seb3thehacker.gearslip.R
+import app.seb3thehacker.gearslip.notify.PhoneNavigation
+import app.seb3thehacker.gearslip.car.theme.GsColors
+import app.seb3thehacker.gearslip.car.theme.withTintedSurfaces
+import app.seb3thehacker.gearslip.car.theme.GsIconBox
+import app.seb3thehacker.gearslip.car.theme.GsIconButton
+import app.seb3thehacker.gearslip.car.theme.GsButton
+import app.seb3thehacker.gearslip.car.theme.GsTone
+import app.seb3thehacker.gearslip.car.theme.gsColors
+import app.seb3thehacker.gearslip.car.theme.GsThemes
+import app.seb3thehacker.gearslip.car.theme.LocalGsTheme
+import app.seb3thehacker.gearslip.media.CarMedia
+import app.seb3thehacker.gearslip.media.MediaArt
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.dp
+import app.seb3thehacker.gearslip.notify.CarNotifications
+import androidx.core.graphics.drawable.toBitmap
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.withContext
+import java.text.DateFormat
+import java.util.Date
+
+// The nav bar along the bottom of the car screen: home, apps, the assistant, running apps,
+// the next turn or a call, the player, and the clock. Split out of CarUi.kt.
+
+/**
+ * "Home > Apps > Settings", like a file manager's address bar: hidden at Home itself (nothing to
+ * show yet), and grows by one crumb for every screen pushed from there. The back arrow undoes one
+ * step; a crumb jumps straight to it, dropping everything after - this is the only on-screen way
+ * back at all, since a car touchscreen has no hardware button for it.
+ */
+@Composable
+private fun BreadcrumbBar(navigator: CarNavigator) {
+    val trail = navigator.trail
+    if (trail.size <= 1) return
+    Row(
+        Modifier.fillMaxWidth().height(40.dp).padding(start = 2.dp, end = 10.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, stringResource(R.string.back), navigator::back, size = 32.dp, iconSize = 20.dp)
+        Spacer(Modifier.width(2.dp))
+        trail.forEachIndexed { index, crumb ->
+            val isLast = index == trail.lastIndex
+            Text(
+                crumb.shown(),
+                style = MaterialTheme.typography.labelLarge,
+                fontWeight = if (isLast) FontWeight.SemiBold else FontWeight.Normal,
+                color = if (isLast) MaterialTheme.colorScheme.onSurface else MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+                modifier = if (isLast) Modifier else Modifier
+                    .clip(RoundedCornerShape(6.dp))
+                    .clickable { navigator.jumpTo(index) }
+                    .padding(horizontal = 4.dp, vertical = 2.dp),
+            )
+            if (!isLast) {
+                Text(
+                    "›",
+                    style = MaterialTheme.typography.labelLarge,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    modifier = Modifier.padding(horizontal = 2.dp),
+                )
+            }
+        }
+    }
+}
+
+/**
+ * Apps and open/pinned shortcuts on the left; now-playing pill against them; clock (tap for
+ * calendar and weather), phone battery and the darkness signal on the right. Icon-only: a driver
+ * reads a glyph faster than a label, and it keeps the bar short enough to leave the app underneath
+ * more room.
+ */
+@Composable
+internal fun CarNavBar(navigator: CarNavigator) {
+    val battery by CarEnvironment.battery.collectAsState()
+    val now by rememberNow()
+    val weather by Weather.state.collectAsState()
+    val weatherData = (weather as? WeatherState.Ready)?.data
+
+    val pinnedIds by CarSettings.pinnedApps.collectAsState()
+    val entries = rememberAllEntries()
+    val pinnedEntries = remember(entries, pinnedIds) {
+        pinnedIds.mapNotNull { id -> entries.find { it.componentId == id } }
+    }
+    val frame by CarEnvironment.frame.collectAsState()
+    val running = rememberRunningApps()
+
+    // A full-width strip along the bottom in the screens' own background, so it reads as part of
+    // the screen above rather than a panel on it. Over the player it's see-through, so the
+    // cover's glow carries on behind it.
+    val overPlayer = navigator.current == CarScreen.Media
+    Surface(color = if (overPlayer) androidx.compose.ui.graphics.Color.Transparent else MaterialTheme.colorScheme.background) {
+        BoxWithConstraints(Modifier.fillMaxWidth().height(NAV_BAR_HEIGHT).padding(horizontal = 10.dp)) {
+            Row(Modifier.fillMaxSize(), verticalAlignment = Alignment.CenterVertically) {
+                // Home and Apps are two different places now, not a toggle on one button - the
+                // breadcrumb trail is how you retrace your steps, but reaching for either of
+                // these two from three screens deep in a media app shouldn't mean reading it
+                // first.
+                NavHomeButton(navigator, entries, running)
+                Spacer(Modifier.width(6.dp))
+                NavItem(MediaIcons.Apps, navigator.current == CarScreen.Apps) { navigator.apps() }
+                Spacer(Modifier.width(6.dp))
+                NavAssistantIcon()
+
+                // Pinned shortcuts, then whatever else is open right now. A pinned app that's also
+                // open stays in its pinned spot, marked with a dot, instead of showing up twice.
+                // The map app lives on the Home button, so it never gets a second icon here.
+                val runningEntries = running.keys
+                    .filter { it !in pinnedIds && running[it] != RunningSlot.NAV }
+                    .mapNotNull { id -> entries.find { it.componentId == id } }
+                val shownPins = pinnedEntries.filter { running[it.componentId] != RunningSlot.NAV }
+                if (shownPins.isNotEmpty() || runningEntries.isNotEmpty()) NavDivider()
+                shownPins.forEach { entry -> NavEntryIcon(entry, running, navigator, frame) }
+                if (shownPins.isNotEmpty() && runningEntries.isNotEmpty()) NavDivider()
+                runningEntries.forEach { entry -> NavEntryIcon(entry, running, navigator, frame) }
+
+                // Next turn first, off the map only; the player shares the space when it fits,
+                // and gives way to the turn when it doesn't.
+                // A call takes the player's place until it ends.
+                // A turn from the phone has no map in the car to show it, so it shows on Home too.
+                val turn = rememberNextTurn()?.takeIf { it.fromPhone || navigator.current != CarScreen.Home }
+                val call = CarCalls.state.collectAsState().value as? CallUiState.Active
+                BoxWithConstraints(Modifier.weight(1f).padding(horizontal = 16.dp), contentAlignment = Alignment.Center) {
+                    val roomForBoth = maxWidth >= TURN_AND_PLAYER_MIN_WIDTH
+                    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(10.dp)) {
+                        if (call == null || roomForBoth) turn?.let { NavTurnPill(it) { if (!it.fromPhone) navigator.home() } }
+                        if (call != null) {
+                            NavCallPill(call, Modifier.weight(1f, fill = false))
+                        } else if (turn == null || roomForBoth) {
+                            NavNowPlaying(navigator, selected = navigator.current == CarScreen.Media, modifier = Modifier.weight(1f, fill = false))
+                        }
+                    }
+                }
+
+                // Weather no longer has its own chip - the temperature alone (no icon, no room
+                // for one) sits where "Night"/"Day" used to, freeing a whole chip's width for the
+                // Home button above.
+                // The clock is also the notifications button: the dashboard lists them under the
+                // calendar and weather, and a dot here marks anything unread.
+                val unread by CarNotifications.unread.collectAsState()
+                NavChip(
+                    navigator.current == CarScreen.Dashboard || navigator.current is CarScreen.Notifications,
+                    { navigator.dashboard() },
+                ) {
+                    if (unread > 0) {
+                        Box(
+                            Modifier
+                                .align(Alignment.TopEnd)
+                                .offset(x = 8.dp, y = (-2).dp)
+                                .size(8.dp)
+                                .clip(CircleShape)
+                                .background(MaterialTheme.colorScheme.primary),
+                        )
+                    }
+                    Column(horizontalAlignment = Alignment.End) {
+                        Text(
+                            DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(now)),
+                            style = MaterialTheme.typography.titleMedium,
+                            fontWeight = FontWeight.SemiBold,
+                        )
+                        Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(3.dp)) {
+                            if (battery.percent >= 0) {
+                                Text(
+                                    "${battery.percent}%",
+                                    style = MaterialTheme.typography.labelMedium,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                                )
+                                if (battery.charging) {
+                                    ChargingGlyph(Modifier.size(13.dp))
+                                }
+                            }
+                            weatherData?.let { w ->
+                                Text(
+                                    "  ·  ${w.temp}°",
+                                    style = MaterialTheme.typography.labelMedium,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                                )
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Home: the map, with the player or lyrics beside it. While a map app runs, the button wears that
+ * app's icon and a long press offers to close it, so the app needs no icon of its own on the bar.
+ */
+@Composable
+private fun NavHomeButton(navigator: CarNavigator, entries: List<Entry>, running: Map<String, RunningSlot>) {
+    val selected = navigator.current == CarScreen.Home
+    val navId = running.entries.firstOrNull { it.value == RunningSlot.NAV }?.key
+    val navEntry = navId?.let { id -> entries.find { it.componentId == id } }
+    GsIconBox(
+        { navigator.home() },
+        colors = navColors(selected),
+        latched = selected,
+        onLongClick = navId?.let { id -> { navigator.showAppMenu(id) } },
+    ) {
+        val icon = navEntry?.icon
+        if (icon != null) {
+            Box(Modifier.padding(NAV_ITEM_PADDING).size(28.dp), contentAlignment = Alignment.Center) {
+                Image(icon, navEntry.label, Modifier.size(28.dp).clip(RoundedCornerShape(7.dp)))
+            }
+        } else {
+            Icon(
+                ImageVector.vectorResource(R.drawable.navigation_24), contentDescription = stringResource(R.string.crumb_home),
+                modifier = Modifier.padding(NAV_ITEM_PADDING).size(28.dp),
+            )
+        }
+    }
+}
+
+/** Splits the nav bar's sections: Home and Apps, pinned apps, open apps. */
+@Composable
+private fun NavDivider() {
+    Box(
+        Modifier
+            .padding(horizontal = 10.dp)
+            .width(1.dp)
+            .height(28.dp)
+            .background(MaterialTheme.colorScheme.outlineVariant),
+    )
+}
+
+/**
+ * A pinned or open app on the nav bar. Tapping brings it back without reconnecting if it's
+ * already open; a long press opens its menu (pin, unpin, close).
+ */
+@Composable
+private fun NavEntryIcon(
+    entry: Entry,
+    running: Map<String, RunningSlot>,
+    navigator: CarNavigator,
+    frame: CarEnvironment.Frame,
+) {
+    val id = entry.componentId ?: return
+    val slot = running[id]
+    Box(Modifier.padding(horizontal = 3.dp)) {
+        NavAppIcon(
+            entry,
+            open = slot != null,
+            showing = slot != null && slot.isShowing(navigator.current),
+            onLongClick = { navigator.showAppMenu(id) },
+        ) { openApp(entry, slot, navigator, frame) }
+    }
+}
+
+/** One open or pinned app's icon on the nav bar - the same fixed size and shape either way. */
+@Composable
+private fun NavAppIcon(
+    entry: Entry,
+    open: Boolean,
+    showing: Boolean,
+    onLongClick: () -> Unit,
+    onClick: () -> Unit,
+) {
+    val scheme = MaterialTheme.colorScheme
+    GsIconBox(
+        onClick,
+        Modifier.size(44.dp),
+        colors = if (showing) GsColors(scheme.secondaryContainer, scheme.onSecondaryContainer)
+        else GsColors(scheme.surfaceVariant, scheme.onSurfaceVariant),
+        latched = showing,
+        onLongClick = onLongClick,
+    ) {
+        entry.icon?.let { Image(it, entry.label, Modifier.size(30.dp).clip(RoundedCornerShape(8.dp))) }
+        entry.builtIn?.let { Icon(it.glyph, entry.shownLabel(), Modifier.size(26.dp)) }
+        // Only running apps get the line along the bottom edge, the usual taskbar mark for it.
+        if (open) {
+            Box(
+                Modifier
+                    .align(Alignment.BottomCenter)
+                    .padding(bottom = 2.dp)
+                    .size(width = 12.dp, height = 3.dp)
+                    .clip(RoundedCornerShape(50))
+                    .background(scheme.primary),
+            )
+        }
+    }
+}
+
+/** A tappable group in the bar that stays highlighted while its screen is open, like [NavItem]. */
+@Composable
+private fun NavChip(selected: Boolean, onClick: () -> Unit, content: @Composable BoxScope.() -> Unit) {
+    GsIconBox(onClick, colors = navColors(selected), latched = selected) {
+        Box(Modifier.padding(horizontal = 10.dp, vertical = 2.dp)) { content() }
+    }
+}
+
+/** Every nav bar item is raised, so it reads as pressable; the current screen's takes the accent colour. */
+@Composable
+private fun navColors(selected: Boolean): GsColors {
+    val s = MaterialTheme.colorScheme
+    return if (selected) GsColors(s.secondaryContainer, s.onSecondaryContainer)
+    else GsColors(s.surfaceContainerHighest, s.onSurface)
+}
+
+/**
+ * Between Apps and whatever's actually open, not with the clock/battery group on the right - a
+ * driver reaches for it right after deciding "not a tap for this", same gesture family as the
+ * two buttons beside it.
+ */
+@Composable
+private fun NavAssistantIcon() {
+    val state by CarAssistant.state.collectAsState()
+    val active = state.phase != CarAssistant.Phase.IDLE
+    GsIconBox({ CarAssistant.start() }, colors = navColors(active), latched = active) {
+        MicGlyph(Modifier.padding(NAV_ITEM_PADDING).size(28.dp))
+    }
+}
+
+/** Inner padding of every icon on the nav bar, leaving each button room inside the 56dp bar. */
+private val NAV_ITEM_PADDING = 8.dp
+
+@Composable
+private fun NavItem(icon: ImageVector, selected: Boolean, onClick: () -> Unit) {
+    GsIconBox(onClick, colors = navColors(selected), latched = selected) {
+        Icon(icon, contentDescription = null, modifier = Modifier.padding(NAV_ITEM_PADDING).size(28.dp))
+    }
+}
+
+/** Wall-clock time, ticking on the minute: no reason to redraw (and re-encode) more often. */
+@Composable
+internal fun rememberNow(): State<Long> = produceState(System.currentTimeMillis()) {
+    while (true) {
+        value = System.currentTimeMillis()
+        delay(60_000 - value % 60_000)
+    }
+}
+
+/** How long the pill shows a new song's title before settling to just the controls. */
+private const val TITLE_SHOWN_MS = 3_000L
+
+/** Below this, the nav bar's middle only has room for the turn, not the player beside it. */
+private val TURN_AND_PLAYER_MIN_WIDTH = 520.dp
+
+/** The next manoeuvre, as the running nav app last described it, or [fromPhone] a map guiding on the phone. */
+private class NextTurn(val icon: CarIcon?, val distance: String, val road: String, val fromPhone: Boolean = false)
+
+/**
+ * Read straight off the nav app's own template: a navigation app keeps sending its routing card
+ * while it's running, whether or not the map is the screen being shown.
+ */
+@Composable
+private fun rememberNextTurn(): NextTurn? {
+    val status by CarServices.nav.status.collectAsState()
+    val template by CarServices.nav.template.collectAsState()
+    // Read so a change of units redraws the distance straight away, not at the next update.
+    CarSettings.units.collectAsState().value
+    val phone by PhoneNavigation.turn.collectAsState()
+    val routing = ((template as? NavigationTemplate)?.navigationInfo as? RoutingInfo)
+        ?.takeIf { status.phase == CarAppConnection.Phase.RUNNING }
+    val step = routing?.takeIf { !it.isLoading }?.currentStep ?: return phone?.let { phoneTurn(it) }
+    return NextTurn(
+        icon = step.maneuver?.icon,
+        distance = routing.currentDistance.display(),
+        road = step.road.text().ifEmpty { step.cue.text() },
+    )
+}
+
+/** Google Maps' or Waze's own arrow, and the distance as the app wrote it. */
+@Composable
+private fun phoneTurn(turn: PhoneNavigation.Turn): NextTurn {
+    val icon = remember(turn.arrow) {
+        turn.arrow?.let { CarIcon.Builder(androidx.core.graphics.drawable.IconCompat.createWithBitmap(it)).build() }
+    }
+    return NextTurn(icon, turn.distance?.display() ?: turn.distanceText, turn.road, fromPhone = true)
+}
+
+/** The next turn in the nav bar: arrow, how far, onto what. Tapping goes back to the map. */
+@Composable
+private fun NavTurnPill(turn: NextTurn, onClick: () -> Unit) {
+    // Same finish as every other button on the bar, in the accent colour; the text runs a step
+    // bigger than anything else there, since it's the one thing worth a glance mid-drive.
+    GsIconBox(
+        onClick,
+        Modifier.widthIn(max = 340.dp).height(44.dp),
+        colors = gsColors(GsTone.Primary),
+    ) {
+        Row(
+            Modifier.padding(NAV_ITEM_PADDING),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            CarGlyph(turn.icon, Modifier.size(28.dp))
+            if (turn.distance.isNotEmpty()) {
+                Text(turn.distance, style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold, maxLines = 1)
+            }
+            if (turn.road.isNotEmpty()) {
+                Text(
+                    turn.road,
+                    style = MaterialTheme.typography.titleMedium,
+                    fontWeight = FontWeight.SemiBold,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
+        }
+    }
+}
+
+/** The call under way: who, how long, and Mute and End right here. Ringing has its own screen. */
+@Composable
+private fun NavCallPill(call: CallUiState.Active, modifier: Modifier = Modifier) {
+    val context = LocalContext.current.applicationContext
+    val muted by CarCalls.muted.collectAsState()
+    val elapsed by produceState(0L, call.since) {
+        while (true) {
+            value = (android.os.SystemClock.uptimeMillis() - call.since) / 1000
+            delay(1000 - (android.os.SystemClock.uptimeMillis() - call.since) % 1000)
+        }
+    }
+    val scheme = MaterialTheme.colorScheme
+    Surface(
+        modifier = modifier.height(44.dp),
+        shape = RoundedCornerShape(14.dp),
+        color = scheme.secondaryContainer,
+        contentColor = scheme.onSecondaryContainer,
+    ) {
+        Row(
+            Modifier.fillMaxHeight().padding(start = 12.dp, end = 4.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(6.dp),
+        ) {
+            Icon(Icons.Filled.Call, contentDescription = null, modifier = Modifier.size(20.dp))
+            Text(
+                call.caller?.label ?: stringResource(R.string.navbar_on_call),
+                style = MaterialTheme.typography.titleSmall,
+                fontWeight = FontWeight.SemiBold,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+                modifier = Modifier.weight(1f, fill = false),
+            )
+            Text(
+                "%d:%02d".format(elapsed / 60, elapsed % 60),
+                style = MaterialTheme.typography.titleSmall,
+                maxLines = 1,
+            )
+            Spacer(Modifier.width(2.dp))
+            GsIconButton(
+                if (muted) MediaIcons.MicOff else MediaIcons.Mic,
+                stringResource(if (muted) R.string.navbar_unmute else R.string.navbar_mute),
+                CarCalls::toggleMute,
+                tone = if (muted) GsTone.Primary else GsTone.Neutral, size = 36.dp, iconSize = 22.dp,
+            )
+            GsIconButton(
+                MediaIcons.CallEnd, stringResource(R.string.navbar_end_call), { CarCalls.end(context) },
+                colors = GsColors(scheme.error, scheme.onError), size = 36.dp, iconSize = 22.dp,
+            )
+        }
+    }
+}
+
+/** "Title - Artist" on one line. The text itself cuts it off, and only where the pill runs out of room. */
+@Composable
+private fun nowPlayingLabel(title: String, artist: String): String =
+    listOf(title.trim(), artist.trim()).filter { it.isNotEmpty() }.joinToString(" - ")
+        .ifEmpty { stringResource(R.string.media_nothing_playing) }
+
+/**
+ * The player in the nav bar, on every screen. Art and title open the full media screen;
+ * play/pause and skip work right here. The dock button moves the player into the column beside
+ * the map on Home (see [CarHome]), and the pill steps aside there while it's docked - unless the
+ * column is showing lyrics instead, when the pill stays and its dock button closes them.
+ */
+@Composable
+private fun NavNowPlaying(navigator: CarNavigator, selected: Boolean, modifier: Modifier = Modifier) {
+    val media = CarServices.media
+    val phase by media.phase.collectAsState()
+    val now by media.now.collectAsState()
+    if (phase != CarMedia.Phase.READY || !now.isActive) return
+    // Docked beside the map, the player is already on screen - the pill steps aside for it.
+    if (navigator.sidePanel == SidePanel.CONTROLS && navigator.current == CarScreen.Home) return
+    // The media screen is the full player already; the pill would only repeat its controls.
+    if (navigator.current == CarScreen.Media) return
+    val context = LocalContext.current
+    val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
+    val position by produceState(now.currentPosition(), now) {
+        while (true) {
+            value = now.currentPosition()
+            if (!now.playing) break
+            delay(1000)
+        }
+    }
+
+    // A new song announces itself: title, play/pause and dock for a few seconds, then the title
+    // goes and the pill settles to just the controls - unless the driver keeps the title up.
+    val keepTitle by CarSettings.playerTitle.collectAsState()
+    var announcing by remember { mutableStateOf(true) }
+    LaunchedEffect(now.title, now.artist) {
+        announcing = true
+        delay(TITLE_SHOWN_MS)
+        announcing = false
+    }
+    val showTitle = keepTitle || announcing
+
+    val scheme = MaterialTheme.colorScheme
+    val onPill = if (selected) scheme.onPrimaryContainer else scheme.onSecondaryContainer
+    Surface(
+        modifier = modifier
+            .animateContentSize()
+            // With the title up, all the room the bar has, so as much of it shows as can.
+            .then(if (showTitle) Modifier.fillMaxWidth() else Modifier)
+            .height(44.dp),
+        shape = RoundedCornerShape(14.dp),
+        color = if (selected) scheme.primaryContainer else scheme.secondaryContainer,
+        contentColor = onPill,
+    ) {
+        Box {
+            Row(
+                Modifier.fillMaxHeight().padding(horizontal = 4.dp),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(6.dp),
+            ) {
+                // Art (and the title while it shows) opens the full media screen.
+                Row(
+                    Modifier
+                        .then(if (showTitle) Modifier.weight(1f) else Modifier)
+                        .fillMaxHeight()
+                        .clip(RoundedCornerShape(10.dp))
+                        .clickable { navigator.media() },
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                ) {
+                    Box(Modifier.size(34.dp).clip(RoundedCornerShape(8.dp)).background(scheme.surfaceVariant)) {
+                        art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
+                    }
+                    if (showTitle) {
+                        Text(
+                            nowPlayingLabel(now.title, now.artist),
+                            style = MaterialTheme.typography.titleSmall,
+                            fontWeight = FontWeight.SemiBold,
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis,
+                        )
+                    }
+                }
+                if (!showTitle) {
+                    GsIconButton(
+                        MediaIcons.Previous, stringResource(R.string.player_previous), media::previous,
+                        enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_PREVIOUS), size = 36.dp, iconSize = 22.dp,
+                    )
+                }
+                GsIconButton(
+                    if (now.playing) MediaIcons.Pause else Icons.Filled.PlayArrow,
+                    stringResource(if (now.playing) R.string.player_pause else R.string.media_play),
+                    media::togglePlay,
+                    tone = GsTone.Primary, size = 36.dp, iconSize = 22.dp,
+                )
+                if (!showTitle) {
+                    GsIconButton(
+                        MediaIcons.Next, stringResource(R.string.player_next), media::next,
+                        enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_NEXT), size = 36.dp, iconSize = 22.dp,
+                    )
+                }
+                // Drawn on the side the panel opens on, and filled in while it's open.
+                val playerLeft by CarSettings.playerLeft.collectAsState()
+                val docked = navigator.current == CarScreen.Home && navigator.sidePanel != SidePanel.NONE
+                GsIconButton(
+                    when {
+                        playerLeft && docked -> MediaIcons.DockLeftOpen
+                        playerLeft -> MediaIcons.DockLeft
+                        docked -> MediaIcons.DockRightOpen
+                        else -> MediaIcons.DockRight
+                    },
+                    stringResource(if (docked) R.string.navbar_close_panel else R.string.navbar_dock_player),
+                    navigator::togglePlayerDock,
+                    size = 36.dp, iconSize = 22.dp,
+                )
+            }
+            if (now.durationMs > 0) {
+                // matchParentSize, so the line follows the pill's width rather than widening it.
+                Box(Modifier.matchParentSize(), contentAlignment = Alignment.BottomStart) {
+                    Box(
+                        Modifier
+                            .fillMaxWidth((position.toFloat() / now.durationMs).coerceIn(0f, 1f))
+                            .height(2.dp)
+                            .background(onPill.copy(alpha = 0.7f)),
+                    )
+                }
+            }
+        }
+    }
+}
+
+/**
+ * A filled lightning bolt, next to the battery percentage instead of the word "charging" - the
+ * core Material icon set this project ships (no extended pack, to keep the app small) has no
+ * bolt, so this is drawn rather than a vector asset.
+ */
+@Composable
+private fun ChargingGlyph(modifier: Modifier = Modifier, tint: Color = MaterialTheme.colorScheme.onSurfaceVariant) {
+    androidx.compose.foundation.Canvas(modifier) {
+        val w = size.width
+        val h = size.height
+        val bolt = androidx.compose.ui.graphics.Path().apply {
+            moveTo(w * 0.58f, 0f)
+            lineTo(w * 0.12f, h * 0.58f)
+            lineTo(w * 0.46f, h * 0.58f)
+            lineTo(w * 0.42f, h)
+            lineTo(w * 0.88f, h * 0.40f)
+            lineTo(w * 0.54f, h * 0.40f)
+            close()
+        }
+        drawPath(bolt, tint)
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarNavigator.kt

@@ -1,5 +1,9 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.runtime.Composable
+import androidx.annotation.StringRes
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
@@ -41,7 +45,11 @@ sealed interface CarScreen {
 enum class SidePanel { NONE, CONTROLS, LYRICS }
 
 /** One step on the breadcrumb trail: the screen it shows and the word for it in the trail. */
-data class Crumb(val screen: CarScreen, val label: String)
+data class Crumb(val screen: CarScreen, val label: String, @param:StringRes val labelRes: Int = 0) {
+    /** [labelRes] when the step is one of Gearslip's own, translated; [label] for an app's own name. */
+    @Composable
+    fun shown(): String = if (labelRes != 0) stringResource(labelRes) else label
+}
 
 /**
  * Where the car UI is, and how it got there. A car touchscreen has no hardware back button, so
@@ -57,6 +65,7 @@ class CarNavigator(startId: String) {
         Crumb(
             if (CarApps.find(startId) != null) CarScreen.App(startId) else CarScreen.Home,
             "Home",
+            R.string.crumb_home,
         ),
     )
 
@@ -69,15 +78,15 @@ class CarNavigator(startId: String) {
 
     /** Pushes a new step, unless it's the same screen already on top - tapping the button for
      * where you already are shouldn't grow the trail. */
-    private fun push(screen: CarScreen, label: String) {
+    private fun push(screen: CarScreen, label: String, @StringRes labelRes: Int = 0) {
         if (stack.last().screen == screen) return
-        stack.add(Crumb(screen, label))
+        stack.add(Crumb(screen, label, labelRes))
     }
 
     /** The one way back to a clean slate: resets the whole trail to just Home. */
     fun home() {
         stack.clear()
-        stack.add(Crumb(CarScreen.Home, "Home"))
+        stack.add(Crumb(CarScreen.Home, "Home", R.string.crumb_home))
     }
 
     /**
@@ -90,8 +99,9 @@ class CarNavigator(startId: String) {
         private set
 
     /**
-     * The pill's dock button: moves the player beside the map, going Home first if need be. With
-     * lyrics already there it swaps them for the controls; with the controls there it closes.
+     * The pill's dock button, an open/close switch for the panel: moves the player beside the map,
+     * going Home first if need be, or closes the panel when something is already there. Switching
+     * between the player and lyrics is done inside the panel itself.
      */
     fun togglePlayerDock() {
         if (current != CarScreen.Home) {
@@ -99,9 +109,11 @@ class CarNavigator(startId: String) {
             home()
             return
         }
-        sidePanel = if (sidePanel == SidePanel.CONTROLS) SidePanel.NONE else SidePanel.CONTROLS
+        sidePanel = if (sidePanel == SidePanel.NONE) SidePanel.CONTROLS else SidePanel.NONE
     }
 
+    fun showSidePlayer() { sidePanel = SidePanel.CONTROLS }
+
     fun showSideLyrics() { sidePanel = SidePanel.LYRICS }
 
     fun closeSidePanel() { sidePanel = SidePanel.NONE }
@@ -114,17 +126,17 @@ class CarNavigator(startId: String) {
 
     fun dismissAppMenu() { appMenu = null }
 
-    fun media() { push(CarScreen.Media, "Media") }
+    fun media() { push(CarScreen.Media, "Media", R.string.crumb_media) }
 
     fun browse(label: String) { push(CarScreen.Browse, label) }
 
-    fun apps() { push(CarScreen.Apps, "Apps") }
+    fun apps() { push(CarScreen.Apps, "Apps", R.string.crumb_apps) }
 
-    fun settings() { push(CarScreen.Settings, "Settings") }
+    fun settings() { push(CarScreen.Settings, "Settings", R.string.settings_title) }
 
-    fun dashboard() { push(CarScreen.Dashboard, "Dashboard") }
+    fun dashboard() { push(CarScreen.Dashboard, "Dashboard", R.string.crumb_dashboard) }
 
-    fun weather() { push(CarScreen.Weather, "Weather") }
+    fun weather() { push(CarScreen.Weather, "Weather", R.string.crumb_weather) }
 
     fun vehicleData() { push(CarScreen.VehicleData, "Vehicle data") }
 
@@ -132,10 +144,10 @@ class CarNavigator(startId: String) {
 
     /** The list lives on the dashboard; only a reply gets a screen of its own. */
     fun notifications(replyTo: String? = null) {
-        if (replyTo == null) dashboard() else push(CarScreen.Notifications(replyTo), "Reply")
+        if (replyTo == null) dashboard() else push(CarScreen.Notifications(replyTo), "Reply", R.string.crumb_reply)
     }
 
-    fun open(id: String) { push(CarScreen.App(id), CarApps.find(id)?.label ?: id) }
+    fun open(id: String) { push(CarScreen.App(id), CarApps.find(id)?.label ?: id, CarApps.find(id)?.labelRes ?: 0) }
 
     /** Jumps straight to a step already on the trail, dropping everything after it - what
      * tapping a breadcrumb does. Index 0 (Home) is always on the trail, so this always succeeds. */

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarSensors.kt

@@ -5,16 +5,7 @@ import app.seb3thehacker.gearslip.Wire
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 
-/**
- * Everything the head unit's sensor channel has offered and sent, for the "Vehicle data" screen.
- *
- * [ServiceDiscovery.findSensorService] tells us which numeric sensor types this head unit is
- * willing to stream; [SensorType] names the ones publicly documented by other AA reverse-engineering
- * projects (aasdk, openauto). That mapping is carried over from other projects, not verified
- * against this exact unit, so it's a label, not a guarantee - the raw field dump next to it is
- * the ground truth. Once [onEvent] starts decoding real traffic from the 2018 Uconnect, correct
- * any type that turns out to be mislabeled.
- */
+/** Raw sensor readings, keyed by SensorBatch field number, which matches the sensor type id. */
 object CarSensors {
 
     data class Reading(val typeId: Int, val typeName: String, val raw: String, val updatedAtMs: Long)
@@ -30,16 +21,10 @@ object CarSensors {
         }
     }
 
-    /**
-     * One SensorEventIndication. Every reverse-engineered version of this message multiplexes
-     * every sensor type into one shared set of message-level field numbers (field N = "the data
-     * for sensor type N", roughly) rather than tagging events with the type id from
-     * SensorType.type - so field number is read here as a best-effort type id, same as the
-     * other services in this file.
-     */
+    /** Each SensorBatch field contains repeated readings of one sensor type. */
     fun onEvent(body: ByteArray) {
         val now = System.currentTimeMillis()
-        val fields = Wire.fields(body)
+        val fields = Wire.fields(body).filter { it.wireType == 2 }
         val byType = fields.groupBy { it.number }
         val updated = byType.mapValues { (number, group) ->
             Reading(
@@ -61,10 +46,7 @@ object CarSensors {
     }
 }
 
-/**
- * Sensor type ids as named across public Android Auto reverse-engineering references. Treated as
- * a label, not a fact - see [CarSensors] doc.
- */
+/** Sensor type values shared by the discovery service and SensorBatch. */
 object SensorType {
     private val NAMES = mapOf(
         1 to "Location (GPS)",
@@ -89,6 +71,10 @@ object SensorType {
         20 to "Gyroscope",
         21 to "GPS satellites",
         22 to "Toll card",
+        23 to "Vehicle energy model",
+        24 to "Trailer",
+        25 to "Raw vehicle energy model",
+        26 to "Raw EV trip settings",
     )
 
     fun name(id: Int): String = NAMES[id]?.let { "$it (#$id)" } ?: "Sensor #$id"

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarServices.kt

@@ -2,6 +2,7 @@ package app.seb3thehacker.gearslip.car
 
 import android.content.ComponentName
 import android.content.Context
+import android.media.session.MediaController
 import android.media.session.MediaSessionManager
 import android.media.session.PlaybackState
 import app.seb3thehacker.gearslip.audio.CarAudio
@@ -60,6 +61,13 @@ object CarServices {
     private var navStopped = false
     private var autoplayPending = false
 
+    /**
+     * The app that was playing when the driver opened another one. Opening an app is only a look
+     * at its library: until something plays there, the music carries on in this one, so leaving
+     * the new app's screen goes back to it, as Android Auto does.
+     */
+    private var stillPlaying: MediaApp? = null
+
     fun init(appContext: Context) {
         context = appContext.applicationContext
         app.seb3thehacker.gearslip.notify.CarMotion.start(appContext)
@@ -130,6 +138,8 @@ object CarServices {
         val live = phase == CarMedia.Phase.READY || phase == CarMedia.Phase.CONNECTING
         if (_mediaApp.value?.component == app.component && live) return
 
+        val previous = _mediaApp.value
+        stillPlaying = previous?.takeIf { it.component != app.component && media.now.value.playing && !autoplay }
         _mediaApp.value = app
         autoplayPending = autoplay
         media.connect(app)
@@ -151,12 +161,26 @@ object CarServices {
         return true
     }
 
+    /**
+     * The media screen closed. If nothing started in the app it showed, go back to the one that
+     * kept playing meanwhile, so the player and its buttons follow the music you can hear.
+     */
+    fun mediaScreenClosed() {
+        val back = stillPlaying ?: return
+        stillPlaying = null
+        // A track loaded here, even one paused since, means the driver used this app.
+        if (media.now.value.playing || media.now.value.title.isNotEmpty()) return
+        app.seb3thehacker.gearslip.GearslipLog.i("media: nothing played in ${_mediaApp.value?.label}, back to ${back.label}")
+        openMedia(back)
+    }
+
     /** Closes the media app from the car: stops what it's playing and drops the connection. */
     fun closeMedia() {
         if (media.now.value.playing) media.togglePlay()
         media.disconnect()
         _mediaApp.value = null
         autoplayPending = false
+        stillPlaying = null
     }
 
     /** Called once the media app is connected: starts playback if that was asked for. */
@@ -178,7 +202,7 @@ object CarServices {
             _hasNavApps.value = navApps.isNotEmpty()
             // Never auto-pick one already known to fail outright - a driver who plugs in should
             // land on a map, not on the one tile marked with a red X.
-            val candidates = navApps.filterNot { KnownApps.isBroken(it.component.packageName) }
+            val candidates = navApps.filterNot { KnownApps.isBroken(ctx, it.component.packageName) }
             val last = CarSettings.lastNav.value
             // The one used last, or - first run, nothing on record yet - whichever comes first:
             // a driver who plugs in for the first time shouldn't have to go pick one by hand
@@ -231,7 +255,41 @@ object CarServices {
      * just the one Gearslip opened: anything the car was playing was going through the car.
      */
     fun pausePhoneMedia(why: String = "the car left") {
-        val ctx = context ?: return
+        pausedForNow = null
+        pausedOwnForNow = false
+        pause(why)
+    }
+
+    /** What [pausePhoneMediaForNow] paused, for [resumePhoneMedia] to play again. */
+    @Volatile private var pausedForNow: List<MediaController>? = null
+    /** Without notification access, whether it paused the app Gearslip drives itself. */
+    @Volatile private var pausedOwnForNow = false
+
+    /** The car wants the speakers for a moment: pause, and remember what to play after. */
+    fun pausePhoneMediaForNow() {
+        pausedOwnForNow = false
+        pausedForNow = pause("the car needs the speakers for a moment")
+    }
+
+    /** The car handed the speakers back: play what it paused, unless the driver has since. */
+    fun resumePhoneMedia() {
+        val paused = pausedForNow ?: return
+        pausedForNow = null
+        if (pausedOwnForNow) {
+            pausedOwnForNow = false
+            mediaOrNull()?.let { if (!it.now.value.playing) it.togglePlay() }
+            return
+        }
+        val waiting = paused.filter { it.playbackState?.state == PlaybackState.STATE_PAUSED }
+        waiting.forEach { runCatching { it.transportControls.play() } }
+        if (waiting.isNotEmpty()) {
+            app.seb3thehacker.gearslip.GearslipLog.i("media: playing ${waiting.joinToString { it.packageName }} again: the car gave the speakers back")
+        }
+    }
+
+    /** What it paused. Without notification access it can only reach the app Gearslip drives itself. */
+    private fun pause(why: String): List<MediaController> {
+        val ctx = context ?: return emptyList()
         val manager = ctx.getSystemService(MediaSessionManager::class.java)
         val listener = ComponentName(ctx, GearslipNotificationListener::class.java)
         val playing = try {
@@ -241,13 +299,19 @@ object CarServices {
         }
         if (playing == null) {
             // No notification access: the app Gearslip itself is driving is all it can reach.
-            mediaOrNull()?.let { if (it.now.value.playing) it.togglePlay() }
-            return
+            mediaOrNull()?.let {
+                if (it.now.value.playing) {
+                    it.togglePlay()
+                    pausedOwnForNow = true
+                }
+            }
+            return emptyList()
         }
         playing.forEach { runCatching { it.transportControls.pause() } }
         if (playing.isNotEmpty()) {
             app.seb3thehacker.gearslip.GearslipLog.i("media: paused ${playing.joinToString { it.packageName }}: $why")
         }
+        return playing
     }
 
     /** The car went away: nothing should keep running for a screen that no longer exists. */

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarSettings.kt

@@ -1,5 +1,6 @@
 package app.seb3thehacker.gearslip.car
 
+import app.seb3thehacker.gearslip.car.theme.DarkStyle
 import android.content.Context
 import app.seb3thehacker.gearslip.AppSettings
 import app.seb3thehacker.gearslip.audio.CarAudio
@@ -18,6 +19,33 @@ enum class Units { AUTO, IMPERIAL, METRIC }
 /** The car UI's own colours. Separate from [NightMode], which is about the light outside (the map). */
 enum class AppTheme { PHONE, LIGHT, DARK }
 
+/** A screen's width and height in pixels, as someone typed it: "1280x480". */
+data class ScreenSize(val width: Int, val height: Int) {
+    override fun toString() = "${width}x$height"
+
+    companion object {
+        fun parse(text: String?): ScreenSize? {
+            val parts = text?.lowercase()?.split('x', '×', ' ')?.filter { it.isNotBlank() } ?: return null
+            if (parts.size != 2) return null
+            val w = parts[0].trim().toIntOrNull() ?: return null
+            val h = parts[1].trim().toIntOrNull() ?: return null
+            return if (w in 100..8000 && h in 100..8000) ScreenSize(w, h) else null
+        }
+    }
+}
+
+/**
+ * How a head unit puts our frame on a screen of another shape. [CROP] cuts the edges off, as
+ * a car's own margins do; [SQUASH] shrinks the whole frame to fit, stretching everything.
+ */
+enum class ScreenFit { CROP, SQUASH }
+
+/** What size the phone's car preview draws: the last car's, this device's whole screen, or one typed in. */
+enum class PreviewSize { LAST_CAR, FILL, CUSTOM }
+
+/** When the nav bar gets out of the way: never, during a route, or whenever the map is up. */
+enum class NavBarMode { SHOW, HIDE_NAVIGATING, HIDE }
+
 /**
  * Settings changed from the car screen itself. Held as flows so the car UI reacts the moment a
  * button is tapped, and persisted through [AppSettings] so they survive the next connection.
@@ -25,10 +53,12 @@ enum class AppTheme { PHONE, LIGHT, DARK }
 object CarSettings {
 
     private const val KEY_SCALE = "car_scale"
+    private const val KEY_DENSITY = "car_density"
     private const val KEY_OPEN = "car_open_on_connect"
     private const val KEY_NIGHT = "car_night_mode"
     private const val KEY_PIPE_AUDIO = "car_pipe_audio"
 private const val KEY_SPEAK_DIRECTIONS = "car_speak_directions"
+private const val KEY_DIRECTIONS_OVER_MUSIC = "car_directions_over_music"
 private const val KEY_BLUETOOTH_WARNING = "car_bluetooth_warning"
 private const val KEY_LOCATION_WARNING = "car_location_warning"
     private const val KEY_AUDIO_CHOICE_ASKED = "car_audio_choice_asked"
@@ -36,15 +66,27 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     private const val KEY_LAST_MEDIA = "car_last_media"
     private const val KEY_AUTOPLAY = "car_autoplay"
     private const val KEY_PLAYER_TITLE = "car_player_title"
+    private const val KEY_PLAYER_LEFT = "car_player_left"
+    private const val KEY_MORE_LYRICS = "car_more_lyrics"
     private const val KEY_THEME = "car_app_theme"
     private const val KEY_UI_THEME = "car_ui_theme"
+    private const val KEY_DARK_STYLE = "car_dark_style"
     private const val KEY_PINNED = "car_pinned_apps"
     private const val KEY_APP_ORDER = "car_app_order"
+    private const val KEY_HIDDEN_APPS = "car_hidden_apps"
     private const val KEY_EXPERIMENTAL_FEATURES = "car_experimental_features"
     private const val KEY_SYSTEM_SPEECH = "car_system_speech"
     private const val KEY_CAR_SENSORS = "car_sensors_enabled"
+    private const val KEY_ADAPTIVE_VIDEO = "adaptive_video_enabled"
+private const val KEY_CLUSTER_VIDEO = "cluster_video_enabled"
+    private const val KEY_DEBUG_BADGE = "debug_badge"
     private const val KEY_SEEN_SAFETY_WARNING = "car_seen_safety_warning"
     private const val KEY_UNITS = "car_units"
+    private const val KEY_NAV_BAR = "car_nav_bar"
+    private const val KEY_SCREEN_SIZE = "car_screen_size"
+    private const val KEY_SCREEN_FIT = "car_screen_fit"
+    private const val KEY_PREVIEW_SIZE = "preview_size"
+    private const val KEY_PREVIEW_CUSTOM = "preview_custom_size"
     private const val KEY_WHATS_NEW = "car_whats_new_after_updates"
     private const val KEY_WHATS_NEW_SEEN = "car_whats_new_seen_code"
 
@@ -58,32 +100,81 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     private lateinit var app: Context
 
     private val scaleFlow = MutableStateFlow(1f)
+    private val carDensityFlow = MutableStateFlow(DENSITY_FROM_CAR)
     private val openFlow = MutableStateFlow(HOME)
     private val nightFlow = MutableStateFlow(NightMode.AUTO)
     private val pipeAudioFlow = MutableStateFlow(true)
     private val speakDirectionsFlow = MutableStateFlow(true)
+    private val directionsOverMusicFlow = MutableStateFlow(false)
     private val bluetoothWarningFlow = MutableStateFlow(true)
     private val locationWarningFlow = MutableStateFlow(true)
     private val lastNavFlow = MutableStateFlow<String?>(null)
     private val lastMediaFlow = MutableStateFlow<String?>(null)
     private val autoplayFlow = MutableStateFlow(false)
     private val playerTitleFlow = MutableStateFlow(false)
+    private val playerLeftFlow = MutableStateFlow(false)
+    private val moreLyricsFlow = MutableStateFlow(true)
     private val themeFlow = MutableStateFlow(AppTheme.PHONE)
     val appTheme: StateFlow<AppTheme> = themeFlow
+    private val darkStyleFlow = MutableStateFlow(DarkStyle.BLACK)
+
+    /** How dark the car's dark mode goes; black until the driver picks another. */
+    val darkStyle: StateFlow<DarkStyle> = darkStyleFlow
     private val uiThemeFlow = MutableStateFlow(GsThemes.default.id)
 
     /** Id of the [GsTheme] controls are drawn in; an unknown id falls back to the default. */
     val uiTheme: StateFlow<String> = uiThemeFlow
     private val pinnedFlow = MutableStateFlow<Set<String>>(emptySet())
     private val appOrderFlow = MutableStateFlow<List<String>>(emptyList())
+    private val hiddenAppsFlow = MutableStateFlow<Set<String>>(emptySet())
     private val experimentalFeaturesFlow = MutableStateFlow(false)
     private val systemSpeechFlow = MutableStateFlow(false)
     private val carSensorsFlow = MutableStateFlow(false)
+    private val adaptiveVideoFlow = MutableStateFlow(false)
+    private val clusterVideoFlow = MutableStateFlow(false)
+    private val debugBadgeFlow = MutableStateFlow(true)
     private val seenSafetyWarningFlow = MutableStateFlow(false)
     private val unitsFlow = MutableStateFlow(Units.AUTO)
 
     val units: StateFlow<Units> = unitsFlow
 
+    private val screenSizeFlow = MutableStateFlow<ScreenSize?>(null)
+    private val screenFitFlow = MutableStateFlow(ScreenFit.CROP)
+    private val previewSizeFlow = MutableStateFlow(PreviewSize.LAST_CAR)
+    private val previewCustomFlow = MutableStateFlow<ScreenSize?>(null)
+
+    /** The car screen's real size, when the head unit gets it wrong; null trusts the head unit. */
+    val screenSize: StateFlow<ScreenSize?> = screenSizeFlow
+    val screenFit: StateFlow<ScreenFit> = screenFitFlow
+    val previewSize: StateFlow<PreviewSize> = previewSizeFlow
+    val previewCustom: StateFlow<ScreenSize?> = previewCustomFlow
+
+    /** Takes effect the next time the car connects: the video size is agreed at the start. */
+    fun setScreenSize(size: ScreenSize?) {
+        screenSizeFlow.value = size
+        AppSettings.putString(app, KEY_SCREEN_SIZE, size?.toString().orEmpty())
+    }
+
+    fun setScreenFit(fit: ScreenFit) {
+        screenFitFlow.value = fit
+        AppSettings.putString(app, KEY_SCREEN_FIT, fit.name)
+    }
+
+    fun setPreviewSize(size: PreviewSize, custom: ScreenSize? = previewCustomFlow.value) {
+        previewSizeFlow.value = size
+        previewCustomFlow.value = custom
+        AppSettings.putString(app, KEY_PREVIEW_SIZE, size.name)
+        AppSettings.putString(app, KEY_PREVIEW_CUSTOM, custom?.toString().orEmpty())
+    }
+
+    private val navBarFlow = MutableStateFlow(NavBarMode.SHOW)
+    val navBarMode: StateFlow<NavBarMode> = navBarFlow
+
+    fun setNavBarMode(mode: NavBarMode) {
+        navBarFlow.value = mode
+        AppSettings.putString(app, KEY_NAV_BAR, mode.name)
+    }
+
 
     private val whatsNewFlow = MutableStateFlow(true)
     private val whatsNewSeenFlow = MutableStateFlow(0)
@@ -133,6 +224,9 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     /** The launcher's order once the driver has moved a tile; empty keeps the grouped default. */
     val appOrder: StateFlow<List<String>> = appOrderFlow
 
