0.3.12-alpha: version and release notes

Opening AntennaPod while Metrolist played switched Gearslip's player to
AntennaPod, so the nav bar lost the music and its buttons drove the wrong app.
Leaving an app where nothing started goes back to the one that kept playing.

.github/release-notes.md

@@ -1,27 +1,20 @@
-Gearslip 0.3.02 connects wirelessly by itself, and phone calls work much better.
+Gearslip 0.3.12 gives the car screen a fresh look and fixes the wireless loop 0.3.02 caused on some head units.
 
 ## New
-- Wireless connects by itself. After your first wireless drive, Android asks once whether Gearslip may watch for that car. From then on, Gearslip connects whenever the car's Bluetooth does. A USB cable still wins.
-- Phone calls work much better. Calls you place from the car's dialer go through, and you can end or mute a call from the nav bar, which shows who you're talking to and for how long.
-- The browser goes full screen, for the whole page or a video in it.
-- The nav bar can hide while you navigate, or until you tap the screen.
-- Directions sit in short bars, so map apps keep their maps clear of them.
-- Share a log from an earlier launch, not just the current one.
-- In the car preview, you type with the phone's keyboard.
+- Navigation cards sit down the left side, with a bigger turn card that shows your lane. The map keeps the right side.
+- The car screen and the phone app take their colors from your phone's Material You palette.
+- The car's settings sit on the phone's home screen, each group on its own screen.
+- Put the home screen's player left or right of the map.
+- The browser shows the page title, and it has an address bar, forward, reload, and a start page.
+- If Gearslip lacks call permissions, the car's Phone screen asks for them on the phone.
 
 ## Changed
-- Help, Preview, and Logs sit in a row at the bottom of the phone's home screen.
-- What's new, at the top of Settings, opens the release notes here on GitHub.
+- Gearslip uses Car App Library 1.8. Map apps show the right turn arrows and route times, and Vela works fully.
+- Setup ends with recommended apps, then the button picker, then usage notes.
 
 ## Fixed
-- Before each spoken turn, Gearslip asks the car for its speakers, as Android Auto does. Some head units rebooted without this.
-- An app that won't run in Gearslip, such as Yandex Maps or 2GIS, now says so after 10 seconds instead of showing "Starting" forever.
-- Head units that take only AAC music get one start message, not two. A 2014 aftermarket unit dropped the connection over the second.
-- With music on Bluetooth, the car keeps its Bluetooth source.
-- Head units offering Android Auto 4.x and 6.x get a version they accept.
-- Homemade head units without a certificate keep working, and the wheel buttons and knob work as they do in the main build.
-- A car that reports the wrong screen size gets the right one.
-- iscle fixed how Gearslip frames, secures, and negotiates the connection, and how it checks what the car sends.
-
-## Known issues
-- Call audio plays through the car's Bluetooth phone connection, as it does with Android Auto. If a call plays on the phone instead, open the car in the phone's Bluetooth settings and turn on Phone calls.
+- Some head units, such as ZLink adapters, sent their Wi-Fi details twice. Gearslip rejoined the network each time and dropped the connection. It now ignores the repeat.
+- Gearslip no longer crashes when a wireless connection ends.
+- Opening a second music app without playing anything keeps the player on the song that's still playing.
+- Vela's speed sign is full size again.
+- RF Sentinel and other non-media car apps get their own tile in the launcher.

README.md

@@ -31,25 +31,27 @@ screen-sharing mode.
 |---|---|
 | ![The launcher, with every car app on the phone and the route in the bar below](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. A red X marks the ones that don't work yet. | 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 voice assistant listening over Organic Maps](docs/screenshots/assistant.png) | ![Coffee shops near you in Vela Maps, with the music player beside the map](docs/screenshots/places.png) |
-| Ask for a place, a song, or an app. | Find coffee nearby without leaving the map. |
+| ![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. |
+| ![The dashboard, with the weather, the week ahead, and recent notifications](docs/screenshots/dashboard.png) | ![DuckDuckGo open in Gearslip's web browser](docs/screenshots/web.png) |
+| The weather, your week, and what you missed. | 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 coffee nearby. 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
@@ -63,30 +65,35 @@ 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
+  too. USB 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