+    /** The tiles left out of the car's app drawer, by [Entry.componentId]. */
+    val hiddenApps: StateFlow<Set<String>> = hiddenAppsFlow
+
     /** Flattened component names of the map and media apps used last, brought back on connect. */
     val lastNav: StateFlow<String?> = lastNavFlow
     val lastMedia: StateFlow<String?> = lastMediaFlow
@@ -146,7 +240,23 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
      */
     val playerTitle: StateFlow<Boolean> = playerTitleFlow
 
+    /** The home screen's player sits left of the map instead of right of it. */
+    val playerLeft: StateFlow<Boolean> = playerLeftFlow
+
+    /** Lyrics from BetterLyrics and KuGou as well as LRCLIB; off sends song details to LRCLIB only. */
+    val moreLyrics: StateFlow<Boolean> = moreLyricsFlow
+
     val scale: StateFlow<Float> = scaleFlow
+
+    /** [carDensity] when it leaves the choice to the car. */
+    const val DENSITY_FROM_CAR = 0
+    val DENSITIES = listOf(160, 180, 200, 220, 240)
+
+    /** An absolute DPI for the car UI and its apps; the video's resolution doesn't change with it. */
+    val carDensity: StateFlow<Int> = carDensityFlow
+
+    /** The density to draw at, for a car or preview that would otherwise use [carDpi]. */
+    fun effectiveDensity(carDpi: Int) = carDensityFlow.value.takeIf { it != DENSITY_FROM_CAR } ?: carDpi
     val openOnConnect: StateFlow<String> = openFlow
     val nightMode: StateFlow<NightMode> = nightFlow
 
@@ -162,6 +272,9 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     /** Gearslip reads the map app's turns aloud on the car's directions channel; see DirectionsVoice. */
     val speakDirections: StateFlow<Boolean> = speakDirectionsFlow
 
+    /** The turns go out on the music channel instead, for cars the directions channel upsets. */
+    val directionsOverMusic: StateFlow<Boolean> = directionsOverMusicFlow
+
     /** With Bluetooth audio, warn when the phone isn't connected to the car; see BluetoothAudioCheck. */
     val bluetoothWarning: StateFlow<Boolean> = bluetoothWarningFlow
 
@@ -198,6 +311,27 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
      */
     val carSensorsEnabled: StateFlow<Boolean> = carSensorsFlow
 
+    /**
+     * Video bitrate that backs off when the car, or the Wi-Fi to it, falls behind. Takes effect
+     * only while [experimentalFeaturesEnabled] is on too; untested in a car so far.
+     */
+    val adaptiveVideoEnabled: StateFlow<Boolean> = adaptiveVideoFlow
+
+    /**
+     * Gearslip's turn card on a car's instrument-cluster screen, for a car that offers one as a
+     * second video sink. Applies only while [experimentalFeaturesEnabled] is on too, and from the
+     * next connection; untested in a car so far.
+     */
+    val clusterVideoEnabled: StateFlow<Boolean> = clusterVideoFlow
+
+    /** Debug builds only: the car screen's DEBUG BUILD badge, which screenshots for the README leave out. */
+    val debugBadge: StateFlow<Boolean> = debugBadgeFlow
+
+    fun setDebugBadge(on: Boolean) {
+        debugBadgeFlow.value = on
+        AppSettings.putString(app, KEY_DEBUG_BADGE, on.toString())
+    }
+
     /**
      * Whether the car screen's own "drive safely" warning has already been shown and dismissed
      * once, from this same install. Separate from the phone side's own compat/safety dialogs -
@@ -214,19 +348,26 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     fun init(context: Context) {
         app = context.applicationContext
         scaleFlow.value = AppSettings.getString(app, KEY_SCALE, "1.0").toFloatOrNull() ?: 1f
+        carDensityFlow.value = AppSettings.getString(app, KEY_DENSITY, "").toIntOrNull()?.takeIf { it in DENSITIES } ?: DENSITY_FROM_CAR
         openFlow.value = AppSettings.getString(app, KEY_OPEN, HOME)
         lastNavFlow.value = AppSettings.getString(app, KEY_LAST_NAV, "").ifEmpty { null }
         lastMediaFlow.value = AppSettings.getString(app, KEY_LAST_MEDIA, "").ifEmpty { null }
         themeFlow.value = runCatching {
             AppTheme.valueOf(AppSettings.getString(app, KEY_THEME, AppTheme.PHONE.name))
         }.getOrDefault(AppTheme.PHONE)
+        darkStyleFlow.value = runCatching {
+            DarkStyle.valueOf(AppSettings.getString(app, KEY_DARK_STYLE, DarkStyle.BLACK.name))
+        }.getOrDefault(DarkStyle.BLACK)
         uiThemeFlow.value = AppSettings.getString(app, KEY_UI_THEME, GsThemes.default.id)
         autoplayFlow.value = AppSettings.getString(app, KEY_AUTOPLAY, "false") == "true"
         playerTitleFlow.value = AppSettings.getString(app, KEY_PLAYER_TITLE, "false") == "true"
+        playerLeftFlow.value = AppSettings.getString(app, KEY_PLAYER_LEFT, "false") == "true"
+        moreLyricsFlow.value = AppSettings.getString(app, KEY_MORE_LYRICS, "true") == "true"
         pipeAudioFlow.value = AppSettings.getString(app, KEY_PIPE_AUDIO, "true") == "true"
         // Until the driver sets it, on for USB audio and off for Bluetooth, where the map app's
         // own voice already reaches the car.
         speakDirectionsFlow.value = AppSettings.getString(app, KEY_SPEAK_DIRECTIONS, pipeAudioFlow.value.toString()) == "true"
+        directionsOverMusicFlow.value = AppSettings.getString(app, KEY_DIRECTIONS_OVER_MUSIC, "false") == "true"
         bluetoothWarningFlow.value = AppSettings.getString(app, KEY_BLUETOOTH_WARNING, "true") == "true"
         locationWarningFlow.value = AppSettings.getString(app, KEY_LOCATION_WARNING, "true") == "true"
         nightFlow.value = runCatching {
@@ -236,13 +377,29 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
             .split(",").filter { it.isNotEmpty() }.toSet()
         appOrderFlow.value = AppSettings.getString(app, KEY_APP_ORDER, "")
             .split(",").filter { it.isNotEmpty() }
+        hiddenAppsFlow.value = AppSettings.getString(app, KEY_HIDDEN_APPS, "")
+            .split(",").filter { it.isNotEmpty() }.toSet()
         experimentalFeaturesFlow.value = AppSettings.getString(app, KEY_EXPERIMENTAL_FEATURES, "false") == "true"
         systemSpeechFlow.value = AppSettings.getString(app, KEY_SYSTEM_SPEECH, "false") == "true"
         carSensorsFlow.value = AppSettings.getString(app, KEY_CAR_SENSORS, "false") == "true"
+        adaptiveVideoFlow.value = AppSettings.getString(app, KEY_ADAPTIVE_VIDEO, "false") == "true"
+        clusterVideoFlow.value = AppSettings.getString(app, KEY_CLUSTER_VIDEO, "false") == "true"
+        debugBadgeFlow.value = AppSettings.getString(app, KEY_DEBUG_BADGE, "true") == "true"
         seenSafetyWarningFlow.value = AppSettings.getString(app, KEY_SEEN_SAFETY_WARNING, "false") == "true"
         unitsFlow.value = runCatching {
             Units.valueOf(AppSettings.getString(app, KEY_UNITS, Units.AUTO.name))
         }.getOrDefault(Units.AUTO)
+        screenSizeFlow.value = ScreenSize.parse(AppSettings.getString(app, KEY_SCREEN_SIZE, ""))
+        screenFitFlow.value = runCatching {
+            ScreenFit.valueOf(AppSettings.getString(app, KEY_SCREEN_FIT, ScreenFit.CROP.name))
+        }.getOrDefault(ScreenFit.CROP)
+        previewSizeFlow.value = runCatching {
+            PreviewSize.valueOf(AppSettings.getString(app, KEY_PREVIEW_SIZE, PreviewSize.LAST_CAR.name))
+        }.getOrDefault(PreviewSize.LAST_CAR)
+        previewCustomFlow.value = ScreenSize.parse(AppSettings.getString(app, KEY_PREVIEW_CUSTOM, ""))
+        navBarFlow.value = runCatching {
+            NavBarMode.valueOf(AppSettings.getString(app, KEY_NAV_BAR, NavBarMode.SHOW.name))
+        }.getOrDefault(NavBarMode.SHOW)
         whatsNewFlow.value = AppSettings.getString(app, KEY_WHATS_NEW, "true") == "true"
         whatsNewSeenFlow.value = AppSettings.getString(app, KEY_WHATS_NEW_SEEN, "0").toIntOrNull() ?: 0
     }
@@ -252,6 +409,11 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         AppSettings.putString(app, KEY_SCALE, value.toString())
     }
 
+    fun setCarDensity(dpi: Int) {
+        carDensityFlow.value = dpi
+        AppSettings.putString(app, KEY_DENSITY, dpi.toString())
+    }
+
     fun setOpenOnConnect(id: String) {
         openFlow.value = id
         AppSettings.putString(app, KEY_OPEN, id)
@@ -272,6 +434,11 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         AppSettings.putString(app, KEY_THEME, theme.name)
     }
 
+    fun setDarkStyle(style: DarkStyle) {
+        darkStyleFlow.value = style
+        AppSettings.putString(app, KEY_DARK_STYLE, style.name)
+    }
+
     fun setUiTheme(id: String) {
         uiThemeFlow.value = id
         AppSettings.putString(app, KEY_UI_THEME, id)
@@ -282,6 +449,16 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         AppSettings.putString(app, KEY_PLAYER_TITLE, on.toString())
     }
 
+    fun setPlayerLeft(on: Boolean) {
+        playerLeftFlow.value = on
+        AppSettings.putString(app, KEY_PLAYER_LEFT, on.toString())
+    }
+
+    fun setMoreLyrics(on: Boolean) {
+        moreLyricsFlow.value = on
+        AppSettings.putString(app, KEY_MORE_LYRICS, on.toString())
+    }
+
     fun setAutoplay(on: Boolean) {
         autoplayFlow.value = on
         AppSettings.putString(app, KEY_AUTOPLAY, on.toString())
@@ -305,6 +482,11 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         AppSettings.putString(app, KEY_SPEAK_DIRECTIONS, on.toString())
     }
 
+    fun setDirectionsOverMusic(on: Boolean) {
+        directionsOverMusicFlow.value = on
+        AppSettings.putString(app, KEY_DIRECTIONS_OVER_MUSIC, on.toString())
+    }
+
     fun setBluetoothWarning(on: Boolean) {
         bluetoothWarningFlow.value = on
         AppSettings.putString(app, KEY_BLUETOOTH_WARNING, on.toString())
@@ -325,6 +507,16 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         AppSettings.putString(app, KEY_SYSTEM_SPEECH, on.toString())
     }
 
+    fun setAdaptiveVideoEnabled(on: Boolean) {
+        adaptiveVideoFlow.value = on
+        AppSettings.putString(app, KEY_ADAPTIVE_VIDEO, on.toString())
+    }
+
+    fun setClusterVideoEnabled(on: Boolean) {
+        clusterVideoFlow.value = on
+        AppSettings.putString(app, KEY_CLUSTER_VIDEO, on.toString())
+    }
+
     fun setCarSensorsEnabled(on: Boolean) {
         carSensorsFlow.value = on
         AppSettings.putString(app, KEY_CAR_SENSORS, on.toString())
@@ -349,6 +541,12 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         AppSettings.putString(app, KEY_PINNED, next.joinToString(","))
     }
 
+    fun setAppHidden(id: String, hide: Boolean) {
+        val next = if (hide) hiddenAppsFlow.value + id else hiddenAppsFlow.value - id
+        hiddenAppsFlow.value = next
+        AppSettings.putString(app, KEY_HIDDEN_APPS, next.joinToString(","))
+    }
+
     fun setAppOrder(ids: List<String>) {
         appOrderFlow.value = ids
         AppSettings.putString(app, KEY_APP_ORDER, ids.joinToString(","))

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarSettingsScreen.kt

@@ -1,16 +1,25 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 
+import app.seb3thehacker.gearslip.car.theme.DarkStyle
 import app.seb3thehacker.gearslip.car.theme.*
 import android.os.Build
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.ui.graphics.Color
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
@@ -49,19 +58,29 @@ import kotlinx.coroutines.withContext
 fun CarSettingsScreen() {
     val scale by CarSettings.scale.collectAsState()
     val open by CarSettings.openOnConnect.collectAsState()
+    val launcher by LauncherMode.active.collectAsState()
     val night by CarSettings.nightMode.collectAsState()
     val units by CarSettings.units.collectAsState()
+    val navBar by CarSettings.navBarMode.collectAsState()
+    val screenSize by CarSettings.screenSize.collectAsState()
+    val screenFit by CarSettings.screenFit.collectAsState()
     val whatsNew by CarSettings.whatsNewAfterUpdates.collectAsState()
     val pipeAudio by CarSettings.pipeAudio.collectAsState()
     val speakDirections by CarSettings.speakDirections.collectAsState()
+    val directionsOverMusic by CarSettings.directionsOverMusic.collectAsState()
     val bluetoothWarning by CarSettings.bluetoothWarning.collectAsState()
     val locationWarning by CarSettings.locationWarning.collectAsState()
     val autoplay by CarSettings.autoplay.collectAsState()
     val playerTitle by CarSettings.playerTitle.collectAsState()
+    val playerLeft by CarSettings.playerLeft.collectAsState()
+    val moreLyrics by CarSettings.moreLyrics.collectAsState()
     val theme by CarSettings.appTheme.collectAsState()
     val uiTheme by CarSettings.uiTheme.collectAsState()
+    val darkStyle by CarSettings.darkStyle.collectAsState()
     val experimentalFeatures by CarSettings.experimentalFeaturesEnabled.collectAsState()
     val carSensors by CarSettings.carSensorsEnabled.collectAsState()
+    val adaptiveVideo by CarSettings.adaptiveVideoEnabled.collectAsState()
+    val clusterVideo by CarSettings.clusterVideoEnabled.collectAsState()
     val systemSpeech by CarSettings.systemSpeech.collectAsState()
     val display by CarEnvironment.display.collectAsState()
     val vehicle by CarEnvironment.vehicle.collectAsState()
@@ -70,140 +89,276 @@ fun CarSettingsScreen() {
         value = withContext(Dispatchers.Default) { CertSummary.read(context) }
     }
 
-    Column(
-        Modifier
-            .fillMaxSize()
-            .verticalScroll(rememberScrollState())
-            .padding(horizontal = 24.dp, vertical = 16.dp),
-        verticalArrangement = Arrangement.spacedBy(20.dp),
-    ) {
-        ScreenHeader("Settings")
+    // A rail of the groups down the left, and the chosen group's settings beside it: five short
+    // lists instead of one long scroll.
+    var chosen by androidx.compose.runtime.saveable.rememberSaveable { androidx.compose.runtime.mutableIntStateOf(0) }
+    val listState = androidx.compose.foundation.lazy.rememberLazyListState()
+    androidx.compose.runtime.LaunchedEffect(chosen) { listState.scrollToItem(0) }
+    Row(Modifier.fillMaxSize().padding(start = 16.dp, top = 12.dp)) {
+    SettingsRail(listOf(stringResource(R.string.car_group_screen), stringResource(R.string.car_group_nav_bar), stringResource(R.string.car_group_sound), stringResource(R.string.car_group_warnings), stringResource(R.string.car_group_more)), chosen) { chosen = it }
+        LazyColumn(
+            Modifier.weight(1f).fillMaxHeight(),
+            state = listState,
+            // Built as it scrolls into view rather than all at once: every row here is a set of
+            // buttons, and building the whole screen made opening Settings visibly slow.
+            contentPadding = PaddingValues(horizontal = 24.dp, vertical = 16.dp),
+            verticalArrangement = Arrangement.spacedBy(20.dp),
+        ) {
+            var section: Int
+            section = 0
+            if (section == chosen) item { Group(stringResource(R.string.car_group_screen)) }
 
-        ChoiceRow(
-            "Open on connect",
-            listOf(CarSettings.HOME to "Home") + CarApps.all.filter { it.id != "settings" }.map { it.id to it.label },
-            open,
-        ) { CarSettings.setOpenOnConnect(it) }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_open_on_connect),
+                    listOf(CarSettings.HOME to stringResource(R.string.choice_open_home)) + CarApps.shown(launcher, LauncherMode.canCall(context)).map { it.id to stringResource(it.labelRes) },
+                    open,
+                ) { CarSettings.setOpenOnConnect(it) }
+            }
 
-        ChoiceRow(
-            "Size",
-            listOf(1f to "Normal", 1.25f to "Large", 1.5f to "Extra large"),
-            scale,
-        ) { CarSettings.setScale(it) }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_size),
+                    listOf(1f to stringResource(R.string.choice_size_normal), 1.25f to stringResource(R.string.choice_size_large), 1.5f to stringResource(R.string.choice_size_xlarge)),
+                    scale,
+                ) { CarSettings.setScale(it) }
+            }
 
-        ChoiceRow(
-            "App theme",
-            listOf(AppTheme.PHONE to "Follow phone", AppTheme.LIGHT to "Light", AppTheme.DARK to "Dark"),
-            theme,
-        ) { CarSettings.setAppTheme(it) }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_app_theme),
+                    listOf(AppTheme.PHONE to stringResource(R.string.choice_theme_phone), AppTheme.LIGHT to stringResource(R.string.choice_theme_light), AppTheme.DARK to stringResource(R.string.choice_theme_dark)),
+                    theme,
+                ) { CarSettings.setAppTheme(it) }
+            }
 
-        ChoiceRow(
-            "Theme",
-            GsThemes.builtIn.map { it.id to it.name },
-            uiTheme,
-        ) { CarSettings.setUiTheme(it) }
+            if (section == chosen && theme != AppTheme.LIGHT) item {
+                ChoiceRow(
+                    stringResource(R.string.car_dark_mode),
+                    listOf(
+                        DarkStyle.BLACK to stringResource(R.string.choice_dark_black),
+                        DarkStyle.BLACK_COLOUR to stringResource(R.string.choice_dark_black_colour),
+                        DarkStyle.DEEP_COLOUR to stringResource(R.string.choice_dark_deep_colour),
+                        DarkStyle.GREY to stringResource(R.string.choice_dark_grey),
+                    ),
+                    darkStyle,
+                ) { CarSettings.setDarkStyle(it) }
+            }
 
-        ChoiceRow(
-            "Map day/night",
-            listOf(NightMode.AUTO to "Auto", NightMode.DAY to "Day", NightMode.NIGHT to "Night"),
-            night,
-        ) { CarSettings.setNightMode(it) }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.carset_theme),
+                    GsThemes.builtIn.map { it.id to it.name },
+                    uiTheme,
+                ) { CarSettings.setUiTheme(it) }
+            }
 
-        ChoiceRow(
-            "Units",
-            listOf(Units.AUTO to "Auto", Units.IMPERIAL to "Imperial (mi, ft, °F)", Units.METRIC to "Metric (km, m, °C)"),
-            units,
-        ) { CarSettings.setUnits(it) }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_map_day_night),
+                    listOf(NightMode.AUTO to stringResource(R.string.choice_auto), NightMode.DAY to stringResource(R.string.choice_night_day), NightMode.NIGHT to stringResource(R.string.choice_night_night)),
+                    night,
+                ) { CarSettings.setNightMode(it) }
+            }
 
-        ChoiceRow(
-            "Player in the nav bar",
-            listOf(false to "Skip buttons", true to "Song title"),
-            playerTitle,
-        ) { CarSettings.setPlayerTitle(it) }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_units),
+                    listOf(Units.AUTO to stringResource(R.string.choice_auto), Units.IMPERIAL to stringResource(R.string.carset_imperial), Units.METRIC to stringResource(R.string.carset_metric)),
+                    units,
+                ) { CarSettings.setUnits(it) }
+            }
 
-        ChoiceRow(
-            "Autoplay on connect",
-            listOf(false to "Off", true to "On"),
-            autoplay,
-        ) { CarSettings.setAutoplay(it) }
+            // For a head unit that reports the wrong size and stretches the picture (issue #12).
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.carset_screen_size),
+                    listOf<ScreenSize?>(null).plus(SCREEN_PRESETS).plus(screenSize).distinct()
+                        .map { it to (it?.toString() ?: stringResource(R.string.screen_from_car)) },
+                    screenSize,
+                ) { CarSettings.setScreenSize(it) }
+            }
 
-        ChoiceRow(
-            "Car audio",
-            listOf(false to "Bluetooth", true to "USB"),
-            pipeAudio,
-        ) { CarSettings.setPipeAudio(it) }
-        Text(
-            "USB sends the phone's sound through Gearslip. Android asks to share your screen each " +
-                "drive, and a few apps block it. Bluetooth plays as the phone normally would, and " +
-                "Android never asks.",
-            style = MaterialTheme.typography.bodySmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-        )
-        if (!pipeAudio) {
-            ChoiceRow(
-                "Warn when Bluetooth isn't connected",
-                listOf(false to "Off", true to "On"),
-                bluetoothWarning,
-            ) { CarSettings.setBluetoothWarning(it) }
-        }
-        ChoiceRow(
-            "Warn when location is off",
-            listOf(false to "Off", true to "On"),
-            locationWarning,
-        ) { CarSettings.setLocationWarning(it) }
+            if (section == chosen && screenSize != null) item {
+                ChoiceRow(
+                    stringResource(R.string.carset_fit),
+                    listOf(ScreenFit.CROP to stringResource(R.string.screen_crop), ScreenFit.SQUASH to stringResource(R.string.screen_squash)),
+                    screenFit,
+                ) { CarSettings.setScreenFit(it) }
+            }
 
-        ChoiceRow(
-            "Spoken directions",
-            listOf(false to "Off", true to "On"),
-            speakDirections,
-        ) { CarSettings.setSpeakDirections(it) }
-        Text(
-            "Gearslip reads each turn aloud through the car's speakers, and the music dips while it " +
-                "speaks. Turn it off if your map app's own voice already plays in the car.",
-            style = MaterialTheme.typography.bodySmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-        )
+            section = 1
+            if (section == chosen) item { Group(stringResource(R.string.car_group_nav_bar)) }
 
-        ExperimentalFeatureRow(
-            title = "Use the phone's speech recognition",
-            description = "Listens through the phone's own speech service instead of Gearslip's. On " +
-                "most phones that's Google's, which may send your voice to Google. GrapheneOS has " +
-                "none, so Gearslip keeps using its own.",
-            checked = systemSpeech,
-        ) { CarSettings.setSystemSpeech(it) }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_nav_bar),
+                    listOf(
+                        NavBarMode.SHOW to stringResource(R.string.choice_nav_show),
+                        NavBarMode.HIDE_NAVIGATING to stringResource(R.string.choice_nav_hide_navigating),
+                        NavBarMode.HIDE to stringResource(R.string.choice_nav_hide),
+                    ),
+                    navBar,
+                ) { CarSettings.setNavBarMode(it) }
+            }
 
-        WebPageSetting()
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_player_nav_bar),
+                    listOf(false to stringResource(R.string.car_skip_buttons), true to stringResource(R.string.car_song_title)),
+                    playerTitle,
+                ) { CarSettings.setPlayerTitle(it) }
+            }
 
-        ScreenFit(vehicle)
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_player_beside_map),
+                    listOf(false to stringResource(R.string.car_right), true to stringResource(R.string.car_left)),
+                    playerLeft,
+                ) { CarSettings.setPlayerLeft(it) }
+            }
 
-        ChoiceRow(
-            "Experimental features",
-            listOf(false to "Hide", true to "Show"),
-            experimentalFeatures,
-        ) { CarSettings.setExperimentalFeaturesEnabled(it) }
-        if (experimentalFeatures) {
-            ExperimentalFeaturesList(carSensors)
-        }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_autoplay),
+                    listOf(false to stringResource(R.string.off), true to stringResource(R.string.on)),
+                    autoplay,
+                ) { CarSettings.setAutoplay(it) }
+            }
 
-        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-            Text("Connection", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
-            Info("Phone", "${Build.MANUFACTURER} ${Build.MODEL}")
-            Info("Vehicle", vehicle.ifEmpty { "-" })
-            Info("Video", display.ifEmpty { "-" })
-            Info("Certificate", cert?.headline ?: "Checking…")
-        }
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.carset_lyrics_from),
+                    listOf(false to "LRCLIB", true to stringResource(R.string.carset_more_sources)),
+                    moreLyrics,
+                ) { CarSettings.setMoreLyrics(it) }
+            }
 
-        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-            Text("About", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
-            Info("Version", app.seb3thehacker.gearslip.BuildConfig.VERSION_NAME)
-            Info("Build", app.seb3thehacker.gearslip.BuildConfig.VERSION_CODE.toString())
-            ExperimentalFeatureRow(
-                "What's new after updates",
-                "Show the list of changes once, the first time the car connects after an update.",
-                whatsNew,
-            ) { CarSettings.setWhatsNewAfterUpdates(it) }
-            GsButton(onClick = CarSettings::openWhatsNew, tone = GsTone.Tonal, modifier = Modifier.height(56.dp)) {
-                Text("What's new", style = MaterialTheme.typography.titleMedium)
+            section = 2
+            if (section == chosen) item { Group(stringResource(R.string.car_group_sound)) }
+
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_audio),
+                    listOf(false to stringResource(R.string.guide_audio_bluetooth), true to stringResource(R.string.guide_audio_usb)),
+                    pipeAudio,
+                ) { CarSettings.setPipeAudio(it) }
+            }
+
+            if (section == chosen) item {
+                Text(
+                    stringResource(R.string.carset_audio_note),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+
+            section = 3
+            if (section == chosen) item { Group(stringResource(R.string.car_group_warnings)) }
+
+            if (section == chosen && !pipeAudio) item {
+                ChoiceRow(
+                    stringResource(R.string.car_warn_bluetooth),
+                    listOf(false to stringResource(R.string.off), true to stringResource(R.string.on)),
+                    bluetoothWarning,
+                ) { CarSettings.setBluetoothWarning(it) }
+            }
+
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_warn_location),
+                    listOf(false to stringResource(R.string.off), true to stringResource(R.string.on)),
+                    locationWarning,
+                ) { CarSettings.setLocationWarning(it) }
+            }
+
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_spoken_directions),
+                    listOf(false to stringResource(R.string.off), true to stringResource(R.string.on)),
+                    speakDirections,
+                ) { CarSettings.setSpeakDirections(it) }
+            }
+
+            if (section == chosen) item {
+                Text(
+                    stringResource(R.string.carset_directions_note),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+
+            if (section == chosen && speakDirections) item {
+                ChoiceRow(
+                    stringResource(R.string.car_directions_over_music),
+                    listOf(false to stringResource(R.string.off), true to stringResource(R.string.on)),
+                    directionsOverMusic,
+                ) { CarSettings.setDirectionsOverMusic(it) }
+            }
+
+            if (section == chosen && speakDirections) item {
+                Text(
+                    stringResource(R.string.car_directions_over_music_note),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+
+            if (section == chosen) item {
+                ExperimentalFeatureRow(
+                    title = stringResource(R.string.car_phone_speech),
+                    description = stringResource(R.string.carset_phone_speech_note),
+                    checked = systemSpeech,
+                ) { CarSettings.setSystemSpeech(it) }
+            }
+
+            section = 4
+            if (section == chosen) item { Group(stringResource(R.string.car_group_more)) }
+
+            if (section == chosen) item {
+                WebPageSetting()
+            }
+
+            if (section == chosen) item {
+                ScreenFit(vehicle)
+            }
+
+            if (section == chosen) item {
+                ChoiceRow(
+                    stringResource(R.string.car_experimental),
+                    listOf(false to stringResource(R.string.carset_hide), true to stringResource(R.string.carset_show)),
+                    experimentalFeatures,
+                ) { CarSettings.setExperimentalFeaturesEnabled(it) }
+            }
+
+            if (section == chosen && experimentalFeatures) item {
+                ExperimentalFeaturesList(carSensors, adaptiveVideo, clusterVideo)
+            }
+
+            if (section == chosen) item {
+                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                    Text(stringResource(R.string.settings_connection), style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+                    Info(stringResource(R.string.carset_phone), "${Build.MANUFACTURER} ${Build.MODEL}")
+                    Info(stringResource(R.string.carset_vehicle), vehicle.ifEmpty { "-" })
+                    Info(stringResource(R.string.carset_video), display.ifEmpty { "-" })
+                    Info(stringResource(R.string.settings_certificate), cert?.headline ?: stringResource(R.string.cert_checking))
+                }
+            }
+
+            if (section == chosen) item {
+                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                    Text(stringResource(R.string.settings_about), style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+                    Info(stringResource(R.string.carset_version), app.seb3thehacker.gearslip.BuildConfig.VERSION_NAME)
+                    Info(stringResource(R.string.carset_build), app.seb3thehacker.gearslip.BuildConfig.VERSION_CODE.toString())
+                    ExperimentalFeatureRow(
+                        stringResource(R.string.carset_whats_new_after),
+                        stringResource(R.string.carset_whats_new_after_sub),
+                        whatsNew,
+                    ) { CarSettings.setWhatsNewAfterUpdates(it) }
+                    GsButton(onClick = CarSettings::openWhatsNew, tone = GsTone.Tonal, modifier = Modifier.height(56.dp)) {
+                        Text(stringResource(R.string.settings_whats_new), style = MaterialTheme.typography.titleMedium)
+                    }
+                }
             }
         }
     }
@@ -211,8 +366,78 @@ fun CarSettingsScreen() {
 
 @Composable
 private fun <T> ChoiceRow(title: String, options: List<Pair<T, String>>, selected: T, onSelect: (T) -> Unit) {
-    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-        Text(title, style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+    // On a wide screen the name sits beside its choices, which halves how far there is to scroll.
+    androidx.compose.foundation.layout.BoxWithConstraints(Modifier.fillMaxWidth()) {
+        if (maxWidth >= 720.dp && options.size <= 4) {
+            Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(16.dp)) {
+                Text(title, style = MaterialTheme.typography.titleMedium, modifier = Modifier.weight(0.3f))
+                Box(Modifier.weight(0.7f)) { ChoiceButtons(options, selected, onSelect) }
+            }
+        } else {
+            Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                Text(title, style = MaterialTheme.typography.titleMedium)
+                ChoiceButtons(options, selected, onSelect)
+            }
+        }
+    }
+}
+
+/** The groups, with the chosen one lit: a card down the left of Settings. */
+@Composable
+private fun SettingsRail(groups: List<String>, chosen: Int, onChoose: (Int) -> Unit) {
+    val scheme = MaterialTheme.colorScheme
+    val shape = RoundedCornerShape(24.dp)
+    Surface(
+        Modifier.width(250.dp).padding(bottom = 12.dp).fillMaxHeight().gsPanelShadow(shape),
+        shape = shape,
+        color = scheme.surfaceContainer,
+    ) {
+        Column(
+            Modifier.padding(10.dp).verticalScroll(androidx.compose.foundation.rememberScrollState()),
+            verticalArrangement = Arrangement.spacedBy(4.dp),
+        ) {
+            Text(
+                stringResource(R.string.settings_title),
+                style = MaterialTheme.typography.headlineSmall,
+                fontWeight = FontWeight.Bold,
+                modifier = Modifier.padding(start = 14.dp, top = 6.dp, bottom = 10.dp),
+            )
+            groups.forEachIndexed { i, name ->
+                val on = i == chosen
+                GsIconBox(
+                    onClick = { onChoose(i) },
+                    modifier = Modifier.fillMaxWidth().height(56.dp),
+                    colors = if (on) GsColors(scheme.primaryContainer, scheme.onPrimaryContainer)
+                    else GsColors(Color.Transparent, scheme.onSurface),
+                    latched = on,
+                ) {
+                    Text(
+                        name,
+                        style = MaterialTheme.typography.titleMedium,
+                        fontWeight = if (on) FontWeight.Bold else FontWeight.Normal,
+                        modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp),
+                    )
+                }
+            }
+        }
+    }
+}
+
+/** A group of settings: a heading, so a long list reads as a few short ones. */
+@Composable
+private fun Group(title: String) {
+    Text(
+        title,
+        style = MaterialTheme.typography.titleLarge,
+        fontWeight = FontWeight.Bold,
+        color = MaterialTheme.colorScheme.primary,
+        modifier = Modifier.padding(top = 12.dp),
+    )
+}
+
+@Composable
+private fun <T> ChoiceButtons(options: List<Pair<T, String>>, selected: T, onSelect: (T) -> Unit) {
+    run {
         Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(12.dp)) {
             options.forEach { (value, label) ->
                 val on = value == selected
@@ -239,19 +464,26 @@ private fun <T> ChoiceRow(title: String, options: List<Pair<T, String>>, selecte
  * so the list reads fine whether there's one entry or several.
  */
 @Composable
-private fun ExperimentalFeaturesList(carSensors: Boolean) {
+private fun ExperimentalFeaturesList(carSensors: Boolean, adaptiveVideo: Boolean, clusterVideo: Boolean) {
     Column(
         Modifier.fillMaxWidth(),
         verticalArrangement = Arrangement.spacedBy(10.dp),
     ) {
         ExperimentalFeatureRow(
-            title = "Vehicle data",
-            description = "Adds a Vehicle data tile: a live, raw dump of the head unit's sensor " +
-                "channel. Field labels (speed, RPM, fuel...) are carried over from other " +
-                "reverse-engineering projects and unverified against this car - treat them as a " +
-                "guess, not a fact, until you've watched one change for yourself.",
+            title = stringResource(R.string.car_vehicle_data),
+            description = stringResource(R.string.carset_vehicle_data_note),
             checked = carSensors,
         ) { CarSettings.setCarSensorsEnabled(it) }
+        ExperimentalFeatureRow(
+            title = stringResource(R.string.car_adaptive_video),
+            description = stringResource(R.string.carset_adaptive_note),
+            checked = adaptiveVideo,
+        ) { CarSettings.setAdaptiveVideoEnabled(it) }
+        ExperimentalFeatureRow(
+            title = stringResource(R.string.car_cluster_video),
+            description = stringResource(R.string.car_cluster_video_note),
+            checked = clusterVideo,
+        ) { CarSettings.setClusterVideoEnabled(it) }
     }
 }
 
@@ -297,7 +529,7 @@ private fun WebPageSetting() {
     var url by remember { mutableStateOf(AppSettings.startupUrl(context)) }
 
     Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-        Text("Web page", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+        Text(stringResource(R.string.web_page), style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
         Surface(
             onClick = { editing = !editing },
             shape = MaterialTheme.shapes.large,
@@ -305,7 +537,7 @@ private fun WebPageSetting() {
             modifier = Modifier.fillMaxWidth(),
         ) {
             Text(
-                url.ifEmpty { "DuckDuckGo (default) - tap to set a different page" },
+                url.ifEmpty { stringResource(R.string.carset_web_default) },
                 style = MaterialTheme.typography.bodyLarge,
                 color = if (url.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
                 maxLines = 1,
@@ -314,7 +546,7 @@ private fun WebPageSetting() {
             )
         }
         Text(
-            "Shown by the Browser app on the launcher. Applies on the next connection.",
+            stringResource(R.string.carset_web_note),
             style = MaterialTheme.typography.bodySmall,
             color = MaterialTheme.colorScheme.onSurfaceVariant,
         )
@@ -357,22 +589,22 @@ private fun ScreenFit(vehicle: String) {
     }
 
     Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-        Text("Screen fit", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
-        Stepper("Top", insets.top) { change(insets.copy(top = (insets.top + it).coerceAtLeast(0))) }
-        Stepper("Bottom", insets.bottom) { change(insets.copy(bottom = (insets.bottom + it).coerceAtLeast(0))) }
+        Text(stringResource(R.string.carset_screen_fit), style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+        Stepper(stringResource(R.string.carset_top), insets.top) { change(insets.copy(top = (insets.top + it).coerceAtLeast(0))) }
+        Stepper(stringResource(R.string.carset_bottom), insets.bottom) { change(insets.copy(bottom = (insets.bottom + it).coerceAtLeast(0))) }
         Text(
-            "Usable height ${480 - insets.top - insets.bottom}px of 480",
+            stringResource(R.string.carset_usable_height, 480 - insets.top - insets.bottom),
             style = MaterialTheme.typography.bodyMedium,
             color = MaterialTheme.colorScheme.onSurfaceVariant,
         )
         GsButton(
             onClick = {
                 val ok = app.seb3thehacker.gearslip.VehicleProfiles.saveInsets(context, vehicle, insets)
-                saved = if (ok) "Saved to $vehicle" else "Could not save"
+                saved = if (ok) context.getString(R.string.carset_saved_to, vehicle) else context.getString(R.string.carset_save_failed)
             },
             enabled = known,
             modifier = Modifier.fillMaxWidth().height(56.dp),
-        ) { Text(if (known) "Save for this vehicle" else "No vehicle profile matched") }
+        ) { Text(if (known) stringResource(R.string.carset_save_vehicle) else stringResource(R.string.carset_no_profile)) }
         saved?.let { Text(it, style = MaterialTheme.typography.bodyMedium) }
     }
 }
@@ -384,7 +616,7 @@ private fun Stepper(label: String, value: Int, onStep: (Int) -> Unit) {
         StepButton("−5", Modifier.weight(1f)) { onStep(-5) }
         StepButton("−1", Modifier.weight(1f)) { onStep(-1) }
         Text(
-            "${value}px",
+            stringResource(R.string.carset_px, value),
             style = MaterialTheme.typography.titleLarge,
             modifier = Modifier.weight(1.3f),
             textAlign = androidx.compose.ui.text.style.TextAlign.Center,
@@ -406,3 +638,8 @@ private fun StepButton(text: String, modifier: Modifier, onClick: () -> Unit) {
     }
 }
 
+/** Common car screen sizes; Settings on the phone takes any other. */
+private val SCREEN_PRESETS = listOf(
+    ScreenSize(800, 480), ScreenSize(1024, 600), ScreenSize(1280, 480), ScreenSize(1280, 720),
+    ScreenSize(1440, 540), ScreenSize(1920, 720), ScreenSize(1920, 1080),
+)

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarUi.kt

@@ -1,5 +1,9 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import androidx.compose.material.icons.filled.Call
+import app.seb3thehacker.gearslip.call.CarCalls
+import app.seb3thehacker.gearslip.call.CallUiState
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.LocalIndication
@@ -59,6 +63,8 @@ import androidx.compose.runtime.setValue
 import androidx.compose.animation.animateContentSize
 import android.media.session.PlaybackState
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -72,6 +78,7 @@ import androidx.compose.ui.res.vectorResource
 import androidx.compose.ui.text.style.TextOverflow
 import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.GsColors
+import app.seb3thehacker.gearslip.car.theme.withTintedSurfaces
 import app.seb3thehacker.gearslip.car.theme.GsIconBox
 import app.seb3thehacker.gearslip.car.theme.GsIconButton
 import app.seb3thehacker.gearslip.car.theme.GsButton
@@ -106,6 +113,7 @@ fun CarUi() {
     val phoneDark by CarEnvironment.phoneDark.collectAsState()
     val appTheme by CarSettings.appTheme.collectAsState()
     val uiThemeId by CarSettings.uiTheme.collectAsState()
+    val darkStyle by CarSettings.darkStyle.collectAsState()
     val mediaApp by CarServices.mediaApp.collectAsState()
     val darkOutside by CarEnvironment.darkOutside.collectAsState()
     val appContext = LocalContext.current.applicationContext
@@ -114,15 +122,21 @@ fun CarUi() {
         AppTheme.LIGHT -> false
         AppTheme.DARK -> true
     }
-    val colors = if (dark) dynamicDarkColorScheme(appContext) else dynamicLightColorScheme(appContext)
+    val colors = (if (dark) dynamicDarkColorScheme(appContext) else dynamicLightColorScheme(appContext)).withTintedSurfaces(dark, darkStyle)
     val base = LocalDensity.current
     val insets by CarEnvironment.insets.collectAsState()
-    val navigator = remember { CarNavigator(CarSettings.openOnConnect.value) }
+    val navigator = remember {
+        // A start screen picked for the car may be one launcher mode hides, like Screen sharing.
+        val start = CarSettings.openOnConnect.value
+        val shown = CarApps.shown(LauncherMode.active.value, LauncherMode.canCall(appContext)).any { it.id == start }
+        CarNavigator(if (shown) start else CarSettings.HOME)
+    }
     val controlsWake = remember { MapControlsWake() }
     LaunchedEffect(controlsWake) {
         while (true) {
             delay(250)
             controlsWake.tick()
+            CarFullscreen.tick()
         }
     }
     // The knob counts as a touch: the map's buttons can't be found while they're faded out.
@@ -193,17 +207,34 @@ fun CarUi() {
                     .fillMaxSize()
                     // Watches every touch without taking any: first in line, consumes nothing.
                     .pointerInput(controlsWake) {
+                        // In full screen, a swipe that starts at the top or bottom edge brings the
+                        // nav bar back. Only from the very edge, so scrolling a page still scrolls.
+                        val edge = 32.dp.toPx()
+                        val slop = 24.dp.toPx()
+                        var startY = -1f
                         awaitPointerEventScope {
                             while (true) {
-                                awaitPointerEvent(PointerEventPass.Initial)
+                                val event = awaitPointerEvent(PointerEventPass.Initial)
                                 controlsWake.touch()
+                                CarFullscreen.touch()
+                                val change = event.changes.firstOrNull() ?: continue
+                                if (!CarFullscreen.active) continue
+                                if (change.pressed && !change.previousPressed) {
+                                    val y = change.position.y
+                                    startY = if (y < edge || y > size.height - edge) y else -1f
+                                } else if (startY >= 0f && change.pressed && kotlin.math.abs(change.position.y - startY) > slop) {
+                                    CarFullscreen.reveal()
+                                    startY = -1f
+                                }
                             }
                         }
                     },
                 color = MaterialTheme.colorScheme.background,
             ) {
-                // Insets are in video-frame pixels, so convert with the un-scaled density.
-                val pad = with(base) {
+                // Insets are video-frame pixels. Resolve them with the live (size-scaled) density,
+                // which padding() also uses, so the safe-area margin stays one fixed physical size
+                // at every size setting instead of growing with it and eating the screen's sides.
+                val pad = with(LocalDensity.current) {
                     PaddingValues(
                         start = insets.left.toDp(), top = insets.top.toDp(),
                         end = insets.right.toDp(), bottom = insets.bottom.toDp(),
@@ -211,6 +242,26 @@ fun CarUi() {
                 }
                 val screen = navigator.current
                 val safetyWarningSeen by CarSettings.hasSeenSafetyWarning.collectAsState()
+                val keyboardVisible by CarKeyboardVisibility.state
+                // The bar always lies over the map and every other screen rather than taking a row
+                // of its own: hiding it then leaves the map's surface the size it was.
+                // Resizing it would hand the map app a new surface each time, and some go black on that.
+                val navBarMode by CarSettings.navBarMode.collectAsState()
+                val appTemplate by CarServices.nav.template.collectAsState()
+                val barMayHide = screen == CarScreen.Home && when (navBarMode) {
+                    NavBarMode.SHOW -> false
+                    NavBarMode.HIDE_NAVIGATING -> appTemplate is androidx.car.app.navigation.model.NavigationTemplate
+                    NavBarMode.HIDE -> true
+                }
+                // A full wait from when hiding becomes possible, not from whenever the last touch was.
+                LaunchedEffect(barMayHide) { if (barMayHide) controlsWake.touch() }
+                // A call keeps the bar up whatever the setting: End and Mute live on it.
+                val onCall = CarCalls.state.collectAsState().value is CallUiState.Active
+                val barShown = !keyboardVisible && (!barMayHide || controlsWake.navBarAwake || onCall)
+                // Up to the bar's top edge, so the map's cards and the player end above it.
+                val homeInset = if (barShown) NAV_BAR_HEIGHT else 0.dp
+                // Only the screen that asked: going Home or anywhere else ends it.
+                val fullscreen = CarFullscreen.active && screen != CarScreen.Home
                 Box(Modifier.fillMaxSize().padding(pad)) {
                 Column(Modifier.fillMaxSize()) {
                     if (!safetyWarningSeen) {
@@ -223,31 +274,63 @@ fun CarUi() {
                         // Home never leaves the composition; other screens cover it. Dropping it
                         // would tear down the map's surface, and coming back would then show black
                         // while the nav app redrew on a new one.
-                        CarHome()
+                        CompositionLocalProvider(LocalNavBarInset provides homeInset) { CarHome() }
+                    }
+                    // The keyboard takes the nav bar's row instead of squeezing in above it -
+                    // nothing on the nav bar is useful mid-type, and the screen is too small to
+                    // show both.
+                }
+                // Every other screen, and everything that pops up, in a layer over Home rather
+                // than inside its area: full screen grows this layer over the nav bar's row while
+                // Home, and the map's surface in it, keeps its size.
+                // Each new screen fades in while rising a little, once, over a fifth of a second.
+                // Coming from Home the backdrop fades in with it, over the map; between two other
+                // screens it stays put, so the map never flashes through.
+                val lastScreen = remember { arrayOf<CarScreen>(CarScreen.Home) }
+                val fromHome = remember(screen) { lastScreen[0] == CarScreen.Home }
+                SideEffect { lastScreen[0] = screen }
+                val enter = remember(screen) { androidx.compose.animation.core.Animatable(0f) }
+                LaunchedEffect(screen) { enter.animateTo(1f, androidx.compose.animation.core.tween(180)) }
+                if (safetyWarningSeen) {
+                    Box(Modifier.fillMaxSize()) {
                         if (screen != CarScreen.Home) {
                             Box(
                                 Modifier
                                     .fillMaxSize()
+                                    .graphicsLayer { if (fromHome) alpha = enter.value }
                                     .background(MaterialTheme.colorScheme.background)
+                                    // The bar never hides here, so keep the screen clear of it. The
+                                    // player runs on under the see-through bar and keeps clear itself.
+                                    .padding(bottom = if (!keyboardVisible && !fullscreen && screen != CarScreen.Media) NAV_BAR_HEIGHT else 0.dp)
                                     // Keeps touches that miss this screen's controls off the map.
                                     .pointerInput(Unit) { detectTapGestures { } },
                             ) {
-                                when (screen) {
-                                    CarScreen.Home -> Unit
-                                    CarScreen.Apps -> CarLauncher()
-                                    CarScreen.Media -> mediaApp?.let { MediaScreen(it) { navigator.back() } }
-                                    CarScreen.Browse -> BrowseAppScreen(navigator)
-                                    CarScreen.Settings -> CarSettingsScreen()
-                                    CarScreen.Dashboard -> CarDashboardScreen()
-                                    CarScreen.Weather -> WeatherScreen()
-                                    CarScreen.VehicleData -> VehicleDataScreen()
-                                    is CarScreen.Notifications -> NotificationsScreen(screen.replyTo)
-                                    is CarScreen.Messages -> MessagesScreen(screen.packageName)
-                                    is CarScreen.App -> CarApps.find(screen.id)?.content?.invoke()
+                                Box(
+                                    Modifier.fillMaxSize().graphicsLayer {
+                                        if (!fromHome) alpha = enter.value
+                                        translationY = (1f - enter.value) * 16.dp.toPx()
+                                    },
+                                ) {
+                                    when (screen) {
+                                        CarScreen.Home -> Unit
+                                        CarScreen.Apps -> CarLauncher()
+                                        CarScreen.Media -> CompositionLocalProvider(
+                                            LocalNavBarInset provides if (!keyboardVisible && !fullscreen) NAV_BAR_HEIGHT else 0.dp,
+                                        ) { mediaApp?.let { MediaScreen(it) { navigator.back() } } }
+                                        CarScreen.Browse -> BrowseAppScreen(navigator)
+                                        CarScreen.Settings -> CarSettingsScreen()
+                                        CarScreen.Dashboard -> CarDashboardScreen()
+                                        CarScreen.Weather -> WeatherScreen()
+                                        CarScreen.VehicleData -> VehicleDataScreen()
+                                        is CarScreen.Notifications -> NotificationsScreen(screen.replyTo)
+                                        is CarScreen.Messages -> MessagesScreen(screen.packageName)
+                                        is CarScreen.App -> CarApps.find(screen.id)?.content?.invoke()
+                                    }
                                 }
                             }
                         }
-                        CarToastOverlay(Modifier.align(Alignment.BottomCenter))
+                        CarToastOverlay(Modifier.align(Alignment.BottomCenter).padding(bottom = homeInset))
+                        CarAlertOverlay(Modifier.align(Alignment.TopCenter))
                         CallPromptOverlay()
                         BluetoothPairOverlay()
                         PopupTimer()
@@ -258,21 +341,39 @@ fun CarUi() {
                         )
                         // Above the popup: a call is more urgent than any notification.
                         VoiceHelpOverlay(Modifier.align(Alignment.Center))
-                        CallOverlay(Modifier.align(Alignment.TopCenter))
-                        AssistantOverlay(Modifier.align(Alignment.BottomCenter))
-                        if (app.seb3thehacker.gearslip.BuildConfig.DEBUG) {
+                        CallOverlay()
+                        AssistantOverlay(Modifier.align(Alignment.BottomCenter).padding(bottom = homeInset))
+                        val badge by CarSettings.debugBadge.collectAsState()
+                        if (app.seb3thehacker.gearslip.BuildConfig.DEBUG && badge) {
                             // Bottom corner, not top: a screen's own header almost always puts
                             // something in the top-right (settings, search, a Liked Songs
                             // shortcut) and this badge used to sit right on top of it, hiding
                             // whatever the screen drew there.
-                            DebugBuildBadge(Modifier.align(Alignment.BottomEnd))
+                            DebugBuildBadge(Modifier.align(Alignment.BottomEnd).padding(bottom = homeInset))
+                        }
+                        run {
+                            androidx.compose.animation.AnimatedVisibility(
+                                if (fullscreen) CarFullscreen.revealed || onCall else barShown,
+                                Modifier.align(Alignment.BottomCenter),
+                                enter = androidx.compose.animation.slideInVertically { it },
+                                exit = androidx.compose.animation.slideOutVertically { it },
+                            ) { CarNavBar(navigator) }
+                        }
+                        if (fullscreen) {
+                            androidx.compose.animation.AnimatedVisibility(
+                                CarFullscreen.revealed,
+                                Modifier.align(Alignment.TopCenter).padding(top = 12.dp),
+                                enter = androidx.compose.animation.slideInVertically { -it },
+                                exit = androidx.compose.animation.slideOutVertically { -it },
+                            ) {
+                                GsButton(onClick = CarFullscreen::exit, modifier = Modifier.height(48.dp)) {
+                                    Icon(MediaIcons.FullscreenExit, contentDescription = null, modifier = Modifier.size(22.dp))
+                                    Spacer(Modifier.width(8.dp))
+                                    Text(stringResource(R.string.carui_exit_fullscreen), style = MaterialTheme.typography.titleMedium)
+                                }
+                            }
                         }
                     }
-                    // The keyboard takes the nav bar's row instead of squeezing in above it -
-                    // nothing on the nav bar is useful mid-type, and the screen is too small to
-                    // show both.
-                    val keyboardVisible by CarKeyboardVisibility.state
-                    if (!keyboardVisible) CarNavBar(navigator)
                 }
                 // Over everything, nav bar included: a long press on an app, anywhere.
                 AppMenu(navigator, rememberRunningApps())
@@ -284,6 +385,14 @@ fun CarUi() {
     }
 }
 
+internal val NAV_BAR_HEIGHT = 56.dp
+
+/**
+ * How much of the bottom of Home the floating nav bar covers right now: its height while it shows,
+ * zero while it's hidden or when it has a row of its own.
+ */
+internal val LocalNavBarInset = androidx.compose.runtime.compositionLocalOf { 0.dp }
+
 /**
  * A single blocking screen, shown once per install before anything else the car screen can show -
  * Home included. The phone's own setup guide carries the same warning, but a driver who plugs in
@@ -305,22 +414,20 @@ private fun CarSafetyWizard(onDone: () -> Unit) {
                 modifier = Modifier.fillMaxWidth(),
             ) {
                 Column(Modifier.padding(24.dp), verticalArrangement = Arrangement.spacedBy(12.dp)) {
-                    Text("Drive safely", style = ChromeType.headline, fontWeight = FontWeight.Bold)
+                    Text(stringResource(R.string.carui_drive_safely), style = ChromeType.headline, fontWeight = FontWeight.Bold)
                     Text(
-                        "Gearslip is unofficial software: it is not made or reviewed by any " +
-                            "carmaker, and it can fail without warning.",
+                        stringResource(R.string.carui_unofficial),
                         style = ChromeType.body,
                     )
                     Text(
-                        "Never interact with this screen while driving. Set the route or the " +
-                            "song before you go, then keep your attention on the road.",
+                        stringResource(R.string.carui_never_interact),
                         style = ChromeType.body,
                     )
                 }
             }
             Spacer(Modifier.height(24.dp))
             GsButton(onClick = onDone, modifier = Modifier.fillMaxWidth().height(56.dp)) {
-                Text("I understand", style = ChromeType.body)
+                Text(stringResource(R.string.carui_understand), style = ChromeType.body)
             }
         }
     }
@@ -351,7 +458,7 @@ private fun BrowseAppScreen(navigator: CarNavigator) {
     }
     val failed = status.phase == CarAppConnection.Phase.REJECTED || status.phase == CarAppConnection.Phase.FAILED
     if (failed || timedOut) {
-        AppWontStart(status.app ?: "This app", leave)
+        AppWontStart(status.app ?: stringResource(R.string.carui_this_app), leave)
         return
     }
     CarAppStage(CarServices.browse, status, frame, onDisconnect = leave)
@@ -367,13 +474,13 @@ private fun AppWontStart(app: String, onBack: () -> Unit) {
         verticalArrangement = Arrangement.spacedBy(12.dp, Alignment.CenterVertically),
         horizontalAlignment = Alignment.CenterHorizontally,
     ) {
-        Text("$app doesn't work with Gearslip yet.", style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.SemiBold)
+        Text(stringResource(R.string.carui_app_unsupported, app), style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.SemiBold)
         Text(
-            "It didn't start. Some apps only run on Google's Android Auto.",
+            stringResource(R.string.carui_app_unsupported_body),
             style = MaterialTheme.typography.bodyLarge,
             color = MaterialTheme.colorScheme.onSurfaceVariant,
         )
-        GsButton(onClick = onBack, tone = GsTone.Tonal) { Text("Back") }
+        GsButton(onClick = onBack, tone = GsTone.Tonal) { Text(stringResource(R.string.back)) }
     }
 }
 
@@ -398,512 +505,6 @@ private fun DebugBuildBadge(modifier: Modifier = Modifier) {
     }
 }
 
-/**
- * "Home > Apps > Settings", like a file manager's address bar: hidden at Home itself (nothing to
- * show yet), and grows by one crumb for every screen pushed from there. The back arrow undoes one
- * step; a crumb jumps straight to it, dropping everything after - this is the only on-screen way
- * back at all, since a car touchscreen has no hardware button for it.
- */
-@Composable
-private fun BreadcrumbBar(navigator: CarNavigator) {
-    val trail = navigator.trail
-    if (trail.size <= 1) return
-    Row(
-        Modifier.fillMaxWidth().height(40.dp).padding(start = 2.dp, end = 10.dp),
-        verticalAlignment = Alignment.CenterVertically,
-    ) {
-        GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, "Back", navigator::back, size = 32.dp, iconSize = 20.dp)
-        Spacer(Modifier.width(2.dp))
-        trail.forEachIndexed { index, crumb ->
-            val isLast = index == trail.lastIndex
-            Text(
-                crumb.label,
-                style = MaterialTheme.typography.labelLarge,
-                fontWeight = if (isLast) FontWeight.SemiBold else FontWeight.Normal,
-                color = if (isLast) MaterialTheme.colorScheme.onSurface else MaterialTheme.colorScheme.onSurfaceVariant,
-                maxLines = 1,
-                overflow = TextOverflow.Ellipsis,
-                modifier = if (isLast) Modifier else Modifier
-                    .clip(RoundedCornerShape(6.dp))
-                    .clickable { navigator.jumpTo(index) }
-                    .padding(horizontal = 4.dp, vertical = 2.dp),
-            )
-            if (!isLast) {
-                Text(
-                    "›",
-                    style = MaterialTheme.typography.labelLarge,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                    modifier = Modifier.padding(horizontal = 2.dp),
-                )
-            }
-        }
-    }
-}
-
-/**
- * Apps and open/pinned shortcuts on the left; now-playing pill against them; clock (tap for
- * calendar and weather), phone battery and the darkness signal on the right. Icon-only: a driver
- * reads a glyph faster than a label, and it keeps the bar short enough to leave the app underneath
- * more room.
- */
-@Composable
-private fun CarNavBar(navigator: CarNavigator) {
-    val battery by CarEnvironment.battery.collectAsState()
-    val now by rememberNow()
-    val weather by Weather.state.collectAsState()
-    val weatherData = (weather as? WeatherState.Ready)?.data
-
-    val pinnedIds by CarSettings.pinnedApps.collectAsState()
-    val entries = rememberAllEntries()
-    val pinnedEntries = remember(entries, pinnedIds) {
-        pinnedIds.mapNotNull { id -> entries.find { it.componentId == id } }
-    }
-    val frame by CarEnvironment.frame.collectAsState()
-    val running = rememberRunningApps()
-
-    Surface(color = MaterialTheme.colorScheme.surfaceContainer) {
-        BoxWithConstraints(Modifier.fillMaxWidth().height(56.dp).padding(horizontal = 10.dp)) {
-            Row(Modifier.fillMaxSize(), verticalAlignment = Alignment.CenterVertically) {
-                // Home and Apps are two different places now, not a toggle on one button - the
-                // breadcrumb trail is how you retrace your steps, but reaching for either of
-                // these two from three screens deep in a media app shouldn't mean reading it
-                // first.
-                NavHomeButton(navigator, entries, running)
-                Spacer(Modifier.width(6.dp))
-                NavItem(MediaIcons.Apps, navigator.current == CarScreen.Apps) { navigator.apps() }
-                Spacer(Modifier.width(6.dp))
-                NavAssistantIcon()
-
-                // Pinned shortcuts, then whatever else is open right now. A pinned app that's also
-                // open stays in its pinned spot, marked with a dot, instead of showing up twice.
-                // The map app lives on the Home button, so it never gets a second icon here.
-                val runningEntries = running.keys
-                    .filter { it !in pinnedIds && running[it] != RunningSlot.NAV }
-                    .mapNotNull { id -> entries.find { it.componentId == id } }
-                val shownPins = pinnedEntries.filter { running[it.componentId] != RunningSlot.NAV }
-                if (shownPins.isNotEmpty() || runningEntries.isNotEmpty()) NavDivider()
-                shownPins.forEach { entry -> NavEntryIcon(entry, running, navigator, frame) }
-                if (shownPins.isNotEmpty() && runningEntries.isNotEmpty()) NavDivider()
-                runningEntries.forEach { entry -> NavEntryIcon(entry, running, navigator, frame) }
-
-                // Next turn first, off the map only; the player shares the space when it fits,
-                // and gives way to the turn when it doesn't.
-                val turn = rememberNextTurn().takeIf { navigator.current != CarScreen.Home }
-                BoxWithConstraints(Modifier.weight(1f).padding(horizontal = 16.dp), contentAlignment = Alignment.Center) {
-                    val roomForBoth = maxWidth >= TURN_AND_PLAYER_MIN_WIDTH
-                    Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(10.dp)) {
-                        turn?.let { NavTurnPill(it) { navigator.home() } }
-                        if (turn == null || roomForBoth) {
-                            NavNowPlaying(navigator, selected = navigator.current == CarScreen.Media, modifier = Modifier.weight(1f, fill = false))
-                        }
-                    }
-                }
-
-                // Weather no longer has its own chip - the temperature alone (no icon, no room
-                // for one) sits where "Night"/"Day" used to, freeing a whole chip's width for the
-                // Home button above.
-                // The clock is also the notifications button: the dashboard lists them under the
-                // calendar and weather, and a dot here marks anything unread.
-                val unread by CarNotifications.unread.collectAsState()
-                NavChip(
-                    navigator.current == CarScreen.Dashboard || navigator.current is CarScreen.Notifications,
-                    { navigator.dashboard() },
-                ) {
-                    if (unread > 0) {
-                        Box(
-                            Modifier
-                                .align(Alignment.TopEnd)
-                                .offset(x = 8.dp, y = (-2).dp)
-                                .size(8.dp)
-                                .clip(CircleShape)
-                                .background(MaterialTheme.colorScheme.primary),
-                        )
-                    }
-                    Column(horizontalAlignment = Alignment.End) {
-                        Text(
-                            DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(now)),
-                            style = MaterialTheme.typography.titleMedium,
-                            fontWeight = FontWeight.SemiBold,
-                        )
-                        Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(3.dp)) {
-                            if (battery.percent >= 0) {
-                                Text(
-                                    "${battery.percent}%",
-                                    style = MaterialTheme.typography.labelMedium,
-                                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                                )
-                                if (battery.charging) {
-                                    ChargingGlyph(Modifier.size(13.dp))
-                                }
-                            }
-                            weatherData?.let { w ->
-                                Text(
-                                    "  ·  ${w.temp}°",
-                                    style = MaterialTheme.typography.labelMedium,
-                                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                                )
-                            }
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
-/**
- * Home: the map, with the player or lyrics beside it. While a map app runs, the button wears that
- * app's icon and a long press offers to close it, so the app needs no icon of its own on the bar.
- */
-@Composable
-private fun NavHomeButton(navigator: CarNavigator, entries: List<Entry>, running: Map<String, RunningSlot>) {
-    val selected = navigator.current == CarScreen.Home
-    val navId = running.entries.firstOrNull { it.value == RunningSlot.NAV }?.key
-    val navEntry = navId?.let { id -> entries.find { it.componentId == id } }
-    GsIconBox(
-        { navigator.home() },
-        colors = navColors(selected),
-        latched = selected,
-        onLongClick = navId?.let { id -> { navigator.showAppMenu(id) } },
-    ) {
-        val icon = navEntry?.icon
-        if (icon != null) {
-            Box(Modifier.padding(NAV_ITEM_PADDING).size(28.dp), contentAlignment = Alignment.Center) {
-                Image(icon, navEntry.label, Modifier.size(28.dp).clip(RoundedCornerShape(7.dp)))
-            }
-        } else {
-            Icon(
-                ImageVector.vectorResource(R.drawable.navigation_24), contentDescription = "Home",
-                modifier = Modifier.padding(NAV_ITEM_PADDING).size(28.dp),
-            )
-        }
-    }
-}
-
-/** Splits the nav bar's sections: Home and Apps, pinned apps, open apps. */
-@Composable
-private fun NavDivider() {
-    Box(
-        Modifier
-            .padding(horizontal = 10.dp)
-            .width(1.dp)
-            .height(28.dp)
-            .background(MaterialTheme.colorScheme.outlineVariant),
-    )
-}
-
-/**
- * A pinned or open app on the nav bar. Tapping brings it back without reconnecting if it's
- * already open; a long press opens its menu (pin, unpin, close).
- */
-@Composable
-private fun NavEntryIcon(
-    entry: Entry,
-    running: Map<String, RunningSlot>,
-    navigator: CarNavigator,
-    frame: CarEnvironment.Frame,
-) {
-    val id = entry.componentId ?: return
-    val slot = running[id]
-    Box(Modifier.padding(horizontal = 3.dp)) {
-        NavAppIcon(
-            entry,
-            open = slot != null,
-            showing = slot != null && slot.isShowing(navigator.current),
-            onLongClick = { navigator.showAppMenu(id) },
-        ) { openApp(entry, slot, navigator, frame) }
-    }
-}
-
-/** One open or pinned app's icon on the nav bar - the same fixed size and shape either way. */
-@Composable
-private fun NavAppIcon(
-    entry: Entry,
-    open: Boolean,
-    showing: Boolean,
-    onLongClick: () -> Unit,
-    onClick: () -> Unit,
-) {
-    val scheme = MaterialTheme.colorScheme
-    GsIconBox(
-        onClick,
-        Modifier.size(44.dp),
-        colors = if (showing) GsColors(scheme.secondaryContainer, scheme.onSecondaryContainer)
-        else GsColors(scheme.surfaceVariant, scheme.onSurfaceVariant),
-        latched = showing,
-        onLongClick = onLongClick,
-    ) {
-        entry.icon?.let { Image(it, entry.label, Modifier.size(30.dp).clip(RoundedCornerShape(8.dp))) }
-        entry.builtIn?.let { Icon(it.glyph, entry.label, Modifier.size(26.dp)) }
-        // Only running apps get the line along the bottom edge, the usual taskbar mark for it.
-        if (open) {
-            Box(
-                Modifier
-                    .align(Alignment.BottomCenter)
-                    .padding(bottom = 2.dp)
-                    .size(width = 12.dp, height = 3.dp)
-                    .clip(RoundedCornerShape(50))
-                    .background(scheme.primary),
-            )
-        }
-    }
-}
-
-/** A tappable group in the bar that stays highlighted while its screen is open, like [NavItem]. */
-@Composable
-private fun NavChip(selected: Boolean, onClick: () -> Unit, content: @Composable BoxScope.() -> Unit) {
-    GsIconBox(onClick, colors = navColors(selected), latched = selected) {
-        Box(Modifier.padding(horizontal = 10.dp, vertical = 2.dp)) { content() }
-    }
-}
-
-/** Every nav bar item is raised, so it reads as pressable; the current screen's takes the accent colour. */
-@Composable
-private fun navColors(selected: Boolean): GsColors {
-    val s = MaterialTheme.colorScheme
-    return if (selected) GsColors(s.secondaryContainer, s.onSecondaryContainer)
-    else GsColors(s.surfaceContainerHighest, s.onSurface)
-}
-
-/**
- * Between Apps and whatever's actually open, not with the clock/battery group on the right - a
- * driver reaches for it right after deciding "not a tap for this", same gesture family as the
- * two buttons beside it.
- */
-@Composable
-private fun NavAssistantIcon() {
-    val state by CarAssistant.state.collectAsState()
-    val active = state.phase != CarAssistant.Phase.IDLE
-    GsIconBox({ CarAssistant.start() }, colors = navColors(active), latched = active) {
-        MicGlyph(Modifier.padding(NAV_ITEM_PADDING).size(28.dp))
-    }
-}
-
-/** Inner padding of every icon on the nav bar, leaving each button room inside the 56dp bar. */
-private val NAV_ITEM_PADDING = 8.dp
-
-@Composable
-private fun NavItem(icon: ImageVector, selected: Boolean, onClick: () -> Unit) {
-    GsIconBox(onClick, colors = navColors(selected), latched = selected) {
-        Icon(icon, contentDescription = null, modifier = Modifier.padding(NAV_ITEM_PADDING).size(28.dp))
-    }
-}
-
-/** Wall-clock time, ticking on the minute: no reason to redraw (and re-encode) more often. */
-@Composable
-internal fun rememberNow(): State<Long> = produceState(System.currentTimeMillis()) {
-    while (true) {
-        value = System.currentTimeMillis()
-        delay(60_000 - value % 60_000)
-    }
-}
-
-/** How long the pill shows a new song's title before settling to just the controls. */
-private const val TITLE_SHOWN_MS = 3_000L
-
-/** Below this, the nav bar's middle only has room for the turn, not the player beside it. */
-private val TURN_AND_PLAYER_MIN_WIDTH = 520.dp
-
-/** The next manoeuvre, as the running nav app last described it. */
-private class NextTurn(val icon: CarIcon?, val distance: String, val road: String)
-
-/**
- * Read straight off the nav app's own template: a navigation app keeps sending its routing card
- * while it's running, whether or not the map is the screen being shown.
- */
-@Composable
-private fun rememberNextTurn(): NextTurn? {
-    val status by CarServices.nav.status.collectAsState()
-    val template by CarServices.nav.template.collectAsState()
-    // Read so a change of units redraws the distance straight away, not at the next update.
-    CarSettings.units.collectAsState().value
-    if (status.phase != CarAppConnection.Phase.RUNNING) return null
-    val routing = (template as? NavigationTemplate)?.navigationInfo as? RoutingInfo ?: return null
-    if (routing.isLoading) return null
-    val step = routing.currentStep ?: return null
-    return NextTurn(
-        icon = step.maneuver?.icon,
-        distance = routing.currentDistance.display(),
-        road = step.road.text().ifEmpty { step.cue.text() },
-    )
-}
-
-/** The next turn in the nav bar: arrow, how far, onto what. Tapping goes back to the map. */
-@Composable
-private fun NavTurnPill(turn: NextTurn, onClick: () -> Unit) {
-    // Same finish as every other button on the bar, in the accent colour; the text runs a step
-    // bigger than anything else there, since it's the one thing worth a glance mid-drive.
-    GsIconBox(
-        onClick,
-        Modifier.widthIn(max = 340.dp).height(44.dp),
-        colors = gsColors(GsTone.Primary),
-    ) {
-        Row(
-            Modifier.padding(NAV_ITEM_PADDING),
-            verticalAlignment = Alignment.CenterVertically,
-            horizontalArrangement = Arrangement.spacedBy(8.dp),
-        ) {
-            CarGlyph(turn.icon, Modifier.size(28.dp))
-            if (turn.distance.isNotEmpty()) {
-                Text(turn.distance, style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold, maxLines = 1)
-            }
-            if (turn.road.isNotEmpty()) {
-                Text(
-                    turn.road,
-                    style = MaterialTheme.typography.titleMedium,
-                    fontWeight = FontWeight.SemiBold,
-                    maxLines = 1,
-                    overflow = TextOverflow.Ellipsis,
-                )
-            }
-        }
-    }
-}
-
-/** "Title - Artist" on one line. The text itself cuts it off, and only where the pill runs out of room. */
-private fun nowPlayingLabel(title: String, artist: String): String =
-    listOf(title.trim(), artist.trim()).filter { it.isNotEmpty() }.joinToString(" - ")
-        .ifEmpty { "Nothing playing" }
-
-/**
- * The player in the nav bar, on every screen. Art and title open the full media screen;
- * play/pause and skip work right here. The dock button moves the player into the column beside
- * the map on Home (see [CarHome]), and the pill steps aside there while it's docked - unless the
- * column is showing lyrics instead, when the pill stays and its dock button swaps them back.
- */
-@Composable
-private fun NavNowPlaying(navigator: CarNavigator, selected: Boolean, modifier: Modifier = Modifier) {
-    val media = CarServices.media
-    val phase by media.phase.collectAsState()
-    val now by media.now.collectAsState()
-    if (phase != CarMedia.Phase.READY || !now.isActive) return
-    // Docked beside the map, the player is already on screen - the pill steps aside for it.
-    if (navigator.sidePanel == SidePanel.CONTROLS && navigator.current == CarScreen.Home) return
-    // The media screen is the full player already; the pill would only repeat its controls.
-    if (navigator.current == CarScreen.Media) return
-    val context = LocalContext.current
-    val art by produceState(now.art, now.art, now.artUri) { value = now.art ?: MediaArt.load(context, now.artUri) }
-    val position by produceState(now.currentPosition(), now) {
-        while (true) {
-            value = now.currentPosition()
-            if (!now.playing) break
-            delay(1000)
-        }
-    }
-
-    // A new song announces itself: title, play/pause and dock for a few seconds, then the title
-    // goes and the pill settles to just the controls - unless the driver keeps the title up.
-    val keepTitle by CarSettings.playerTitle.collectAsState()
-    var announcing by remember { mutableStateOf(true) }
-    LaunchedEffect(now.title, now.artist) {
-        announcing = true
-        delay(TITLE_SHOWN_MS)
-        announcing = false
-    }
-    val showTitle = keepTitle || announcing
-
-    val scheme = MaterialTheme.colorScheme
-    val onPill = if (selected) scheme.onPrimaryContainer else scheme.onSecondaryContainer
-    Surface(
-        modifier = modifier
-            .animateContentSize()
-            // With the title up, all the room the bar has, so as much of it shows as can.
-            .then(if (showTitle) Modifier.fillMaxWidth() else Modifier)
-            .height(44.dp),
-        shape = RoundedCornerShape(14.dp),
-        color = if (selected) scheme.primaryContainer else scheme.secondaryContainer,
-        contentColor = onPill,
-    ) {
-        Box {
-            Row(
-                Modifier.fillMaxHeight().padding(horizontal = 4.dp),
-                verticalAlignment = Alignment.CenterVertically,
-                horizontalArrangement = Arrangement.spacedBy(6.dp),
-            ) {
-                // Art (and the title while it shows) opens the full media screen.
-                Row(
-                    Modifier
-                        .then(if (showTitle) Modifier.weight(1f) else Modifier)
-                        .fillMaxHeight()
-                        .clip(RoundedCornerShape(10.dp))
-                        .clickable { navigator.media() },
-                    verticalAlignment = Alignment.CenterVertically,
-                    horizontalArrangement = Arrangement.spacedBy(8.dp),
-                ) {
-                    Box(Modifier.size(34.dp).clip(RoundedCornerShape(8.dp)).background(scheme.surfaceVariant)) {
-                        art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
-                    }
-                    if (showTitle) {
-                        Text(
-                            nowPlayingLabel(now.title, now.artist),
-                            style = MaterialTheme.typography.titleSmall,
-                            fontWeight = FontWeight.SemiBold,
-                            maxLines = 1,
-                            overflow = TextOverflow.Ellipsis,
-                        )
-                    }
-                }
-                if (!showTitle) {
-                    GsIconButton(
-                        MediaIcons.Previous, "Previous", media::previous,
-                        enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_PREVIOUS), size = 36.dp, iconSize = 22.dp,
-                    )
-                }
-                GsIconButton(
-                    if (now.playing) MediaIcons.Pause else Icons.Filled.PlayArrow,
-                    if (now.playing) "Pause" else "Play",
-                    media::togglePlay,
-                    tone = GsTone.Primary, size = 36.dp, iconSize = 22.dp,
-                )
-                if (!showTitle) {
-                    GsIconButton(
-                        MediaIcons.Next, "Next", media::next,
-                        enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_NEXT), size = 36.dp, iconSize = 22.dp,
-                    )
-                }
-                GsIconButton(
-                    MediaIcons.DockRight, "Move the player beside the map", navigator::togglePlayerDock,
-                    size = 36.dp, iconSize = 22.dp,
-                )
-            }
-            if (now.durationMs > 0) {
-                // matchParentSize, so the line follows the pill's width rather than widening it.
-                Box(Modifier.matchParentSize(), contentAlignment = Alignment.BottomStart) {
-                    Box(
-                        Modifier
-                            .fillMaxWidth((position.toFloat() / now.durationMs).coerceIn(0f, 1f))
-                            .height(2.dp)
-                            .background(onPill.copy(alpha = 0.7f)),
-                    )
-                }
-            }
-        }
-    }
-}
-
-/**
- * A filled lightning bolt, next to the battery percentage instead of the word "charging" - the
- * core Material icon set this project ships (no extended pack, to keep the app small) has no
- * bolt, so this is drawn rather than a vector asset.
- */
-@Composable
-private fun ChargingGlyph(modifier: Modifier = Modifier, tint: Color = MaterialTheme.colorScheme.onSurfaceVariant) {
-    androidx.compose.foundation.Canvas(modifier) {
-        val w = size.width
-        val h = size.height
-        val bolt = androidx.compose.ui.graphics.Path().apply {
-            moveTo(w * 0.58f, 0f)
-            lineTo(w * 0.12f, h * 0.58f)
-            lineTo(w * 0.46f, h * 0.58f)
-            lineTo(w * 0.42f, h)
-            lineTo(w * 0.88f, h * 0.40f)
-            lineTo(w * 0.54f, h * 0.40f)
-            close()
-        }
-        drawPath(bolt, tint)
-    }
-}
-
 /** Stands in for the phone's vibration motor on the car screen: does nothing. */
 private object NoHaptics : HapticFeedback {
     override fun performHapticFeedback(hapticFeedbackType: HapticFeedbackType) {}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/CarWhatsNew.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
@@ -76,7 +78,7 @@ fun CarWhatsNew() {
         ) {
             Column(Modifier.padding(20.dp), verticalArrangement = Arrangement.spacedBy(14.dp)) {
                 Text(
-                    "What's new in ${release.versionName}",
+                    stringResource(R.string.whatsnew_title, release.versionName),
                     style = MaterialTheme.typography.headlineSmall,
                     fontWeight = FontWeight.Bold,
                 )
@@ -99,12 +101,12 @@ fun CarWhatsNew() {
                 Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(14.dp)) {
                     GsSwitch(afterUpdates, CarSettings::setWhatsNewAfterUpdates)
                     Text(
-                        "Show after updates",
+                        stringResource(R.string.whatsnew_show_after),
                         style = MaterialTheme.typography.titleMedium,
                         modifier = Modifier.weight(1f),
                     )
                     GsButton(onClick = close, modifier = Modifier.height(56.dp)) {
-                        Text("Got it", style = MaterialTheme.typography.titleMedium)
+                        Text(stringResource(R.string.whatsnew_got_it), style = MaterialTheme.typography.titleMedium)
                     }
                 }
             }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/ClusterNav.kt

@@ -8,6 +8,7 @@ import androidx.car.app.navigation.model.RoutingInfo
 import androidx.car.app.navigation.model.Step
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.Protobuf
+import app.seb3thehacker.gearslip.notify.PhoneNavigation
 
 /**
  * The next turn on the car's instrument cluster, over its NavigationStatusService (Service
@@ -24,23 +25,36 @@ import app.seb3thehacker.gearslip.Protobuf
  */
 class ClusterNav(
     val channelId: Int,
+    minimumIntervalMs: Long = 0,
     private val sendOnChannel: (messageId: Int, body: ByteArray) -> Unit,
 ) {
+    private val updateIntervalMs = maxOf(TICK_MS, minimumIntervalMs)
     @Volatile private var running = false
+    private var worker: Thread? = null
+    private var updatesRequested = true
     private var sentStatus = -1
     private var sentTurn: String? = null
     private var sentDistance: String? = null
 
+    @Synchronized
     fun onMessage(messageId: Int, body: ByteArray) {
         when (messageId) {
             MSG_CHANNEL_OPEN_RESPONSE -> {
-                val status = Protobuf.readInt32Field(body, 1) ?: 0
+                val status = Protobuf.readInt32Field(body, 1)
                 GearslipLog.i("cluster: <- ChannelOpenResponse: status=$status")
                 if (status == 0) start()
             }
-            // The car saying when it wants turns. Sending all along is harmless, so these are only logged.
-            MSG_START -> GearslipLog.i("cluster: <- start")
-            MSG_STOP -> GearslipLog.i("cluster: <- stop")
+            MSG_START -> {
+                updatesRequested = true
+                sentStatus = -1
+                sentTurn = null
+                sentDistance = null
+                GearslipLog.i("cluster: <- start")
+            }
+            MSG_STOP -> {
+                updatesRequested = false
+                GearslipLog.i("cluster: <- stop")
+            }
             else -> GearslipLog.i("cluster: <- unhandled message id=$messageId (${body.size} bytes)")
         }
     }
@@ -48,19 +62,28 @@ class ClusterNav(
     private fun start() {
         if (running) return
         running = true
-        Thread({
+        worker = Thread({
             while (running) {
                 runCatching { tick() }.onFailure { GearslipLog.w("cluster: ${it.message}") }
-                Thread.sleep(TICK_MS)
+                try {
+                    Thread.sleep(updateIntervalMs)
+                } catch (_: InterruptedException) {
+                    return@Thread
+                }
             }
-        }, "gearslip-cluster").start()
+        }, "gearslip-cluster").also { it.start() }
     }
 
+    @Synchronized
     fun stop() {
         running = false
+        worker?.interrupt()
+        worker = null
     }
 
+    @Synchronized
     private fun tick() {
+        if (!running || !updatesRequested) return
         val turn = NavTurn.current()
         val status = when {
             turn == null -> STATUS_INACTIVE
@@ -82,7 +105,7 @@ class ClusterNav(
         val maneuver = step.maneuver
         val (event, side) = maneuver?.let { eventFor(it.type) } ?: (EVENT_UNKNOWN to SIDE_UNSPECIFIED)
         val road = step.road.text().ifBlank { step.cue.text() }
-        val key = "$road|$event|$side|${maneuver?.roundaboutExitNumber}"
+        val key = "$road|$event|$side|${maneuver?.roundaboutExitNumber}|${maneuver?.roundaboutExitAngle}"
         if (key == sentTurn) return
         sentTurn = key
         var body = Protobuf.stringField(1, road) +
@@ -178,6 +201,14 @@ internal class NavTurn(val step: Step, val distance: Distance?, val seconds: Lon
         /** The map app's next turn: from its trip (what clusters get), or its routing card. */
         fun current(): NavTurn? {
             val nav = CarServices.navOrNull() ?: return null
+            hosted(nav)?.let { return it }
+            // Google Maps or Waze guiding on the phone, when no map in the car is.
+            val phone = PhoneNavigation.turn.value ?: return null
+            val step = Step.Builder(phone.road).setManeuver(Maneuver.Builder(phone.maneuver).build()).build()
+            return NavTurn(step, phone.distance, null, false)
+        }
+
+        private fun hosted(nav: app.seb3thehacker.gearslip.host.CarAppConnection): NavTurn? {
             nav.trip.value?.let { trip ->
                 val step = trip.steps.firstOrNull() ?: return@let
                 val estimate = trip.stepTravelEstimates.firstOrNull()

gearslip/src/main/java/app/seb3thehacker/gearslip/car/ClusterScreen.kt

@@ -0,0 +1,140 @@
+package app.seb3thehacker.gearslip.car
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.LocalContentColor
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.produceState
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import app.seb3thehacker.gearslip.host.clockTime
+import app.seb3thehacker.gearslip.host.display
+import app.seb3thehacker.gearslip.host.remainingTime
+import kotlinx.coroutines.delay
+
+/**
+ * The instrument-cluster screen: the next turn, big enough to read in a glance past the wheel.
+ * The arrow and the distance to it, what to do there, and the time, distance and arrival left
+ * along the bottom. With no route it shows what's playing, quietly, or nothing.
+ *
+ * Always dark, like the dials around it. [marginX] and [marginY] are the pixels the car crops off
+ * the frame, kept clear.
+ */
+@Composable
+internal fun ClusterScreen(marginX: Int, marginY: Int) {
+    // The map app's turn changes a few times a minute: read it once a second.
+    val turn by produceState<ClusterTurn?>(null) {
+        while (true) {
+            value = ClusterTurn.now()
+            delay(1_000)
+        }
+    }
+    val density = LocalDensity.current
+    MaterialTheme(colorScheme = darkColorScheme()) {
+        CompositionLocalProvider(LocalContentColor provides Color.White) {
+            BoxWithConstraints(
+                Modifier.fillMaxSize().background(Color.Black).padding(
+                    horizontal = with(density) { (marginX / 2).toDp() } + 24.dp,
+                    vertical = with(density) { (marginY / 2).toDp() } + 16.dp,
+                ),
+                contentAlignment = Alignment.CenterStart,
+            ) {
+                // Sized off the height: clusters run from short strips to near squares.
+                val unit = maxHeight / 12
+                val t = turn
+                if (t == null) {
+                    NowPlayingLine(Modifier.align(Alignment.Center))
+                    return@BoxWithConstraints
+                }
+                Column(verticalArrangement = Arrangement.spacedBy(unit * 0.4f)) {
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        CarGlyph(t.icon, Modifier.size(unit * 3.4f))
+                        Spacer(Modifier.width(unit))
+                        Text(
+                            t.distance,
+                            fontSize = with(density) { (unit * 2.2f).toSp() },
+                            fontWeight = FontWeight.Bold,
+                            maxLines = 1,
+                        )
+                    }
+                    if (t.what.isNotEmpty()) {
+                        Text(
+                            t.what,
+                            fontSize = with(density) { (unit * 1.1f).toSp() },
+                            fontWeight = FontWeight.SemiBold,
+                            maxLines = 2,
+                            overflow = TextOverflow.Ellipsis,
+                        )
+                    }
+                    if (t.trip.isNotEmpty()) {
+                        Text(
+                            t.trip,
+                            fontSize = with(density) { (unit * 0.85f).toSp() },
+                            color = Color.White.copy(alpha = 0.7f),
+                            maxLines = 1,
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun NowPlayingLine(modifier: Modifier) {
+    val now = CarServices.mediaOrNull()?.now?.value
+    if (now == null || now.title.isEmpty()) return
+    Text(
+        listOf(now.title, now.artist).filter { it.isNotEmpty() }.joinToString(" · "),
+        modifier,
+        style = MaterialTheme.typography.titleLarge,
+        color = Color.White.copy(alpha = 0.7f),
+        maxLines = 1,
+        overflow = TextOverflow.Ellipsis,
+    )
+}
+
+/** What the cluster shows of a route, read from [NavTurn] and the trip's estimate to the destination. */
+private class ClusterTurn(
+    val icon: androidx.car.app.model.CarIcon?,
+    val distance: String,
+    val what: String,
+    val trip: String,
+) {
+    companion object {
+        fun now(): ClusterTurn? {
+            val turn = NavTurn.current() ?: return null
+            if (turn.rerouting) return null
+            val step = turn.step
+            val cue = step.cue?.toString().orEmpty()
+            val what = cue.ifEmpty { step.road?.toString().orEmpty() }
+            val estimate = CarServices.navOrNull()?.trip?.value?.destinationTravelEstimates?.firstOrNull()
+            val trip = estimate?.let { e ->
+                listOf(
+                    e.remainingTimeSeconds.takeIf { it >= 0 }?.let { remainingTime(it) }.orEmpty(),
+                    e.remainingDistance.display(),
+                    e.arrivalTimeAtDestination.clockTime(),
+                ).filter { it.isNotEmpty() }.joinToString(" · ")
+            }.orEmpty()
+            return ClusterTurn(step.maneuver?.icon, turn.distance.display(), what, trip)
+        }
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/DirectionsVoice.kt

@@ -1,7 +1,11 @@
 package app.seb3thehacker.gearslip.car
 
+import app.seb3thehacker.gearslip.R
 import android.content.Context
 import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
+import android.os.SystemClock
 import android.speech.tts.TextToSpeech
 import android.speech.tts.UtteranceProgressListener
 import androidx.car.app.model.CarText
@@ -10,6 +14,7 @@ import androidx.car.app.navigation.model.Maneuver
 import androidx.car.app.navigation.model.Step
 import app.seb3thehacker.gearslip.GearslipLog
 import app.seb3thehacker.gearslip.audio.AudioLink
+import app.seb3thehacker.gearslip.audio.CarAudio
 import java.io.File
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
@@ -27,7 +32,8 @@ import kotlin.math.roundToInt
  * same turn the instrument cluster gets ([NavTurn]) and says it itself: once when the turn comes
  * up, again a kilometre or so out on a long stretch, and once more just before it. The words are
  * rendered with the phone's text-to-speech to a file, never played on the phone, and streamed to
- * the car, which ducks the music under them the way it does for real Android Auto.
+ * the car, which ducks the music under them the way it does for real Android Auto. When the music
+ * isn't Gearslip's, each announcement first asks the car for its speakers, as Android Auto does.
  *
  * Nothing spoken is logged: road names are where the driver is going.
  */
@@ -38,11 +44,19 @@ object DirectionsVoice {
     private var appContext: Context? = null
     private var tts: TextToSpeech? = null
     @Volatile private var ttsReady = false
+    /** When the engine was last started; one not ready by [RESTART_MS] later gets another try. */
+    @Volatile private var ttsStartedAt = 0L
     private val pending = ConcurrentHashMap<String, CountDownLatch>()
+    private val main = Handler(Looper.getMainLooper())
 
     @Volatile private var link: AudioLink? = null
     @Volatile private var running = false
-    private val speaker = Executors.newSingleThreadExecutor { Thread(it, "gearslip-directions").apply { isDaemon = true } }
+    @Volatile private var musicIsOurs: () -> Boolean = { false }
+    /** The car's music sink once it's set up, for [CarSettings.directionsOverMusic]. */
+    @Volatile private var musicSink: () -> AudioLink? = { null }
+    private val speaker = Executors.newSingleThreadScheduledExecutor { Thread(it, "gearslip-directions").apply { isDaemon = true } }
+    /** Counts announcements, so a hand-back scheduled after one is dropped if another has begun. */
+    private var spoken = 0
     @Volatile private var latest = 0
 
     private var turnKey: String? = null
@@ -51,7 +65,19 @@ object DirectionsVoice {
     fun init(context: Context) {
         if (tts != null) return
         appContext = context.applicationContext
-        tts = TextToSpeech(appContext) { status -> ttsReady = status == TextToSpeech.SUCCESS }.apply {
+        start()
+    }
+
+    private fun start() {
+        ttsReady = false
+        ttsStartedAt = SystemClock.elapsedRealtime()
+        tts = TextToSpeech(appContext) { status ->
+            ttsReady = status == TextToSpeech.SUCCESS
+            if (!ttsReady) GearslipLog.w("guidance: text-to-speech didn't start (status $status)")
+            // The turns are worded in Gearslip's language; the engine's default voice may be
+            // another one, and read German words with an English voice (issue #70).
+            else speakIn(appContext?.resources?.configuration?.locales?.get(0))
+        }.apply {
             setOnUtteranceProgressListener(object : UtteranceProgressListener() {
                 override fun onStart(utteranceId: String?) {}
                 override fun onDone(utteranceId: String?) { pending.remove(utteranceId)?.countDown() }
@@ -61,9 +87,21 @@ object DirectionsVoice {
         }
     }
 
+    /** Keeps the engine's own voice when it has none for [locale]. */
+    private fun speakIn(locale: java.util.Locale?) {
+        val engine = tts ?: return
+        locale ?: return
+        val result = engine.setLanguage(locale)
+        if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {
+            GearslipLog.w("guidance: the speech engine has no ${locale.displayLanguage} voice - using its default")
+        }
+    }
+
     /** The car opened its directions sink: start following the map app's turns. */
-    fun attach(link: AudioLink) {
+    fun attach(link: AudioLink, musicIsOurs: () -> Boolean, musicSink: () -> AudioLink? = { null }) {
         this.link = link
+        this.musicIsOurs = musicIsOurs
+        this.musicSink = musicSink
         GearslipLog.i("guidance: the car offered a directions sink at ${link.sampleRate}Hz x${link.channels}")
         if (running) return
         running = true
@@ -82,16 +120,26 @@ object DirectionsVoice {
         running = false
     }
 
+    /** Why the last turn wasn't spoken, so the log says it once rather than every tick. */
+    private var silentBecause: String? = null
+
+    private fun quiet(reason: String) {
+        if (silentBecause == reason) return
+        silentBecause = reason
+        GearslipLog.i("guidance: not speaking - $reason")
+    }
+
     private fun tick() {
-        if (!CarSettings.speakDirections.value) return
         val turn = NavTurn.current()
         if (turn == null) {
             turnKey = null
             return
         }
-        if (turn.rerouting) return
+        if (!CarSettings.speakDirections.value) return quiet("Spoken directions is off in the car's Settings")
+        if (turn.rerouting) return quiet("the map app is rerouting")
         val step = turn.step
-        val instruction = instruction(step) ?: return
+        val instruction = instruction(step) ?: return quiet("the map app gave this turn no words")
+        silentBecause = null
         val meters = turn.distance?.let(NavTurn::toMeters)
         val close = (turn.seconds != null && turn.seconds <= NEAR_SECONDS) || (meters != null && meters <= NEAR_METERS)
 
@@ -106,7 +154,7 @@ object DirectionsVoice {
                 say(instruction)
                 stage = Stage.DONE
             } else {
-                say("In ${spoken(turn.distance)}, $instruction")
+                say(ahead(turn.distance, instruction))
                 stage = if (meters != null && meters > PREPARE_FROM_METERS) Stage.FAR else Stage.PREPARED
             }
             return
@@ -117,7 +165,7 @@ object DirectionsVoice {
                 stage = Stage.DONE
             }
             stage == Stage.FAR && meters != null && meters <= PREPARE_AT_METERS -> {
-                say("In ${spoken(turn.distance)}, $instruction")
+                say(ahead(turn.distance, instruction))
                 stage = Stage.PREPARED
             }
         }
@@ -125,67 +173,79 @@ object DirectionsVoice {
 