gearslip/build.gradle.kts

@@ -38,9 +38,9 @@ android {
         applicationId = "app.seb3thehacker.gearslip"
         minSdk = 31
         targetSdk = 37
-        versionCode = 11
+        versionCode = 12
         // -PgearslipVersionName=0.1.99-test makes a build that thinks it's older, to try the updater.
-        versionName = project.findProperty("gearslipVersionName")?.toString() ?: "0.3.02-alpha"
+        versionName = project.findProperty("gearslipVersionName")?.toString() ?: "0.3.12-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.
@@ -106,9 +106,10 @@ 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
@@ -118,7 +119,6 @@ tasks.register("renameApk") {
             .forEach { apk ->
                 val renamed = File(rootBuildDir, "Gearslip-${apk.parentFile.name}.apk")
                 apk.copyTo(renamed, overwrite = true)
-                apk.delete()
             }
     }
 }

gearslip/src/main/AndroidManifest.xml

@@ -162,6 +162,12 @@
           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.
         -->
+        <activity
+            android:name=".PermissionActivity"
+            android:exported="false"
+            android:excludeFromRecents="true"
+            android:theme="@style/Theme.Gearslip.Invisible" />
+
         <activity-alias
             android:name=".GearslipUsbAccessory"
             android:targetActivity=".GearslipActivity"

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
@@ -141,7 +140,6 @@ 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()

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

@@ -1089,11 +1089,17 @@ class GearslipRunner(
         }
 
         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 ->
@@ -1378,8 +1384,10 @@ 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
@@ -1394,7 +1402,66 @@ class GearslipRunner(
         }.apply { isDaemon = true }.start()
     }
 
+    /** 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
+        }
+    }
+
     private companion object {
+        /** The stats window adaptive bitrate reads, matching the watchdog's sleep. */
+        const val ADAPT_WINDOW_MS = 5_000L
+
         // protobuf/aap_protobuf/service/control/ControlMessageType.proto:7-17
         const val MSG_VERSION_REQUEST = 1
         const val MSG_VERSION_RESPONSE = 2

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/VideoSource.kt

@@ -42,6 +42,14 @@ 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 +59,8 @@ 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 +138,28 @@ 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() }

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

@@ -16,6 +16,7 @@ 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
@@ -38,6 +39,7 @@ 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
@@ -67,7 +69,7 @@ fun CarAppStage(
     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.
-        androidx.compose.runtime.CompositionLocalProvider(LocalChromeCover provides cover) {
+        androidx.compose.runtime.CompositionLocalProvider(LocalChromeCover provides cover, LocalCarAppConnection provides connection) {
             if (status.surfaceRequested) {
                 AppSurface(connection, frame, template, Modifier.fillMaxSize())
             }
@@ -102,10 +104,18 @@ private fun AppSurface(
     // 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) }
-    LaunchedEffect(template, size, measured) {
+    // 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 measuredStable = bounds?.takeIf { width > 0 && height > 0 }?.let { cover?.visibleWithin(it, width, height, skip = CoverEdge.START) }
+    LaunchedEffect(template, size, measured, measuredStable) {
         if (width > 0 && height > 0) {
             val visible = visibleAreaFor(template, width, height, measured)
-            connection.reportAreas(visible = visible, stable = visible)
+            val stable = if (!isContentTemplate(template)) {
+                visibleAreaFor(template, width, height, measuredStable)
+            } else {
+                visible
+            }
+            connection.reportAreas(visible = visible, stable = stable)
         }
     }
 
@@ -205,28 +215,31 @@ 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 ?: "Car app",
+                style = MaterialTheme.typography.titleSmall,
+                fontWeight = FontWeight.SemiBold,
+                modifier = Modifier.weight(1f),
+            )
+            GsIconButton(
+                androidx.compose.material.icons.Icons.Filled.Close,
+                "Close ${status.app ?: "the app"}",
+                onDisconnect,
+                size = 36.dp,
+                iconSize = 20.dp,
+                shape = androidx.compose.foundation.shape.CircleShape,
+            )
         }
     }
 }
@@ -236,3 +249,6 @@ 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/CarHomeScreen.kt

@@ -93,9 +93,14 @@ fun CarHome() {
         if (onHome) seenHome[0] = true
     }
     val splitScreen = phase == CarMedia.Phase.READY && now.isActive && panel != SidePanel.NONE
+    val playerLeft by CarSettings.playerLeft.collectAsStateWithLifecycle()
 
     // No padding anywhere, split screen or not: the player sits flush against the map.
     Row(Modifier.fillMaxSize()) {
+        val side = Modifier.weight(1f).fillMaxHeight().padding(bottom = LocalNavBarInset.current)
+        if (splitScreen && playerLeft) {
+            if (panel == SidePanel.LYRICS) SideLyrics(now, side) else DockedPlayer(now, side)
+        }
         Box(
             Modifier
                 .weight(if (splitScreen) 2.1f else 1f)
@@ -103,8 +108,7 @@ fun CarHome() {
         ) {
             MapPane(navStatus, frame)
         }
-        if (splitScreen) {
-            val side = Modifier.weight(1f).fillMaxHeight().padding(bottom = LocalNavBarInset.current)
+        if (splitScreen && !playerLeft) {
             if (panel == SidePanel.LYRICS) SideLyrics(now, side) else DockedPlayer(now, side)
         }
     }