     /** What to do, in words: built from the manoeuvre when the app names one, else the app's own text. */
     private fun instruction(step: Step): String? {
+        val res = appContext?.resources ?: return null
         val road = step.road.text()
-        val onto = if (road.isBlank()) "" else " onto $road"
-        val toward = if (road.isBlank()) "" else " toward $road"
+        // Each manoeuvre is a whole sentence, with and without the road, so a translation can
+        // put the road wherever its language wants it.
+        fun say(plain: Int, withRoad: Int) =
+            if (road.isBlank() || withRoad == 0) res.getString(plain) else res.getString(withRoad, road)
         val maneuver = step.maneuver
         val built = when (maneuver?.type) {
-            Maneuver.TYPE_TURN_SLIGHT_LEFT -> "Turn slightly left$onto"
-            Maneuver.TYPE_TURN_SLIGHT_RIGHT -> "Turn slightly right$onto"
-            Maneuver.TYPE_TURN_NORMAL_LEFT -> "Turn left$onto"
-            Maneuver.TYPE_TURN_NORMAL_RIGHT -> "Turn right$onto"
-            Maneuver.TYPE_TURN_SHARP_LEFT -> "Turn sharply left$onto"
-            Maneuver.TYPE_TURN_SHARP_RIGHT -> "Turn sharply right$onto"
-            Maneuver.TYPE_U_TURN_LEFT, Maneuver.TYPE_U_TURN_RIGHT -> "Make a U-turn"
-            Maneuver.TYPE_KEEP_LEFT -> "Keep left$toward"
-            Maneuver.TYPE_KEEP_RIGHT -> "Keep right$toward"
-            Maneuver.TYPE_FORK_LEFT -> "Keep left at the fork$toward"
-            Maneuver.TYPE_FORK_RIGHT -> "Keep right at the fork$toward"
+            Maneuver.TYPE_TURN_SLIGHT_LEFT -> say(R.string.dir_slight_left, R.string.dir_slight_left_onto)
+            Maneuver.TYPE_TURN_SLIGHT_RIGHT -> say(R.string.dir_slight_right, R.string.dir_slight_right_onto)
+            Maneuver.TYPE_TURN_NORMAL_LEFT -> say(R.string.dir_left, R.string.dir_left_onto)
+            Maneuver.TYPE_TURN_NORMAL_RIGHT -> say(R.string.dir_right, R.string.dir_right_onto)
+            Maneuver.TYPE_TURN_SHARP_LEFT -> say(R.string.dir_sharp_left, R.string.dir_sharp_left_onto)
+            Maneuver.TYPE_TURN_SHARP_RIGHT -> say(R.string.dir_sharp_right, R.string.dir_sharp_right_onto)
+            Maneuver.TYPE_U_TURN_LEFT, Maneuver.TYPE_U_TURN_RIGHT -> say(R.string.dir_u_turn, 0)
+            Maneuver.TYPE_KEEP_LEFT -> say(R.string.dir_keep_left, R.string.dir_keep_left_toward)
+            Maneuver.TYPE_KEEP_RIGHT -> say(R.string.dir_keep_right, R.string.dir_keep_right_toward)
+            Maneuver.TYPE_FORK_LEFT -> say(R.string.dir_fork_left, R.string.dir_fork_left_toward)
+            Maneuver.TYPE_FORK_RIGHT -> say(R.string.dir_fork_right, R.string.dir_fork_right_toward)
             Maneuver.TYPE_ON_RAMP_SLIGHT_LEFT, Maneuver.TYPE_ON_RAMP_NORMAL_LEFT, Maneuver.TYPE_ON_RAMP_SHARP_LEFT,
-            Maneuver.TYPE_ON_RAMP_U_TURN_LEFT -> "Take the ramp on the left$onto"
+            Maneuver.TYPE_ON_RAMP_U_TURN_LEFT -> say(R.string.dir_ramp_left, R.string.dir_ramp_left_onto)
             Maneuver.TYPE_ON_RAMP_SLIGHT_RIGHT, Maneuver.TYPE_ON_RAMP_NORMAL_RIGHT, Maneuver.TYPE_ON_RAMP_SHARP_RIGHT,
-            Maneuver.TYPE_ON_RAMP_U_TURN_RIGHT -> "Take the ramp on the right$onto"
-            Maneuver.TYPE_OFF_RAMP_SLIGHT_LEFT, Maneuver.TYPE_OFF_RAMP_NORMAL_LEFT -> "Take the exit on the left$toward"
-            Maneuver.TYPE_OFF_RAMP_SLIGHT_RIGHT, Maneuver.TYPE_OFF_RAMP_NORMAL_RIGHT -> "Take the exit on the right$toward"
-            Maneuver.TYPE_MERGE_LEFT -> "Merge left$onto"
-            Maneuver.TYPE_MERGE_RIGHT -> "Merge right$onto"
-            Maneuver.TYPE_MERGE_SIDE_UNSPECIFIED -> "Merge$onto"
+            Maneuver.TYPE_ON_RAMP_U_TURN_RIGHT -> say(R.string.dir_ramp_right, R.string.dir_ramp_right_onto)
+            Maneuver.TYPE_OFF_RAMP_SLIGHT_LEFT, Maneuver.TYPE_OFF_RAMP_NORMAL_LEFT -> say(R.string.dir_exit_left, R.string.dir_exit_left_toward)
+            Maneuver.TYPE_OFF_RAMP_SLIGHT_RIGHT, Maneuver.TYPE_OFF_RAMP_NORMAL_RIGHT -> say(R.string.dir_exit_right, R.string.dir_exit_right_toward)
+            Maneuver.TYPE_MERGE_LEFT -> say(R.string.dir_merge_left, R.string.dir_merge_left_onto)
+            Maneuver.TYPE_MERGE_RIGHT -> say(R.string.dir_merge_right, R.string.dir_merge_right_onto)
+            Maneuver.TYPE_MERGE_SIDE_UNSPECIFIED -> say(R.string.dir_merge, R.string.dir_merge_onto)
             Maneuver.TYPE_ROUNDABOUT_ENTER_AND_EXIT_CW, Maneuver.TYPE_ROUNDABOUT_ENTER_AND_EXIT_CW_WITH_ANGLE,
             Maneuver.TYPE_ROUNDABOUT_ENTER_AND_EXIT_CCW, Maneuver.TYPE_ROUNDABOUT_ENTER_AND_EXIT_CCW_WITH_ANGLE ->
                 maneuver.roundaboutExitNumber.takeIf { it in 1..ORDINALS.size }
-                    ?.let { "At the roundabout, take the ${ORDINALS[it - 1]} exit$onto" }
-                    ?: "Go through the roundabout$onto"
-            Maneuver.TYPE_ROUNDABOUT_ENTER_CW, Maneuver.TYPE_ROUNDABOUT_ENTER_CCW -> "Enter the roundabout"
-            Maneuver.TYPE_ROUNDABOUT_EXIT_CW, Maneuver.TYPE_ROUNDABOUT_EXIT_CCW -> "Exit the roundabout$onto"
-            Maneuver.TYPE_STRAIGHT -> "Continue straight$onto"
-            Maneuver.TYPE_NAME_CHANGE -> "Continue$onto"
-            Maneuver.TYPE_FERRY_BOAT, Maneuver.TYPE_FERRY_BOAT_LEFT, Maneuver.TYPE_FERRY_BOAT_RIGHT -> "Take the ferry"
-            Maneuver.TYPE_FERRY_TRAIN, Maneuver.TYPE_FERRY_TRAIN_LEFT, Maneuver.TYPE_FERRY_TRAIN_RIGHT -> "Take the train"
-            Maneuver.TYPE_DESTINATION, Maneuver.TYPE_DESTINATION_STRAIGHT -> "Your destination is ahead"
-            Maneuver.TYPE_DESTINATION_LEFT -> "Your destination is on the left"
-            Maneuver.TYPE_DESTINATION_RIGHT -> "Your destination is on the right"
+                    ?.let { res.getString(ORDINALS[it - 1]) }
+                    ?.let { exit ->
+                        if (road.isBlank()) res.getString(R.string.dir_roundabout_take, exit)
+                        else res.getString(R.string.dir_roundabout_take_onto, exit, road)
+                    }
+                    ?: say(R.string.dir_roundabout_through, R.string.dir_roundabout_through_onto)
+            Maneuver.TYPE_ROUNDABOUT_ENTER_CW, Maneuver.TYPE_ROUNDABOUT_ENTER_CCW -> say(R.string.dir_roundabout_enter, 0)
+            Maneuver.TYPE_ROUNDABOUT_EXIT_CW, Maneuver.TYPE_ROUNDABOUT_EXIT_CCW -> say(R.string.dir_roundabout_exit, R.string.dir_roundabout_exit_onto)
+            Maneuver.TYPE_STRAIGHT -> say(R.string.dir_straight, R.string.dir_straight_onto)
+            Maneuver.TYPE_NAME_CHANGE -> say(R.string.dir_continue, R.string.dir_continue_onto)
+            Maneuver.TYPE_FERRY_BOAT, Maneuver.TYPE_FERRY_BOAT_LEFT, Maneuver.TYPE_FERRY_BOAT_RIGHT -> say(R.string.dir_ferry, 0)
+            Maneuver.TYPE_FERRY_TRAIN, Maneuver.TYPE_FERRY_TRAIN_LEFT, Maneuver.TYPE_FERRY_TRAIN_RIGHT -> say(R.string.dir_train, 0)
+            Maneuver.TYPE_DESTINATION, Maneuver.TYPE_DESTINATION_STRAIGHT -> say(R.string.dir_destination, 0)
+            Maneuver.TYPE_DESTINATION_LEFT -> say(R.string.dir_destination_left, 0)
+            Maneuver.TYPE_DESTINATION_RIGHT -> say(R.string.dir_destination_right, 0)
             else -> null
         }
         return built ?: step.cue.text().ifBlank { null }
     }
 
+    /** "In 300 meters, turn left": the distance ahead of a turn that isn't close yet. */
+    private fun ahead(d: Distance, instruction: String): String =
+        appContext?.getString(R.string.dir_in_distance, spoken(d), instruction) ?: instruction
+
     /** The app's own rounded distance, read the way a person would say it. */
     private fun spoken(d: Distance): String {
+        val res = appContext?.resources ?: return ""
         val n = d.displayDistance
-        val number = if (n % 1.0 == 0.0) n.toInt().toString() else "%.1f".format(n)
-        val one = n == 1.0
+        val whole = n % 1.0 == 0.0
+        val number = if (whole) n.toInt().toString() else "%.1f".format(n)
         return when (d.displayUnit) {
-            Distance.UNIT_KILOMETERS, Distance.UNIT_KILOMETERS_P1 -> if (one) "1 kilometer" else "$number kilometers"
+            Distance.UNIT_KILOMETERS, Distance.UNIT_KILOMETERS_P1 ->
+                if (whole) res.getQuantityString(R.plurals.dir_km, n.toInt(), number) else res.getString(R.string.dir_km_decimal, number)
             Distance.UNIT_MILES, Distance.UNIT_MILES_P1 -> when (n) {
-                0.25 -> "a quarter mile"
-                0.5 -> "half a mile"
-                0.75 -> "three quarters of a mile"
-                1.0 -> "1 mile"
-                else -> "$number miles"
+                0.25 -> res.getString(R.string.dir_quarter_mile)
+                0.5 -> res.getString(R.string.dir_half_mile)
+                0.75 -> res.getString(R.string.dir_three_quarter_mile)
+                else -> if (whole) res.getQuantityString(R.plurals.dir_miles, n.toInt(), number) else res.getString(R.string.dir_miles_decimal, number)
             }
-            Distance.UNIT_FEET -> "$number feet"
-            Distance.UNIT_YARDS -> "$number yards"
-            else -> "${n.roundToInt()} meters"
+            Distance.UNIT_FEET -> res.getQuantityString(R.plurals.dir_feet, n.toInt(), number)
+            Distance.UNIT_YARDS -> res.getQuantityString(R.plurals.dir_yards, n.toInt(), number)
+            else -> res.getQuantityString(R.plurals.dir_meters, n.roundToInt(), n.roundToInt())
         }
     }
 
@@ -204,6 +264,16 @@ object DirectionsVoice {
         val sink = link ?: return
         if (!ttsReady) {
             GearslipLog.w("guidance: text-to-speech isn't ready, a turn went unspoken")
+            // A failed or unanswered start was final, so one bad start silenced a whole drive
+            // (issue #35). Try again, once the last try has had its time.
+            if (SystemClock.elapsedRealtime() - ttsStartedAt > RESTART_MS) {
+                ttsStartedAt = SystemClock.elapsedRealtime()
+                GearslipLog.i("guidance: starting text-to-speech again")
+                main.post {
+                    runCatching { engine.shutdown() }
+                    start()
+                }
+            }
             return
         }
         val file = File(context.cacheDir, "directions.wav")
@@ -219,26 +289,67 @@ object DirectionsVoice {
             GearslipLog.w("guidance: text-to-speech took too long, a turn went unspoken")
             return
         }
-        val pcm = Wav.read(file)?.let { Wav.convert(it, sink.sampleRate, sink.channels) } ?: run {
+        val wav = Wav.read(file) ?: run {
             GearslipLog.w("guidance: text-to-speech gave audio Gearslip can't read")
             return
         }
-        stream(sink, pcm)
+        val music = musicSink()
+        if (CarSettings.directionsOverMusic.value && music != null) {
+            speakOverMusic(music, Wav.convert(wav, music.sampleRate, music.channels))
+            return
+        }
+        val pcm = Wav.convert(wav, sink.sampleRate, sink.channels)
+        // Logged before speaking too, so a car that dies mid-announcement shows what it was doing.
+        GearslipLog.i("guidance: speaking a turn")
+        // Held through back-to-back prompts rather than asked for and given back each time.
+        if (!musicIsOurs()) sink.askForSpeakers()
+        val turn = ++spoken
+        try {
+            stream(sink, pcm)
+        } finally {
+            speaker.schedule({ if (turn == spoken) sink.handBackSpeakers() }, HOLD_MS, TimeUnit.MILLISECONDS)
+        }
         GearslipLog.i("guidance: spoke a turn (${pcm.size / (2 * sink.channels) * 1000 / sink.sampleRate} ms)")
     }
 
+    /**
+     * A 2025 Nissan's Bosch unit drops the link about a second after any turn on its directions
+     * channel while its music channel is open, and plays music through nothing else (issue #35).
+     * So the directions channel is left alone: the turn rides in the music, or, with no music
+     * playing, goes out on the music channel by itself.
+     */
+    private fun speakOverMusic(music: AudioLink, pcm: ByteArray) {
+        GearslipLog.i("guidance: speaking a turn over the music channel")
+        if (!CarAudio.speakOverMusic(pcm)) {
+            music.startForTurn()
+            try {
+                stream(music, pcm, alive = { musicSink() === music }, startAndStop = false)
+            } finally {
+                music.stopForTurn()
+                // Music that started during the turn found the stream running and didn't start its own.
+                if (CarAudio.capture.value == CarAudio.Capture.ON) music.start()
+            }
+        }
+        GearslipLog.i("guidance: spoke a turn over the music channel (${pcm.size / (2 * music.channels) * 1000 / music.sampleRate} ms)")
+    }
+
     /** Start, the words in 20 ms chunks at about real time, a little silence, Stop. */
-    private fun stream(sink: AudioLink, pcm: ByteArray) {
+    private fun stream(
+        sink: AudioLink,
+        pcm: ByteArray,
+        alive: () -> Boolean = { link === sink },
+        startAndStop: Boolean = true,
+    ) {
         val frame = 2 * sink.channels
         val chunk = sink.sampleRate / 50 * frame
         val chunkMs = 20L
         val padded = pcm + ByteArray(sink.sampleRate / 5 * frame) // 200 ms tail so the last word isn't clipped
-        sink.start()
+        if (startAndStop) sink.start()
         try {
             val began = System.currentTimeMillis()
             var offset = 0
             var sent = 0
-            while (offset < padded.size && link === sink) {
+            while (offset < padded.size && alive()) {
                 val size = minOf(chunk, padded.size - offset)
                 sink.write(padded.copyOfRange(offset, offset + size), size)
                 offset += size
@@ -249,7 +360,7 @@ object DirectionsVoice {
             // Let the car play what it has before closing the stream on it.
             Thread.sleep(LEAD_MS)
         } finally {
-            sink.stop()
+            if (startAndStop) sink.stop()
         }
     }
 
@@ -321,6 +432,11 @@ object DirectionsVoice {
     private const val PREPARE_FROM_METERS = 2_500
     private const val PREPARE_AT_METERS = 1_000
     private const val LEAD_MS = 100L
+    private const val HOLD_MS = 2_000L
     private const val SYNTH_TIMEOUT_S = 10L
-    private val ORDINALS = listOf("first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth")
+    private const val RESTART_MS = 30_000L
+    private val ORDINALS = listOf(
+        R.string.dir_ordinal_1, R.string.dir_ordinal_2, R.string.dir_ordinal_3, R.string.dir_ordinal_4,
+        R.string.dir_ordinal_5, R.string.dir_ordinal_6, R.string.dir_ordinal_7, R.string.dir_ordinal_8,
+    )
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/LauncherMode.kt

@@ -0,0 +1,79 @@
+package app.seb3thehacker.gearslip.car
+
+import android.app.ActivityOptions
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.os.Build
+import android.provider.Settings
+import android.view.Display
+import app.seb3thehacker.gearslip.GearslipLog
+import app.seb3thehacker.gearslip.LauncherActivity
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+/**
+ * Gearslip as the home screen of the device it runs on: a head unit that runs Android itself, or
+ * a spare phone or tablet on the dash. The car UI fills the device's own screen, with no car in
+ * between. Off until it's turned on in Settings, so a phone never lists Gearslip as a home app.
+ */
+object LauncherMode {
+
+    private val _active = MutableStateFlow(false)
+
+    /** The car UI is up on this device's own screen, as its home screen. */
+    val active: StateFlow<Boolean> = _active
+
+    internal fun setActive(on: Boolean) {
+        _active.value = on
+    }
+
+    private fun component(context: Context) = ComponentName(context, LauncherActivity::class.java)
+
+    /** Whether Android may offer Gearslip as the home app. */
+    fun enabled(context: Context): Boolean =
+        context.packageManager.getComponentEnabledSetting(component(context)) ==
+            PackageManager.COMPONENT_ENABLED_STATE_ENABLED
+
+    fun setEnabled(context: Context, on: Boolean) {
+        context.packageManager.setComponentEnabledSetting(
+            component(context),
+            if (on) PackageManager.COMPONENT_ENABLED_STATE_ENABLED else PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
+            PackageManager.DONT_KILL_APP,
+        )
+        GearslipLog.i("launcher mode ${if (on) "on" else "off"}")
+    }
+
+    /** Android's own "Default home app" choice, where Gearslip is picked once it's offered. */
+    fun openHomeChoice(context: Context) {
+        runCatching {
+            context.startActivity(Intent(Settings.ACTION_HOME_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
+        }.onFailure { GearslipLog.w("launcher mode: no home app settings on this device (${it.message})") }
+    }
+
+    /** Head units and most tablets have no phone of their own to call with. */
+    fun canCall(context: Context): Boolean {
+        val feature = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            PackageManager.FEATURE_TELEPHONY_CALLING
+        } else {
+            @Suppress("DEPRECATION")
+            PackageManager.FEATURE_TELEPHONY
+        }
+        return context.packageManager.hasSystemFeature(feature)
+    }
+
+    /**
+     * Opens an ordinary app full screen, Gearslip's own phone screens included. The car UI lives
+     * on a display of its own, and a context from it would start the app there, which Android
+     * refuses; the application context and the device's own display put it on the real screen.
+     */
+    fun launch(context: Context, packageName: String) {
+        val app = context.applicationContext
+        val intent = app.packageManager.getLaunchIntentForPackage(packageName) ?: return
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        val options = ActivityOptions.makeBasic().setLaunchDisplayId(Display.DEFAULT_DISPLAY)
+        runCatching { app.startActivity(intent, options.toBundle()) }
+            .onFailure { GearslipLog.w("launcher mode: couldn't open $packageName (${it.message})") }
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/MapControlsWake.kt

@@ -11,27 +11,35 @@ import android.os.SystemClock
  *
  * They fade out after [IDLE_MS] with no touch anywhere on the car screen, to leave the map clear,
  * and any touch brings them back. [touch] is called for every pointer event and is cheap: it only
- * writes state when the buttons were actually hidden.
+ * writes state when the buttons were actually hidden. The nav bar, when set to hide, goes the
+ * same way but waits longer ([NAV_BAR_IDLE_MS]).
  */
 class MapControlsWake {
 
     var awake by mutableStateOf(true)
         private set
 
+    var navBarAwake by mutableStateOf(true)
+        private set
+
     private var lastTouch = SystemClock.uptimeMillis()
 
     fun touch() {
         lastTouch = SystemClock.uptimeMillis()
         if (!awake) awake = true
+        if (!navBarAwake) navBarAwake = true
     }
 
     /** Called on a timer; hides the buttons once nothing has touched the screen for [IDLE_MS]. */
     fun tick() {
-        if (awake && SystemClock.uptimeMillis() - lastTouch >= IDLE_MS) awake = false
+        val idle = SystemClock.uptimeMillis() - lastTouch
+        if (awake && idle >= IDLE_MS) awake = false
+        if (navBarAwake && idle >= NAV_BAR_IDLE_MS) navBarAwake = false
     }
 
     companion object {
         const val IDLE_MS = 4_000L
+        const val NAV_BAR_IDLE_MS = 8_000L
     }
 }
 

gearslip/src/main/java/app/seb3thehacker/gearslip/car/MediaBrowse.kt

@@ -0,0 +1,348 @@
+package app.seb3thehacker.gearslip.car
+
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import app.seb3thehacker.gearslip.car.theme.*
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.foundation.layout.Arrangement
+import android.provider.Settings
+import android.content.Intent
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableLongStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.PathFillType
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.graphics.vector.addPathNodes
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import app.seb3thehacker.gearslip.media.CarMedia
+import app.seb3thehacker.gearslip.media.MediaApp
+import app.seb3thehacker.gearslip.media.MediaArt
+import app.seb3thehacker.gearslip.media.LyricsResult
+import app.seb3thehacker.gearslip.media.Lyrics
+import app.seb3thehacker.gearslip.media.MediaEntry
+import app.seb3thehacker.gearslip.media.NowPlaying
+import app.seb3thehacker.gearslip.media.QueueTrack
+import android.media.session.PlaybackState
+import kotlinx.coroutines.delay
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.PaddingValues
+
+// The media screen's browse list, up-next queue, rows and icons. Split out of MediaScreen.kt.
+
+@Composable
+internal fun BrowsePanel(browse: app.seb3thehacker.gearslip.media.BrowseState, media: CarMedia, appLabel: String, modifier: Modifier) {
+    Column(modifier) {
+        // At the library root there's no trail and nowhere to go up to, so there's nothing this
+        // row could say that the app's name in the top-left corner hasn't already - showing it
+        // again here (as "Browse", or as the app's own name) was just the same label twice.
+        if (media.canGoUp || browse.trail.isNotEmpty()) {
+            Row(Modifier.padding(bottom = 12.dp), verticalAlignment = Alignment.CenterVertically) {
+                if (media.canGoUp) {
+                    GsIconButton(Icons.Filled.ArrowBack, stringResource(R.string.media_up), media::up, size = 44.dp, shape = CircleShape)
+                    Spacer(Modifier.width(14.dp))
+                }
+                browse.trail.lastOrNull()?.let {
+                    Text(
+                        it,
+                        style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold,
+                        maxLines = 1, overflow = TextOverflow.Ellipsis,
+                    )
+                }
+            }
+        }
+        when {
+            browse.loading -> Notice(stringResource(R.string.media_loading), null)
+            browse.unavailable -> Notice(
+                stringResource(R.string.media_keeps_library, appLabel),
+                stringResource(R.string.media_browse_start),
+            )
+            browse.failed -> Notice(stringResource(R.string.media_load_failed), null)
+            browse.entries.isEmpty() -> Notice(stringResource(R.string.media_nothing_here), null)
+            else -> BrowseList(browse.entries, media)
+        }
+    }
+}
+
+/**
+ * A list laid out the way the app asked: under its section headings, covers where it asked for a
+ * grid and rows everywhere else. A grid section among others is a shelf that scrolls sideways; a
+ * list that is one grid and nothing else wraps into rows of covers instead.
+ */
+@Composable
+private fun BrowseList(entries: List<MediaEntry>, media: CarMedia) {
+    val sections = remember(entries) { browseSections(entries) }
+    BoxWithConstraints(Modifier.fillMaxSize()) {
+        val onlyGrid = sections.size == 1 && sections[0].grid && sections[0].heading == null
+        val columns = ((maxWidth + SHELF_GAP) / (SHELF_COVER + SHELF_GAP)).toInt().coerceAtLeast(2)
+        LazyColumn(
+            Modifier.fillMaxSize(),
+            contentPadding = PaddingValues(bottom = 8.dp),
+            verticalArrangement = Arrangement.spacedBy(10.dp),
+        ) {
+            sections.forEachIndexed { i, section ->
+                val heading = section.heading
+                if (heading != null && sections.getOrNull(i - 1)?.heading != heading) {
+                    item(key = "heading $i") {
+                        Text(
+                            heading,
+                            style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold,
+                            maxLines = 1, overflow = TextOverflow.Ellipsis,
+                            modifier = Modifier.padding(top = if (i == 0) 0.dp else 8.dp),
+                        )
+                    }
+                }
+                when {
+                    !section.grid -> items(section.entries, key = { it.id }) { entry -> EntryRow(entry, media) }
+                    onlyGrid -> items(section.entries.chunked(columns)) { row ->
+                        Row(horizontalArrangement = Arrangement.spacedBy(SHELF_GAP)) {
+                            row.forEach { CoverTile(it, media, Modifier.weight(1f)) }
+                            repeat(columns - row.size) { Spacer(Modifier.weight(1f)) }
+                        }
+                    }
+                    else -> item(key = "shelf $i") {
+                        androidx.compose.foundation.lazy.LazyRow(horizontalArrangement = Arrangement.spacedBy(SHELF_GAP)) {
+                            items(section.entries, key = { it.id }) { CoverTile(it, media, Modifier.width(SHELF_COVER)) }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+private val SHELF_COVER = 132.dp
+private val SHELF_GAP = 14.dp
+
+/** A run of entries under one heading that are all covers or all rows. */
+private class BrowseSection(val heading: String?, val grid: Boolean, val entries: List<MediaEntry>)
+
+private fun browseSections(entries: List<MediaEntry>): List<BrowseSection> {
+    val out = mutableListOf<BrowseSection>()
+    var run = mutableListOf<MediaEntry>()
+    for (entry in entries) {
+        val last = run.lastOrNull()
+        if (last != null && (last.group != entry.group || last.grid != entry.grid)) {
+            out += BrowseSection(last.group, last.grid, run)
+            run = mutableListOf()
+        }
+        run += entry
+    }
+    run.lastOrNull()?.let { out += BrowseSection(it.group, it.grid, run) }
+    return out
+}
+
+/** One entry as a cover with its name under it: what the app's grids are made of. */
+@Composable
+private fun CoverTile(entry: MediaEntry, media: CarMedia, modifier: Modifier) {
+    val context = LocalContext.current
+    val icon by produceState(entry.iconBitmap, entry.iconUri) {
+        value = entry.iconBitmap ?: MediaArt.load(context, entry.iconUri)
+    }
+    val shape = RoundedCornerShape(16.dp)
+    Column(modifier.clip(shape).clickable { media.select(entry) }) {
+        Box(
+            Modifier
+                .fillMaxWidth()
+                .aspectRatio(1f)
+                .gsPanelShadow(shape)
+                .clip(shape)
+                .background(MaterialTheme.colorScheme.surfaceContainerHigh),
+            contentAlignment = Alignment.Center,
+        ) {
+            icon?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
+                ?: Icon(
+                    if (entry.browsable) MediaIcons.Folder else MediaIcons.MusicNote, null,
+                    tint = MaterialTheme.colorScheme.onSurfaceVariant, modifier = Modifier.fillMaxSize(0.35f),
+                )
+        }
+        Text(
+            entry.title, style = MaterialTheme.typography.titleSmall, fontWeight = FontWeight.SemiBold,
+            maxLines = 1, overflow = TextOverflow.Ellipsis, modifier = Modifier.padding(top = 8.dp, start = 2.dp),
+        )
+        if (entry.subtitle.isNotEmpty()) {
+            Text(
+                entry.subtitle, style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1, overflow = TextOverflow.Ellipsis, modifier = Modifier.padding(start = 2.dp, bottom = 4.dp),
+            )
+        }
+    }
+}
+
+// --- up next -----------------------------------------------------------------------------------
+
+/**
+ * Whatever the app has queued up, starting right after the track that's playing now - not the
+ * whole queue from the top, which would just repeat what the player beside it already shows. Apps
+ * that never publish a queue (many don't) show an empty notice rather than a permanently blank tab.
+ */
+@Composable
+internal fun QueuePanel(queue: List<QueueTrack>, now: NowPlaying, media: CarMedia, modifier: Modifier) {
+    val upNext = remember(queue, now.activeQueueItemId) {
+        val current = queue.indexOfFirst { it.queueId == now.activeQueueItemId }
+        if (current >= 0) queue.drop(current + 1) else queue
+    }
+    Column(modifier) {
+        if (upNext.isEmpty()) {
+            Notice(
+                stringResource(R.string.media_nothing_queued),
+                stringResource(if (now.title.isEmpty()) R.string.media_queue_empty_idle else R.string.media_queue_empty_playing),
+            )
+        } else {
+            LazyColumn(
+                Modifier.fillMaxSize(),
+                contentPadding = PaddingValues(bottom = 8.dp),
+                verticalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                items(upNext, key = { it.queueId }) { track -> QueueRow(track, media) }
+            }
+        }
+    }
+}
+
+@Composable
+private fun QueueRow(track: QueueTrack, media: CarMedia) {
+    val context = LocalContext.current
+    val icon by produceState(track.iconBitmap, track.iconUri) {
+        value = track.iconBitmap ?: MediaArt.load(context, track.iconUri)
+    }
+    Surface(
+        onClick = { media.playQueueItem(track) },
+        shape = MaterialTheme.shapes.large,
+        color = MaterialTheme.colorScheme.surfaceContainer,
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Row(Modifier.padding(8.dp), verticalAlignment = Alignment.CenterVertically) {
+            RowArt(icon, MediaIcons.MusicNote)
+            Column(Modifier.weight(1f).padding(horizontal = 14.dp)) {
+                Text(track.title, style = MaterialTheme.typography.titleMedium, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                if (track.subtitle.isNotEmpty()) {
+                    Text(track.subtitle, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                }
+            }
+            Icon(Icons.Filled.PlayArrow, stringResource(R.string.media_play), tint = MaterialTheme.colorScheme.onSurfaceVariant)
+        }
+    }
+}
+
+@Composable
+internal fun EntryRow(entry: MediaEntry, media: CarMedia, onClick: () -> Unit = { media.select(entry) }) {
+    val context = LocalContext.current
+    val icon by produceState(entry.iconBitmap, entry.iconUri) {
+        value = entry.iconBitmap ?: MediaArt.load(context, entry.iconUri)
+    }
+    Surface(
+        onClick = onClick,
+        shape = MaterialTheme.shapes.large,
+        color = MaterialTheme.colorScheme.surfaceContainer,
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Row(Modifier.padding(8.dp), verticalAlignment = Alignment.CenterVertically) {
+            RowArt(icon, if (entry.browsable) MediaIcons.Folder else MediaIcons.MusicNote)
+            Column(Modifier.weight(1f).padding(horizontal = 14.dp)) {
+                Text(entry.title, style = MaterialTheme.typography.titleMedium, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                if (entry.subtitle.isNotEmpty()) {
+                    Text(entry.subtitle, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                }
+            }
+            if (entry.browsable && entry.playable) {
+                GsIconButton(Icons.Filled.PlayArrow, stringResource(R.string.media_play), { media.playAll(entry) })
+            }
+            if (entry.browsable) Icon(Icons.AutoMirrored.Filled.KeyboardArrowRight, null)
+        }
+    }
+}
+
+/** A row's artwork, or a folder or note in its place when the app sends none. */
+@Composable
+private fun RowArt(icon: android.graphics.Bitmap?, fallback: ImageVector) {
+    Box(
+        Modifier.size(56.dp).clip(RoundedCornerShape(12.dp)).background(MaterialTheme.colorScheme.surfaceContainerHigh),
+        contentAlignment = Alignment.Center,
+    ) {
+        if (icon != null) Image(icon.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop)
+        else Icon(fallback, null, tint = MaterialTheme.colorScheme.onSurfaceVariant, modifier = Modifier.size(30.dp))
+    }
+}
+
+/** Material's transport icons, from their published path data (they live in the extended set). */
+internal object MediaIcons {
+    val MusicNote = icon("MusicNote", "M12,3v10.55c-0.59,-0.34 -1.27,-0.55 -2,-0.55 -2.21,0 -4,1.79 -4,4s1.79,4 4,4 4,-1.79 4,-4V7h4V3h-6z")
+    val Folder = icon("Folder", "M10,4H4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V8c0,-1.1 -0.9,-2 -2,-2h-8l-2,-2z")
+    val Pause = icon("Pause", "M6,19h4L10,5L6,5v14zM14,5v14h4L18,5h-4z")
+    val Next = icon("SkipNext", "M6,18l8.5,-6L6,6v12zM16,6v12h2V6h-2z")
+    /** The 3x3 app grid; not in material-icons-core. */
+    val Apps = icon("Apps", "M4,8h4L8,4L4,4v4zM10,20h4v-4h-4v4zM4,20h4v-4L4,16v4zM4,14h4v-4L4,10v4zM10,14h4v-4h-4v4zM16,4v4h4L20,4h-4zM10,8h4L14,4h-4v4zM16,14h4v-4h-4v4zM16,20h4v-4h-4v4z")
+    val Previous = icon("SkipPrevious", "M6,6h2v12L6,18zM9.5,12l8.5,6V6z")
+    val Equalizer = icon("Equalizer", "M10,20h4L14,4h-4v16zM4,20h4v-8L4,12v8zM16,9v11h4L20,9h-4z")
+    val Shuffle = icon("Shuffle", "M10.59,9.17L5.41,4 4,5.41l5.17,5.17 1.42,-1.41zM14.5,4l2.04,2.04L4,18.59 5.41,20 17.96,7.46 20,9.5L20,4h-5.5zM14.83,13.41l-1.41,1.41 3.13,3.13L14.5,20L20,20v-5.5l-2.04,2.04 -3.13,-3.13z")
+    val Repeat = icon("Repeat", "M7,7h10v3l4,-4 -4,-4v3L5,5v6h2L7,7zM17,17L7,17v-3l-4,4 4,4v-3h12v-6h-2v4z")
+    val RepeatOne = icon("RepeatOne", "M7,7h10v3l4,-4 -4,-4v3L5,5v6h2L7,7zM17,17L7,17v-3l-4,4 4,4v-3h12v-6h-2v4zM13,15L13,9h-1l-2,1v1h1.5v4L13,15z")
+    /**
+     * A screen split into the map and a side panel: outlined while the panel is closed ("put the
+     * player beside the map"), filled in while it's open ("close it"), on the side it opens on.
+     */
+    val DockRight = icon("DockRight", "M2,4h20v16H2zM4,6h10v12H4zM16,6h4v12h-4z", PathFillType.EvenOdd)
+    val DockRightOpen = icon("DockRightOpen", "M2,4h20v16H2zM4,6h10v12H4z", PathFillType.EvenOdd)
+    val DockLeft = icon("DockLeft", "M2,4h20v16H2zM4,6h4v12H4zM10,6h10v12H10z", PathFillType.EvenOdd)
+    val DockLeftOpen = icon("DockLeftOpen", "M2,4h20v16H2zM10,6h10v12H10z", PathFillType.EvenOdd)
+    val Fullscreen = icon("Fullscreen", "M7,14L5,14v5h5v-2L7,17v-3zM5,10h2L7,7h3L10,5L5,5v5zM17,17h-3v2h5v-5h-2v3zM14,5v2h3v3h2L19,5h-5z")
+    val FullscreenExit = icon("FullscreenExit", "M5,16h3v3h2v-5L5,14v2zM8,8L5,8v2h5L10,5L8,5v3zM14,19h2v-3h3v-2h-5v5zM16,8L16,5h-2v5h5L19,8h-3z")
+
+    val CallEnd = icon("CallEnd", "M12,9c-1.6,0 -3.15,0.25 -4.6,0.72v3.1c0,0.39 -0.23,0.74 -0.56,0.9 -0.98,0.49 -1.87,1.12 -2.66,1.85 -0.18,0.18 -0.43,0.28 -0.7,0.28 -0.28,0 -0.53,-0.11 -0.71,-0.29L0.29,13.08c-0.18,-0.17 -0.29,-0.42 -0.29,-0.7 0,-0.28 0.11,-0.53 0.29,-0.71C3.34,8.78 7.46,7 12,7s8.66,1.78 11.71,4.67c0.18,0.18 0.29,0.43 0.29,0.71 0,0.28 -0.11,0.53 -0.29,0.71l-2.48,2.48c-0.18,0.18 -0.43,0.29 -0.71,0.29 -0.27,0 -0.52,-0.11 -0.7,-0.28 -0.79,-0.74 -1.69,-1.36 -2.67,-1.85 -0.33,-0.16 -0.56,-0.5 -0.56,-0.9v-3.1C15.15,9.25 13.6,9 12,9z")
+    val Mic = icon("Mic", "M12,14c1.66,0 2.99,-1.34 2.99,-3L15,5c0,-1.66 -1.34,-3 -3,-3S9,3.34 9,5v6c0,1.66 1.34,3 3,3zM17.3,11c0,3 -2.54,5.1 -5.3,5.1S6.7,14 6.7,11L5,11c0,3.41 2.72,6.23 6,6.72L11,21h2v-3.28c3.28,-0.48 6,-3.3 6,-6.72h-1.7z")
+    val MicOff = icon("MicOff", "M19,11h-1.7c0,0.74 -0.16,1.43 -0.43,2.05l1.23,1.23c0.56,-0.98 0.9,-2.09 0.9,-3.28zM14.98,11.17c0,-0.06 0.02,-0.11 0.02,-0.17L15,5c0,-1.66 -1.34,-3 -3,-3S9,3.34 9,5v0.18l5.98,5.99zM4.27,3L3,4.27l6.01,6.01L9,11c0,1.66 1.33,3 2.99,3 0.22,0 0.44,-0.03 0.65,-0.08l1.66,1.66c-0.71,0.33 -1.5,0.52 -2.31,0.52 -2.76,0 -5.3,-2.1 -5.3,-5.1L5,11c0,3.41 2.72,6.23 6,6.72L11,21h2v-3.28c0.91,-0.13 1.77,-0.45 2.54,-0.9L19.73,21 21,19.73 4.27,3z")
+
+    private fun icon(name: String, path: String, fillType: PathFillType = PathFillType.NonZero) = ImageVector.Builder(
+        name, 24.dp, 24.dp, 24f, 24f,
+    ).addPath(addPathNodes(path), pathFillType = fillType, fill = SolidColor(androidx.compose.ui.graphics.Color.Black)).build()
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/MediaScreen.kt

@@ -1,9 +1,14 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.Image
+import androidx.compose.ui.unit.sp
+import androidx.compose.foundation.text.TextAutoSize
+import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.background
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
@@ -19,6 +24,7 @@ import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
@@ -49,6 +55,9 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.draw.drawWithContent
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.text.withStyle
 import androidx.compose.ui.graphics.PathFillType
 import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.foundation.layout.widthIn
@@ -93,21 +102,22 @@ fun MediaScreen(app: MediaApp, onExit: () -> Unit) {
 
     // The connection outlives this screen: the home screen's player is the same one.
     LaunchedEffect(app) { CarServices.openMedia(app) }
+    androidx.compose.runtime.DisposableEffect(Unit) { onDispose { CarServices.mediaScreenClosed() } }
 
     val art = rememberArt(now)
 
-    // The art's colour behind everything, header included; the buttons keep their own.
-    Surface(Modifier.fillMaxSize(), color = rememberArtColor(art, MaterialTheme.colorScheme.background, darkLightness = 0.15f, lightLightness = 0.9f)) {
+    // The theme's background, with the cover's colours glowing faintly behind the cover on the left.
+    Surface(Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background) {
+        if (phase == CarMedia.Phase.READY && !searching) AlbumGlow(art, Modifier.fillMaxSize(), wide = true)
         if (phase != CarMedia.Phase.READY) {
-            Column(Modifier.fillMaxSize()) {
+            Column(Modifier.fillMaxSize().padding(bottom = LocalNavBarInset.current)) {
                 AppIdentity(app, onExit, Modifier.padding(horizontal = 16.dp, vertical = 10.dp))
                 when (phase) {
                     CarMedia.Phase.REJECTED -> when (rejection) {
                         CarMedia.Rejection.NEEDS_NOTIFICATION_ACCESS -> Notice(
-                            "${app.label} keeps its library to itself.",
-                            "Gearslip can still control it once it has Notification access on the phone. " +
-                                "Allow it under Settings > Notifications > Notification access.",
-                            action = "Open on phone" to {
+                            stringResource(R.string.media_keeps_library, app.label),
+                            stringResource(R.string.media_needs_access),
+                            action = stringResource(R.string.media_open_on_phone) to {
                                 val app = context.applicationContext
                                 runCatching {
                                     app.startActivity(
@@ -117,24 +127,23 @@ fun MediaScreen(app: MediaApp, onExit: () -> Unit) {
                             },
                         )
                         CarMedia.Rejection.NEEDS_APP_RUNNING -> Notice(
-                            "${app.label} isn't running.",
-                            "${app.label} plays through Gearslip's own player, but only while it's " +
-                                "open on the phone. Open it once and it keeps playing here in the car.",
-                            action = "Open ${app.label}" to { media.launchAndConnect(app) },
+                            stringResource(R.string.media_not_running, app.label),
+                            stringResource(R.string.media_not_running_body, app.label),
+                            action = stringResource(R.string.media_open_app, app.label) to { media.launchAndConnect(app) },
                         )
                         CarMedia.Rejection.REFUSED -> Notice(
-                            "${app.label} would not let Gearslip browse it.",
-                            "Some media apps only accept Google's own host.",
+                            stringResource(R.string.media_refused, app.label),
+                            stringResource(R.string.media_refused_body),
                         )
                     }
-                    else -> Notice("Connecting to ${app.label}…", null)
+                    else -> Notice(stringResource(R.string.media_connecting, app.label), null)
                 }
             }
             return@Surface
         }
 
         if (searching) {
-            SearchPanel(
+            Box(Modifier.padding(bottom = LocalNavBarInset.current)) { SearchPanel(
                 appLabel = app.label,
                 media = media,
                 canPickForYou = now.canSearch,
@@ -152,52 +161,91 @@ fun MediaScreen(app: MediaApp, onExit: () -> Unit) {
                     tab = Tab.NOW_PLAYING
                 },
                 onClose = { searching = false },
-            )
+            ) }
             return@Surface
         }
 
-        // Two columns, split the same way on every tab so nothing jumps when switching: the app
-        // and the art (or, beside a list, the compact player) on the left; the tabs across the
-        // top of the right column, over whatever the tab shows.
-        Row(
-            Modifier.fillMaxSize().padding(start = 16.dp, end = 16.dp, top = 10.dp, bottom = 8.dp),
-            horizontalArrangement = Arrangement.spacedBy(24.dp),
-        ) {
-            Column(Modifier.weight(0.8f).fillMaxHeight()) {
-                AppIdentity(app, onExit)
-                Spacer(Modifier.height(12.dp))
-                if (tab == Tab.NOW_PLAYING) {
-                    CoverArt(art, Modifier.weight(1f).fillMaxWidth())
-                } else {
-                    CompactPlayer(now, media, Modifier.weight(1f).fillMaxWidth())
+        // The page runs down under the see-through nav bar, so the cover's glow carries on behind
+        // it; the content stops at the bar's top edge. Lists run right to it; the rest keeps a gap.
+        val barTop = LocalNavBarInset.current
+        val barInset = barTop + 8.dp
+        val tabs: @Composable (Modifier) -> Unit = { tabModifier ->
+            MediaTab(stringResource(R.string.media_now_playing), tab == Tab.NOW_PLAYING, tabModifier) { tab = Tab.NOW_PLAYING }
+            MediaTab(stringResource(R.string.media_up_next), tab == Tab.QUEUE, tabModifier) { tab = Tab.QUEUE }
+            MediaTab(stringResource(R.string.media_browse), tab == Tab.BROWSE, tabModifier) { tab = Tab.BROWSE }
+            MediaTab(stringResource(R.string.storage_lyrics), tab == Tab.LYRICS, tabModifier) { tab = Tab.LYRICS }
+        }
+        val searchButton: @Composable () -> Unit = {
+            if (now.canSearch || media.canSearchLibrary) {
+                GsIconButton(
+                    Icons.Filled.Search,
+                    stringResource(R.string.media_search, app.label),
+                    { searching = true },
+                    colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.colorScheme.onSurface),
+                    size = 44.dp,
+                    shape = MaterialTheme.shapes.large,
+                )
+            }
+        }
+        val tabContent: @Composable (Modifier) -> Unit = { contentModifier ->
+            Box(contentModifier) {
+                when (tab) {
+                    Tab.NOW_PLAYING -> StageControls(now, media, Modifier.fillMaxSize().padding(bottom = barInset))
+                    Tab.BROWSE -> BrowsePanel(browse, media, app.label, Modifier.fillMaxSize().padding(bottom = barTop))
+                    Tab.QUEUE -> QueuePanel(queue, now, media, Modifier.fillMaxSize().padding(bottom = barTop))
+                    Tab.LYRICS -> LyricsPanel(now, Modifier.fillMaxSize().padding(bottom = barInset))
                 }
             }
-            Column(Modifier.weight(1.2f).fillMaxHeight()) {
-                Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
-                    MediaTab("Now playing", tab == Tab.NOW_PLAYING, Modifier.weight(1f)) { tab = Tab.NOW_PLAYING }
-                    MediaTab("Browse", tab == Tab.BROWSE, Modifier.weight(1f)) { tab = Tab.BROWSE }
-                    MediaTab("Up next", tab == Tab.QUEUE, Modifier.weight(1f)) { tab = Tab.QUEUE }
-                    MediaTab("Lyrics", tab == Tab.LYRICS, Modifier.weight(1f)) { tab = Tab.LYRICS }
-                    if (now.canSearch || media.canSearchLibrary) {
-                        GsIconButton(
-                            Icons.Filled.Search,
-                            "Search ${app.label}",
-                            { searching = true },
-                            colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.colorScheme.onSurface),
-                            size = 44.dp,
-                            shape = MaterialTheme.shapes.large,
-                        )
+        }
+
+        BoxWithConstraints(Modifier.fillMaxSize().padding(start = 16.dp, end = 16.dp, top = 10.dp)) {
+            // A small screen, or a big one at Extra large size, has no room for two columns: the
+            // app and the tabs share one bar, and a list takes the whole width. The nav bar keeps
+            // the controls, so nothing is lost.
+            if (maxWidth < NARROW_WIDTH || maxHeight - barInset < NARROW_HEIGHT) {
+                Column(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                    Row(
+                        Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.spacedBy(12.dp),
+                        verticalAlignment = Alignment.CenterVertically,
+                    ) {
+                        AppIdentity(app, onExit, Modifier.widthIn(max = 180.dp))
+                        Row(
+                            Modifier.weight(1f).horizontalScroll(rememberScrollState()),
+                            horizontalArrangement = Arrangement.spacedBy(8.dp, Alignment.End),
+                        ) { tabs(Modifier) }
+                        searchButton()
+                    }
+                    search?.let { SearchStatus(it, app.label, media::dismissSearch) }
+                    if (tab == Tab.NOW_PLAYING) NowPlayingPage(now, media, Modifier.weight(1f).fillMaxWidth().padding(bottom = barInset), padded = false)
+                    else tabContent(Modifier.weight(1f).fillMaxWidth())
+                }
+                return@BoxWithConstraints
+            }
+
+            // Two columns, split the same way on every tab so nothing jumps when switching: the app
+            // and the art (or, beside a list, the compact player) on the left; the tabs across the
+            // top of the right column, over whatever the tab shows.
+            Row(Modifier.fillMaxSize(), horizontalArrangement = Arrangement.spacedBy(24.dp)) {
+                Column(Modifier.weight(0.8f).fillMaxHeight().padding(bottom = barInset)) {
+                    AppIdentity(app, onExit)
+                    Spacer(Modifier.height(12.dp))
+                    if (tab == Tab.NOW_PLAYING) {
+                        CoverArt(art, Modifier.weight(1f).fillMaxWidth())
+                    } else {
+                        CompactPlayer(now, media, art, Modifier.weight(1f).fillMaxWidth())
                     }
                 }
-                search?.let { SearchStatus(it, app.label, media::dismissSearch) }
-                Spacer(Modifier.height(12.dp))
-                Box(Modifier.weight(1f).fillMaxWidth()) {
-                    when (tab) {
-                        Tab.NOW_PLAYING -> NowPlayingControls(now, media, Modifier.fillMaxSize())
-                        Tab.BROWSE -> BrowsePanel(browse, media, app.label, Modifier.fillMaxSize())
-                        Tab.QUEUE -> QueuePanel(queue, now, media, Modifier.fillMaxSize())
-                        Tab.LYRICS -> LyricsPanel(now, Modifier.fillMaxSize())
+                Column(Modifier.weight(1.2f).fillMaxHeight()) {
+                    // The tabs share the row evenly; a long word (a translation, a big text size)
+                    // shrinks to fit its tab instead.
+                    Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                        tabs(Modifier.weight(1f))
+                        searchButton()
                     }
+                    search?.let { SearchStatus(it, app.label, media::dismissSearch) }
+                    Spacer(Modifier.height(12.dp))
+                    tabContent(Modifier.weight(1f).fillMaxWidth())
                 }
             }
         }
@@ -212,7 +260,7 @@ fun MediaScreen(app: MediaApp, onExit: () -> Unit) {
 private fun AppIdentity(app: MediaApp, onExit: () -> Unit, modifier: Modifier = Modifier) {
     val icon = remember(app) { findEntry(app.component.flattenToString())?.icon }
     Row(modifier, verticalAlignment = Alignment.CenterVertically) {
-        GsIconButton(Icons.Filled.ArrowBack, "Back", onExit, size = 44.dp)
+        GsIconButton(Icons.Filled.ArrowBack, stringResource(R.string.back), onExit, size = 44.dp)
         Spacer(Modifier.width(14.dp))
         icon?.let {
             Image(it, null, Modifier.size(26.dp).clip(RoundedCornerShape(7.dp)))
@@ -272,10 +320,10 @@ private fun SearchPanel(
             verticalAlignment = Alignment.CenterVertically,
             horizontalArrangement = Arrangement.spacedBy(8.dp),
         ) {
-            GsIconButton(Icons.Filled.ArrowBack, "Back", onClose, size = ICON_BUTTON_SIZE)
+            GsIconButton(Icons.Filled.ArrowBack, stringResource(R.string.back), onClose, size = ICON_BUTTON_SIZE)
             SearchField(
                 query,
-                "Search $appLabel",
+                stringResource(R.string.media_search, appLabel),
                 Modifier.weight(1f).clickable { typing = true },
                 onClear = {
                     query = ""
@@ -286,12 +334,12 @@ private fun SearchPanel(
         Box(Modifier.weight(1f).fillMaxWidth().padding(horizontal = 16.dp)) {
             val entries = current?.entries
             when {
-                trimmed.isEmpty() -> SearchNote("Type a song, artist, album, or playlist.")
+                trimmed.isEmpty() -> SearchNote(stringResource(R.string.media_search_hint))
                 unsupported && canPickForYou ->
-                    SearchNote("$appLabel can't list results. Press search, and $appLabel picks what to play.")
-                unsupported -> SearchNote("$appLabel can't search from the car.")
-                entries == null -> SearchNote("Searching $appLabel…")
-                entries.isEmpty() -> SearchNote("$appLabel found nothing for \"$trimmed\".")
+                    SearchNote(stringResource(R.string.media_search_no_list, appLabel))
+                unsupported -> SearchNote(stringResource(R.string.media_search_unsupported, appLabel))
+                entries == null -> SearchNote(stringResource(R.string.media_searching, appLabel))
+                entries.isEmpty() -> SearchNote(stringResource(R.string.media_search_nothing, appLabel, trimmed))
                 else -> LazyColumn(verticalArrangement = Arrangement.spacedBy(8.dp), contentPadding = PaddingValues(bottom = 8.dp)) {
                     items(entries) { entry ->
                         EntryRow(entry, media) {
@@ -349,8 +397,8 @@ private fun SearchStatus(search: CarMedia.Search, appLabel: String, onDismiss: (
         modifier = Modifier.fillMaxWidth().padding(top = 8.dp),
     ) {
         Text(
-            if (search.ignored) "$appLabel didn't play anything for \"${search.query}\"."
-            else "Searching $appLabel for \"${search.query}\"…",
+            if (search.ignored) stringResource(R.string.media_search_ignored, appLabel, search.query)
+            else stringResource(R.string.media_searching_for, appLabel, search.query),
             style = MaterialTheme.typography.bodyLarge,
             maxLines = 2,
             overflow = TextOverflow.Ellipsis,
@@ -375,14 +423,17 @@ private fun MediaTab(label: String, selected: Boolean, modifier: Modifier, onCli
             style = MaterialTheme.typography.titleSmall,
             fontWeight = if (selected) FontWeight.Bold else FontWeight.Normal,
             maxLines = 1,
-            overflow = TextOverflow.Ellipsis,
+            autoSize = TextAutoSize.StepBased(minFontSize = 11.sp, maxFontSize = MaterialTheme.typography.titleSmall.fontSize),
+            modifier = Modifier.padding(horizontal = 8.dp),
         )
     }
 }
 
 /**
- * The song's lyrics, fetched when this tab opens. Synced lyrics follow the playback position with
- * the current line in the accent colour; unsynced ones are plain scrolling text.
+ * The song's lyrics, fetched when this tab opens. Synced lyrics follow playback: the line being
+ * sung sits a little above the middle in bold, lines already sung dim, and the list fades out at
+ * both edges instead of cutting a line in half. Word-timed lyrics also light up each word as it's
+ * sung. Unsynced ones are plain scrolling text.
  */
 @Composable
 internal fun LyricsPanel(
@@ -393,43 +444,89 @@ internal fun LyricsPanel(
     val context = LocalContext.current
     val lyrics by produceState<LyricsState>(LyricsState.Loading, now.title, now.artist, now.album, now.durationMs) {
         value = LyricsState.Loading
-        value = Lyrics.find(context, now.title, now.artist, now.album, now.durationMs)
-            ?.let { LyricsState.Found(it) } ?: LyricsState.Missing
-    }
-    val list = rememberLazyListState()
-
-    // Ticks with playback so the highlighted line moves; only synced lyrics need it.
-    var position by remember { mutableLongStateOf(0L) }
-    LaunchedEffect(now) {
-        while (true) {
-            position = now.currentPosition()
-            kotlinx.coroutines.delay(300)
+        val found = Lyrics.find(context, now.title, now.artist, now.album, now.durationMs)
+        value = found?.let { LyricsState.Found(it) } ?: LyricsState.Missing
+        // Cached lyrics show at once; if a source now has better ones, they replace them.
+        if (found != null) {
+            Lyrics.upgrade(context, now.title, now.artist, now.album, now.durationMs, found)
+                ?.let { value = LyricsState.Found(it) }
         }
     }
 
     when (val state = lyrics) {
-        LyricsState.Loading -> Notice("Looking for lyrics…", null)
+        LyricsState.Loading -> Notice(stringResource(R.string.media_looking_lyrics), null)
         LyricsState.Missing -> Notice(
-            if (now.title.isEmpty()) "Nothing playing." else "No lyrics found for this track.",
+            stringResource(if (now.title.isEmpty()) R.string.media_nothing_playing_dot else R.string.media_no_lyrics),
             null,
         )
-        is LyricsState.Found -> {
-            val lines = state.result.lines
-            val current = if (state.result.synced) lines.indexOfLast { it.timeMs <= position } else -1
-            LaunchedEffect(current) {
-                if (current >= 0) list.animateScrollToItem((current - 1).coerceAtLeast(0))
+        is LyricsState.Found -> Column(modifier) {
+            if (state.result.synced) SyncedLyrics(now, state.result, lineStyle, Modifier.weight(1f).fillMaxWidth())
+            else PlainLyrics(state.result, lineStyle, Modifier.weight(1f).fillMaxWidth())
+            // Debug builds name the service the lyrics came from, to see which one answers.
+            if (app.seb3thehacker.gearslip.BuildConfig.DEBUG) {
+                val from = state.result.source.ifEmpty { "an older cache" }
+                val kind = when {
+                    state.result.lines.any { it.words.isNotEmpty() } -> "word-timed"
+                    state.result.synced -> "synced"
+                    else -> "plain"
+                }
+                Text(
+                    "From $from · $kind",
+                    Modifier.padding(top = 4.dp),
+                    style = MaterialTheme.typography.labelMedium,
+                    color = MaterialTheme.colorScheme.tertiary,
+                )
             }
-            LazyColumn(modifier, state = list, verticalArrangement = Arrangement.spacedBy(6.dp)) {
-                itemsIndexed(lines) { index, line ->
+        }
+    }
+}
+
+@Composable
+private fun SyncedLyrics(
+    now: NowPlaying,
+    result: LyricsResult,
+    lineStyle: androidx.compose.ui.text.TextStyle,
+    modifier: Modifier,
+) {
+    val lines = result.lines
+    val wordTimed = lines.any { it.words.isNotEmpty() }
+    // Every frame while words are filling in, so a word doesn't light up in steps; otherwise a
+    // few times a second is enough to move the line along.
+    var position by remember { mutableLongStateOf(now.currentPosition()) }
+    LaunchedEffect(now, wordTimed) {
+        while (true) {
+            position = now.currentPosition()
+            if (wordTimed && now.state == PlaybackState.STATE_PLAYING) androidx.compose.runtime.withFrameMillis { }
+            else delay(300)
+        }
+    }
+    // Only the line changing recomposes the list; the moving position is read by the one line.
+    val current by remember(lines) {
+        androidx.compose.runtime.derivedStateOf { lines.indexOfLast { it.timeMs <= position } }
+    }
+    val list = rememberLazyListState()
+    LaunchedEffect(current) {
+        if (current >= 0) list.animateScrollToItem(current)
+    }
+
+    val scheme = MaterialTheme.colorScheme
+    val sung = scheme.onSurfaceVariant.copy(alpha = 0.55f)
+    BoxWithConstraints(modifier.fadingEdges()) {
+        LazyColumn(
+            Modifier.fillMaxSize(),
+            state = list,
+            // The padding lets the first line start, and the last line end, near the middle.
+            contentPadding = PaddingValues(top = maxHeight * 0.32f, bottom = maxHeight * 0.6f),
+            verticalArrangement = Arrangement.spacedBy(10.dp),
+        ) {
+            itemsIndexed(lines) { index, line ->
+                if (index == current) {
+                    CurrentLine(line, { position }, lineStyle)
+                } else {
                     Text(
                         line.text.ifEmpty { " " },
                         style = lineStyle,
-                        fontWeight = if (index == current) FontWeight.Bold else FontWeight.Normal,
-                        color = when {
-                            !state.result.synced -> MaterialTheme.colorScheme.onSurface
-                            index == current -> MaterialTheme.colorScheme.primary
-                            else -> MaterialTheme.colorScheme.onSurfaceVariant
-                        },
+                        color = if (index < current) sung else scheme.onSurfaceVariant,
                     )
                 }
             }
@@ -437,6 +534,72 @@ internal fun LyricsPanel(
     }
 }
 
+/**
+ * The line being sung, in bold and a size up. With word timings, words already sung are in the
+ * accent colour, the one being sung fills in letter by letter, and the rest wait dimmed.
+ */
+@Composable
+private fun CurrentLine(line: app.seb3thehacker.gearslip.media.LyricLine, position: () -> Long, lineStyle: androidx.compose.ui.text.TextStyle) {
+    val scheme = MaterialTheme.colorScheme
+    val style = lineStyle.copy(fontWeight = FontWeight.Bold, fontSize = lineStyle.fontSize * 1.15f)
+    if (line.words.isEmpty()) {
+        Text(line.text.ifEmpty { " " }, style = style, color = scheme.primary)
+        return
+    }
+    val lit = scheme.primary
+    val waiting = scheme.onSurfaceVariant.copy(alpha = 0.7f)
+    val now = position()
+    val text = androidx.compose.ui.text.buildAnnotatedString {
+        line.words.forEachIndexed { i, word ->
+            // The line's first word has no leading space to trim, the last no trailing one.
+            val shown = if (i == line.words.lastIndex) word.text.trimEnd() else word.text
+            val progress = when {
+                now >= word.endMs -> 1f
+                now <= word.startMs -> 0f
+                else -> (now - word.startMs).toFloat() / (word.endMs - word.startMs).coerceAtLeast(1)
+            }
+            val letters = shown.trimEnd().length
+            val filled = progress * letters
+            shown.forEachIndexed { c, ch ->
+                val amount = (filled - c).coerceIn(0f, 1f)
+                withStyle(androidx.compose.ui.text.SpanStyle(color = androidx.compose.ui.graphics.lerp(waiting, lit, amount))) {
+                    append(ch)
+                }
+            }
+        }
+    }
+    Text(text, style = style)
+}
+
+@Composable
+private fun PlainLyrics(result: LyricsResult, lineStyle: androidx.compose.ui.text.TextStyle, modifier: Modifier) {
+    LazyColumn(
+        modifier.fadingEdges(),
+        contentPadding = PaddingValues(vertical = 24.dp),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        items(result.lines) { line ->
+            Text(line.text.ifEmpty { " " }, style = lineStyle, color = MaterialTheme.colorScheme.onSurface)
+        }
+    }
+}
+
+/** Fades the top and bottom edges out, so a line scrolling past doesn't end in a hard cut. */
+private fun Modifier.fadingEdges(): Modifier = this
+    .graphicsLayer { compositingStrategy = androidx.compose.ui.graphics.CompositingStrategy.Offscreen }
+    .drawWithContent {
+        drawContent()
+        drawRect(
+            androidx.compose.ui.graphics.Brush.verticalGradient(
+                0f to androidx.compose.ui.graphics.Color.Transparent,
+                0.14f to androidx.compose.ui.graphics.Color.Black,
+                0.86f to androidx.compose.ui.graphics.Color.Black,
+                1f to androidx.compose.ui.graphics.Color.Transparent,
+            ),
+            blendMode = androidx.compose.ui.graphics.BlendMode.DstIn,
+        )
+    }
+
 private sealed interface LyricsState {
     data object Loading : LyricsState
     data object Missing : LyricsState
@@ -444,7 +607,7 @@ private sealed interface LyricsState {
 }
 
 @Composable
-private fun Notice(title: String, detail: String?, action: Pair<String, () -> Unit>? = null) {
+internal fun Notice(title: String, detail: String?, action: Pair<String, () -> Unit>? = null) {
     Column(
         Modifier.fillMaxSize().padding(horizontal = 24.dp),
         verticalArrangement = Arrangement.Center,
@@ -467,31 +630,103 @@ private fun Notice(title: String, detail: String?, action: Pair<String, () -> Un
 // --- now playing -----------------------------------------------------------------------------
 
 /**
- * The now-playing view on its own, for places with no tabs around it (an app's own
- * now-playing template): the cover on the left, [NowPlayingControls] on the right.
+ * The now-playing view on its own: an app's own now-playing template, or the Now playing tab on a
+ * small screen. The cover on the left and [NowPlayingControls] on the right where there's room;
+ * narrower, the cover sits above the controls, and only when they still fit under it.
  */
 @Composable
-internal fun NowPlayingPage(now: NowPlaying, media: CarMedia, modifier: Modifier) {
-    Row(
-        modifier.padding(horizontal = 24.dp, vertical = 8.dp),
-        horizontalArrangement = Arrangement.spacedBy(24.dp),
-    ) {
-        CoverArt(rememberArt(now), Modifier.weight(0.8f).fillMaxHeight())
-        NowPlayingControls(now, media, Modifier.weight(1.2f).fillMaxHeight())
+internal fun NowPlayingPage(now: NowPlaying, media: CarMedia, modifier: Modifier, padded: Boolean = true) {
+    BoxWithConstraints(if (padded) modifier.padding(horizontal = 24.dp, vertical = 8.dp) else modifier) {
+        val art = rememberArt(now)
+        if (maxWidth >= 520.dp && maxHeight >= 260.dp) {
+            val artWidth = minOf(maxHeight, (maxWidth - 24.dp) * 0.4f)
+            Row(Modifier.fillMaxSize(), horizontalArrangement = Arrangement.spacedBy(24.dp)) {
+                CoverArt(art, Modifier.width(artWidth).fillMaxHeight())
+                NowPlayingControls(now, media, Modifier.weight(1f).fillMaxHeight())
+            }
+        } else {
+            val artHeight = if (maxHeight >= 400.dp) minOf(maxHeight * 0.25f, 160.dp) else 0.dp
+            Column(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                if (artHeight > 0.dp) CoverArt(art, Modifier.fillMaxWidth().height(artHeight))
+                NowPlayingControls(now, media, Modifier.weight(1f).fillMaxWidth())
+            }
+        }
     }
 }
 
 /** The cover, as big a square as its space allows, centred in it. */
 @Composable
-private fun CoverArt(art: android.graphics.Bitmap?, modifier: Modifier) {
-    BoxWithConstraints(modifier, contentAlignment = Alignment.Center) {
+private fun CoverArt(art: android.graphics.Bitmap?, modifier: Modifier, alignment: Alignment = Alignment.Center) {
+    BoxWithConstraints(modifier, contentAlignment = alignment) {
+        val shape = RoundedCornerShape(22.dp)
         Surface(
-            shape = MaterialTheme.shapes.large,
-            color = MaterialTheme.colorScheme.surfaceVariant,
-            shadowElevation = 6.dp,
-            modifier = Modifier.size(minOf(maxWidth, maxHeight)),
+            shape = shape,
+            color = MaterialTheme.colorScheme.surfaceContainerHigh,
+            modifier = Modifier.size(minOf(maxWidth, maxHeight)).gsPanelShadow(shape),
         ) {
-            art?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
+            if (art != null) {
+                Image(art.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop)
+            } else {
+                // No cover (or nothing playing): a note, so the square reads as a cover, not a hole.
+                Box(contentAlignment = Alignment.Center) {
+                    Icon(MediaIcons.MusicNote, null, tint = MaterialTheme.colorScheme.onSurfaceVariant, modifier = Modifier.fillMaxSize(0.35f))
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Now playing beside the big cover: the title, artist and seek bar along the top, and the
+ * controls in two rows under them, as big as the height left over allows - the transport, then
+ * like, shuffle, repeat and the app's own buttons.
+ */
+@Composable
+private fun StageControls(now: NowPlaying, media: CarMedia, modifier: Modifier) {
+    BoxWithConstraints(modifier) {
+        // Short of height (a small screen, or Extra large size), the title steps down a size.
+        val compact = maxHeight < 360.dp
+        val showTimes = maxHeight >= 260.dp
+        val titleRoom = maxHeight * 0.4f
+        Column(Modifier.fillMaxSize().padding(start = 4.dp, end = 4.dp, top = if (compact) 6.dp else 16.dp, bottom = 4.dp)) {
+            // The title gives up its height first and scrolls, so the controls keep theirs.
+            Column(Modifier.heightIn(max = titleRoom).verticalScroll(rememberScrollState())) {
+                Text(
+                    now.title.ifEmpty { stringResource(R.string.media_nothing_playing) },
+                    style = MaterialTheme.typography.displaySmall, fontWeight = FontWeight.Bold,
+                    maxLines = 2, overflow = TextOverflow.Ellipsis,
+                    autoSize = TextAutoSize.StepBased(
+                        minFontSize = if (compact) 20.sp else 22.sp,
+                        maxFontSize = MaterialTheme.typography.displaySmall.fontSize,
+                        stepSize = 2.sp,
+                    ),
+                )
+                Text(
+                    listOf(now.artist, now.album).filter { it.isNotEmpty() }.joinToString(" · "),
+                    style = MaterialTheme.typography.titleLarge, color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = 1, overflow = TextOverflow.Ellipsis,
+                    modifier = Modifier.padding(top = 4.dp),
+                )
+                now.error?.let { Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.error, maxLines = 2) }
+                if (now.title.isEmpty() && now.error == null) {
+                    Text(
+                        stringResource(R.string.media_press_play),
+                        style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            }
+            PlayerProgress(now, media, Modifier.fillMaxWidth().padding(top = if (compact) 4.dp else 12.dp), showTimes = showTimes)
+            // What's left goes to the buttons: play takes about half of it, the row below a third,
+            // and neither grows past what a row of them fits across.
+            BoxWithConstraints(Modifier.weight(1f).fillMaxWidth(), contentAlignment = Alignment.Center) {
+                val gap = (maxHeight * 0.08f).coerceIn(6.dp, 20.dp)
+                val play = minOf(maxHeight * 0.5f, maxWidth / 3.2f, 128.dp).coerceAtLeast(56.dp)
+                val mode = minOf(maxHeight * 0.32f, maxWidth / 6.5f, 80.dp).coerceAtLeast(44.dp)
+                Column(verticalArrangement = Arrangement.spacedBy(gap), horizontalAlignment = Alignment.CenterHorizontally) {
+                    TransportRow(now, media, skip = play / 1.5f, playScale = 1.5f, modifier = Modifier.fillMaxWidth())
+                    PlayModeRow(now, media, size = mode, modifier = Modifier.fillMaxWidth(), maxOther = 2)
+                }
+            }
         }
     }
 }
@@ -502,194 +737,80 @@ private fun CoverArt(art: android.graphics.Bitmap?, modifier: Modifier) {
  */
 @Composable
 private fun NowPlayingControls(now: NowPlaying, media: CarMedia, modifier: Modifier) {
-    Column(
-        modifier.verticalScroll(rememberScrollState()),
-        verticalArrangement = Arrangement.spacedBy(14.dp, Alignment.CenterVertically),
-    ) {
-        Column {
-            Text(
-                now.title.ifEmpty { "Nothing playing" },
-                style = MaterialTheme.typography.headlineMedium, fontWeight = FontWeight.Bold,
-                maxLines = 2, overflow = TextOverflow.Ellipsis,
-            )
-            Text(
-                listOf(now.artist, now.album).filter { it.isNotEmpty() }.joinToString(" - "),
-                style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.onSurfaceVariant,
-                maxLines = 1, overflow = TextOverflow.Ellipsis,
-            )
-            now.error?.let { Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.error, maxLines = 2) }
+    BoxWithConstraints(modifier) {
+        val compact = maxHeight < 360.dp || maxWidth < 420.dp
+        val showTimes = maxHeight >= 260.dp
+        Column(
+            Modifier.fillMaxSize(),
+            verticalArrangement = Arrangement.spacedBy(if (compact) 8.dp else 14.dp, Alignment.CenterVertically),
+        ) {
+            // The title gives up its height first and scrolls, so the controls never leave the screen.
+            Column(Modifier.weight(1f, fill = false).verticalScroll(rememberScrollState())) {
+                Text(
+                    now.title.ifEmpty { stringResource(R.string.media_nothing_playing) },
+                    style = MaterialTheme.typography.headlineMedium, fontWeight = FontWeight.Bold,
+                    maxLines = 2, overflow = TextOverflow.Ellipsis,
+                )
+                Text(
+                    listOf(now.artist, now.album).filter { it.isNotEmpty() }.joinToString(" - "),
+                    style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = 1, overflow = TextOverflow.Ellipsis,
+                )
+                now.error?.let { Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.error, maxLines = 2) }
+                if (now.title.isEmpty() && now.error == null) {
+                    Text(
+                        stringResource(R.string.media_press_play),
+                        style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            }
+            PlayerProgress(now, media, Modifier.fillMaxWidth(), showTimes = showTimes)
+            TransportRow(now, media, skip = if (compact) 48.dp else 60.dp, modifier = Modifier.fillMaxWidth())
+            PlayModeRow(now, media, size = if (compact) 46.dp else 56.dp, modifier = Modifier.fillMaxWidth(), maxOther = 2)
         }
-        PlayerProgress(now, media, Modifier.fillMaxWidth())
-        TransportRow(now, media, skip = 60.dp, modifier = Modifier.fillMaxWidth())
-        PlayModeRow(now, media, size = 56.dp, modifier = Modifier.fillMaxWidth(), maxOther = 2)
     }
 }
 
+/** Below these, the media app drops to one column: see [MediaScreen]. */
+private val NARROW_WIDTH = 600.dp
+private val NARROW_HEIGHT = 300.dp
+
 /**
- * The player beside the browse list, the queue and the lyrics: no art, which the list needs the
- * room for, just what's playing, the seek bar and the controls.
+ * The player beside the browse list, the queue and the lyrics: the cover as big as the controls
+ * leave room for, with the title and artist beside it rather than under it, so the cover gets the
+ * height; then the seek bar and the controls along the bottom.
  */
 @Composable
-private fun CompactPlayer(now: NowPlaying, media: CarMedia, modifier: Modifier) {
-    Column(
-        modifier.verticalScroll(rememberScrollState()),
-        verticalArrangement = Arrangement.spacedBy(14.dp),
-    ) {
-        Column {
-            Text(
-                now.title.ifEmpty { "Nothing playing" },
-                style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold,
-                maxLines = 2, overflow = TextOverflow.Ellipsis,
-            )
-            Text(
-                now.artist,
-                style = MaterialTheme.typography.bodyLarge, color = MaterialTheme.colorScheme.onSurfaceVariant,
-                maxLines = 1, overflow = TextOverflow.Ellipsis,
-            )
+private fun CompactPlayer(now: NowPlaying, media: CarMedia, art: android.graphics.Bitmap?, modifier: Modifier) {
+    Column(modifier) {
+        BoxWithConstraints(Modifier.weight(1f).fillMaxWidth()) {
+            val cover = minOf(maxHeight, maxWidth * 0.62f).coerceAtLeast(0.dp)
+            Row(Modifier.fillMaxSize(), verticalAlignment = Alignment.Bottom) {
+                CoverArt(art, Modifier.size(cover))
+                Spacer(Modifier.width(16.dp))
+                Column(Modifier.weight(1f).padding(bottom = 4.dp)) {
+                    Text(
+                        now.title.ifEmpty { stringResource(R.string.media_nothing_playing) },
+                        style = MaterialTheme.typography.titleLarge, fontWeight = FontWeight.Bold,
+                        maxLines = 3, overflow = TextOverflow.Ellipsis,
+                    )
+                    Text(
+                        now.artist,
+                        style = MaterialTheme.typography.bodyLarge, color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        maxLines = 2, overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.padding(top = 4.dp),
+                    )
+                }
+            }
         }
+        Spacer(Modifier.height(10.dp))
         PlayerProgress(now, media, Modifier.fillMaxWidth())
-        TransportRow(now, media, skip = 52.dp, modifier = Modifier.fillMaxWidth())
+        Spacer(Modifier.height(6.dp))
+        TransportRow(now, media, skip = 54.dp, modifier = Modifier.fillMaxWidth())
+        Spacer(Modifier.height(10.dp))
         PlayModeRow(now, media, size = 48.dp, modifier = Modifier.fillMaxWidth())
     }
 }
 
 // --- browsing --------------------------------------------------------------------------------
 
-@Composable
-private fun BrowsePanel(browse: app.seb3thehacker.gearslip.media.BrowseState, media: CarMedia, appLabel: String, modifier: Modifier) {
-    Column(modifier) {
-        // At the library root there's no trail and nowhere to go up to, so there's nothing this
-        // row could say that the app's name in the top-left corner hasn't already - showing it
-        // again here (as "Browse", or as the app's own name) was just the same label twice.
-        if (media.canGoUp || browse.trail.isNotEmpty()) {
-            Row(verticalAlignment = Alignment.CenterVertically) {
-                if (media.canGoUp) {
-                    GsIconButton(Icons.Filled.ArrowBack, "Up", media::up)
-                }
-                browse.trail.lastOrNull()?.let {
-                    Text(
-                        it,
-                        style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.SemiBold,
-                        maxLines = 1, overflow = TextOverflow.Ellipsis,
-                    )
-                }
-            }
-        }
-        when {
-            browse.loading -> Notice("Loading…", null)
-            browse.unavailable -> Notice(
-                "$appLabel keeps its library to itself.",
-                "Start music in the app on your phone. Play, pause, skip and seek work from here.",
-            )
-            browse.failed -> Notice("Could not load this list.", null)
-            browse.entries.isEmpty() -> Notice("Nothing here.", null)
-            else -> LazyColumn(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
-                items(browse.entries, key = { it.id }) { entry -> EntryRow(entry, media) }
-            }
-        }
-    }
-}
-
-// --- up next -----------------------------------------------------------------------------------
-
-/**
- * Whatever the app has queued up, starting right after the track that's playing now - not the
- * whole queue from the top, which would just repeat what the player beside it already shows. Apps
- * that never publish a queue (many don't) show an empty notice rather than a permanently blank tab.
- */
-@Composable
-private fun QueuePanel(queue: List<QueueTrack>, now: NowPlaying, media: CarMedia, modifier: Modifier) {
-    val upNext = remember(queue, now.activeQueueItemId) {
-        val current = queue.indexOfFirst { it.queueId == now.activeQueueItemId }
-        if (current >= 0) queue.drop(current + 1) else queue
-    }
-    Column(modifier) {
-        if (upNext.isEmpty()) {
-            Notice(
-                "Nothing queued.",
-                "${if (now.title.isEmpty()) "Nothing playing" else "Only what's already playing"} - " +
-                    "not every app tells Gearslip what comes next.",
-            )
-        } else {
-            LazyColumn(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
-                items(upNext, key = { it.queueId }) { track -> QueueRow(track, media) }
-            }
-        }
-    }
-}
-
-@Composable
-private fun QueueRow(track: QueueTrack, media: CarMedia) {
-    val context = LocalContext.current
-    val icon by produceState(track.iconBitmap, track.iconUri) {
-        value = track.iconBitmap ?: MediaArt.load(context, track.iconUri)
-    }
-    Surface(
-        onClick = { media.playQueueItem(track) },
-        shape = MaterialTheme.shapes.large,
-        color = MaterialTheme.colorScheme.surfaceVariant,
-        modifier = Modifier.fillMaxWidth(),
-    ) {
-        Row(Modifier.padding(10.dp), verticalAlignment = Alignment.CenterVertically) {
-            Box(Modifier.size(62.dp).clip(MaterialTheme.shapes.medium).background(MaterialTheme.colorScheme.surface)) {
-                icon?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
-            }
-            Column(Modifier.weight(1f).padding(horizontal = 12.dp)) {
-                Text(track.title, style = MaterialTheme.typography.titleSmall, maxLines = 1, overflow = TextOverflow.Ellipsis)
-                if (track.subtitle.isNotEmpty()) {
-                    Text(track.subtitle, style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
-                }
-            }
-            Icon(Icons.Filled.PlayArrow, "Play", tint = MaterialTheme.colorScheme.onSurfaceVariant)
-        }
-    }
-}
-
-@Composable
-private fun EntryRow(entry: MediaEntry, media: CarMedia, onClick: () -> Unit = { media.select(entry) }) {
-    val context = LocalContext.current
-    val icon by produceState(entry.iconBitmap, entry.iconUri) {
-        value = entry.iconBitmap ?: MediaArt.load(context, entry.iconUri)
-    }
-    Surface(
-        onClick = onClick,
-        shape = MaterialTheme.shapes.large,
-        color = MaterialTheme.colorScheme.surfaceVariant,
-        modifier = Modifier.fillMaxWidth(),
-    ) {
-        Row(Modifier.padding(10.dp), verticalAlignment = Alignment.CenterVertically) {
-            Box(Modifier.size(62.dp).clip(MaterialTheme.shapes.medium).background(MaterialTheme.colorScheme.surface)) {
-                icon?.let { Image(it.asImageBitmap(), null, Modifier.fillMaxSize(), contentScale = ContentScale.Crop) }
-            }
-            Column(Modifier.weight(1f).padding(horizontal = 12.dp)) {
-                Text(entry.title, style = MaterialTheme.typography.titleSmall, maxLines = 1, overflow = TextOverflow.Ellipsis)
-                if (entry.subtitle.isNotEmpty()) {
-                    Text(entry.subtitle, style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
-                }
-            }
-            if (entry.browsable && entry.playable) {
-                GsIconButton(Icons.Filled.PlayArrow, "Play", { media.playAll(entry) })
-            }
-            if (entry.browsable) Icon(Icons.AutoMirrored.Filled.KeyboardArrowRight, null)
-        }
-    }
-}
-
-/** Material's transport icons, from their published path data (they live in the extended set). */
-internal object MediaIcons {
-    val Pause = icon("Pause", "M6,19h4L10,5L6,5v14zM14,5v14h4L18,5h-4z")
-    val Next = icon("SkipNext", "M6,18l8.5,-6L6,6v12zM16,6v12h2V6h-2z")
-    /** The 3x3 app grid; not in material-icons-core. */
-    val Apps = icon("Apps", "M4,8h4L8,4L4,4v4zM10,20h4v-4h-4v4zM4,20h4v-4L4,16v4zM4,14h4v-4L4,10v4zM10,14h4v-4h-4v4zM16,4v4h4L20,4h-4zM10,8h4L14,4h-4v4zM16,14h4v-4h-4v4zM16,20h4v-4h-4v4z")
-    val Previous = icon("SkipPrevious", "M6,6h2v12L6,18zM9.5,12l8.5,6V6z")
-    val Equalizer = icon("Equalizer", "M10,20h4L14,4h-4v16zM4,20h4v-8L4,12v8zM16,9v11h4L20,9h-4z")
-    val Shuffle = icon("Shuffle", "M10.59,9.17L5.41,4 4,5.41l5.17,5.17 1.42,-1.41zM14.5,4l2.04,2.04L4,18.59 5.41,20 17.96,7.46 20,9.5L20,4h-5.5zM14.83,13.41l-1.41,1.41 3.13,3.13L14.5,20L20,20v-5.5l-2.04,2.04 -3.13,-3.13z")
-    val Repeat = icon("Repeat", "M7,7h10v3l4,-4 -4,-4v3L5,5v6h2L7,7zM17,17L7,17v-3l-4,4 4,4v-3h12v-6h-2v4z")
-    val RepeatOne = icon("RepeatOne", "M7,7h10v3l4,-4 -4,-4v3L5,5v6h2L7,7zM17,17L7,17v-3l-4,4 4,4v-3h12v-6h-2v4zM13,15L13,9h-1l-2,1v1h1.5v4L13,15z")
-    /** A screen with a filled right-hand panel: "put the player beside the map". */
-    val DockRight = icon("DockRight", "M2,4h20v16H2zM4,6h10v12H4z", PathFillType.EvenOdd)
-
-    private fun icon(name: String, path: String, fillType: PathFillType = PathFillType.NonZero) = ImageVector.Builder(
-        name, 24.dp, 24.dp, 24f, 24f,
-    ).addPath(addPathNodes(path), pathFillType = fillType, fill = SolidColor(androidx.compose.ui.graphics.Color.Black)).build()
-}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/MessagePopup.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.pluralStringResource
+import androidx.compose.ui.res.stringResource
 import android.os.SystemClock
 import androidx.compose.foundation.background
 import androidx.compose.foundation.horizontalScroll
@@ -83,9 +85,10 @@ internal fun ReplyGlyph(modifier: Modifier = Modifier) =
     Icon(ImageVector.vectorResource(R.drawable.voice_selection_24), null, modifier)
 
 /** "Alex", or "Alex · 3 new" when a burst of messages from one chat has been merged. */
+@Composable
 private fun CarNotification.heading(): String {
     val who = title.ifBlank { appLabel }
-    return if (burst > 1) "$who · $burst new" else who
+    return if (burst > 1) pluralStringResource(R.plurals.msg_burst, burst, who, burst) else who
 }
 
 /** The card. It shows the voice reply too, wherever that was started from. */
@@ -106,17 +109,17 @@ fun NotificationPopup(showNew: Boolean, modifier: Modifier = Modifier) {
                 Text(n.heading(), style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold, maxLines = 1, overflow = TextOverflow.Ellipsis)
                 Text(n.text, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
             }
-            GsIconButton(Icons.Filled.Close, "Dismiss", { CarNotifications.dismissPopup(n.id) }, size = 40.dp, iconSize = 20.dp)
+            GsIconButton(Icons.Filled.Close, stringResource(R.string.msg_dismiss), { CarNotifications.dismissPopup(n.id) }, size = 40.dp, iconSize = 20.dp)
         }
         Row(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
             GsButton(onClick = { VoiceReply.read(n) }, tone = GsTone.Neutral, modifier = Modifier.weight(1f)) {
                 ReadGlyph(Modifier.size(20.dp))
-                Text("Read", Modifier.padding(start = 8.dp))
+                Text(stringResource(R.string.msg_read), Modifier.padding(start = 8.dp))
             }
             if (n.reply != null) {
                 GsButton(onClick = { VoiceReply.reply(n) }, modifier = Modifier.weight(1f)) {
                     ReplyGlyph(Modifier.size(20.dp))
-                    Text("Reply", Modifier.padding(start = 8.dp))
+                    Text(stringResource(R.string.crumb_reply), Modifier.padding(start = 8.dp))
                 }
             }
         }
@@ -191,36 +194,36 @@ private fun VoiceReplyBody(s: VoiceReply.State, n: CarNotification) {
         when (s.phase) {
             VoiceReply.Phase.READING, VoiceReply.Phase.READ -> {
                 GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) {
-                    Text(if (s.phase == VoiceReply.Phase.READING) "Stop" else "Close")
+                    Text(if (s.phase == VoiceReply.Phase.READING) stringResource(R.string.msg_stop) else stringResource(R.string.close))
                 }
                 if (n.reply != null) {
                     GsButton(onClick = { VoiceReply.reply(n, readFirst = false) }, modifier = wide) {
                         ReplyGlyph(Modifier.size(20.dp))
-                        Text("Reply", Modifier.padding(start = 8.dp))
+                        Text(stringResource(R.string.crumb_reply), Modifier.padding(start = 8.dp))
                     }
                 }
             }
             VoiceReply.Phase.OFFERING -> {
-                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("No") }
+                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text(stringResource(R.string.msg_no)) }
                 GsButton(onClick = { VoiceReply.reply(n, readFirst = false) }, modifier = wide) {
                     ReplyGlyph(Modifier.size(20.dp))
-                    Text("Reply", Modifier.padding(start = 8.dp))
+                    Text(stringResource(R.string.crumb_reply), Modifier.padding(start = 8.dp))
                 }
             }
             VoiceReply.Phase.ASKING, VoiceReply.Phase.LISTENING ->
-                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("Cancel") }
+                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text(stringResource(R.string.cancel)) }
             VoiceReply.Phase.CONFIRMING -> {
-                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("Cancel") }
-                GsButton(onClick = VoiceReply::sendNow, modifier = wide) { Text("Send now") }
+                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text(stringResource(R.string.cancel)) }
+                GsButton(onClick = VoiceReply::sendNow, modifier = wide) { Text(stringResource(R.string.msg_send_now)) }
             }
             VoiceReply.Phase.ERROR -> {
-                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text("Close") }
+                GsButton(onClick = VoiceReply::cancel, tone = GsTone.Neutral, modifier = wide) { Text(stringResource(R.string.close)) }
                 if (n.reply != null) {
-                    GsButton(onClick = { VoiceReply.reply(n, readFirst = false) }, tone = GsTone.Tonal, modifier = wide) { Text("Try again") }
+                    GsButton(onClick = { VoiceReply.reply(n, readFirst = false) }, tone = GsTone.Tonal, modifier = wide) { Text(stringResource(R.string.update_try_again)) }
                     GsButton(
                         onClick = { VoiceReply.cancel(); navigator.notifications(replyTo = n.key) },
                         tone = GsTone.Neutral, modifier = wide,
-                    ) { Text("Type") }
+                    ) { Text(stringResource(R.string.msg_type)) }
                 }
             }
             VoiceReply.Phase.SENT, VoiceReply.Phase.IDLE -> Unit
@@ -228,13 +231,14 @@ private fun VoiceReplyBody(s: VoiceReply.State, n: CarNotification) {
     }
 }
 
+@Composable
 private fun voiceHeading(s: VoiceReply.State, who: String): String = when (s.phase) {
     VoiceReply.Phase.READING, VoiceReply.Phase.READ -> who
-    VoiceReply.Phase.OFFERING, VoiceReply.Phase.ASKING -> "Reply to $who"
-    VoiceReply.Phase.LISTENING -> "Listening"
-    VoiceReply.Phase.CONFIRMING -> "Sending to $who"
-    VoiceReply.Phase.SENT -> "Sent to $who"
-    VoiceReply.Phase.ERROR -> "Couldn't reply"
+    VoiceReply.Phase.OFFERING, VoiceReply.Phase.ASKING -> stringResource(R.string.msg_reply_to, who)
+    VoiceReply.Phase.LISTENING -> stringResource(R.string.msg_listening)
+    VoiceReply.Phase.CONFIRMING -> stringResource(R.string.msg_sending_to, who)
+    VoiceReply.Phase.SENT -> stringResource(R.string.msg_sent_to, who)
+    VoiceReply.Phase.ERROR -> stringResource(R.string.msg_reply_failed)
     VoiceReply.Phase.IDLE -> ""
 }
 

gearslip/src/main/java/app/seb3thehacker/gearslip/car/MessagesScreen.kt

@@ -1,5 +1,8 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.pluralStringResource
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import android.content.Intent
 import android.provider.Settings
@@ -8,6 +11,8 @@ import androidx.compose.foundation.Image
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
@@ -60,14 +65,14 @@ fun MessagesScreen(packageName: String) {
     val navigator = LocalCarNavigator.current
     val context = LocalContext.current.applicationContext
     val entry = remember(packageName) { findEntry(MESSAGING_PREFIX + packageName) }
-    val label = entry?.label ?: history.firstOrNull { it.packageName == packageName }?.appLabel ?: "Messages"
+    val label = entry?.label ?: history.firstOrNull { it.packageName == packageName }?.appLabel ?: stringResource(R.string.msg_messages)
     val threads = history.filter { it.packageName == packageName }
 
     LaunchedEffect(history) { CarNotifications.dismissPopupFrom(packageName) }
 
-    Column(Modifier.fillMaxSize().padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
+    Column(Modifier.fillMaxSize().padding(start = 16.dp, end = 16.dp, top = 16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
         Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-            GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, "Back", navigator::back)
+            GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, stringResource(R.string.back), navigator::back)
             entry?.icon?.let { Image(it, contentDescription = null, modifier = Modifier.size(36.dp).clip(RoundedCornerShape(8.dp))) }
             Text(label, style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
         }
@@ -82,7 +87,7 @@ fun MessagesScreen(packageName: String) {
 
         if (threads.isEmpty()) {
             Text(
-                "No recent messages. New $label messages appear here as they arrive on the phone.",
+                stringResource(R.string.msg_none_recent, label),
                 style = MaterialTheme.typography.bodyLarge,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
@@ -104,6 +109,7 @@ fun MessagesScreen(packageName: String) {
     }
 }
 
+@OptIn(ExperimentalLayoutApi::class)
 @Composable
 private fun ConversationCard(n: CarNotification, onRead: () -> Unit, onReply: () -> Unit, onMarkRead: () -> Unit) {
     var expanded by rememberSaveable(n.key) { mutableStateOf(false) }
@@ -143,40 +149,48 @@ private fun ConversationCard(n: CarNotification, onRead: () -> Unit, onReply: ()
                         color = MaterialTheme.colorScheme.onSurfaceVariant,
                         maxLines = 1,
                     )
+                    if (n.replied) {
+                        Icon(
+                            Icons.Filled.Check,
+                            contentDescription = stringResource(R.string.notif_replied),
+                            tint = MaterialTheme.colorScheme.primary,
+                            modifier = Modifier.padding(start = 8.dp).size(20.dp),
+                        )
+                    }
                 }
                 if (!expanded && lines.size > COLLAPSED_LINES) {
                     Text(
-                        "${lines.size - COLLAPSED_LINES} earlier",
+                        pluralStringResource(R.plurals.msg_earlier, lines.size - COLLAPSED_LINES, lines.size - COLLAPSED_LINES),
                         style = MaterialTheme.typography.labelMedium,
                         color = MaterialTheme.colorScheme.primary,
                     )
                 }
                 shown.forEach { MessageLine(it, showSender = n.isGroup) }
+                // Below the messages and side by side, so the text keeps the card's whole width.
+                FlowRow(
+                    Modifier.padding(top = 6.dp),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                    verticalArrangement = Arrangement.spacedBy(8.dp),
+                ) {
+                    GsButton(onClick = onRead, tone = GsTone.Neutral) {
+                        ReadGlyph(Modifier.size(20.dp))
+                        Text(stringResource(R.string.msg_read), Modifier.padding(start = 8.dp))
+                    }
+                    if (n.reply != null) {
+                        GsButton(onClick = onReply, tone = GsTone.Tonal) {
+                            ReplyGlyph(Modifier.size(20.dp))
+                            Text(stringResource(R.string.crumb_reply), Modifier.padding(start = 8.dp))
+                        }
+                        GsButton(onClick = { quick = !quick }, tone = GsTone.Neutral) {
+                            Text(stringResource(if (quick) R.string.msg_hide_quick else R.string.msg_quick))
+                        }
+                    }
+                    if (n.markRead != null) {
+                        GsButton(onClick = onMarkRead, tone = GsTone.Neutral) { Text(stringResource(R.string.msg_mark_read)) }
+                    }
+                }
                 if (quick) QuickReplies(n, Modifier.padding(top = 6.dp))
             }
-            Column(horizontalAlignment = Alignment.End, verticalArrangement = Arrangement.spacedBy(8.dp)) {
-                if (n.replied) {
-                    Icon(Icons.Filled.Check, contentDescription = "Replied", tint = MaterialTheme.colorScheme.primary)
-                }
-                GsButton(onClick = onRead, tone = GsTone.Neutral) {
-                    ReadGlyph(Modifier.size(20.dp))
-                    Text("Read", Modifier.padding(start = 8.dp))
-                }
-                if (n.reply != null) {
-                    GsButton(onClick = onReply, tone = GsTone.Tonal) {
-                        ReplyGlyph(Modifier.size(20.dp))
-                        Text("Reply", Modifier.padding(start = 8.dp))
-                    }
-                }
-                if (n.reply != null) {
-                    GsButton(onClick = { quick = !quick }, tone = GsTone.Neutral) {
-                        Text(if (quick) "Hide quick replies" else "Quick reply")
-                    }
-                }
-                if (n.markRead != null) {
-                    GsButton(onClick = onMarkRead, tone = GsTone.Neutral) { Text("Mark read") }
-                }
-            }
         }
     }
 }
@@ -184,8 +198,8 @@ private fun ConversationCard(n: CarNotification, onRead: () -> Unit, onReply: ()
 @Composable
 private fun MessageLine(line: ChatLine, showSender: Boolean) {
     val who = when {
-        line.sender == null -> "You: "
-        showSender -> "${line.sender}: "
+        line.sender == null -> stringResource(R.string.msg_you)
+        showSender -> stringResource(R.string.msg_sender, line.sender)
         else -> ""
     }
     Text(

gearslip/src/main/java/app/seb3thehacker/gearslip/car/NavApps.kt

@@ -1,5 +1,8 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.annotation.StringRes
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
@@ -16,6 +19,7 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.List
 import androidx.compose.material.icons.filled.Call
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material.icons.filled.Search
@@ -65,26 +69,49 @@ private val CarGlyph: ImageVector = ImageVector.Builder("Car", 24.dp, 24.dp, 24f
  */
 internal class BuiltInApp(
     val id: String,
+    /** English, for matching what a driver says; [labelRes] is what the screen shows. */
     val label: String,
+    @param:StringRes val labelRes: Int,
     val glyph: ImageVector,
     val screen: CarScreen?,
     val open: (CarNavigator) -> Unit,
 )
 
 internal object BuiltInApps {
-    val Web = BuiltInApp("web", "Browser", Icons.Filled.Search, CarScreen.App("web")) { it.open("web") }
-    val ScreenSharing = BuiltInApp("phone", "Screen sharing", Icons.Filled.Share, CarScreen.App("phone")) { it.open("phone") }
-    val Phone = BuiltInApp("dialer", "Phone", Icons.Filled.Call, CarScreen.App("dialer")) { it.open("dialer") }
-    val VehicleData = BuiltInApp("vehicle", "Vehicle data", Icons.Filled.Info, CarScreen.VehicleData) { it.vehicleData() }
-    val Settings = BuiltInApp("settings", "Settings", Icons.Filled.Settings, CarScreen.Settings) { it.settings() }
+    val Web = BuiltInApp("web", "Browser", R.string.app_browser, Icons.Filled.Search, CarScreen.App("web")) { it.open("web") }
+    val ScreenSharing = BuiltInApp("phone", "Screen sharing", R.string.app_screen_sharing, Icons.Filled.Share, CarScreen.App("phone")) { it.open("phone") }
+    val Phone = BuiltInApp("dialer", "Phone", R.string.carset_phone, Icons.Filled.Call, CarScreen.App("dialer")) { it.open("dialer") }
+    val VehicleData = BuiltInApp("vehicle", "Vehicle data", R.string.car_vehicle_data, Icons.Filled.Info, CarScreen.VehicleData) { it.vehicleData() }
+    val Settings = BuiltInApp("settings", "Settings", R.string.settings_title, Icons.Filled.Settings, CarScreen.Settings) { it.settings() }
+
+    /** Launcher mode only: every app on the device, opened full screen. */
+    val AllApps = BuiltInApp("allapps", "All apps", R.string.app_all_apps, Icons.Filled.List, CarScreen.App("allapps")) { it.open("allapps") }
 