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

@@ -119,35 +119,61 @@ 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]).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?,
+): 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))
     }
 }
 

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

@@ -0,0 +1,664 @@
+package app.seb3thehacker.gearslip.car
+
+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.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, "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
+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()
+
+    Surface(color = MaterialTheme.colorScheme.surfaceContainer) {
+        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.
+                val turn = rememberNextTurn().takeIf { 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) { 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 = "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,
+                )
+            }
+        }
+    }
+}
+
+/** 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 ?: "On a 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,
+                if (muted) "Unmute" else "Mute",
+                CarCalls::toggleMute,
+                tone = if (muted) GsTone.Primary else GsTone.Neutral, size = 36.dp, iconSize = 22.dp,
+            )
+            GsIconButton(
+                MediaIcons.CallEnd, "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. */
+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)
+    }
+}

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

@@ -60,6 +60,13 @@ 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 +137,8 @@ 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 +160,26 @@ 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. */

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

@@ -63,6 +63,7 @@ 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_THEME = "car_app_theme"
     private const val KEY_UI_THEME = "car_ui_theme"
     private const val KEY_PINNED = "car_pinned_apps"
@@ -70,6 +71,8 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     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_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"
@@ -100,6 +103,7 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     private val lastMediaFlow = MutableStateFlow<String?>(null)
     private val autoplayFlow = MutableStateFlow(false)
     private val playerTitleFlow = MutableStateFlow(false)
+    private val playerLeftFlow = MutableStateFlow(false)
     private val themeFlow = MutableStateFlow(AppTheme.PHONE)
     val appTheme: StateFlow<AppTheme> = themeFlow
     private val uiThemeFlow = MutableStateFlow(GsThemes.default.id)
@@ -111,6 +115,8 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
     private val experimentalFeaturesFlow = MutableStateFlow(false)
     private val systemSpeechFlow = MutableStateFlow(false)
     private val carSensorsFlow = MutableStateFlow(false)
+    private val adaptiveVideoFlow = MutableStateFlow(false)
+    private val debugBadgeFlow = MutableStateFlow(true)
     private val seenSafetyWarningFlow = MutableStateFlow(false)
     private val unitsFlow = MutableStateFlow(Units.AUTO)
 
@@ -215,6 +221,9 @@ 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
+
     val scale: StateFlow<Float> = scaleFlow
     val openOnConnect: StateFlow<String> = openFlow
     val nightMode: StateFlow<NightMode> = nightFlow
@@ -267,6 +276,20 @@ 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
+
+    /** 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 -
@@ -292,6 +315,7 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         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"
         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.
@@ -308,6 +332,8 @@ private const val KEY_LOCATION_WARNING = "car_location_warning"
         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"
+        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))
@@ -362,6 +388,11 @@ 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 setAutoplay(on: Boolean) {
         autoplayFlow.value = on
         AppSettings.putString(app, KEY_AUTOPLAY, on.toString())
@@ -405,6 +436,11 @@ 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 setCarSensorsEnabled(on: Boolean) {
         carSensorsFlow.value = on
         AppSettings.putString(app, KEY_CAR_SENSORS, on.toString())

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

@@ -13,6 +13,7 @@ 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
@@ -63,10 +64,12 @@ fun CarSettingsScreen() {
     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 theme by CarSettings.appTheme.collectAsState()
     val uiTheme by CarSettings.uiTheme.collectAsState()
     val experimentalFeatures by CarSettings.experimentalFeaturesEnabled.collectAsState()
     val carSensors by CarSettings.carSensorsEnabled.collectAsState()
+    val adaptiveVideo by CarSettings.adaptiveVideoEnabled.collectAsState()
     val systemSpeech by CarSettings.systemSpeech.collectAsState()
     val display by CarEnvironment.display.collectAsState()
     val vehicle by CarEnvironment.vehicle.collectAsState()
@@ -86,6 +89,8 @@ fun CarSettingsScreen() {
             ScreenHeader("Settings")
         }
 
+        item { Group("Screen") }
+
         item {
             ChoiceRow(
                 "Open on connect",
@@ -152,6 +157,8 @@ fun CarSettingsScreen() {
             ) { CarSettings.setScreenFit(it) }
         }
 