     /** Hands the screen back to the car's own interface, like Android Auto's Exit. */
-    val Exit = BuiltInApp("exit", "Exit", CarGlyph, screen = null) { CarFocus.exitToCar() }
+    val Exit = BuiltInApp("exit", "Exit", R.string.app_exit, CarGlyph, screen = null) { CarFocus.exitToCar() }
 
-    val all = listOf(Web, ScreenSharing, Phone, VehicleData, Settings, Exit)
-    val entries: List<Entry> = all.map { Entry(it.label, icon = null, builtIn = it) }
+    val all = listOf(Web, ScreenSharing, Phone, VehicleData, Settings, Exit, AllApps)
+    private val byApp = all.associateWith { Entry(it.label, icon = null, builtIn = it) }
+    val everyEntry: List<Entry> = byApp.values.toList()
+
+    /**
+     * The ones that make sense where the car UI is showing. As a device's own home screen there
+     * is no car to share the screen with or exit to, and no phone line on most head units.
+     */
+    fun entries(launcher: Boolean, canCall: Boolean): List<Entry> = byApp.filterKeys { app ->
+        when (app) {
+            AllApps -> launcher
+            ScreenSharing, Exit -> !launcher
+            Phone -> !launcher || canCall
+            else -> true
+        }
+    }.values.toList()
 }
 
+/** The name a driver sees: translated for Gearslip's own apps, the app's own name otherwise. */
+@Composable
+internal fun Entry.shownLabel(): String = builtIn?.let { stringResource(it.labelRes) } ?: label
+
 /** Vehicle data is experimental: raw, unverified sensor labels (see [CarSensors]). */
 @Composable
 internal fun rememberVehicleDataShown(): Boolean {
@@ -215,7 +242,7 @@ internal fun AppMenu(navigator: CarNavigator, running: Map<String, RunningSlot>)
                     entry.icon?.let { Image(it, null, Modifier.size(44.dp).clip(RoundedCornerShape(10.dp))) }
                     entry.builtIn?.let { Icon(it.glyph, null, Modifier.size(36.dp)) }
                     Text(
-                        entry.label,
+                        entry.shownLabel(),
                         style = MaterialTheme.typography.titleLarge,
                         fontWeight = FontWeight.SemiBold,
                         modifier = Modifier.padding(start = 14.dp),
@@ -232,9 +259,9 @@ internal fun AppMenu(navigator: CarNavigator, running: Map<String, RunningSlot>)
                 ) {
                     Text(
                         when {
-                            isPinned -> "Unpin from nav bar"
-                            barFull -> "Nav bar is full (${CarSettings.MAX_PINNED} pinned)"
-                            else -> "Pin to nav bar"
+                            isPinned -> stringResource(R.string.navapps_unpin)
+                            barFull -> stringResource(R.string.navapps_full, CarSettings.MAX_PINNED)
+                            else -> stringResource(R.string.navapps_pin)
                         },
                         style = MaterialTheme.typography.titleMedium,
                     )
@@ -248,13 +275,13 @@ internal fun AppMenu(navigator: CarNavigator, running: Map<String, RunningSlot>)
                         },
                         tone = GsTone.Danger,
                         modifier = Modifier.fillMaxWidth().height(56.dp),
-                    ) { Text("Close app", style = MaterialTheme.typography.titleMedium) }
+                    ) { Text(stringResource(R.string.navapps_close), style = MaterialTheme.typography.titleMedium) }
                 }
                 GsButton(
                     onClick = navigator::dismissAppMenu,
                     tone = GsTone.Neutral,
                     modifier = Modifier.fillMaxWidth().height(56.dp),
-                ) { Text("Cancel", style = MaterialTheme.typography.titleMedium) }
+                ) { Text(stringResource(R.string.cancel), style = MaterialTheme.typography.titleMedium) }
             }
         }
     }
@@ -267,7 +294,8 @@ internal fun AppMenu(navigator: CarNavigator, running: Map<String, RunningSlot>)
 @Composable
 private fun MoveButtons(id: String) {
     val custom by CarSettings.appOrder.collectAsState()
-    val order = launcherOrder(rememberAllEntries(), rememberVehicleDataShown(), custom).mapNotNull { it.componentId }
+    val hidden by CarSettings.hiddenApps.collectAsState()
+    val order = launcherOrder(rememberAllEntries(), rememberVehicleDataShown(), custom, hidden).mapNotNull { it.componentId }
     val index = order.indexOf(id)
     if (index < 0) return
     fun move(by: Int) {
@@ -281,19 +309,19 @@ private fun MoveButtons(id: String) {
             tone = GsTone.Tonal,
             enabled = index > 0,
             modifier = Modifier.weight(1f).height(56.dp),
-        ) { Text("Move left", style = MaterialTheme.typography.titleMedium) }
+        ) { Text(stringResource(R.string.navapps_move_left), style = MaterialTheme.typography.titleMedium) }
         GsButton(
             onClick = { move(1) },
             tone = GsTone.Tonal,
             enabled = index < order.lastIndex,
             modifier = Modifier.weight(1f).height(56.dp),
-        ) { Text("Move right", style = MaterialTheme.typography.titleMedium) }
+        ) { Text(stringResource(R.string.navapps_move_right), style = MaterialTheme.typography.titleMedium) }
     }
     if (custom.isNotEmpty()) {
         GsButton(
             onClick = { CarSettings.setAppOrder(emptyList()) },
             tone = GsTone.Neutral,
             modifier = Modifier.fillMaxWidth().height(56.dp),
-        ) { Text("Reset app order", style = MaterialTheme.typography.titleMedium) }
+        ) { Text(stringResource(R.string.navapps_reset), style = MaterialTheme.typography.titleMedium) }
     }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/NotificationsScreen.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import android.content.Intent
 import android.provider.Settings
@@ -79,12 +81,12 @@ fun NotificationsSection() {
     Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
         Row(verticalAlignment = Alignment.CenterVertically) {
             Text(
-                "Notifications",
+                stringResource(R.string.notif_title),
                 style = MaterialTheme.typography.titleMedium,
                 color = MaterialTheme.colorScheme.primary,
                 modifier = Modifier.weight(1f),
             )
-            if (history.isNotEmpty()) TextButton(onClick = CarNotifications::clear) { Text("Clear all") }
+            if (history.isNotEmpty()) TextButton(onClick = CarNotifications::clear) { Text(stringResource(R.string.notif_clear_all)) }
         }
 
         if (!listening) {
@@ -97,7 +99,7 @@ fun NotificationsSection() {
 
         if (history.isEmpty()) {
             Text(
-                "Nothing yet. New notifications from the phone will show up here.",
+                stringResource(R.string.notif_empty),
                 style = MaterialTheme.typography.bodyMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
@@ -124,11 +126,11 @@ internal fun AccessBanner(onOpen: () -> Unit) {
         ) {
             Icon(Icons.Filled.Warning, contentDescription = null)
             Text(
-                "Notifications are off. Allow Gearslip under Settings > Notifications > Notification access on the phone.",
+                stringResource(R.string.notif_off),
                 style = MaterialTheme.typography.bodyMedium,
                 modifier = Modifier.weight(1f),
             )
-            GsButton(onClick = onOpen) { Text("Open") }
+            GsButton(onClick = onOpen) { Text(stringResource(R.string.guide_open)) }
         }
     }
 }
@@ -160,10 +162,10 @@ private fun NotificationRow(n: CarNotification, onReply: (CarNotification) -> Un
                 }
             }
             when {
-                n.replied -> Icon(Icons.Filled.Check, contentDescription = "Replied", tint = MaterialTheme.colorScheme.primary)
+                n.replied -> Icon(Icons.Filled.Check, contentDescription = stringResource(R.string.notif_replied), tint = MaterialTheme.colorScheme.primary)
                 n.reply != null -> GsButton(onClick = { VoiceReply.reply(n) }, tone = GsTone.Tonal) {
                     ReplyGlyph(Modifier.size(20.dp))
-                    Text("Reply", Modifier.padding(start = 8.dp))
+                    Text(stringResource(R.string.crumb_reply), Modifier.padding(start = 8.dp))
                 }
             }
         }
@@ -198,14 +200,14 @@ private fun ReplyPane(n: CarNotification, onDone: () -> Unit) {
             verticalAlignment = Alignment.CenterVertically,
             horizontalArrangement = Arrangement.spacedBy(8.dp),
         ) {
-            GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, "Back", onDone)
+            GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, stringResource(R.string.back), onDone)
             Surface(
                 shape = RoundedCornerShape(24.dp),
                 color = MaterialTheme.colorScheme.surfaceContainerHighest,
                 modifier = Modifier.weight(1f),
             ) {
                 Text(
-                    if (text.isEmpty()) "Reply to ${n.title.ifBlank { n.appLabel }}" else "$text|",
+                    if (text.isEmpty()) stringResource(R.string.msg_reply_to, n.title.ifBlank { n.appLabel }) else "$text|",
                     color = if (text.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis,

gearslip/src/main/java/app/seb3thehacker/gearslip/car/PhoneAppsScreen.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.layout.Arrangement
@@ -52,8 +54,8 @@ fun PhoneAppsScreen() {
         value = PhoneApps.cached() ?: withContext(Dispatchers.IO) { PhoneApps.installed(context).also { PhoneApps.warm(context) } }
     }
 
-    Column(Modifier.fillMaxSize().padding(horizontal = 20.dp, vertical = 12.dp)) {
-        ScreenHeader("Screen sharing")
+    Column(Modifier.fillMaxSize().padding(start = 20.dp, end = 20.dp, top = 12.dp)) {
+        ScreenHeader(stringResource(R.string.app_screen_sharing))
         Spacer(Modifier.height(12.dp))
         if (!TouchRelayService.enabled) {
             TouchRelayWarning()
@@ -63,7 +65,7 @@ fun PhoneAppsScreen() {
         LazyVerticalGrid(
             columns = GridCells.Adaptive(minSize = 108.dp),
             modifier = Modifier.fillMaxSize(),
-            contentPadding = PaddingValues(bottom = 8.dp),
+            contentPadding = PaddingValues(bottom = 16.dp),
             horizontalArrangement = Arrangement.spacedBy(12.dp),
             verticalArrangement = Arrangement.spacedBy(12.dp),
         ) {
@@ -94,17 +96,17 @@ private fun TouchRelayWarning() {
         ) {
             Icon(Icons.Filled.Warning, contentDescription = null)
             Text(
-                "Touch is off. Enable Gearslip under Settings > Accessibility on the phone.",
+                stringResource(R.string.phoneapps_touch_off),
                 style = MaterialTheme.typography.bodyMedium,
                 modifier = Modifier.weight(1f),
             )
-            GsButton(onClick = { PhoneApps.openAccessibilitySettings(context) }) { Text("Open") }
+            GsButton(onClick = { PhoneApps.openAccessibilitySettings(context) }) { Text(stringResource(R.string.guide_open)) }
         }
     }
 }
 
 @Composable
-private fun PhoneAppTile(app: PhoneApp, onClick: () -> Unit) {
+internal fun PhoneAppTile(app: PhoneApp, onClick: () -> Unit) {
     GsIconBox(
         onClick = onClick,
         modifier = Modifier.height(120.dp),

gearslip/src/main/java/app/seb3thehacker/gearslip/car/PhoneDialerScreen.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import android.Manifest
 import android.content.Context
@@ -8,9 +10,11 @@ import android.content.pm.PackageManager
 import android.net.Uri
 import android.provider.ContactsContract
 import android.provider.Settings
+import app.seb3thehacker.gearslip.GearslipLog
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -80,14 +84,24 @@ internal fun loadContacts(context: Context): List<Contact> {
     return out.distinctBy { it.number }
 }
 
+/**
+ * Places the call through Telecom directly. Starting ACTION_CALL from here launched the system's
+ * call activity onto the car's display, which Android refuses for another app's activity, and
+ * from the background, which it blocks too - so the call never went out.
+ */
 internal fun placeCall(context: Context, number: String) {
     if (number.isBlank()) return
-    if (context.checkSelfPermission(Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) return
-    runCatching {
-        context.startActivity(
-            Intent(Intent.ACTION_CALL, Uri.parse("tel:${Uri.encode(number)}")).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
-        )
+    if (context.checkSelfPermission(Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
+        GearslipLog.w("calls: can't place a call without CALL_PHONE")
+        return
     }
+    val telecom = context.getSystemService(android.telecom.TelecomManager::class.java)
+    runCatching { telecom!!.placeCall(Uri.fromParts("tel", number, null), null) }
+        .onSuccess {
+            GearslipLog.i("calls: placing a call")
+            app.seb3thehacker.gearslip.call.CarCalls.outgoingCall(context, number)
+        }
+        .onFailure { GearslipLog.w("calls: placing a call failed: ${it.message}") }
 }
 
 /** A call another car screen wants to place - a number on a place page - waiting on the driver. */
@@ -122,45 +136,48 @@ private const val TAB_KEYPAD = 1
 @Composable
 fun PhoneDialerScreen() {
     val context = LocalContext.current
-    val hasPermissions = hasCallPermissions(context)
+    var hasPermissions by remember { mutableStateOf(hasCallPermissions(context)) }
     var tab by remember { mutableStateOf(TAB_CONTACTS) }
 
-    Column(Modifier.fillMaxSize().padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
+    Column(Modifier.fillMaxSize().padding(start = 16.dp, end = 16.dp, top = 16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
         // The tabs share the title's row, so the list and keypad get the height back.
-        ScreenHeader("Phone") {
+        ScreenHeader(stringResource(R.string.carset_phone)) {
             if (hasPermissions) {
                 Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
-                    DialerTab("Contacts", tab == TAB_CONTACTS, Modifier.width(140.dp)) { tab = TAB_CONTACTS }
-                    DialerTab("Keypad", tab == TAB_KEYPAD, Modifier.width(140.dp)) { tab = TAB_KEYPAD }
+                    DialerTab(stringResource(R.string.dialer_contacts), tab == TAB_CONTACTS, Modifier.width(140.dp)) { tab = TAB_CONTACTS }
+                    DialerTab(stringResource(R.string.dialer_keypad), tab == TAB_KEYPAD, Modifier.width(140.dp)) { tab = TAB_KEYPAD }
                 }
             }
         }
 
         if (!hasPermissions) {
-            MissingPermission(context)
+            MissingPermission(context) { hasPermissions = true }
             return@Column
         }
 
         Box(Modifier.weight(1f).fillMaxWidth()) {
-            if (tab == TAB_CONTACTS) ContactsList(context) else Keypad(context)
+            if (tab == TAB_CONTACTS) ContactsList(context) else Box(Modifier.padding(bottom = 16.dp)) { Keypad(context) }
         }
     }
 }
 
 @Composable
-private fun MissingPermission(context: Context) {
+private fun MissingPermission(context: Context, onGranted: () -> Unit) {
+    // Android's dialog can't show on the car screen, so it opens on the phone; checking again
+    // every second picks the answer up without the driver having to come back in.
+    androidx.compose.runtime.LaunchedEffect(Unit) {
+        while (!hasCallPermissions(context)) kotlinx.coroutines.delay(1_000)
+        onGranted()
+    }
     Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
         Text(
-            "Gearslip needs the Phone and Contacts permissions to dial from here. Grant them " +
-                "from the app's settings.",
+            stringResource(R.string.dialer_needs_permission),
             style = MaterialTheme.typography.bodyLarge,
             color = MaterialTheme.colorScheme.onSurfaceVariant,
         )
         GsButton(tone = GsTone.Tonal, onClick = {
-            context.startActivity(
-                Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.fromParts("package", context.packageName, null)),
-            )
-        }) { Text("Open app settings") }
+            app.seb3thehacker.gearslip.PermissionActivity.ask(context, CALL_PERMISSIONS)
+        }) { Text(stringResource(R.string.dialer_ask)) }
     }
 }
 
@@ -196,7 +213,7 @@ private fun Keypad(context: Context) {
 
     Column(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(12.dp)) {
         Text(
-            number.ifEmpty { "Enter a number" },
+            number.ifEmpty { stringResource(R.string.dialer_enter_number) },
             style = MaterialTheme.typography.headlineSmall,
             color = if (number.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
             maxLines = 1,
@@ -225,7 +242,7 @@ private fun Keypad(context: Context) {
                     colors = gsColors(GsTone.Primary),
                     enabled = number.isNotEmpty(),
                     modifier = Modifier.weight(1f).fillMaxWidth(),
-                ) { Icon(Icons.Filled.Call, "Call") }
+                ) { Icon(Icons.Filled.Call, stringResource(R.string.dialer_call)) }
             }
         }
     }
@@ -267,16 +284,16 @@ private fun ContactsList(context: Context) {
         Box(Modifier.weight(1f).fillMaxWidth()) {
             when {
                 contacts.isEmpty() -> Text(
-                    "No contacts with a phone number found.",
+                    stringResource(R.string.dialer_no_contacts),
                     style = MaterialTheme.typography.bodyLarge,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
                 filtered.isEmpty() -> Text(
-                    "No contacts match \"$query\".",
+                    stringResource(R.string.dialer_no_match, query),
                     style = MaterialTheme.typography.bodyLarge,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
-                else -> LazyColumn(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                else -> LazyColumn(Modifier.fillMaxSize(), contentPadding = PaddingValues(bottom = 16.dp), verticalArrangement = Arrangement.spacedBy(8.dp)) {
                     items(filtered) { contact ->
                         ContactRow(contact) { pendingCall = contact }
                     }
@@ -329,14 +346,14 @@ private fun ConfirmCallOverlay(contact: Contact, onConfirm: () -> Unit, onDismis
                 verticalArrangement = Arrangement.spacedBy(20.dp),
                 horizontalAlignment = Alignment.CenterHorizontally,
             ) {
-                Text("Call ${contact.name}?", style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
+                Text(stringResource(R.string.dialer_call_who, contact.name), style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
                 Text(contact.number, style = MaterialTheme.typography.titleLarge, color = MaterialTheme.colorScheme.onSurfaceVariant)
                 Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(16.dp)) {
                     GsButton(onClick = onDismiss, tone = GsTone.Outline, modifier = Modifier.weight(1f).height(56.dp)) {
-                        Text("Cancel", style = MaterialTheme.typography.titleMedium)
+                        Text(stringResource(R.string.cancel), style = MaterialTheme.typography.titleMedium)
                     }
                     GsButton(onClick = onConfirm, modifier = Modifier.weight(1f).height(56.dp)) {
-                        Text("Call", style = MaterialTheme.typography.titleMedium)
+                        Text(stringResource(R.string.dialer_call), style = MaterialTheme.typography.titleMedium)
                     }
                 }
             }
@@ -353,7 +370,7 @@ private fun ContactSearchField(query: String, active: Boolean, onToggle: () -> U
         modifier = Modifier.fillMaxWidth(),
     ) {
         Text(
-            query.ifEmpty { "Search contacts" },
+            query.ifEmpty { stringResource(R.string.dialer_search) },
             style = MaterialTheme.typography.bodyLarge,
             color = if (query.isEmpty()) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
             maxLines = 1,
@@ -391,7 +408,7 @@ private fun ContactRow(contact: Contact, onClick: () -> Unit) {
                 Text(contact.name, style = MaterialTheme.typography.titleMedium, maxLines = 1, overflow = TextOverflow.Ellipsis)
                 Text(contact.number, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
             }
-            Icon(Icons.Filled.Call, contentDescription = "Call", tint = MaterialTheme.colorScheme.primary)
+            Icon(Icons.Filled.Call, contentDescription = stringResource(R.string.dialer_call), tint = MaterialTheme.colorScheme.primary)
         }
     }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/PlayerParts.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import android.media.session.PlaybackState
 import android.support.v4.media.session.PlaybackStateCompat
 import androidx.compose.foundation.layout.Arrangement
@@ -94,23 +96,23 @@ internal fun formatDuration(ms: Long): String {
     return if (hours > 0) "%d:%02d:%02d".format(hours, minutes, seconds) else "%d:%02d".format(minutes, seconds)
 }
 
-/** Previous, play/pause, next. [skip] sizes the outer two; play is a step bigger. */
+/** Previous, play/pause, next. [skip] sizes the outer two; play is [playScale] times bigger. */
 @Composable
-internal fun TransportRow(now: NowPlaying, media: CarMedia, skip: Dp, modifier: Modifier = Modifier) {
-    val play = skip * 1.25f
+internal fun TransportRow(now: NowPlaying, media: CarMedia, skip: Dp, modifier: Modifier = Modifier, playScale: Float = 1.25f) {
+    val play = skip * playScale
     Row(modifier, horizontalArrangement = Arrangement.SpaceEvenly, verticalAlignment = Alignment.CenterVertically) {
         GsIconButton(
-            MediaIcons.Previous, "Previous", media::previous,
+            MediaIcons.Previous, stringResource(R.string.player_previous), media::previous,
             enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_PREVIOUS), size = skip, iconSize = skip * 0.58f, shape = CircleShape,
         )
         GsIconButton(
             if (now.playing) MediaIcons.Pause else Icons.Filled.PlayArrow,
-            if (now.playing) "Pause" else "Play",
+            stringResource(if (now.playing) R.string.player_pause else R.string.media_play),
             media::togglePlay,
             tone = GsTone.Primary, size = play, iconSize = play * 0.58f, shape = CircleShape,
         )
         GsIconButton(
-            MediaIcons.Next, "Next", media::next,
+            MediaIcons.Next, stringResource(R.string.player_next), media::next,
             enabled = now.canDo(PlaybackState.ACTION_SKIP_TO_NEXT), size = skip, iconSize = skip * 0.58f, shape = CircleShape,
         )
     }
@@ -147,7 +149,7 @@ internal fun PlayModeRow(
         } else {
             GsIconButton(
                 if (liked == true) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder,
-                if (liked == true) "Unlike" else "Like",
+                stringResource(if (liked == true) R.string.player_unlike else R.string.player_like),
                 media::toggleLike,
                 enabled = liked != null,
                 tone = if (liked == true) GsTone.Primary else GsTone.Neutral,
@@ -159,7 +161,7 @@ internal fun PlayModeRow(
             CustomActionButton(shuffleAction, media, size, toggle = true)
         } else {
             GsIconButton(
-                MediaIcons.Shuffle, if (shuffleOn) "Shuffle off" else "Shuffle on",
+                MediaIcons.Shuffle, stringResource(if (shuffleOn) R.string.player_shuffle_off else R.string.player_shuffle_on),
                 media::toggleShuffle,
                 enabled = shuffleKnown,
                 tone = if (shuffleOn) GsTone.Primary else GsTone.Neutral,
@@ -172,7 +174,7 @@ internal fun PlayModeRow(
         } else {
             GsIconButton(
                 if (modes.repeat == PlaybackStateCompat.REPEAT_MODE_ONE) MediaIcons.RepeatOne else MediaIcons.Repeat,
-                "Repeat",
+                stringResource(R.string.player_repeat),
                 media::cycleRepeat,
                 enabled = repeatKnown,
                 tone = if (repeatOn) GsTone.Primary else GsTone.Neutral,
@@ -229,26 +231,48 @@ internal fun rememberArt(now: NowPlaying): android.graphics.Bitmap? {
 }
 
 /**
- * A background taken from the album art's main colour, in place of [fallback]. Only the hue and a
- * capped amount of its saturation come from the art; the lightness stays close to the theme's
- * own ([darkLightness] or [lightLightness]), so text drawn in the theme's colours reads the same
- * on any cover. Art with no real colour in it keeps [fallback]. Fades between songs rather than
- * jumping.
+ * Three soft pools of the cover's colours: top left, top right and the middle, read off a 3x3
+ * shrink of it. Still, and redrawn only while a new song's colours fade in, so it costs the video
+ * stream nothing between songs. Fainter on a light card, where colour shows more. [wide] is for
+ * a whole screen: the pools gather on its left, behind the cover, and reach less far across it.
  */
 @Composable
-internal fun rememberArtColor(
-    art: android.graphics.Bitmap?,
-    fallback: Color,
-    darkLightness: Float = 0.2f,
-    lightLightness: Float = 0.86f,
-): Color {
-    val dark = fallback.luminance() < 0.5f
-    val tint by produceState<ArtColor.Tint?>(null, art) {
-        value = art?.let { withContext(Dispatchers.Default) { runCatching { ArtColor.of(it) }.getOrNull() } }
+internal fun AlbumGlow(art: android.graphics.Bitmap?, modifier: Modifier, wide: Boolean = false) {
+    val spots by produceState<List<Color>>(emptyList(), art) {
+        value = art?.let { kotlinx.coroutines.withContext(kotlinx.coroutines.Dispatchers.Default) { glowColours(it) } }.orEmpty()
+    }
+    val strength = if (MaterialTheme.colorScheme.surface.luminance() < 0.5f) 0.30f else 0.18f
+    val fade = tween<Color>(600)
+    val first by androidx.compose.animation.animateColorAsState(spots.getOrNull(0)?.copy(alpha = strength) ?: Color.Transparent, fade, label = "glow")
+    val second by androidx.compose.animation.animateColorAsState(spots.getOrNull(1)?.copy(alpha = strength) ?: Color.Transparent, fade, label = "glow")
+    val third by androidx.compose.animation.animateColorAsState(spots.getOrNull(2)?.copy(alpha = strength * 0.8f) ?: Color.Transparent, fade, label = "glow")
+    androidx.compose.foundation.Canvas(modifier) {
+        fun pool(colour: Color, x: Float, y: Float, reach: Float) {
+            if (colour.alpha <= 0f) return
+            drawRect(
+                androidx.compose.ui.graphics.Brush.radialGradient(
+                    listOf(colour, Color.Transparent),
+                    center = androidx.compose.ui.geometry.Offset(size.width * x, size.height * y),
+                    radius = size.width * reach,
+                ),
+            )
+        }
+        if (wide) {
+            pool(third, 0.22f, 0.8f, 0.35f)
+            pool(first, 0.1f, 0.25f, 0.42f)
+            pool(second, 0.3f, 0.45f, 0.38f)
+        } else {
+            pool(third, 0.5f, 0.5f, 0.85f)
+            pool(first, 0.2f, 0.1f, 0.9f)
+            pool(second, 0.85f, 0.22f, 0.8f)
+        }
     }
-    val target = tint?.let {
-        if (dark) Color.hsl(it.hue, it.saturation.coerceIn(0.3f, 0.5f), darkLightness)
-        else Color.hsl(it.hue, it.saturation.coerceIn(0.35f, 0.55f), lightLightness)
-    } ?: fallback
-    return animateColorAsState(target, tween(600), label = "art colour").value
+}
+
+/** The cover's colours at its top left, top right and middle. */
+private fun glowColours(art: android.graphics.Bitmap): List<Color> {
+    // A hardware bitmap can't be scaled or read on the CPU, so copy it out first.
+    val readable = if (art.config == android.graphics.Bitmap.Config.HARDWARE) art.copy(android.graphics.Bitmap.Config.ARGB_8888, false) else art
+    val small = android.graphics.Bitmap.createScaledBitmap(readable ?: return emptyList(), 3, 3, true)
+    return listOf(small.getPixel(0, 0), small.getPixel(2, 0), small.getPixel(1, 1)).map { Color(it).copy(alpha = 1f) }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/SavedPlaces.kt

@@ -0,0 +1,114 @@
+package app.seb3thehacker.gearslip.car
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.location.Geocoder
+import android.location.Location
+import android.location.LocationManager
+import app.seb3thehacker.gearslip.AppSettings
+import app.seb3thehacker.gearslip.GearslipLog
+import java.util.Locale
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.withTimeoutOrNull
+import org.json.JSONArray
+import org.json.JSONObject
+import kotlin.coroutines.resume
+
+/** One saved place. Home and Work keep a blank [label]; their names come from strings.xml. */
+data class SavedPlace(val label: String = "", val address: String = "")
+
+/**
+ * Up to [COUNT] places a driver can name by voice in any map app: slot [HOME], slot [WORK],
+ * then three they name themselves. "Navigate home" sends the saved address as the search.
+ */
+object SavedPlaces {
+
+    const val COUNT = 5
+    const val HOME = 0
+    const val WORK = 1
+
+    private const val KEY = "saved_places"
+
+    private val HOME_WORDS = setOf("home", "house", "place", "home address", "my home", "my house", "my place")
+    private val WORK_WORDS = setOf("work", "office", "job", "work address", "my work", "my office", "my job", "the office")
+
+    fun all(context: Context): List<SavedPlace> {
+        val saved = runCatching {
+            val array = JSONArray(AppSettings.getString(context, KEY, "[]"))
+            List(array.length()) { i ->
+                array.getJSONObject(i).let { SavedPlace(it.optString("label"), it.optString("address")) }
+            }
+        }.getOrDefault(emptyList())
+        return List(COUNT) { saved.getOrNull(it) ?: SavedPlace() }
+    }
+
+    fun set(context: Context, index: Int, place: SavedPlace) {
+        val next = all(context).toMutableList().also { it[index] = place }
+        val array = JSONArray()
+        next.forEach { array.put(JSONObject().put("label", it.label).put("address", it.address)) }
+        AppSettings.putString(context, KEY, array.toString())
+    }
+
+    /**
+     * The slot [spoken] names, if any: "home", "my house", "work", or a custom label. Returns the
+     * slot even when its address is blank, so the assistant can say it isn't set yet.
+     */
+    fun match(context: Context, spoken: String): Pair<Int, SavedPlace>? {
+        val said = spoken.lowercase().trim()
+        val places = all(context)
+        if (said in HOME_WORDS) return HOME to places[HOME]
+        if (said in WORK_WORDS) return WORK to places[WORK]
+        val squashed = squash(said.removePrefix("my ").removePrefix("the "))
+        if (squashed.isEmpty()) return null
+        places.forEachIndexed { i, place ->
+            if (i > WORK && place.label.isNotBlank() && squash(place.label) == squashed) return i to place
+        }
+        return null
+    }
+
+    private fun squash(s: String) = s.lowercase().filter { it.isLetterOrDigit() }
+
+    fun hasLocationPermission(context: Context) =
+        context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED ||
+            context.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED
+
+    /** Where the phone is now, as a street address, or as coordinates when there's no geocoder. Null if unknown. */
+    suspend fun here(context: Context): String? = withContext(Dispatchers.IO) {
+        val location = locate(context) ?: return@withContext null
+        val address = runCatching {
+            if (!Geocoder.isPresent()) return@runCatching null
+            @Suppress("DEPRECATION")
+            Geocoder(context, Locale.getDefault()).getFromLocation(location.latitude, location.longitude, 1)
+                ?.firstOrNull()?.getAddressLine(0)
+        }.getOrNull()
+        address ?: "%.6f,%.6f".format(Locale.US, location.latitude, location.longitude)
+    }
+
+    private suspend fun locate(context: Context): Location? {
+        if (!hasLocationPermission(context)) return null
+        val manager = context.getSystemService(LocationManager::class.java) ?: return null
+        val provider = listOf(LocationManager.FUSED_PROVIDER, LocationManager.GPS_PROVIDER, LocationManager.NETWORK_PROVIDER)
+            .firstOrNull { it in manager.allProviders && manager.isProviderEnabled(it) }
+        // A fresh fix: saving the spot you're standing on wants better than an hour-old one.
+        val fresh = provider?.let {
+            withTimeoutOrNull(FIX_TIMEOUT_MS) {
+                suspendCancellableCoroutine { done ->
+                    runCatching {
+                        manager.getCurrentLocation(it, null, context.mainExecutor) { fix -> done.resume(fix) }
+                    }.onFailure { e ->
+                        GearslipLog.w("places: fix failed: ${e.message}")
+                        done.resume(null)
+                    }
+                }
+            }
+        }
+        return fresh ?: manager.allProviders
+            .mapNotNull { runCatching { manager.getLastKnownLocation(it) }.getOrNull() }
+            .maxByOrNull { it.time }
+    }
+
+    private const val FIX_TIMEOUT_MS = 15_000L
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/ScreenHeader.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.RowScope
@@ -29,7 +31,7 @@ fun ScreenHeader(title: String, modifier: Modifier = Modifier, trailing: @Compos
         verticalAlignment = Alignment.CenterVertically,
         horizontalArrangement = Arrangement.spacedBy(12.dp),
     ) {
-        GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, "Back", navigator::back)
+        GsIconButton(Icons.AutoMirrored.Filled.ArrowBack, stringResource(R.string.back), navigator::back)
         Text(
             title,
             style = MaterialTheme.typography.headlineSmall,

gearslip/src/main/java/app/seb3thehacker/gearslip/car/TemplateChrome.kt

@@ -1,7 +1,16 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import android.graphics.Rect
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.compositionLocalOf
+import androidx.compose.runtime.mutableStateMapOf
+import androidx.compose.ui.layout.boundsInWindow
+import androidx.compose.ui.layout.onGloballyPositioned
+import androidx.compose.ui.geometry.Rect as ComposeRect
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
@@ -10,6 +19,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
@@ -86,87 +96,232 @@ fun TemplateChrome(template: Template?, modifier: Modifier = Modifier) {
  * How much of the surface Gearslip's chrome covers, so the app can keep what matters clear of
  * it. Expressed as the visible rectangle within a [width] x [height] surface.
  *
+ * Navigation's cards are measured where they land ([measured], from [ChromeCover]); an app
+ * centres its position marker in this rectangle, so a guess puts the marker under the card.
  * A template that isn't map-backed covers the surface completely, and reporting an empty
  * rectangle is how the app is told to stop bothering.
  */
-fun visibleAreaFor(template: Template?, width: Int, height: Int): Rect = when (template) {
-    is NavigationTemplate -> Rect(0, 0, width, (height * (1f - ESTIMATE_FRACTION)).toInt())
+fun visibleAreaFor(template: Template?, width: Int, height: Int, measured: Rect? = null, cardsAtEnd: Boolean = false): Rect = when (template) {
+    is NavigationTemplate -> measured ?: Rect(0, 0, width, height)
     is MapWithContentTemplate, is MapTemplate, is PlaceListNavigationTemplate,
     is RoutePreviewNavigationTemplate, is PlaceListMapTemplate,
-    -> Rect((width * CONTENT_PANE_FRACTION).toInt(), 0, width, height)
+    -> measured ?: if (cardsAtEnd) Rect(0, 0, (width * (1 - CARD_COLUMN_FRACTION)).toInt(), height)
+    else Rect((width * CARD_COLUMN_FRACTION).toInt(), 0, width, height)
     null -> Rect(0, 0, width, height)
     else -> Rect(0, 0, 0, 0)
 }
 
+/** The side of the map a piece of chrome sits against, and so the side it shrinks the visible area from. */
+internal enum class CoverEdge { TOP, BOTTOM, START, END }
+
+/**
+ * Where the chrome over the map actually landed, in window pixels. The map buttons count even
+ * while faded out, or whatever an app draws in a corner (Waze's speedometer) is under them the
+ * moment they come back.
+ */
+internal class ChromeCover {
+    private val pieces = mutableStateMapOf<String, Pair<CoverEdge, ComposeRect>>()
+
+    fun put(key: String, edge: CoverEdge, bounds: ComposeRect) {
+        val piece = edge to bounds
+        if (pieces[key] != piece) pieces[key] = piece
+    }
+
+    fun remove(key: String) {
+        pieces.remove(key)
+    }
+
+    /** What is left of a [width] x [height] surface at [surface] (window pixels), in surface pixels. */
+    fun visibleWithin(surface: ComposeRect, width: Int, height: Int, skip: CoverEdge? = null): Rect {
+        var left = 0f
+        var top = 0f
+        var right = width.toFloat()
+        var bottom = height.toFloat()
+        pieces.values.forEach { (edge, b) ->
+            if (edge == skip) return@forEach
+            when (edge) {
+                CoverEdge.TOP -> top = maxOf(top, b.bottom - surface.top)
+                CoverEdge.BOTTOM -> bottom = minOf(bottom, b.top - surface.top)
+                CoverEdge.START -> left = maxOf(left, b.right - surface.left)
+                CoverEdge.END -> right = minOf(right, b.left - surface.left)
+            }
+        }
+        // Never hand an app nothing to draw in, however the cards end up.
+        if (right - left < width / 4f) { left = 0f; right = width.toFloat() }
+        if (bottom - top < height / 4f) { top = 0f; bottom = height.toFloat() }
+        return Rect(left.toInt(), top.toInt(), right.toInt(), bottom.toInt())
+    }
+}
+
+internal val LocalChromeCover = compositionLocalOf<ChromeCover?> { null }
+
+/**
+ * The app's cards go to the far edge of the map and its buttons to the near one, set while the
+ * player is docked on the left: the player, the map and the cards each keep their own space
+ * instead of the cards crowding up against the player.
+ */
+internal val LocalCardsAtEnd = compositionLocalOf { false }
+
+/**
+ * How much of the map's width the docked player floats over, on the side opposite the cards. The
+ * map itself runs underneath at full size; the app is told this part is covered, and the chrome
+ * keeps clear of it.
+ */
+internal val LocalSidePanelInset = compositionLocalOf { 0.dp }
+
+/** The edge the app's cards cover, and the one its map buttons do. */
+internal val cardEdge @Composable get() = if (LocalCardsAtEnd.current) CoverEdge.END else CoverEdge.START
+internal val buttonEdge @Composable get() = if (LocalCardsAtEnd.current) CoverEdge.START else CoverEdge.END
+
+/**
+ * The floating nav bar, as far as the app's map is concerned. Its full [height] at once rather
+ * than following the slide, so the app is told once instead of every frame.
+ */
+@Composable
+internal fun BottomCover(height: androidx.compose.ui.unit.Dp, modifier: Modifier = Modifier) {
+    Box(modifier.fillMaxWidth().height(height).covers("nav-bar", CoverEdge.BOTTOM))
+}
+
+/** Records where this lands, padding included, until it leaves the screen. */
+@Composable
+internal fun Modifier.covers(key: String, edge: CoverEdge): Modifier {
+    val cover = LocalChromeCover.current ?: return this
+    DisposableEffect(cover, key) { onDispose { cover.remove(key) } }
+    return onGloballyPositioned { cover.put(key, edge, it.boundsInWindow()) }
+}
+
 // --- navigation ------------------------------------------------------------------------------
 
 @Composable
 private fun NavigationChrome(template: NavigationTemplate, modifier: Modifier) {
-    val pan by CarServices.nav.panMode.collectAsState()
-    Box(modifier.fillMaxWidth()) {
-        if (!pan) (template.navigationInfo as? RoutingInfo)?.let {
-            RoutingCard(it, Modifier.align(Alignment.TopStart).padding(12.dp).width(320.dp))
+    val connection = LocalCarAppConnection.current
+    val pan by connection.panMode.collectAsState()
+    // Pan mode clears the map for looking around: only the buttons stay.
+    val routing = (template.navigationInfo as? RoutingInfo)?.takeUnless { pan }
+    val estimate = template.destinationTravelEstimate?.takeUnless { pan }
+    NavigationBars(template, routing, estimate, modifier)
+}
+
+/**
+ * Cards down the left, map on the right: the turn on top, the trip along the bottom, the map
+ * buttons at the right edge. The whole column counts as covered, so the app centres its map in
+ * what is left over and the car sits right of the cards rather than under them. Pan mode drops
+ * the cards and gives the map the whole width.
+ */
+@Composable
+private fun NavigationBars(
+    template: NavigationTemplate,
+    routing: RoutingInfo?,
+    estimate: TravelEstimate?,
+    modifier: Modifier,
+) {
+    val connection = LocalCarAppConnection.current
+    val pan by connection.panMode.collectAsState()
+    val atEnd = LocalCardsAtEnd.current
+    val cardEdge = cardEdge
+    val buttonEdge = buttonEdge
+    androidx.compose.foundation.layout.BoxWithConstraints(modifier.fillMaxSize()) {
+        val column = cardColumnWidth(maxWidth)
+        val cards = @Composable {
+            if (routing != null || estimate != null) {
+                Column(
+                    Modifier.width(column).fillMaxHeight().covers("nav-cards", cardEdge).padding(12.dp),
+                    verticalArrangement = Arrangement.spacedBy(12.dp),
+                ) {
+                    routing?.let { RoutingCard(it, Modifier.fillMaxWidth()) }
+                    Spacer(Modifier.weight(1f))
+                    estimate?.let { TravelEstimateCard(it, Modifier.fillMaxWidth()) }
+                }
+            }
         }
-        RightEdgeControls(
-            if (pan) null else template.actionStrip,
-            template.mapActionStrip,
-            Modifier.align(Alignment.TopEnd).padding(12.dp),
-        )
-        if (!pan) template.destinationTravelEstimate?.let {
-            TravelEstimateBar(it, Modifier.align(Alignment.BottomStart).padding(12.dp))
+        val buttons = @Composable {
+            RightEdgeControls(
+                if (pan) null else template.actionStrip,
+                template.mapActionStrip,
+                Modifier.padding(12.dp),
+                mapActionsModifier = Modifier.covers("nav-buttons", buttonEdge),
+                alignment = if (atEnd) Alignment.Start else Alignment.End,
+            )
+        }
+        Row(Modifier.fillMaxSize()) {
+            if (atEnd) buttons() else cards()
+            Spacer(Modifier.weight(1f))
+            if (atEnd) cards() else buttons()
         }
     }
 }
 
-/** The manoeuvre card: what to do next, how far away it is, and onto what road. */
+/**
+ * The manoeuvre, big enough to read at a glance: the arrow and the distance to it, what to do
+ * and onto which road, the lanes to be in, and the turn after it along the bottom.
+ */
 @Composable
 private fun RoutingCard(info: RoutingInfo, modifier: Modifier = Modifier) {
     if (info.isLoading) {
         ChromeSurface(modifier) {
-            Text("Finding a route…", Modifier.padding(16.dp), style = ChromeType.title)
+            Text(stringResource(R.string.nav_finding_route), Modifier.padding(horizontal = 18.dp, vertical = 16.dp), style = ChromeType.title)
         }
         return
     }
 
     val step = info.currentStep ?: return
+    val scheme = MaterialTheme.colorScheme
     ChromeSurface(modifier) {
-        Column(Modifier.padding(14.dp)) {
-            Row(verticalAlignment = Alignment.CenterVertically) {
-                CarGlyph(step.maneuver?.icon, Modifier.size(44.dp))
-                Spacer(Modifier.width(12.dp))
-                Column(Modifier.weight(1f)) {
-                    val distance = info.currentDistance.display()
-                    if (distance.isNotEmpty()) {
-                        Text(distance, style = ChromeType.headline)
+        Column {
+            Column(
+                Modifier.fillMaxWidth().background(scheme.primaryContainer).padding(16.dp),
+                verticalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                androidx.compose.runtime.CompositionLocalProvider(
+                    androidx.compose.material3.LocalContentColor provides scheme.onPrimaryContainer,
+                ) {
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        CarGlyph(step.maneuver?.icon, Modifier.size(64.dp))
+                        Spacer(Modifier.width(14.dp))
+                        val distance = info.currentDistance.display()
+                        if (distance.isNotEmpty()) {
+                            Text(
+                                distance,
+                                style = MaterialTheme.typography.displaySmall.copy(fontWeight = androidx.compose.ui.text.font.FontWeight.Bold),
+                                maxLines = 1,
+                            )
+                        }
                     }
-                    Text(step.cue.text(), style = ChromeType.title, maxLines = 2, overflow = TextOverflow.Ellipsis)
+                    val cue = step.cue.text()
+                    if (cue.isNotEmpty()) {
+                        Text(cue, style = ChromeType.title, maxLines = 2, overflow = TextOverflow.Ellipsis)
+                    }
+                    val road = step.road.text()
+                    // "Turn left onto Queensberry Drive" already says the road; saying it twice is noise.
+                    if (road.isNotEmpty() && !cue.contains(road, ignoreCase = true)) {
+                        Text(
+                            road,
+                            style = ChromeType.body,
+                            color = scheme.onPrimaryContainer.copy(alpha = 0.8f),
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis,
+                        )
+                    }
+                    if (step.lanesImage != null || step.lanes.orEmpty().isNotEmpty()) {
+                        LaneGuidance(step, Modifier.fillMaxWidth().heightIn(max = 56.dp))
+                    }
+                    // Rare, and only where an arrow can't explain the junction: worth the card growing for.
+                    info.junctionImage?.let { JunctionImage(it) }
                 }
             }
-            val road = step.road.text()
-            if (road.isNotEmpty()) {
-                Text(
-                    road,
-                    style = ChromeType.body,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                    maxLines = 1,
-                    overflow = TextOverflow.Ellipsis,
-                )
-            }
-            // Neither is sent by every app - most say only "turn left" and trust the driver to
-            // find the lane themselves - so both are drawn only when there is something to draw.
-            info.junctionImage?.let { junction ->
-                Spacer(Modifier.height(10.dp))
-                JunctionImage(junction)
-            }
-            LaneGuidance(step, Modifier.padding(top = 10.dp))
             info.nextStep?.let { next ->
-                Spacer(Modifier.height(8.dp))
-                Row(verticalAlignment = Alignment.CenterVertically) {
-                    Text("then", style = ChromeType.label, color = MaterialTheme.colorScheme.onSurfaceVariant)
-                    Spacer(Modifier.width(8.dp))
-                    CarGlyph(next.maneuver?.icon, Modifier.size(20.dp))
-                    Spacer(Modifier.width(8.dp))
-                    Text(next.cue.text(), style = ChromeType.body, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                Row(
+                    Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 10.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                ) {
+                    Text(stringResource(R.string.nav_then), style = ChromeType.label, color = scheme.onSurfaceVariant)
+                    Spacer(Modifier.width(10.dp))
+                    CarGlyph(next.maneuver?.icon, Modifier.size(28.dp))
+                    val nextText = next.cue.text().ifEmpty { next.road.text() }
+                    if (nextText.isNotEmpty()) {
+                        Spacer(Modifier.width(10.dp))
+                        Text(nextText, style = ChromeType.body, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                    }
                 }
             }
         }
@@ -221,7 +376,7 @@ private fun LaneTile(lane: Lane) {
     ) {
         Icon(
             Icons.Filled.KeyboardArrowUp,
-            contentDescription = if (recommended) "Recommended lane" else "Lane",
+            contentDescription = stringResource(if (recommended) R.string.nav_lane_recommended else R.string.nav_lane),
             tint = if (recommended) MaterialTheme.colorScheme.onPrimaryContainer
             else MaterialTheme.colorScheme.onSurfaceVariant,
             modifier = Modifier.size(24.dp).rotate(shown.turnDegrees()),
@@ -243,63 +398,59 @@ private fun LaneDirection?.turnDegrees(): Float = when (this?.shape) {
 }
 
 /**
- * The trip at a glance: time and distance left, the clock time it ends at, and - beside them,
- * where a thumb reaches - the app's own way to stop navigating. A floating card rather than a
- * full-width bar, so it reads as one thing beside the manoeuvre card above it instead of a strip
- * that happens to hold three numbers. The close button is Gearslip's own, not the app's: an
- * actionStrip's actions carry no flag saying which one (if any) means "stop navigating" - the
- * first button here turned out to be a mute toggle, not an exit - so this leaves the app the way
- * going Home already does, rather than guess at the app's own controls and risk getting it wrong.
+ * The trip at a glance, stacked: time left on top, then the clock time it ends at and the
+ * distance, with Gearslip's own stop button beside them. The close button is Gearslip's, not the
+ * app's: an actionStrip's actions carry no flag saying which one (if any) means "stop
+ * navigating" - the first button turned out to be a mute toggle, not an exit - so this ends
+ * navigation the way going Home already does rather than guess at the app's own controls.
  */
 @Composable
-private fun TravelEstimateBar(estimate: TravelEstimate, modifier: Modifier = Modifier) {
+private fun TravelEstimateCard(estimate: TravelEstimate, modifier: Modifier = Modifier) {
+    val connection = LocalCarAppConnection.current
     val time = remainingTime(estimate.remainingTimeSeconds)
     val distance = estimate.remainingDistance.display()
     val arrival = estimate.arrivalTimeAtDestination.clockTime()
     val trip = estimate.tripText.text()
     if (time.isEmpty() && distance.isEmpty() && arrival.isEmpty() && trip.isEmpty()) return
 
-    val detail = listOfNotNull(
-        arrival.takeIf { it.isNotEmpty() },
-        distance.takeIf { it.isNotEmpty() },
-        trip.takeIf { it.isNotEmpty() },
-    ).joinToString("  •  ")
-
-    // The same solid card the manoeuvre card above it uses - one surface for the whole map
-    // chrome, rather than this one spot styled on its own as a bar over the map.
-    ChromeSurface(modifier, shadowElevation = 8.dp) {
+    ChromeSurface(modifier) {
         val dark = MaterialTheme.colorScheme.surface.luminanceIsDark()
         Row(
-            Modifier.padding(start = 8.dp, end = 18.dp, top = 10.dp, bottom = 10.dp),
+            Modifier.padding(start = 18.dp, end = 12.dp, top = 12.dp, bottom = 12.dp),
             verticalAlignment = Alignment.CenterVertically,
         ) {
-            // Not a disconnect: the connection stays up and the app decides its own next screen.
-            // Ending navigation is its own call, separate from a back press - a back press only
-            // pops the on-screen card, leaving the app still believing it is navigating (so a
-            // freshly picked destination silently does nothing); this is the call that actually
-            // clears that flag on the app's side.
-            GsIconButton(
-                Icons.Filled.Close,
-                "Stop navigating",
-                { CarServices.nav.stopNavigating() },
-                colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, MaterialTheme.colorScheme.onSurface),
-                size = 40.dp,
-                iconSize = 20.dp,
-                shape = CircleShape,
-            )
-            Spacer(Modifier.width(10.dp))
-            Column {
+            Column(Modifier.weight(1f)) {
                 if (time.isNotEmpty()) {
                     Text(
                         time,
                         style = ChromeType.headline,
                         color = estimate.remainingTimeColor.color(dark, MaterialTheme.colorScheme.onSurface),
+                        maxLines = 1,
                     )
                 }
+                val detail = listOfNotNull(
+                    arrival.takeIf { it.isNotEmpty() }?.let { stringResource(R.string.nav_arrive, it) },
+                    distance.takeIf { it.isNotEmpty() },
+                ).joinToString("  •  ")
                 if (detail.isNotEmpty()) {
-                    Text(detail, style = ChromeType.body, color = MaterialTheme.colorScheme.onSurfaceVariant)
+                    Text(detail, style = ChromeType.body, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                }
+                if (trip.isNotEmpty()) {
+                    Text(trip, style = ChromeType.body, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
                 }
             }
+            // Not a disconnect: the connection stays up and the app decides its own next screen.
+            // Ending navigation is its own call, separate from a back press - a back press only
+            // pops the on-screen card, leaving the app still believing it is navigating.
+            GsIconButton(
+                Icons.Filled.Close,
+                stringResource(R.string.nav_stop),
+                { connection.stopNavigating() },
+                colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, MaterialTheme.colorScheme.onSurface),
+                size = 52.dp,
+                iconSize = 26.dp,
+                shape = CircleShape,
+            )
         }
     }
 }
@@ -321,16 +472,20 @@ private fun MapPaneLayout(
     fullHeight: Boolean = false,
     pane: @Composable () -> Unit,
 ) {
+    val connection = LocalCarAppConnection.current
     // Pan mode hands the whole screen to the map, leaving only its own controls.
-    val pan by CarServices.nav.panMode.collectAsState()
+    val pan by connection.panMode.collectAsState()
     val edgeActions = (actionStrip?.actions.orEmpty() + mapActionStrip?.actions.orEmpty()).map { it.identity() }.toSet()
+    val atEnd = LocalCardsAtEnd.current
+    val cardEdge = cardEdge
     androidx.compose.foundation.layout.BoxWithConstraints(modifier.fillMaxWidth()) {
         if (!pan) {
             ChromeSurface(
                 Modifier
-                    .align(Alignment.TopStart)
+                    .align(if (atEnd) Alignment.TopEnd else Alignment.TopStart)
+                    .covers("map-pane", cardEdge)
                     .padding(12.dp)
-                    .width(maxOf(maxWidth * CONTENT_PANE_FRACTION - 12.dp, 232.dp))
+                    .width(cardColumnWidth(maxWidth) - 24.dp)
                     .let { if (fullHeight) it.height(maxHeight - 24.dp) else it.heightIn(max = maxHeight - 24.dp) },
                 shape = androidx.compose.foundation.shape.RoundedCornerShape(20.dp),
                 shadowElevation = 8.dp,
@@ -341,7 +496,8 @@ private fun MapPaneLayout(
         RightEdgeControls(
             if (pan) null else actionStrip,
             mapActionStrip,
-            Modifier.align(Alignment.TopEnd).padding(12.dp),
+            Modifier.align(if (atEnd) Alignment.TopStart else Alignment.TopEnd).padding(12.dp),
+            alignment = if (atEnd) Alignment.Start else Alignment.End,
         )
     }
 }
@@ -421,7 +577,7 @@ private fun RoutePreviewChrome(template: RoutePreviewNavigationTemplate, modifie
                 )
                 Box(Modifier.weight(1f, fill = false)) {
                     if (template.isLoading) {
-                        Text("Finding routes…", Modifier.padding(14.dp), style = ChromeType.title)
+                        Text(stringResource(R.string.nav_finding_routes), Modifier.padding(14.dp), style = ChromeType.title)
                     } else {
                         ItemListColumn(template.itemList)
                     }
@@ -445,17 +601,22 @@ private fun ListPane(
     ChromeSurface(modifier, shape = androidx.compose.foundation.shape.RoundedCornerShape(0.dp)) {
         Column {
             HeaderBar(title, startAction)
-            if (loading) Text("Loading…", Modifier.padding(14.dp), style = ChromeType.title)
+            if (loading) Text(stringResource(R.string.media_loading), Modifier.padding(14.dp), style = ChromeType.title)
             else ItemListColumn(itemList)
         }
     }
 }
 
-/** Fraction of the surface the content pane covers beside a map. */
-private const val CONTENT_PANE_FRACTION = 0.42f
 
-/** Fraction of the surface the travel-estimate bar covers along the bottom. */
-private const val ESTIMATE_FRACTION = 0.14f
+
+/**
+ * The width of the cards beside the map, the same for a place card and for navigation so the
+ * map doesn't jump sideways when a route starts.
+ */
+internal fun cardColumnWidth(maxWidth: androidx.compose.ui.unit.Dp): androidx.compose.ui.unit.Dp =
+    (maxWidth * CARD_COLUMN_FRACTION).coerceIn(280.dp, 440.dp).coerceAtMost(maxWidth)
+
+private const val CARD_COLUMN_FRACTION = 0.4f
 
 /** Search, sign-in and the like are laid out for a whole column, so they keep one. */
 private fun Template?.needsFullHeight() =

gearslip/src/main/java/app/seb3thehacker/gearslip/car/TemplateContent.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.material.icons.filled.Close
@@ -317,7 +319,7 @@ internal fun SearchField(
                 Spacer(Modifier.width(12.dp))
             }
             Text(
-                query.ifEmpty { hint.ifEmpty { "Search" } },
+                query.ifEmpty { hint.ifEmpty { stringResource(R.string.template_search) } },
                 style = MaterialTheme.typography.titleMedium,
                 color = if (query.isEmpty()) muted else MaterialTheme.colorScheme.onSurface,
                 maxLines = 1,
@@ -327,7 +329,7 @@ internal fun SearchField(
             if (onClear != null && query.isNotEmpty()) {
                 GsIconButton(
                     androidx.compose.material.icons.Icons.Filled.Close,
-                    "Clear",
+                    stringResource(R.string.storage_clear),
                     onClear,
                     colors = GsColors(androidx.compose.ui.graphics.Color.Transparent, muted),
                     size = 42.dp,
@@ -517,7 +519,8 @@ private val sectionCache = android.util.LruCache<String, List<Item>>(64)
  */
 @Composable
 private fun SectionedContent(template: SectionedItemTemplate, modifier: Modifier, showActionsInHeader: Boolean = true, tabId: String = "") {
-    val appPackage = CarServices.nav.appPackage.orEmpty()
+    val connection = LocalCarAppConnection.current
+    val appPackage = connection.appPackage.orEmpty()
     ContentSurface(modifier) {
         // The app's own actions (Spotify's search and Liked Songs shortcut, for two) come from
         // template.actions, not the header - but a bottom-of-content row is wrong for a driver
@@ -622,7 +625,7 @@ private fun MediaPlaybackContent(template: MediaPlaybackTemplate, modifier: Modi
         } else {
             Box(Modifier.weight(1f).fillMaxWidth(), contentAlignment = Alignment.Center) {
                 Text(
-                    "Nothing playing yet.",
+                    stringResource(R.string.template_nothing_playing),
                     style = ChromeType.body,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                     textAlign = androidx.compose.ui.text.style.TextAlign.Center,
@@ -646,6 +649,6 @@ private typealias ColumnScopeAlias = androidx.compose.foundation.layout.ColumnSc
 @Composable
 private fun Loading() {
     Box(Modifier.fillMaxWidth().height(80.dp), contentAlignment = Alignment.Center) {
-        Text("Loading…", style = ChromeType.title)
+        Text(stringResource(R.string.media_loading), style = ChromeType.title)
     }
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/TemplateParts.kt

@@ -1,5 +1,8 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.input.pointer.changedToUp
+import app.seb3thehacker.gearslip.R
 import app.seb3thehacker.gearslip.car.theme.*
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
@@ -34,6 +37,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Call
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.Menu
+import androidx.compose.material.icons.filled.MoreVert
 import androidx.compose.material.icons.filled.Warning
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
@@ -106,7 +110,8 @@ internal fun ChromeSurface(
 ) {
     Surface(
         shadowElevation = shadowElevation,
-        color = MaterialTheme.colorScheme.surface,
+        // The nav bar's own container colour, so cards over the map match the rest of the car UI.
+        color = MaterialTheme.colorScheme.surfaceContainer,
         contentColor = MaterialTheme.colorScheme.onSurface,
         shape = shape,
         modifier = modifier,
@@ -217,28 +222,41 @@ internal fun headerTitle(header: Header?, fallback: String): String =
  * actions in a row along the top, its map controls stacked under them. Keeping them in one
  * column is what stops them colliding on a screen only 480px tall.
  */
+/** How visible the map buttons stay once they fade: enough to know they're there. */
+private const val RESTING_ALPHA = 0.35f
+
 @Composable
 internal fun RightEdgeControls(
     actionStrip: ActionStrip?,
     mapActionStrip: ActionStrip?,
     modifier: Modifier = Modifier,
+    /** For the stack of map buttons alone, without the row of the app's own above it. */
+    mapActionsModifier: Modifier = Modifier,
+    /** End normally; Start when the app's cards have moved to the far edge and these to the near one. */
+    alignment: Alignment.Horizontal = Alignment.End,
 ) {
+    val connection = LocalCarAppConnection.current
     val actions = actionStrip?.actions.orEmpty().filter { it.isDrawable() }
     val mapActions = mapActionStrip?.actions.orEmpty().filter { it.isDrawable() }
     if (actions.isEmpty() && mapActions.isEmpty()) return
     // A template that stops offering Pan must not leave the screen stuck in pan mode.
     val hasPan = (actions + mapActions).any { it.type == Action.TYPE_PAN }
-    androidx.compose.runtime.LaunchedEffect(hasPan) { if (!hasPan) CarServices.nav.setPanMode(false) }
+    androidx.compose.runtime.LaunchedEffect(hasPan) { if (!hasPan) connection.setPanMode(false) }
 
     // Faded out when the screen has been left alone; then they are only a memory of buttons, so
     // the first touch on one wakes them rather than pressing it.
     val awake = LocalMapControlsWake.current.awake
-    val pan by CarServices.nav.panMode.collectAsState()
+    val pan by connection.panMode.collectAsState()
     // Kept up while the knob is on one of them, or the ring would fade out along with the button.
     var holdsFocus by remember { mutableStateOf(false) }
     val visible = awake || pan || holdsFocus
+    // With the player beside the map there is no room for the app's row and the map controls
+    // both, so the app's own buttons fold behind one; opening it swaps them in for the map's.
+    val folded = LocalSidePanelInset.current > 0.dp && actions.size > 1
+    var open by remember { mutableStateOf(false) }
+    androidx.compose.runtime.LaunchedEffect(visible, folded) { if (!visible || !folded) open = false }
     val alpha by androidx.compose.animation.core.animateFloatAsState(
-        targetValue = if (visible) 1f else 0f,
+        targetValue = if (visible) 1f else RESTING_ALPHA,
         animationSpec = androidx.compose.animation.core.tween(if (visible) 150 else 500),
         label = "mapControls",
     )
@@ -255,15 +273,50 @@ internal fun RightEdgeControls(
                     }
                 }
             },
-        horizontalAlignment = Alignment.End,
+        horizontalAlignment = alignment,
         verticalArrangement = Arrangement.spacedBy(8.dp),
     ) {
-        if (actions.isNotEmpty()) {
+        if (folded) {
+            val scheme = MaterialTheme.colorScheme
+            GsIconButton(
+                Icons.Filled.MoreVert,
+                stringResource(R.string.car_group_more),
+                onClick = { open = !open },
+                colors = GsColors(if (open) scheme.primary else scheme.surfaceContainerHighest, if (open) scheme.onPrimary else scheme.onSurface),
+                size = ICON_BUTTON_SIZE,
+                iconSize = ICON_BUTTON_GLYPH,
+                shape = androidx.compose.foundation.shape.CircleShape,
+            )
+            if (open) {
+                // A tap on any of them closes the stack again; the tap still reaches the button.
+                Column(
+                    Modifier.pointerInput(Unit) {
+                        awaitPointerEventScope {
+                            while (true) {
+                                if (awaitPointerEvent(PointerEventPass.Initial).changes.any { it.changedToUp() }) open = false
+                            }
+                        }
+                    },
+                    horizontalAlignment = alignment,
+                    verticalArrangement = Arrangement.spacedBy(8.dp),
+                ) {
+                    actions.forEach { ActionButton(it) }
+                }
+            }
+        } else if (actions.isNotEmpty()) {
             Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                 actions.forEach { ActionButton(it) }
             }
         }
-        mapActions.forEach { ActionButton(it) }
+        if (mapActions.isNotEmpty() && !(folded && open)) {
+            Column(
+                mapActionsModifier,
+                horizontalAlignment = alignment,
+                verticalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                mapActions.forEach { ActionButton(it) }
+            }
+        }
     }
 }
 
@@ -278,7 +331,7 @@ internal fun ActionRow(actions: List<Action>, modifier: Modifier = Modifier, lar
 }
 
 /** A row with nothing to show: no words, no picture, nothing to tap. */
-private fun CarRow.isBlank(): Boolean =
+internal fun CarRow.isBlank(): Boolean =
     title.text().isBlank() && texts.orEmpty().all { it.text().isBlank() } && image == null &&
         toggle == null && onClickDelegate == null && actions.orEmpty().isEmpty()
 
@@ -288,13 +341,14 @@ private fun CarRow.isBlank(): Boolean =
  */
 @Composable
 internal fun ActionButton(action: Action, large: Boolean = false, modifier: Modifier = Modifier) {
+    val connection = LocalCarAppConnection.current
     if (action.type == Action.TYPE_APP_ICON) {
         AppIconBadge()
         return
     }
     val dark = MaterialTheme.colorScheme.surface.luminanceIsDark()
     val title = action.title.text()
-    val panOn by CarServices.nav.panMode.collectAsState()
+    val panOn by connection.panMode.collectAsState()
     val active = action.type == Action.TYPE_PAN && panOn
     val scheme = MaterialTheme.colorScheme
     val custom = action.backgroundColor?.type?.let { it != androidx.car.app.model.CarColor.TYPE_DEFAULT } == true
@@ -309,8 +363,8 @@ internal fun ActionButton(action: Action, large: Boolean = false, modifier: Modi
 
     GsIconBox(
         onClick = {
-            if (action.type == Action.TYPE_BACK) CarServices.nav.backPressed()
-            else if (action.type == Action.TYPE_PAN) CarServices.nav.setPanMode(!panOn)
+            if (action.type == Action.TYPE_BACK) connection.backPressed()
+            else if (action.type == Action.TYPE_PAN) connection.setPanMode(!panOn)
             else action.onClickDelegate?.click("action")
         },
         modifier = modifier,
@@ -407,7 +461,7 @@ internal fun AutoStartButton(action: Action, modifier: Modifier = Modifier) {
             ) {
                 if (hasGlyph) CarGlyph(action.icon, Modifier.size(24.dp).align(Alignment.CenterStart))
                 Text(
-                    action.title.text().ifEmpty { "Start" },
+                    action.title.text().ifEmpty { stringResource(R.string.template_start) },
                     style = ChromeType.title,
                     maxLines = 1,
                 )
@@ -421,8 +475,9 @@ private const val AUTO_START_MS = 5_000L
 /** The connected app's own launcher icon, which is what the app-icon action stands for. */
 @Composable
 private fun AppIconBadge() {
+    val connection = LocalCarAppConnection.current
     val context = LocalContext.current
-    val pkg = CarServices.nav.appPackage
+    val pkg = connection.appPackage
     val icon = remember(pkg) {
         pkg?.let {
             runCatching {
@@ -497,315 +552,6 @@ internal fun CarGlyph(icon: CarIcon?, modifier: Modifier = Modifier, standard: I
 
 // --- lists, grids and panes ---------------------------------------------------------------------
 
-@Composable
-internal fun PaneTitle(title: String) {
-    if (title.isEmpty()) return
-    Text(
-        title,
-        style = ChromeType.title,
-        modifier = Modifier.padding(horizontal = 14.dp, vertical = 10.dp),
-    )
-}
-
-@Composable
-internal fun ItemListColumn(
-    single: ItemList?,
-    sectioned: List<ItemList>? = null,
-    modifier: Modifier = Modifier,
-) {
-    val rows = buildList {
-        single?.items?.filterIsInstance<CarRow>()?.let(::addAll)
-        sectioned?.forEach { list -> addAll(list.items.filterIsInstance<CarRow>()) }
-    }
-    if (rows.isEmpty()) {
-        val message = single?.noItemsMessage.text()
-        if (message.isNotEmpty()) Text(message, Modifier.padding(14.dp), style = ChromeType.body)
-        return
-    }
-    // A list the app made selectable is a single-choice list: one option chosen, shown as a radio.
-    val onSelected = single?.onSelectedDelegate
-    val chosen = single?.selectedIndex ?: -1
-    LazyColumn(modifier, contentPadding = PaddingValues(bottom = 8.dp)) {
-        itemsIndexed(rows) { index, row ->
-            RowItem(row, onSelected?.let { RowSelection(index == chosen) { it.selected(index) } })
-        }
-    }
-}
-
-/** A grid of tappable tiles - what apps use for a home screen beside the map. Icons here are as
- * often a small menu glyph (Organic Maps' Search, say) as real cover art, so the tile stays
- * modest; [GridTile]'s own default is for the shelf case, where every tile is a photo. */
-@Composable
-internal fun GridItems(list: ItemList?, modifier: Modifier = Modifier) {
-    val items = list?.items?.filterIsInstance<GridItem>().orEmpty()
-    if (items.isEmpty()) return
-    LazyVerticalGrid(
-        columns = GridCells.Adaptive(84.dp),
-        modifier = modifier,
-        contentPadding = PaddingValues(horizontal = 8.dp, vertical = 4.dp),
-        horizontalArrangement = Arrangement.spacedBy(6.dp),
-        verticalArrangement = Arrangement.spacedBy(6.dp),
-    ) {
-        items(items) { item -> GridTile(item, iconSize = 36.dp) }
-    }
-}
-
-/**
- * One cover-art tile: an app's own icon over a title and optional subtitle. Shared by
- * [GridItems] (a whole screen of tiles, [iconSize] scaled down there to suit a plain menu glyph)
- * and a section's horizontal shelf, which carries the same [GridItem] type but scrolls sideways
- * instead of wrapping into a grid and wants its full-size cover art.
- */
-@Composable
-internal fun GridTile(item: GridItem, modifier: Modifier = Modifier, iconSize: androidx.compose.ui.unit.Dp = 144.dp) {
-    Column(
-        modifier
-            .clickable { item.onClickDelegate.click("grid item") }
-            .padding(vertical = 8.dp),
-        horizontalAlignment = Alignment.CenterHorizontally,
-    ) {
-        CarGlyph(item.image, Modifier.size(iconSize))
-        Spacer(Modifier.height(6.dp))
-        Text(
-            item.title.text(),
-            style = ChromeType.label,
-            maxLines = 1,
-            overflow = TextOverflow.Ellipsis,
-        )
-        val subtitle = item.text.text()
-        if (subtitle.isNotEmpty()) {
-            Text(
-                subtitle,
-                style = ChromeType.label,
-                color = MaterialTheme.colorScheme.onSurfaceVariant,
-                maxLines = 1,
-                overflow = TextOverflow.Ellipsis,
-            )
-        }
-    }
-}
-
-/**
- * [autoStart] is for a pane floating over a map - a place or a route the app is proposing - where
- * a single action counts itself down rather than waiting to be pressed, on the theory that a
- * driver glancing at the car screen has already decided. It never applies to more than one
- * action: a pane offering a real choice (Start vs. something else) always waits to be tapped.
- */
-@Composable
-internal fun PaneRows(pane: Pane?, modifier: Modifier = Modifier, autoStart: Boolean = false) {
-    // Some apps pad a pane with a row of blank strings; drawn, it is just a gap.
-    val rows = pane?.rows.orEmpty().filterNot { it.isBlank() }
-    val actions = pane?.actions.orEmpty().filter { it.isDrawable() }
-    val card = PlaceCard.of(rows)
-    Column(modifier) {
-        card.heading?.let { PlaceHeading(it) }
-        if (card.buttons.isNotEmpty()) RowButtons(card.buttons, Modifier.padding(horizontal = 14.dp, vertical = 6.dp))
-        if (autoStart && actions.size == 1) {
-            AutoStartButton(actions.single(), Modifier.padding(horizontal = 14.dp, vertical = 10.dp))
-        } else {
-            ActionRow(actions, Modifier.padding(horizontal = 14.dp, vertical = 10.dp), large = true)
-        }
-        if (card.heading == null && card.buttons.isEmpty()) {
-            card.details.forEach { RowItem(it, large = true) }
-        } else {
-            card.details.forEach { DetailRow(it, card.heading?.title?.text().orEmpty()) }
-        }
-    }
-}
-
-/**
- * A pane split the way a place page reads: a name on top, the things to do with it as buttons,
- * then the facts. Apps send all three as plain rows, so the split is worked out from the rows'
- * shape alone. A pane that doesn't fit the shape - all of it tappable, like a menu - gets no
- * heading and no buttons, and draws exactly as a plain list of rows.
- */
-private class PlaceCard(val heading: CarRow?, val buttons: List<CarRow>, val details: List<CarRow>) {
-    companion object {
-        fun of(rows: List<CarRow>): PlaceCard {
-            // A short tappable row with an icon and nothing under it is a button in all but name:
-            // MAPS.ME's "Let's go" and "Save".
-            val buttons = rows.filter {
-                it.onClickDelegate != null && it.toggle == null && it.image != null &&
-                    it.texts.orEmpty().isEmpty() && it.title.text().length <= 24
-            }.takeIf { it.size in 1..4 && it.size < rows.size }.orEmpty()
-            // A first row that can't be tapped and has no icon is the place's name and kind.
-            val heading = rows.firstOrNull()?.takeIf {
-                buttons.isNotEmpty() && it.onClickDelegate == null && it.image == null && it.toggle == null
-            }
-            return PlaceCard(heading, buttons, rows - buttons.toSet() - listOfNotNull(heading).toSet())
-        }
-    }
-}
-
-@Composable
-private fun PlaceHeading(row: CarRow) {
-    Column(Modifier.fillMaxWidth().padding(horizontal = 14.dp, vertical = 6.dp)) {
-        Text(row.title.text(), style = ChromeType.title, maxLines = 2, overflow = TextOverflow.Ellipsis)
-        row.texts.orEmpty().take(2).forEach {
-            Text(it.text(), style = ChromeType.body, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
-        }
-    }
-}
-
-/** Button-shaped rows side by side, the first one filled as the thing most drivers came to do. */
-@Composable
-private fun RowButtons(rows: List<CarRow>, modifier: Modifier) {
-    val scheme = MaterialTheme.colorScheme
-    Row(modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
-        rows.forEachIndexed { i, row ->
-            GsIconBox(
-                onClick = { row.onClickDelegate.click("row") },
-                modifier = Modifier.weight(1f),
-                colors = if (i == 0) GsColors(scheme.primary, scheme.onPrimary) else GsColors(scheme.surfaceContainerHighest, scheme.onSurface),
-                enabled = row.isEnabled,
-                shape = RoundedCornerShape(24.dp),
-            ) {
-                Row(
-                    Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 14.dp),
-                    horizontalArrangement = Arrangement.Center,
-                    verticalAlignment = Alignment.CenterVertically,
-                ) {
-                    CarGlyph(row.image, Modifier.size(24.dp))
-                    Spacer(Modifier.width(8.dp))
-                    Text(row.title.text(), style = ChromeType.body, maxLines = 1, overflow = TextOverflow.Ellipsis)
-                }
-            }
-        }
-    }
-}
-
-/**
- * One fact about a place, tighter than a list row: a small label over its value, or just the
- * value when the row has no label. A phone number gets a Call button that asks first.
- */
-@Composable
-private fun DetailRow(row: CarRow, placeName: String) {
-    val context = LocalContext.current
-    val texts = row.texts.orEmpty().map { it.text() }.filter { it.isNotBlank() }
-    val label = row.title.text().takeIf { texts.isNotEmpty() }
-    val values = texts.ifEmpty { listOf(row.title.text()) }
-    val number = values.firstOrNull { it.isPhoneNumber() }
-    val canCall = number != null &&
-        context.checkSelfPermission(android.Manifest.permission.CALL_PHONE) == android.content.pm.PackageManager.PERMISSION_GRANTED
-    Row(
-        Modifier
-            .fillMaxWidth()
-            .let { if (row.onClickDelegate != null && row.isEnabled) it.clickable { row.onClickDelegate.click("row") } else it }
-            .padding(horizontal = 14.dp, vertical = 6.dp),
-        verticalAlignment = Alignment.CenterVertically,
-    ) {
-        row.image?.let {
-            CarGlyph(it, Modifier.size(24.dp))
-            Spacer(Modifier.width(12.dp))
-        }
-        Column(Modifier.weight(1f)) {
-            label?.let {
-                Text(it, style = MaterialTheme.typography.labelLarge, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1)
-            }
-            values.take(3).forEach {
-                Text(it, style = ChromeType.body, maxLines = 2, overflow = TextOverflow.Ellipsis)
-            }
-        }
-        if (canCall) {
-            Spacer(Modifier.width(8.dp))
-            GsIconBox(
-                onClick = { CallPrompt.ask(placeName.ifBlank { number!! }, number!!) },
-                colors = GsColors(MaterialTheme.colorScheme.primary, MaterialTheme.colorScheme.onPrimary),
-                shape = RoundedCornerShape(24.dp),
-            ) {
-                Row(Modifier.padding(horizontal = 16.dp, vertical = 10.dp), verticalAlignment = Alignment.CenterVertically) {
-                    androidx.compose.material3.Icon(Icons.Filled.Call, null, Modifier.size(20.dp))
-                    Spacer(Modifier.width(6.dp))
-                    Text("Call", style = ChromeType.body)
-                }
-            }
-        }
-        ActionRow(row.actions.orEmpty())
-    }
-}
-
-/** A line that is only a phone number: digits with the usual separators, 7 to 15 digits long. */
-private fun String.isPhoneNumber(): Boolean {
-    val t = trim()
-    if (!Regex("""^\+?[0-9 ().\-]+$""").matches(t)) return false
-    return t.count { it.isDigit() } in 7..15
-}
-
-@Composable
-internal fun RowItem(row: CarRow, selection: RowSelection? = null, large: Boolean = false) {
-    val toggle = row.toggle
-    // Shown at once and corrected when the app answers with its own template, so the switch
-    // never lags a tap; keyed on what the app last said so its answer wins.
-    var checked by remember(toggle?.isChecked) { mutableStateOf(toggle?.isChecked == true) }
-    val clickable = row.isEnabled && (toggle != null || selection != null || row.onClickDelegate != null)
-    Row(
-        Modifier
-            .fillMaxWidth()
-            .let {
-                if (!clickable) it else it.clickable {
-                    when {
-                        toggle != null -> {
-                            checked = !checked
-                            toggle.onCheckedChangeDelegate.checkedChanged(checked)
-                        }
-                        selection != null -> selection.onPick()
-                        else -> row.onClickDelegate.click("row")
-                    }
-                }
-            }
-            .padding(horizontal = 14.dp, vertical = 10.dp),
-        verticalAlignment = Alignment.CenterVertically,
-    ) {
-        if (selection != null) {
-            RadioButton(selected = selection.selected, onClick = null)
-            Spacer(Modifier.width(12.dp))
-        }
-        row.image?.let {
-            CarGlyph(it, Modifier.size(28.dp))
-            Spacer(Modifier.width(12.dp))
-        }
-        // large only changes how much room a row gets (more lines, a bigger icon above) - the
-        // type itself is the same scale as every other row, so a pane's one row and a plain
-        // list's tenth row read as the same kind of text.
-        Column(Modifier.weight(1f)) {
-            Text(
-                row.title.text(),
-                style = ChromeType.title,
-                maxLines = if (large) 2 else 1,
-                overflow = TextOverflow.Ellipsis,
-            )
-            row.texts.orEmpty().take(if (large) 3 else 2).forEach { line ->
-                Text(
-                    line.text(),
-                    style = ChromeType.body,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                    maxLines = if (large) 2 else 1,
-                    overflow = TextOverflow.Ellipsis,
-                )
-            }
-        }
-        ActionRow(row.actions.orEmpty())
-        if (toggle != null) {
-            Spacer(Modifier.width(8.dp))
-            Switch(checked = checked, onCheckedChange = null, enabled = row.isEnabled)
-        }
-    }
-}
-
-/** A row's place in a single-choice list: whether it is the chosen one, and what picking it does. */
-internal class RowSelection(val selected: Boolean, val onPick: () -> Unit)
-
-/**
- * Whether this colour stands out against the background that [content] was chosen for: at least
- * 3:1, the WCAG minimum for icons. The background is taken as the opposite of the content colour.
- */
-private fun Color.readableOn(content: Color): Boolean {
-    val background = if (content.luminanceIsDark()) Color.White else Color(0xFF121212)
-    val a = luminance() + 0.05f
-    val b = background.luminance() + 0.05f
-    return maxOf(a, b) / minOf(a, b) >= 3f
-}
-
 internal fun Color.luminanceIsDark(): Boolean =
     (red * 0.299f + green * 0.587f + blue * 0.114f) < 0.5f
 

gearslip/src/main/java/app/seb3thehacker/gearslip/car/TemplateRows.kt

@@ -0,0 +1,393 @@
+package app.seb3thehacker.gearslip.car
+
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
+import app.seb3thehacker.gearslip.car.theme.*
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.remember
+import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.material3.LocalContentColor
+import androidx.compose.ui.graphics.ColorFilter
+import androidx.compose.ui.graphics.luminance
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.foundation.Image
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.lazy.grid.items
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Call
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.filled.Menu
+import androidx.compose.material.icons.filled.Warning
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import app.seb3thehacker.gearslip.host.selected
+import app.seb3thehacker.gearslip.host.checkedChanged
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.material3.RadioButton
+import androidx.compose.material3.Switch
+import androidx.core.graphics.drawable.toBitmap
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.input.pointer.PointerEventPass
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.draw.alpha
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.Shape
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.car.app.model.Action
+import androidx.car.app.model.ActionStrip
+import androidx.car.app.model.CarIcon
+import androidx.car.app.model.GridItem
+import androidx.car.app.model.Header
+import androidx.car.app.model.ItemList
+import androidx.car.app.model.Pane
+import androidx.car.app.model.Row as CarRow
+import androidx.car.app.model.Template
+import app.seb3thehacker.gearslip.host.click
+import app.seb3thehacker.gearslip.host.color
+import app.seb3thehacker.gearslip.host.image
+import app.seb3thehacker.gearslip.host.isDrawable
+import app.seb3thehacker.gearslip.host.standardType
+import app.seb3thehacker.gearslip.host.text
+
+// Lists, grids, panes and rows of templated apps. Split out of TemplateParts.kt.
+
+@Composable
+internal fun PaneTitle(title: String) {
+    if (title.isEmpty()) return
+    Text(
+        title,
+        style = ChromeType.title,
+        modifier = Modifier.padding(horizontal = 14.dp, vertical = 10.dp),
+    )
+}
+
+@Composable
+internal fun ItemListColumn(
+    single: ItemList?,
+    sectioned: List<ItemList>? = null,
+    modifier: Modifier = Modifier,
+) {
+    val rows = buildList {
+        single?.items?.filterIsInstance<CarRow>()?.let(::addAll)
+        sectioned?.forEach { list -> addAll(list.items.filterIsInstance<CarRow>()) }
+    }
+    if (rows.isEmpty()) {
+        val message = single?.noItemsMessage.text()
+        if (message.isNotEmpty()) Text(message, Modifier.padding(14.dp), style = ChromeType.body)
+        return
+    }
+    // A list the app made selectable is a single-choice list: one option chosen, shown as a radio.
+    val onSelected = single?.onSelectedDelegate
+    val chosen = single?.selectedIndex ?: -1
+    LazyColumn(modifier, contentPadding = PaddingValues(bottom = 8.dp)) {
+        itemsIndexed(rows) { index, row ->
+            RowItem(row, onSelected?.let { RowSelection(index == chosen) { it.selected(index) } })
+        }
+    }
+}
+
+/** A grid of tappable tiles - what apps use for a home screen beside the map. Icons here are as
+ * often a small menu glyph (Organic Maps' Search, say) as real cover art, so the tile stays
+ * modest; [GridTile]'s own default is for the shelf case, where every tile is a photo. */
+@Composable
+internal fun GridItems(list: ItemList?, modifier: Modifier = Modifier) {
+    val items = list?.items?.filterIsInstance<GridItem>().orEmpty()
+    if (items.isEmpty()) return
+    LazyVerticalGrid(
+        columns = GridCells.Adaptive(84.dp),
+        modifier = modifier,
+        contentPadding = PaddingValues(horizontal = 8.dp, vertical = 4.dp),
+        horizontalArrangement = Arrangement.spacedBy(6.dp),
+        verticalArrangement = Arrangement.spacedBy(6.dp),
+    ) {
+        items(items) { item -> GridTile(item, iconSize = 36.dp) }
+    }
+}
+
+/**
+ * One cover-art tile: an app's own icon over a title and optional subtitle. Shared by
+ * [GridItems] (a whole screen of tiles, [iconSize] scaled down there to suit a plain menu glyph)
+ * and a section's horizontal shelf, which carries the same [GridItem] type but scrolls sideways
+ * instead of wrapping into a grid and wants its full-size cover art.
+ */
+@Composable
+internal fun GridTile(item: GridItem, modifier: Modifier = Modifier, iconSize: androidx.compose.ui.unit.Dp = 144.dp) {
+    Column(
+        modifier
+            .clickable { item.onClickDelegate.click("grid item") }
+            .padding(vertical = 8.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+    ) {
+        CarGlyph(item.image, Modifier.size(iconSize))
+        Spacer(Modifier.height(6.dp))
+        Text(
+            item.title.text(),
+            style = ChromeType.label,
+            maxLines = 1,
+            overflow = TextOverflow.Ellipsis,
+        )
+        val subtitle = item.text.text()
+        if (subtitle.isNotEmpty()) {
+            Text(
+                subtitle,
+                style = ChromeType.label,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+        }
+    }
+}
+
+/**
+ * [autoStart] is for a pane floating over a map - a place or a route the app is proposing - where
+ * a single action counts itself down rather than waiting to be pressed, on the theory that a
+ * driver glancing at the car screen has already decided. It never applies to more than one
+ * action: a pane offering a real choice (Start vs. something else) always waits to be tapped.
+ */
+@Composable
+internal fun PaneRows(pane: Pane?, modifier: Modifier = Modifier, autoStart: Boolean = false) {
+    // Some apps pad a pane with a row of blank strings; drawn, it is just a gap.
+    val rows = pane?.rows.orEmpty().filterNot { it.isBlank() }
+    val actions = pane?.actions.orEmpty().filter { it.isDrawable() }
+    val card = PlaceCard.of(rows)
+    Column(modifier) {
+        card.heading?.let { PlaceHeading(it) }
+        if (card.buttons.isNotEmpty()) RowButtons(card.buttons, Modifier.padding(horizontal = 14.dp, vertical = 6.dp))
+        if (autoStart && actions.size == 1) {
+            AutoStartButton(actions.single(), Modifier.padding(horizontal = 14.dp, vertical = 10.dp))
+        } else {
+            ActionRow(actions, Modifier.padding(horizontal = 14.dp, vertical = 10.dp), large = true)
+        }
+        if (card.heading == null && card.buttons.isEmpty()) {
+            card.details.forEach { RowItem(it, large = true) }
+        } else {
+            card.details.forEach { DetailRow(it, card.heading?.title?.text().orEmpty()) }
+        }
+    }
+}
+
+/**
+ * A pane split the way a place page reads: a name on top, the things to do with it as buttons,
+ * then the facts. Apps send all three as plain rows, so the split is worked out from the rows'
+ * shape alone. A pane that doesn't fit the shape - all of it tappable, like a menu - gets no
+ * heading and no buttons, and draws exactly as a plain list of rows.
+ */
+private class PlaceCard(val heading: CarRow?, val buttons: List<CarRow>, val details: List<CarRow>) {
+    companion object {
+        fun of(rows: List<CarRow>): PlaceCard {
+            // A short tappable row with an icon and nothing under it is a button in all but name:
+            // MAPS.ME's "Let's go" and "Save".
+            val buttons = rows.filter {
+                it.onClickDelegate != null && it.toggle == null && it.image != null &&
+                    it.texts.orEmpty().isEmpty() && it.title.text().length <= 24
+            }.takeIf { it.size in 1..4 && it.size < rows.size }.orEmpty()
+            // A first row that can't be tapped and has no icon is the place's name and kind.
+            val heading = rows.firstOrNull()?.takeIf {
+                buttons.isNotEmpty() && it.onClickDelegate == null && it.image == null && it.toggle == null
+            }
+            return PlaceCard(heading, buttons, rows - buttons.toSet() - listOfNotNull(heading).toSet())
+        }
+    }
+}
+
+@Composable
+private fun PlaceHeading(row: CarRow) {
+    Column(Modifier.fillMaxWidth().padding(horizontal = 14.dp, vertical = 6.dp)) {
+        Text(row.title.text(), style = ChromeType.title, maxLines = 2, overflow = TextOverflow.Ellipsis)
+        row.texts.orEmpty().take(2).forEach {
+            Text(it.text(), style = ChromeType.body, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1, overflow = TextOverflow.Ellipsis)
+        }
+    }
+}
+
+/** Button-shaped rows side by side, the first one filled as the thing most drivers came to do. */
+@Composable
+private fun RowButtons(rows: List<CarRow>, modifier: Modifier) {
+    val scheme = MaterialTheme.colorScheme
+    Row(modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+        rows.forEachIndexed { i, row ->
+            GsIconBox(
+                onClick = { row.onClickDelegate.click("row") },
+                modifier = Modifier.weight(1f),
+                colors = if (i == 0) GsColors(scheme.primary, scheme.onPrimary) else GsColors(scheme.surfaceContainerHighest, scheme.onSurface),
+                enabled = row.isEnabled,
+                shape = RoundedCornerShape(24.dp),
+            ) {
+                Row(
+                    Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 14.dp),
+                    horizontalArrangement = Arrangement.Center,
+                    verticalAlignment = Alignment.CenterVertically,
+                ) {
+                    CarGlyph(row.image, Modifier.size(24.dp))
+                    Spacer(Modifier.width(8.dp))
+                    Text(row.title.text(), style = ChromeType.body, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                }
+            }
+        }
+    }
+}
+
+/**
+ * One fact about a place, tighter than a list row: a small label over its value, or just the
+ * value when the row has no label. A phone number gets a Call button that asks first.
+ */
+@Composable
+private fun DetailRow(row: CarRow, placeName: String) {
+    val context = LocalContext.current
+    val texts = row.texts.orEmpty().map { it.text() }.filter { it.isNotBlank() }
+    val label = row.title.text().takeIf { texts.isNotEmpty() }
+    val values = texts.ifEmpty { listOf(row.title.text()) }
+    val number = values.firstOrNull { it.isPhoneNumber() }
+    val canCall = number != null &&
+        context.checkSelfPermission(android.Manifest.permission.CALL_PHONE) == android.content.pm.PackageManager.PERMISSION_GRANTED
+    Row(
+        Modifier
+            .fillMaxWidth()
+            .let { if (row.onClickDelegate != null && row.isEnabled) it.clickable { row.onClickDelegate.click("row") } else it }
+            .padding(horizontal = 14.dp, vertical = 6.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        row.image?.let {
+            CarGlyph(it, Modifier.size(24.dp))
+            Spacer(Modifier.width(12.dp))
+        }
+        Column(Modifier.weight(1f)) {
+            label?.let {
+                Text(it, style = MaterialTheme.typography.labelLarge, color = MaterialTheme.colorScheme.onSurfaceVariant, maxLines = 1)
+            }
+            values.take(3).forEach {
+                Text(it, style = ChromeType.body, maxLines = 2, overflow = TextOverflow.Ellipsis)
+            }
+        }
+        if (canCall) {
+            Spacer(Modifier.width(8.dp))
+            GsIconBox(
+                onClick = { CallPrompt.ask(placeName.ifBlank { number!! }, number!!) },
+                colors = GsColors(MaterialTheme.colorScheme.primary, MaterialTheme.colorScheme.onPrimary),
+                shape = RoundedCornerShape(24.dp),
+            ) {
+                Row(Modifier.padding(horizontal = 16.dp, vertical = 10.dp), verticalAlignment = Alignment.CenterVertically) {
+                    androidx.compose.material3.Icon(Icons.Filled.Call, null, Modifier.size(20.dp))
+                    Spacer(Modifier.width(6.dp))
+                    Text(stringResource(R.string.dialer_call), style = ChromeType.body)
+                }
+            }
+        }
+        ActionRow(row.actions.orEmpty())
+    }
+}
+
+/** A line that is only a phone number: digits with the usual separators, 7 to 15 digits long. */
+private fun String.isPhoneNumber(): Boolean {
+    val t = trim()
+    if (!Regex("""^\+?[0-9 ().\-]+$""").matches(t)) return false
+    return t.count { it.isDigit() } in 7..15
+}
+
+@Composable
+internal fun RowItem(row: CarRow, selection: RowSelection? = null, large: Boolean = false) {
+    val toggle = row.toggle
+    // Shown at once and corrected when the app answers with its own template, so the switch
+    // never lags a tap; keyed on what the app last said so its answer wins.
+    var checked by remember(toggle?.isChecked) { mutableStateOf(toggle?.isChecked == true) }
+    val clickable = row.isEnabled && (toggle != null || selection != null || row.onClickDelegate != null)
+    Row(
+        Modifier
+            .fillMaxWidth()
+            .let {
+                if (!clickable) it else it.clickable {
+                    when {
+                        toggle != null -> {
+                            checked = !checked
+                            toggle.onCheckedChangeDelegate.checkedChanged(checked)
+                        }
+                        selection != null -> selection.onPick()
+                        else -> row.onClickDelegate.click("row")
+                    }
+                }
+            }
+            .padding(horizontal = 14.dp, vertical = 10.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        if (selection != null) {
+            RadioButton(selected = selection.selected, onClick = null)
+            Spacer(Modifier.width(12.dp))
+        }
+        row.image?.let {
+            CarGlyph(it, Modifier.size(28.dp))
+            Spacer(Modifier.width(12.dp))
+        }
+        // large only changes how much room a row gets (more lines, a bigger icon above) - the
+        // type itself is the same scale as every other row, so a pane's one row and a plain
+        // list's tenth row read as the same kind of text.
+        Column(Modifier.weight(1f)) {
+            Text(
+                row.title.text(),
+                style = ChromeType.title,
+                maxLines = if (large) 2 else 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+            row.texts.orEmpty().take(if (large) 3 else 2).forEach { line ->
+                Text(
+                    line.text(),
+                    style = ChromeType.body,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = if (large) 2 else 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
+        }
+        ActionRow(row.actions.orEmpty())
+        if (toggle != null) {
+            Spacer(Modifier.width(8.dp))
+            Switch(checked = checked, onCheckedChange = null, enabled = row.isEnabled)
+        }
+    }
+}
+
+/** A row's place in a single-choice list: whether it is the chosen one, and what picking it does. */
+internal class RowSelection(val selected: Boolean, val onPick: () -> Unit)
+
+/**
+ * Whether this colour stands out against the background that [content] was chosen for: at least
+ * 3:1, the WCAG minimum for icons. The background is taken as the opposite of the content colour.
+ */
+internal fun Color.readableOn(content: Color): Boolean {
+    val background = if (content.luminanceIsDark()) Color.White else Color(0xFF121212)
+    val a = luminance() + 0.05f
+    val b = background.luminance() + 0.05f
+    return maxOf(a, b) / minOf(a, b) >= 3f
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/VehicleDataScreen.kt

@@ -1,5 +1,6 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -27,7 +28,7 @@ import androidx.compose.ui.unit.dp
 fun VehicleDataScreen() {
     val readings by CarSensors.readings.collectAsState()
 
-    Column(Modifier.fillMaxSize().padding(horizontal = 24.dp, vertical = 16.dp)) {
+    Column(Modifier.fillMaxSize().padding(start = 24.dp, end = 24.dp, top = 16.dp)) {
         ScreenHeader("Vehicle data")
         Text(
             "Raw sensor channel from the connected head unit. Field meaning is a best guess - " +
@@ -46,7 +47,7 @@ fun VehicleDataScreen() {
             return@Column
         }
 
-        LazyColumn(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+        LazyColumn(contentPadding = PaddingValues(bottom = 16.dp), verticalArrangement = Arrangement.spacedBy(8.dp)) {
             items(readings, key = { it.typeId }) { reading -> ReadingRow(reading) }
         }
     }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/Weather.kt

@@ -1,5 +1,9 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.stringResource
+import androidx.annotation.StringRes
+import app.seb3thehacker.gearslip.R
 import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
@@ -38,7 +42,7 @@ class WeatherData(
 
 sealed interface WeatherState {
     data object Loading : WeatherState
-    data class Unavailable(val reason: String) : WeatherState
+    data class Unavailable(@param:StringRes val reason: Int) : WeatherState
     data class Ready(val data: WeatherData) : WeatherState
 }
 
@@ -78,7 +82,7 @@ object Weather {
             if (flow.value !is WeatherState.Ready) {
                 val allowed = hasLocationPermission(context)
                 flow.value = WeatherState.Unavailable(
-                    if (allowed) "Waiting for a location fix." else "Allow location for Gearslip on the phone to see the weather.",
+                    if (allowed) R.string.weather_waiting_fix else R.string.weather_allow_location,
                 )
             }
             return
@@ -92,7 +96,7 @@ object Weather {
             // No place name: logs get shared in bug reports.
             GearslipLog.i("weather: loaded")
         }
-        else if (flow.value !is WeatherState.Ready) flow.value = WeatherState.Unavailable("Could not reach the weather service.")
+        else if (flow.value !is WeatherState.Ready) flow.value = WeatherState.Unavailable(R.string.weather_unreachable)
     }
 
     // --- location -------------------------------------------------------------------------
@@ -197,6 +201,26 @@ object Weather {
         )
     }
 
+    /** Open-Meteo's WMO weather codes, in words on the screen. [describe] is the English the assistant says. */
+    @StringRes
+    fun conditionRes(code: Int): Int = when (code) {
+        0 -> R.string.weather_clear
+        1 -> R.string.weather_mostly_clear
+        2 -> R.string.weather_partly_cloudy
+        3 -> R.string.weather_overcast
+        45, 48 -> R.string.weather_fog
+        in 51..57 -> R.string.weather_drizzle
+        in 61..67 -> R.string.weather_rain
+        in 71..77 -> R.string.weather_snow
+        in 80..82 -> R.string.weather_rain_showers
+        in 85..86 -> R.string.weather_snow_showers
+        in 95..99 -> R.string.weather_thunderstorm
+        else -> 0
+    }
+
+    @Composable
+    fun condition(code: Int): String = conditionRes(code).let { if (it == 0) "-" else stringResource(it) }
+
     /** Open-Meteo's WMO weather codes, in words. */
     fun describe(code: Int): String = when (code) {
         0 -> "Clear"

gearslip/src/main/java/app/seb3thehacker/gearslip/car/WeatherScreen.kt

@@ -1,5 +1,7 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -41,11 +43,11 @@ fun WeatherScreen() {
         Modifier.fillMaxSize().verticalScroll(rememberScrollState()).padding(horizontal = 24.dp, vertical = 16.dp),
         verticalArrangement = Arrangement.spacedBy(20.dp),
     ) {
-        ScreenHeader("Weather")
+        ScreenHeader(stringResource(R.string.crumb_weather))
         when (val s = state) {
-            WeatherState.Loading -> Text("Getting the weather…", style = MaterialTheme.typography.titleMedium)
+            WeatherState.Loading -> Text(stringResource(R.string.weather_getting), style = MaterialTheme.typography.titleMedium)
             is WeatherState.Unavailable -> Text(
-                s.reason, style = MaterialTheme.typography.titleMedium,
+                stringResource(s.reason), style = MaterialTheme.typography.titleMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
             is WeatherState.Ready -> Forecast(s.data)
@@ -66,18 +68,18 @@ private fun Forecast(w: WeatherData) {
             WeatherIcon(w.code, w.isDay, size = 88.dp)
             Column {
                 Text("${w.temp}${w.tempUnit}", fontSize = 56.sp, fontWeight = FontWeight.Bold)
-                Text(Weather.describe(w.code), style = MaterialTheme.typography.titleLarge)
+                Text(Weather.condition(w.code), style = MaterialTheme.typography.titleLarge)
             }
             Spacer(Modifier.weight(1f))
             Column(horizontalAlignment = Alignment.End, verticalArrangement = Arrangement.spacedBy(4.dp)) {
-                Text("Feels like ${w.feelsLike}${w.tempUnit}", style = MaterialTheme.typography.bodyLarge)
-                Text("Humidity ${w.humidity}%", style = MaterialTheme.typography.bodyLarge)
-                Text("Wind ${w.wind} ${w.windUnit}", style = MaterialTheme.typography.bodyLarge)
+                Text(stringResource(R.string.weather_feels_like, "${w.feelsLike}${w.tempUnit}"), style = MaterialTheme.typography.bodyLarge)
+                Text(stringResource(R.string.weather_humidity, w.humidity), style = MaterialTheme.typography.bodyLarge)
+                Text(stringResource(R.string.weather_wind, "${w.wind} ${w.windUnit}"), style = MaterialTheme.typography.bodyLarge)
             }
         }
     }
 
-    Text("Next hours", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+    Text(stringResource(R.string.weather_next_hours), style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
     LazyRow(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
         items(w.hours) { h ->
             Surface(color = MaterialTheme.colorScheme.surfaceContainerHigh, shape = MaterialTheme.shapes.large) {
@@ -101,7 +103,7 @@ private fun Forecast(w: WeatherData) {
         }
     }
 
-    Text("This week", style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
+    Text(stringResource(R.string.weather_this_week), style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.primary)
     Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
         w.days.forEachIndexed { i, d ->
             Surface(color = MaterialTheme.colorScheme.surfaceContainerHigh, shape = MaterialTheme.shapes.large) {
@@ -111,11 +113,11 @@ private fun Forecast(w: WeatherData) {
                     horizontalArrangement = Arrangement.spacedBy(16.dp),
                 ) {
                     Text(
-                        if (i == 0) "Today" else SimpleDateFormat("EEEE", Locale.getDefault()).format(Date(d.date)),
+                        if (i == 0) stringResource(R.string.weather_today) else SimpleDateFormat("EEEE", Locale.getDefault()).format(Date(d.date)),
                         Modifier.width(120.dp), style = MaterialTheme.typography.bodyLarge, fontWeight = FontWeight.SemiBold,
                     )
                     WeatherIcon(d.code, true, size = 28.dp)
-                    Text(Weather.describe(d.code), Modifier.weight(1f), style = MaterialTheme.typography.bodyMedium)
+                    Text(Weather.condition(d.code), Modifier.weight(1f), style = MaterialTheme.typography.bodyMedium)
                     if (d.rainChance > 0) Text("${d.rainChance}%", color = MaterialTheme.colorScheme.primary)
                     Text("${d.low}° / ${d.high}°", style = MaterialTheme.typography.bodyLarge)
                 }
@@ -123,7 +125,7 @@ private fun Forecast(w: WeatherData) {
         }
     }
     Text(
-        "Weather data by Open-Meteo.com (CC BY 4.0)",
+        stringResource(R.string.weather_credit),
         style = MaterialTheme.typography.labelSmall, color = MaterialTheme.colorScheme.onSurfaceVariant,
     )
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/WebApp.kt

@@ -1,8 +1,17 @@
 package app.seb3thehacker.gearslip.car
 
+import androidx.compose.ui.res.stringResource
+import app.seb3thehacker.gearslip.R
 import android.os.Handler
 import android.os.Looper
+import android.view.View
+import android.view.ViewGroup
 import android.webkit.JavascriptInterface
+import android.webkit.WebChromeClient
+import android.widget.FrameLayout
+import androidx.compose.foundation.layout.Box
+import androidx.compose.runtime.LaunchedEffect
+import app.seb3thehacker.gearslip.car.theme.GsIconButton
 import android.webkit.WebResourceError
 import android.webkit.WebResourceRequest
 import android.webkit.WebResourceResponse
@@ -24,6 +33,10 @@ import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.viewinterop.AndroidView
 import app.seb3thehacker.gearslip.GearslipLog
 import org.json.JSONObject
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material.icons.filled.Refresh
+import androidx.compose.material.icons.filled.Home
+import androidx.compose.material.icons.automirrored.filled.ArrowForward
 
 /**
  * A browser inside the car UI. [content] is a URL, or raw HTML when it does not look like one.
@@ -43,11 +56,35 @@ fun WebApp(content: String) {
     val ring = String.format("#%06X", MaterialTheme.colorScheme.primary.toArgb() and 0xFFFFFF)
     var web by remember { mutableStateOf<WebView?>(null) }
     var fieldText by remember { mutableStateOf<String?>(null) }
+    // A page's own full screen, such as a video's: the view to show, and how to hand it back.
+    var pageFullscreen by remember { mutableStateOf<Pair<View, WebChromeClient.CustomViewCallback>?>(null) }
+    // Whether the video asked for full screen, rather than the driver from the header: ending
+    // the video's then leaves full screen too, instead of stranding them in it.
+    var videoMadeFullscreen by remember { mutableStateOf(false) }
+    val fullscreen = CarFullscreen.active
+    // What the header shows and what its buttons can do, refreshed as pages load.
+    var pageTitle by remember { mutableStateOf("") }
+    var canGoForward by remember { mutableStateOf(false) }
+    // The address being typed, or null while the header shows the page title.
+    var address by remember { mutableStateOf<String?>(null) }
+
+    // Leaving the browser ends full screen, whoever started it.
+    DisposableEffect(Unit) { onDispose { CarFullscreen.exit() } }
+    // The way out of full screen also ends the page's.
+    LaunchedEffect(fullscreen) {
+        if (!fullscreen) pageFullscreen?.let { (_, callback) ->
+            pageFullscreen = null
+            callback.onCustomViewHidden()
+        }
+    }
 
     DisposableEffect(web) {
         navigator.backInterceptor = {
             val view = web
-            if (view != null && view.canGoBack()) {
+            if (CarFullscreen.active) {
+                CarFullscreen.exit()
+                true
+            } else if (view != null && view.canGoBack()) {
                 view.goBack()
                 true
             } else {
@@ -59,25 +96,57 @@ fun WebApp(content: String) {
 
     Column(Modifier.fillMaxSize()) {
         // Back steps through the page's history first (the interceptor above), then leaves.
-        ScreenHeader("Browser", Modifier.padding(horizontal = 16.dp, vertical = 8.dp))
+        if (!fullscreen) {
+            ScreenHeader(pageTitle.ifEmpty { stringResource(R.string.app_browser) }, Modifier.padding(horizontal = 16.dp, vertical = 8.dp)) {
+                GsIconButton(androidx.compose.material.icons.Icons.Filled.Search, stringResource(R.string.web_search), {
+                    fieldText = null
+                    address = ""
+                })
+                if (canGoForward) {
+                    GsIconButton(androidx.compose.material.icons.Icons.AutoMirrored.Filled.ArrowForward, stringResource(R.string.web_forward), { web?.goForward() })
+                }
+                GsIconButton(androidx.compose.material.icons.Icons.Filled.Refresh, stringResource(R.string.web_reload), { web?.reload() })
+                GsIconButton(androidx.compose.material.icons.Icons.Filled.Home, stringResource(R.string.web_start_page), {
+                    web?.let { view -> loadContent(view, content) }
+                })
+                GsIconButton(MediaIcons.Fullscreen, stringResource(R.string.web_fullscreen), CarFullscreen::enter)
+            }
+        }
+        Box(Modifier.weight(1f).fillMaxSize()) {
         AndroidView(
-            modifier = Modifier.weight(1f).fillMaxSize(),
+            modifier = Modifier.fillMaxSize(),
             factory = { context ->
                 WebView(context).apply {
                     settings.javaScriptEnabled = true
                     settings.domStorageEnabled = true
                     settings.loadWithOverviewMode = true
                     settings.useWideViewPort = true
-                    webViewClient = LoggingClient(ring)
+                    webViewClient = LoggingClient(ring) { view ->
+                        canGoForward = view.canGoForward()
+                        pageTitle = view.title.orEmpty().takeUnless { it.startsWith("http") || it == "about:blank" }.orEmpty()
+                    }
+                    webChromeClient = object : WebChromeClient() {
+                        override fun onReceivedTitle(view: WebView?, title: String?) {
+                            pageTitle = title.orEmpty().takeUnless { it.startsWith("http") || it == "about:blank" }.orEmpty()
+                        }
+
+                        override fun onShowCustomView(view: View, callback: CustomViewCallback) {
+                            videoMadeFullscreen = !CarFullscreen.active
+                            pageFullscreen = view to callback
+                            CarFullscreen.enter()
+                        }
+
+                        override fun onHideCustomView() {
+                            if (pageFullscreen == null) return
+                            pageFullscreen = null
+                            if (videoMadeFullscreen) CarFullscreen.exit()
+                        }
+                    }
                     addJavascriptInterface(
                         FieldFocusBridge(onFocus = { fieldText = it }, onBlur = { fieldText = null }),
                         "GearslipField",
                     )
-                    if (content.startsWith("http://") || content.startsWith("https://")) {
-                        loadUrl(content)
-                    } else {
-                        loadDataWithBaseURL(null, content, "text/html", "utf-8", null)
-                    }
+                    loadContent(this, content)
                     web = this
                 }
             },
@@ -85,6 +154,33 @@ fun WebApp(content: String) {
             update = { it.settings.isAlgorithmicDarkeningAllowed = darkOutside },
             onRelease = { it.destroy() },
         )
+        pageFullscreen?.let { (view, _) ->
+            androidx.compose.runtime.key(view) {
+                AndroidView(
+                    factory = { context ->
+                        FrameLayout(context).apply {
+                            setBackgroundColor(android.graphics.Color.BLACK)
+                            (view.parent as? ViewGroup)?.removeView(view)
+                            addView(view, FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT))
+                        }
+                    },
+                    modifier = Modifier.fillMaxSize(),
+                    onRelease = { it.removeAllViews() },
+                )
+            }
+        }
+        }
+        address?.let { typed ->
+            CarKeyboard(
+                text = typed,
+                onTextChange = { address = it },
+                onSubmit = {
+                    web?.loadUrl(addressToUrl(typed))
+                    address = null
+                },
+                onDismiss = { address = null },
+            )
+        }
         fieldText?.let { text ->
             CarKeyboard(
                 text = text,
@@ -102,9 +198,29 @@ fun WebApp(content: String) {
     }
 }
 
-private class LoggingClient(private val ring: String) : WebViewClient() {
+/** The start page: a web address, or a page of HTML Gearslip made itself. */
+private fun loadContent(view: WebView, content: String) {
+    if (content.startsWith("http://") || content.startsWith("https://")) {
+        view.loadUrl(content)
+    } else {
+        view.loadDataWithBaseURL(null, content, "text/html", "utf-8", null)
+    }
+}
+
+/** Something that looks like an address opens as one; anything else is searched for. */
+private fun addressToUrl(typed: String): String {
+    val text = typed.trim()
+    return when {
+        text.startsWith("http://") || text.startsWith("https://") -> text
+        ' ' !in text && '.' in text -> "https://$text"
+        else -> "https://duckduckgo.com/?q=" + java.net.URLEncoder.encode(text, "UTF-8")
+    }
+}
+
+private class LoggingClient(private val ring: String, private val onLoaded: (WebView) -> Unit) : WebViewClient() {
     override fun onPageFinished(view: WebView?, url: String?) {
         GearslipLog.i("car web page loaded: $url")
+        view?.let(onLoaded)
         view?.evaluateJavascript(FOCUS_TRACKING_JS, null)
         view?.evaluateJavascript(focusRingJs(ring), null)
     }

gearslip/src/main/java/app/seb3thehacker/gearslip/car/theme/CarColors.kt

@@ -0,0 +1,84 @@
+package app.seb3thehacker.gearslip.car.theme
+
+import androidx.compose.material3.ColorScheme
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.compositeOver
+import androidx.compose.ui.graphics.lerp
+
+/**
+ * The phone's Material You colours, with its accent washed over the surfaces. Material You's own
+ * surfaces are nearly neutral, which reads as flat grey on a car screen; tinting them with the
+ * phone's primary colour (purple on a purple phone) gives the whole UI the phone's hue, the way
+ * Material 3's surface tint does, and it changes with the wallpaper like everything else.
+ * Higher containers take more of the tint, so cards still stand off the background.
+ */
+fun ColorScheme.withTintedSurfaces(dark: Boolean, style: DarkStyle = DarkStyle.GREY): ColorScheme {
+    if (dark && style != DarkStyle.GREY) return withDarkStyle(style)
+    val base = if (dark) 0.03f else 0.02f
+    fun tint(own: Color, step: Int) = primary.copy(alpha = base + step * (if (dark) 0.015f else 0.01f)).compositeOver(own)
+    return copy(
+        background = tint(background, 0),
+        surface = tint(surface, 0),
+        surfaceDim = tint(surfaceDim, 0),
+        surfaceContainerLowest = tint(surfaceContainerLowest, 0),
+        surfaceContainerLow = tint(surfaceContainerLow, 1),
+        surfaceContainer = tint(surfaceContainer, 2),
+        surfaceContainerHigh = tint(surfaceContainerHigh, 3),
+        surfaceContainerHighest = tint(surfaceContainerHighest, 4),
+        surfaceBright = tint(surfaceBright, 4),
+        surfaceVariant = tint(surfaceVariant, 3),
+    )
+}
+
+/**
+ * How dark the car's dark mode goes. [GREY] is Material You's own dark, with the tint above;
+ * the others are darker, and the two colour ones take their hue from the phone's accent.
+ */
+enum class DarkStyle { GREY, BLACK, DEEP_COLOUR, BLACK_COLOUR }
+
+/**
+ * The surfaces rebuilt at [style]'s brightness, from the background up to the highest container.
+ * The levels are 0-255 greys; each surface keeps Material You's own slight hue at that level.
+ */
+private fun ColorScheme.withDarkStyle(style: DarkStyle): ColorScheme {
+    val levels = when (style) {
+        DarkStyle.BLACK -> listOf(0f, 12f, 17f, 25f, 34f)
+        DarkStyle.DEEP_COLOUR -> listOf(11f, 19f, 24f, 32f, 41f)
+        else -> listOf(0f, 17f, 22f, 30f, 39f)
+    }
+    val colour = style != DarkStyle.BLACK
+    // The accent's saturated container colour, not the pastel accent itself: tinting with the
+    // pastel only makes a surface lighter, where this one gives it colour at the same brightness.
+    fun at(own: Color, step: Int): Color {
+        val level = levels[step] / 255f
+        if (level == 0f) return Color.Black
+        val neutral = own.scaledTo(level)
+        return if (colour) {
+            lerp(neutral, primaryContainer.scaledTo(level), (0.6f + 0.08f * step).coerceAtMost(0.95f))
+        } else {
+            primary.copy(alpha = 0.02f + 0.015f * step).compositeOver(neutral)
+        }
+    }
+    return copy(
+        // Grey text that read fine on grey looks dim on black, so it moves a little towards white.
+        onSurfaceVariant = lerp(onSurfaceVariant, onSurface, 0.3f),
+        background = at(background, 0),
+        surface = at(surface, 0),
+        surfaceDim = at(surfaceDim, 0),
+        surfaceContainerLowest = at(surfaceContainerLowest, 0),
+        surfaceContainerLow = at(surfaceContainerLow, 1),
+        surfaceContainer = at(surfaceContainer, 2),
+        surfaceContainerHigh = at(surfaceContainerHigh, 3),
+        surfaceContainerHighest = at(surfaceContainerHighest, 4),
+        surfaceBright = at(surfaceBright, 4),
+        surfaceVariant = at(surfaceVariant, 3),
+    )
+}
+
+/** This colour's hue at an average brightness of [level], 0 to 1. */
+private fun Color.scaledTo(level: Float): Color {
+    val mean = (red + green + blue) / 3f
+    if (mean <= 0f) return Color(level, level, level)
+    val k = level / mean
+    return Color((red * k).coerceAtMost(1f), (green * k).coerceAtMost(1f), (blue * k).coerceAtMost(1f))
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/car/theme/GsControls.kt

@@ -9,6 +9,7 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.draw.drawBehind
+import androidx.compose.ui.draw.dropShadow
 import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.drawOutline
 import androidx.compose.ui.graphics.drawscope.DrawScope
@@ -172,6 +173,46 @@ fun Modifier.gsSurface(
  * outlines: cheap, works on every API level, and already soft enough that the car's video
  * compression has nothing crisp to smear.
  */
+/**
+ * The current theme's shadow under a panel floating over the map, such as the docked player.
+ * Draws nothing in a look without one.
+ */
+@Composable
+fun Modifier.gsPanelShadow(shape: Shape): Modifier {
+    val look = gsLook()
+    if (look.panelShadow <= 0.dp || look.panelShadowAlpha <= 0f) return this
+    // A real blur, as soft as the nav bar's gradient and as strong: stacked outlines showed as
+    // rings around a card this big.
+    return dropShadow(
+        shape,
+        androidx.compose.ui.graphics.shadow.Shadow(
+            radius = look.panelShadow * 3,
+            color = Color.Black.copy(alpha = look.panelShadowAlpha * 0.6f),
+            offset = androidx.compose.ui.unit.DpOffset(0.dp, look.panelShadow / 2),
+        ),
+    )
+}
+
+/** The same shadow cast upwards from the top edge of a bar along the bottom of the screen. */
+@Composable
+fun Modifier.gsBarShadow(): Modifier {
+    val look = gsLook()
+    if (look.panelShadow <= 0.dp || look.panelShadowAlpha <= 0f) return this
+    return drawBehind {
+        val reach = look.panelShadow.toPx() * 1.5f
+        drawRect(
+            Brush.verticalGradient(
+                0f to Color.Transparent,
+                1f to Color.Black.copy(alpha = look.panelShadowAlpha * 0.6f),
+                startY = -reach,
+                endY = 0f,
+            ),
+            topLeft = androidx.compose.ui.geometry.Offset(0f, -reach),
+            size = Size(size.width, reach),
+        )
+    }
+}
+
 private fun DrawScope.drawSoftShadow(shape: Shape, elevation: Float, alpha: Float, lift: Float) {
     if (alpha <= 0f) return
     val blur = elevation * 2f

gearslip/src/main/java/app/seb3thehacker/gearslip/car/theme/GsTheme.kt

@@ -64,6 +64,12 @@ data class ControlLook(
      * from; a flat look takes the dot.
      */
     val holdMarker: HoldMarkerStyle = HoldMarkerStyle.PEEL,
+    /**
+     * The shadow a panel floating over the map casts onto it (the docked player, the lyrics), and
+     * the nav bar casts up. 0 for none, so a flat look stays flat.
+     */
+    val panelShadow: Dp = 0.dp,
+    val panelShadowAlpha: Float = 0f,
     /** Replaces this look when the UI is light, for effects that only work on one background. */
     val light: ControlLook? = null,
 )
@@ -72,7 +78,11 @@ object GsThemes {
     val Keycap = GsTheme(
         id = "keycap",
         name = "Keycap",
-        control = ControlLook(lip = 4.dp, pressedScale = 1f, holdMarker = HoldMarkerStyle.PEEL),
+        // Short and dark, like the keys' own solid base.
+        control = ControlLook(
+            lip = 4.dp, pressedScale = 1f, holdMarker = HoldMarkerStyle.PEEL,
+            panelShadow = 4.dp, panelShadowAlpha = 0.45f,
+        ),
     )
 
     val Tactile = GsTheme(
@@ -89,6 +99,8 @@ object GsThemes {
             pressedDim = 0.12f,
             pressedScale = 1f,
             holdMarker = HoldMarkerStyle.PEEL,
+            panelShadow = 12.dp,
+            panelShadowAlpha = 0.42f,
             // A wide soft shadow bands once the car's video stream compresses it on a light
             // background, so light mode gets a tight one and leans on the bevel instead.
             light = ControlLook(
@@ -102,6 +114,8 @@ object GsThemes {
                 pressedDim = 0.12f,
                 pressedScale = 1f,
                 holdMarker = HoldMarkerStyle.PEEL,
+                panelShadow = 4.dp,
+                panelShadowAlpha = 0.22f,
             ),
         ),
     )

gearslip/src/main/java/app/seb3thehacker/gearslip/host/CarAppCatalog.kt

@@ -13,6 +13,9 @@ class TemplateApp(
 ) {
     val isNavigation: Boolean get() = CarAppService.CATEGORY_NAVIGATION_APP in categories
 
+    /** A media car screen, or one that names no category (older media apps). */
+    val isMediaScreen: Boolean get() = kind == "media" || kind == "app"
+
     /** "navigation", "media", ... - what the app told the system it is. */
     val kind: String
         get() = categories.firstOrNull { it.startsWith(CATEGORY_PREFIX) }

gearslip/src/main/java/app/seb3thehacker/gearslip/host/CarAppConnection.kt

@@ -91,6 +91,9 @@ class CarAppConnection(private val context: Context) {
     private var navigationManager: INavigationManager? = null
     /** Main thread only, both of these - the handoff is a race between them either way round. */
     private var surfaceCallback: ISurfaceCallback? = null
+
+    /** Last visible and stable areas the UI reported, kept for the next surface. */
+    private var areas: Pair<Rect, Rect>? = null
     private var lent: Lent? = null
 
     private var binding: ServiceConnection? = null
@@ -223,6 +226,8 @@ class CarAppConnection(private val context: Context) {
     fun disconnect() = disconnect(keepLocation = false)
 
     private fun disconnect(keepLocation: Boolean) {
+        main.removeCallbacks(handshakeTimeout)
+        hardware.stop()
         clearToasts()
         lent?.let { sendSurfaceDestroyed(it) }
         lent = null
@@ -254,11 +259,24 @@ class CarAppConnection(private val context: Context) {
 
     // --- handshake ---------------------------------------------------------------------
 
+    /**
+     * An app that won't have Gearslip as its host never answers the first question. Car App
+     * Library 1.9 and later throw inside the app when a host that isn't Google's asks, and since
+     * the call is one-way the error never comes back, so without this the car would show
+     * "Starting..." for ever.
+     */
+    private val handshakeTimeout = Runnable {
+        if (_status.value.phase == Phase.HANDSHAKE) {
+            fail(Phase.REJECTED, "It didn't answer Gearslip. Apps built for newer versions of Android Auto only run on Google's.")
+        }
+    }
+
     private fun onBound(service: IBinder) {
         val app = ICarApp.Stub.asInterface(service)
         carApp = app
         update { it.copy(phase = Phase.HANDSHAKE, detail = "bound, asking for app info") }
         GearslipLog.i("host: bound; requesting app info")
+        main.postDelayed(handshakeTimeout, HANDSHAKE_TIMEOUT_MS)
 
         call("getAppInfo", onValue = { value ->
             val info = value as? AppInfo ?: return@call fail(Phase.FAILED, "app info was ${value?.javaClass?.simpleName}")
@@ -271,6 +289,7 @@ class CarAppConnection(private val context: Context) {
      * offers cannot be rendered correctly, so it is refused here rather than half-drawn.
      */
     private fun onAppInfo(info: AppInfo) {
+        main.removeCallbacks(handshakeTimeout)
         val negotiated = minOf(HOST_API_LEVEL, info.latestCarAppApiLevel)
         GearslipLog.i(
             "host: app api ${info.minCarAppApiLevel}..${info.latestCarAppApiLevel} " +
@@ -385,6 +404,8 @@ class CarAppConnection(private val context: Context) {
         // failure worth surfacing.
         runCatching {
             app.getManager(CarContext.NAVIGATION_SERVICE, object : IOnDoneCallback.Stub() {
+                // Car App Library 1.8 versions its host interfaces; each answers with the version it was built from.
+                override fun getInterfaceVersion(): Int = IOnDoneCallback.VERSION
                 override fun onSuccess(response: Bundleable?) {
                     val value = response?.let { runCatching { it.get() }.getOrNull() }
                     navigationManager = when (value) {
@@ -552,9 +573,11 @@ class CarAppConnection(private val context: Context) {
         // The app draws for the whole surface; the visible area is what isn't covered by host
         // chrome, and the stable area is the part that never gets covered. Both depend on the
         // template (see visibleAreaFor) and are reported by the UI via [reportAreas] once it
-        // has measured. Until then the whole surface is fair game.
+        // has measured. A fresh surface the same size keeps the last ones, since the UI only
+        // reports again when they change; until then the whole surface is fair game.
         val whole = Rect(0, 0, surface.width, surface.height)
-        reportAreas(whole, whole)
+        val last = areas?.takeIf { (visible, stable) -> whole.contains(visible) && whole.contains(stable) }
+        reportAreas(last?.first ?: whole, last?.second ?: whole)
 
         GearslipLog.i(
             "host: lent the app a ${surface.width}x${surface.height} @${surface.dpi}dpi surface"
@@ -575,7 +598,9 @@ class CarAppConnection(private val context: Context) {
 
     /** Tells the app which part of its surface the driver can actually see. */
     fun reportAreas(visible: Rect, stable: Rect) {
+        areas = visible to stable
         val callback = surfaceCallback ?: return
+        GearslipLog.i("host: areas for $appPackage: visible=${visible.toShortString()} stable=${stable.toShortString()}")
         runCatching { callback.onStableAreaChanged(stable, noop("onStableAreaChanged")) }
         runCatching { callback.onVisibleAreaChanged(visible, noop("onVisibleAreaChanged")) }
     }
@@ -605,6 +630,7 @@ class CarAppConnection(private val context: Context) {
     // --- host interfaces the app calls back into -----------------------------------------
 
     private fun createAppHost(owner: Any) = object : IAppHost.Stub() {
+        override fun getInterfaceVersion(): Int = IAppHost.VERSION
         override fun invalidate() {
             GearslipLog.i("host: app invalidated its template")
             main.post { requestTemplate() }
@@ -633,8 +659,16 @@ class CarAppConnection(private val context: Context) {
         }
 
         override fun sendLocation(location: Location?) = Unit
-        override fun showAlert(alert: Bundleable?) = Unit
-        override fun dismissAlert(alertId: Int) = Unit
+        override fun showAlert(alert: Bundleable?) {
+            val shown = runCatching { alert?.get() as? androidx.car.app.model.Alert }
+                .onFailure { GearslipLog.w("host: couldn't read an alert: ${it.message}") }
+                .getOrNull() ?: return
+            main.post { if (toastOwner === owner) app.seb3thehacker.gearslip.car.CarAlerts.show(owner, shown) }
+        }
+
+        override fun dismissAlert(alertId: Int) {
+            main.post { app.seb3thehacker.gearslip.car.CarAlerts.dismiss(owner, alertId) }
+        }
         override fun openMicrophone(request: Bundleable?): Bundleable? = null
     }
 
@@ -643,6 +677,7 @@ class CarAppConnection(private val context: Context) {
     val trip: StateFlow<androidx.car.app.navigation.model.Trip?> = _trip.asStateFlow()
 
     private val navigationHost = object : INavigationHost.Stub() {
+        override fun getInterfaceVersion(): Int = INavigationHost.VERSION
         override fun navigationStarted() {
             GearslipLog.i("host: navigation started")
             navigating = true
@@ -659,37 +694,25 @@ class CarAppConnection(private val context: Context) {
     }
 
     /**
-     * Answers car-hardware questions with "this car doesn't have that".
+     * Answers car-hardware questions from what the car itself sends: see [CarHardwareFeed].
      *
-     * A phone knows nothing about a car's sensors, so every answer here is "unsupported" - but
-     * it has to be an actual answer. Returning no binder for this service at all is what made
-     * Organic Maps crash in onAppStart: its CarSensorsManager assumes a host that offers the
-     * service, and the library's own "unsupported" path only runs once a reply arrives.
-     *
-     * The reply's Bundleable is ignored by the library whenever isSupported is false, but the
-     * IBinder must be a real IOnDoneCallback - the app dispatches the reply through it.
+     * Every question has to get an actual answer, even "unsupported". Returning no binder for
+     * this service at all is what made Organic Maps crash in onAppStart: its CarSensorsManager
+     * assumes a host that offers the service, and the library's own "unsupported" path only runs
+     * once a reply arrives. The reply's IBinder must be a real IOnDoneCallback: the app
+     * dispatches the reply through it.
      */
+    private val hardware = CarHardwareFeed { name -> noop(name).asBinder() }
+
     private val hardwareHost = object : ICarHardwareHost.Stub() {
-        override fun getCarHardwareResult(
-            type: Int,
-            params: Bundleable?,
-            result: ICarHardwareResult?,
-        ) = unsupported(type, result)
+        override fun getInterfaceVersion(): Int = ICarHardwareHost.VERSION
+        override fun getCarHardwareResult(type: Int, params: Bundleable?, result: ICarHardwareResult?) =
+            hardware.get(type, result)
 
-        override fun subscribeCarHardwareResult(
-            type: Int,
-            params: Bundleable?,
-            result: ICarHardwareResult?,
-        ) = unsupported(type, result)
+        override fun subscribeCarHardwareResult(type: Int, params: Bundleable?, result: ICarHardwareResult?) =
+            hardware.subscribe(type, result)
 
-        override fun unsubscribeCarHardwareResult(type: Int, params: Bundleable?) = Unit
-
-        private fun unsupported(type: Int, result: ICarHardwareResult?) {
-            val target = result ?: return
-            runCatching {
-                target.onCarHardwareResult(type, false, null, noop("carHardwareResult").asBinder())
-            }.onFailure { GearslipLog.w("host: could not answer hardware result $type") }
-        }
+        override fun unsubscribeCarHardwareResult(type: Int, params: Bundleable?) = hardware.unsubscribe(type)
     }
 
     /**
@@ -700,6 +723,7 @@ class CarAppConnection(private val context: Context) {
      * Library documents for a projected head unit; they are about the screen, not about us.
      */
     private val constraintHost = object : IConstraintHost.Stub() {
+        override fun getInterfaceVersion(): Int = IConstraintHost.VERSION
         override fun getContentLimit(type: Int): Int = when (type) {
             ConstraintManager.CONTENT_LIMIT_TYPE_GRID -> 12
             ConstraintManager.CONTENT_LIMIT_TYPE_PANE -> 4
@@ -718,10 +742,12 @@ class CarAppConnection(private val context: Context) {
      * that pushes suggestions shouldn't fail because its host doesn't surface them.
      */
     private val suggestionHost = object : ISuggestionHost.Stub() {
+        override fun getInterfaceVersion(): Int = ISuggestionHost.VERSION
         override fun updateSuggestions(suggestions: Bundleable?) = Unit
     }
 
     private fun createCarHost(owner: Any) = object : ICarHost.Stub() {
+        override fun getInterfaceVersion(): Int = ICarHost.VERSION
         private val appHost = createAppHost(owner)
 
         override fun getHost(type: String?): IBinder? = when (type) {
@@ -754,6 +780,7 @@ class CarAppConnection(private val context: Context) {
      */
     private fun call(name: String, onValue: (Any?) -> Unit, send: (IOnDoneCallback) -> Unit) {
         val callback = object : IOnDoneCallback.Stub() {
+            override fun getInterfaceVersion(): Int = IOnDoneCallback.VERSION
             override fun onSuccess(response: Bundleable?) {
                 val value = response?.let { runCatching { it.get() }.getOrNull() }
                 main.post { onValue(value) }
@@ -769,6 +796,7 @@ class CarAppConnection(private val context: Context) {
     }
 
     private fun noop(name: String) = object : IOnDoneCallback.Stub() {
+        override fun getInterfaceVersion(): Int = IOnDoneCallback.VERSION
         override fun onSuccess(response: Bundleable?) = Unit
         override fun onFailure(response: Bundleable?) = GearslipLog.w("host: $name failed")
     }
@@ -819,6 +847,7 @@ class CarAppConnection(private val context: Context) {
 
     private fun clearToasts() {
         CarToasts.clear(toastOwner)
+        app.seb3thehacker.gearslip.car.CarAlerts.clear(toastOwner)
         toastOwner = Any()
     }
 
@@ -833,6 +862,9 @@ class CarAppConnection(private val context: Context) {
         /** How long a new destination waits for the old route to end; see [navigateTo]. */
         const val REROUTE_WAIT_MS = 1_500L
 
+        /** How long an app gets to answer the first question before it counts as refusing. */
+        const val HANDSHAKE_TIMEOUT_MS = 10_000L
+
         /** Context.BIND_FOREGROUND_SERVICE; the constant itself is hidden from the SDK. */
         const val BIND_FOREGROUND_SERVICE = 0x04000000
     }

gearslip/src/main/java/app/seb3thehacker/gearslip/host/CarHardwareFeed.kt

@@ -0,0 +1,171 @@
+package app.seb3thehacker.gearslip.host
+
+import android.os.IBinder
+import androidx.car.app.hardware.ICarHardwareResult
+import androidx.car.app.hardware.common.CarUnit
+import androidx.car.app.hardware.common.CarValue
+import androidx.car.app.hardware.info.CarHardwareLocation
+import androidx.car.app.hardware.info.Compass
+import androidx.car.app.hardware.info.EnergyLevel
+import androidx.car.app.hardware.info.Mileage
+import androidx.car.app.hardware.info.Model
+import androidx.car.app.hardware.info.Speed
+import androidx.car.app.serialization.Bundleable
+import app.seb3thehacker.gearslip.GearslipLog
+import app.seb3thehacker.gearslip.car.CarData
+import app.seb3thehacker.gearslip.car.CarSettings
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.CopyOnWriteArrayList
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.launch
+
+/**
+ * What a car app gets when it asks the car hardware API (CarInfo, CarSensors) about the car:
+ * the model, speed, odometer, fuel and range, compass and the car's own GPS, read from [CarData].
+ * Anything else, or anything the car never sends, is answered "this car doesn't have that".
+ *
+ * A one-off question ([get]) is answered at once. A subscription gets the current value, if
+ * there is one, and then each new one as the car sends it, until the app unsubscribes or the
+ * connection ends ([stop]).
+ */
+internal class CarHardwareFeed(private val callback: (name: String) -> IBinder) {
+
+    private val subscribers = ConcurrentHashMap<Int, CopyOnWriteArrayList<ICarHardwareResult>>()
+    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+    @Volatile private var watching: Job? = null
+
+    fun get(type: Int, result: ICarHardwareResult?) {
+        val target = result ?: return
+        send(target, type, valueOf(type, CarData.state.value) ?: return unsupported(target, type))
+    }
+
+    fun subscribe(type: Int, result: ICarHardwareResult?) {
+        val target = result ?: return
+        if (type !in SENSOR_OF) return unsupported(target, type)
+        subscribers.getOrPut(type) { CopyOnWriteArrayList() }.add(target)
+        GearslipLog.i("host: an app subscribed to car hardware ${NAMES[type] ?: type}")
+        valueOf(type, CarData.state.value)?.let { send(target, type, it) }
+        watch()
+    }
+
+    fun unsubscribe(type: Int) {
+        subscribers.remove(type)
+    }
+
+    fun stop() {
+        subscribers.clear()
+        watching?.cancel()
+        watching = null
+    }
+
+    fun close() {
+        stop()
+        scope.cancel()
+    }
+
+    /** Sends each subscribed kind again when the car's reading of it changes. */
+    private fun watch() {
+        if (watching?.isActive == true) return
+        watching = scope.launch {
+            var seen = CarData.state.value.updatedAt
+            CarData.state.collect { s ->
+                for ((type, targets) in subscribers) {
+                    val sensor = SENSOR_OF[type] ?: continue
+                    if (s.updatedAt[sensor] == seen[sensor]) continue
+                    val value = valueOf(type, s) ?: continue
+                    targets.forEach { send(it, type, value) }
+                }
+                seen = s.updatedAt
+            }
+        }
+    }
+
+    private fun valueOf(type: Int, s: CarData.Snapshot): Any? {
+        val imperial = CarSettings.imperial()
+        val distanceUnit = known(if (imperial) CarUnit.MILE else CarUnit.KILOMETER)
+        val at = s.updatedAt[SENSOR_OF[type]] ?: System.currentTimeMillis()
+        fun <T : Any> v(value: T) = CarValue(value, at, CarValue.STATUS_SUCCESS)
+        return when (type) {
+            TYPE_MODEL -> CarData.model?.let { m ->
+                Model.Builder().setName(v(m.name)).apply { m.year?.let { setYear(v(it)) } }.build()
+            }
+            TYPE_SPEED -> s.speedMps?.let {
+                Speed.Builder()
+                    .setRawSpeedMetersPerSecond(v(it))
+                    .setDisplaySpeedMetersPerSecond(v(it))
+                    .setSpeedDisplayUnit(known(if (imperial) CarUnit.MILES_PER_HOUR else CarUnit.KILOMETERS_PER_HOUR))
+                    .build()
+            }
+            TYPE_MILEAGE -> s.odometerKm?.let {
+                Mileage.Builder().setOdometerMeters(v(it * 1000f)).setDistanceDisplayUnit(distanceUnit).build()
+            }
+            TYPE_ENERGY_LEVEL -> if (s.fuelPercent == null && s.rangeKm == null && s.fuelLow == null) null else {
+                EnergyLevel.Builder().apply {
+                    s.fuelPercent?.let { setFuelPercent(v(it.toFloat())) }
+                    s.rangeKm?.let { setRangeRemainingMeters(v(it * 1000f)) }
+                    s.fuelLow?.let { setEnergyIsLow(v(it)) }
+                    setDistanceDisplayUnit(distanceUnit)
+                }.build()
+            }
+            TYPE_COMPASS -> s.compassDegrees?.let { Compass(v(listOf(it))) }
+            TYPE_CAR_LOCATION -> s.location?.let { l ->
+                val location = android.location.Location("car").apply {
+                    latitude = l.latitude
+                    longitude = l.longitude
+                    l.accuracyMeters?.let { accuracy = it }
+                    l.altitudeMeters?.let { altitude = it }
+                    l.speedMps?.let { speed = it }
+                    l.bearingDegrees?.let { bearing = it }
+                    time = at
+                }
+                CarHardwareLocation(v(location))
+            }
+            else -> null
+        }
+    }
+
+    private fun known(value: Int) = CarValue(value, System.currentTimeMillis(), CarValue.STATUS_SUCCESS)
+
+    private fun send(target: ICarHardwareResult, type: Int, value: Any) {
+        runCatching {
+            target.onCarHardwareResult(type, true, Bundleable.create(value), callback("carHardwareResult"))
+        }.onFailure {
+            // The app went away: stop telling it.
+            subscribers.values.forEach { list -> list.remove(target) }
+            GearslipLog.w("host: could not send car hardware ${NAMES[type] ?: type}: ${it.javaClass.simpleName}")
+        }
+    }
+
+    private fun unsupported(target: ICarHardwareResult, type: Int) {
+        runCatching { target.onCarHardwareResult(type, false, null, callback("carHardwareResult")) }
+            .onFailure { GearslipLog.w("host: could not answer hardware result $type") }
+    }
+
+    companion object {
+        // ICarHardwareResultTypes in the car library.
+        private const val TYPE_MODEL = 1
+        private const val TYPE_ENERGY_LEVEL = 4
+        private const val TYPE_SPEED = 5
+        private const val TYPE_MILEAGE = 6
+        private const val TYPE_COMPASS = 21
+        private const val TYPE_CAR_LOCATION = 23
+
+        /** Which of the car's sensors each kind comes from, for knowing when it changed. */
+        private val SENSOR_OF = mapOf(
+            TYPE_ENERGY_LEVEL to CarData.FUEL,
+            TYPE_SPEED to CarData.SPEED,
+            TYPE_MILEAGE to CarData.ODOMETER,
+            TYPE_COMPASS to CarData.COMPASS,
+            TYPE_CAR_LOCATION to CarData.LOCATION,
+        )
+
+        private val NAMES = mapOf(
+            TYPE_MODEL to "model", TYPE_ENERGY_LEVEL to "energy level", TYPE_SPEED to "speed",
+            TYPE_MILEAGE to "mileage", TYPE_COMPASS to "compass", TYPE_CAR_LOCATION to "car location",
+        )
+    }
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/host/CarModels.kt

@@ -31,7 +31,41 @@ import kotlin.math.roundToInt
  */
 
 /** The app's text, preferring the longest variant that will fit; variants are ordered longest first. */
-fun CarText?.text(): String = this?.takeIf { !it.isEmpty }?.toCharSequence()?.toString().orEmpty()
+fun CarText?.text(): String {
+    val chars = this?.takeIf { !it.isEmpty }?.toCharSequence() ?: return ""
+    return chars.withSpansFilledIn()
+}
+
+/**
+ * Apps write a route's time and length as spans over placeholder characters ("\u0000 · \u0000"
+ * with a DurationSpan and a DistanceSpan), leaving the host to format them. Plain toString()
+ * keeps only the placeholders, which is how a route option ended up reading "·".
+ */
+private fun CharSequence.withSpansFilledIn(): String {
+    if (this !is android.text.Spanned) return toString()
+    val spans = getSpans(0, length, androidx.car.app.model.CarSpan::class.java)
+        .filter { it is androidx.car.app.model.DurationSpan || it is androidx.car.app.model.DistanceSpan }
+        .sortedBy { getSpanStart(it) }
+    if (spans.isEmpty()) return toString()
+    val out = StringBuilder()
+    var at = 0
+    spans.forEach { span ->
+        val start = getSpanStart(span)
+        val end = getSpanEnd(span)
+        if (start < at || end > length) return@forEach
+        out.append(this, at, start)
+        out.append(
+            when (span) {
+                is androidx.car.app.model.DurationSpan -> remainingTime(span.durationSeconds)
+                is androidx.car.app.model.DistanceSpan -> span.distance.display()
+                else -> ""
+            },
+        )
+        at = end
+    }
+    out.append(this, at, length)
+    return out.toString().replace("\u0000", "").trim()
+}
 
 /**
  * Icons keep coming back under fresh [CarIcon]/IconCompat objects - every template refetch
@@ -53,7 +87,7 @@ private val iconCache = android.util.LruCache<String, ImageBitmap>(200)
 fun CarIcon?.image(context: Context): ImageBitmap? {
     val icon = this?.icon ?: return null
     val key = icon.cacheKey(context)
-    iconCache.get(key)?.let { return it }
+    key?.let { k -> iconCache.get(k)?.let { return it } }
     val drawable: Drawable = runCatching { icon.loadDrawable(context) }
         .onFailure { GearslipLog.w("icon: loadDrawable threw for ${icon.describe()}: ${it.javaClass.simpleName}: ${it.message}") }
         .getOrNull()
@@ -73,7 +107,7 @@ fun CarIcon?.image(context: Context): ImageBitmap? {
     val bitmap = runCatching { drawable.toBitmap(width, height).asImageBitmap() }
         .onFailure { GearslipLog.w("icon: toBitmap threw for ${icon.describe()}: ${it.javaClass.simpleName}: ${it.message}") }
         .getOrNull() ?: return null
-    iconCache.put(key, bitmap)
+    key?.let { iconCache.put(it, bitmap) }
     return bitmap
 }
 
@@ -83,7 +117,15 @@ fun CarIcon?.image(context: Context): ImageBitmap? {
  * so a cache keyed on the bare id kept drawing the old build's picture on the wrong button (Vela's
  * new Saved button came up as its search glyph).
  */
-private fun androidx.core.graphics.drawable.IconCompat.cacheKey(context: Context): String {
+/**
+ * Null for an icon that carries its own pixels: two different bitmaps describe the same, so a
+ * key would hand one app's turn arrow the picture of whatever bitmap was cached first.
+ */
+private fun androidx.core.graphics.drawable.IconCompat.cacheKey(context: Context): String? {
+    if (type == androidx.core.graphics.drawable.IconCompat.TYPE_BITMAP ||
+        type == androidx.core.graphics.drawable.IconCompat.TYPE_ADAPTIVE_BITMAP ||
+        type == androidx.core.graphics.drawable.IconCompat.TYPE_DATA
+    ) return null
     if (type != androidx.core.graphics.drawable.IconCompat.TYPE_RESOURCE) return describe()
     val installed = runCatching { context.packageManager.getPackageInfo(resPackage, 0).lastUpdateTime }.getOrDefault(0L)
     return "${describe()}@$installed"
@@ -264,6 +306,20 @@ fun OnContentRefreshDelegate?.refresh() {
         .onFailure { GearslipLog.w("host: could not request a refresh: ${it.message}") }
 }
 
+/** An alert left the screen without the app taking it down: timed out, or closed by the driver. */
+fun androidx.car.app.model.AlertCallbackDelegate?.cancel(reason: Int) {
+    val delegate = this ?: return
+    runCatching { delegate.sendCancel(reason, doneCallback("an alert cancel")) }
+        .onFailure { GearslipLog.w("host: could not cancel an alert: ${it.message}") }
+}
+
+/** An alert left the screen another way: a newer one replaced it, the app took it down, or a tap. */
+fun androidx.car.app.model.AlertCallbackDelegate?.dismissed() {
+    val delegate = this ?: return
+    runCatching { delegate.sendDismiss(doneCallback("an alert dismiss")) }
+        .onFailure { GearslipLog.w("host: could not dismiss an alert: ${it.message}") }
+}
+
 private fun doneCallback(label: String) = object : OnDoneCallback {
     // onSuccess is annotated nullable and onFailure isn't - the asymmetry is real.
     override fun onSuccess(response: Bundleable?) = Unit