+        item { Group("Nav bar and player") }
+
         item {
             ChoiceRow(
                 "Nav bar",
@@ -172,6 +179,14 @@ fun CarSettingsScreen() {
             ) { CarSettings.setPlayerTitle(it) }
         }
 
+        item {
+            ChoiceRow(
+                "Player beside the map",
+                listOf(false to "Right", true to "Left"),
+                playerLeft,
+            ) { CarSettings.setPlayerLeft(it) }
+        }
+
         item {
             ChoiceRow(
                 "Autoplay on connect",
@@ -180,6 +195,8 @@ fun CarSettingsScreen() {
             ) { CarSettings.setAutoplay(it) }
         }
 
+        item { Group("Sound and voice") }
+
         item {
             ChoiceRow(
                 "Car audio",
@@ -198,6 +215,8 @@ fun CarSettingsScreen() {
             )
         }
 
+        item { Group("Warnings") }
+
         if (!pipeAudio) item {
             ChoiceRow(
                 "Warn when Bluetooth isn't connected",
@@ -241,6 +260,8 @@ fun CarSettingsScreen() {
             ) { CarSettings.setSystemSpeech(it) }
         }
 
+        item { Group("More") }
+
         item {
             WebPageSetting()
         }
@@ -258,7 +279,7 @@ fun CarSettingsScreen() {
         }
 
         if (experimentalFeatures) item {
-            ExperimentalFeaturesList(carSensors)
+            ExperimentalFeaturesList(carSensors, adaptiveVideo)
         }
 
         item {
@@ -291,8 +312,37 @@ 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)
+            }
+        }
+    }
+}
+
+/** 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
@@ -319,7 +369,7 @@ 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) {
     Column(
         Modifier.fillMaxWidth(),
         verticalArrangement = Arrangement.spacedBy(10.dp),
@@ -332,6 +382,12 @@ private fun ExperimentalFeaturesList(carSensors: Boolean) {
                 "guess, not a fact, until you've watched one change for yourself.",
             checked = carSensors,
         ) { CarSettings.setCarSensorsEnabled(it) }
+        ExperimentalFeatureRow(
+            title = "Adaptive video quality",
+            description = "Lowers the picture's quality when the car, or its Wi-Fi, can't keep " +
+                "up, and raises it again once it can. Takes effect on the next connection.",
+            checked = adaptiveVideo,
+        ) { CarSettings.setAdaptiveVideoEnabled(it) }
     }
 }
 

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

@@ -75,6 +75,7 @@ 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
@@ -117,7 +118,7 @@ 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)
     val base = LocalDensity.current
     val insets by CarEnvironment.insets.collectAsState()
     val navigator = remember { CarNavigator(CarSettings.openOnConnect.value) }
@@ -316,7 +317,8 @@ fun CarUi() {
                         VoiceHelpOverlay(Modifier.align(Alignment.Center))
                         CallOverlay()
                         AssistantOverlay(Modifier.align(Alignment.BottomCenter).padding(bottom = homeInset))
-                        if (app.seb3thehacker.gearslip.BuildConfig.DEBUG) {
+                        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
@@ -357,7 +359,7 @@ fun CarUi() {
     }
 }
 
-private val NAV_BAR_HEIGHT = 56.dp
+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,
@@ -479,568 +481,6 @@ 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(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.
-                val turn = rememberNextTurn().takeIf { 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) { 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 = "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,
-                )
-            }
-        }
-    }
-}
-
-/** 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 ?: "On a 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,
-                if (muted) "Unmute" else "Mute",
-                CarCalls::toggleMute,
-                tone = if (muted) GsTone.Primary else GsTone.Neutral, size = 36.dp, iconSize = 22.dp,
-            )
-            GsIconButton(
-                MediaIcons.CallEnd, "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. */
-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/MediaBrowse.kt

@@ -0,0 +1,232 @@
+package app.seb3thehacker.gearslip.car
+
+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.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(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(
+                "$appLabel keeps its library to itself.",
+                "Start music in the app on your phone. Play, pause, skip and seek work from here.",
+            )
+            browse.failed -> Notice("Could not load this list.", null)
+            browse.entries.isEmpty() -> Notice("Nothing here.", null)
+            else -> LazyColumn(Modifier.fillMaxSize(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                items(browse.entries, key = { it.id }) { entry -> EntryRow(entry, media) }
+            }
+        }
+    }
+}
+
+// --- up next -----------------------------------------------------------------------------------
+
+/**
+ * Whatever the app has queued up, starting right after the track that's playing now - not the
+ * whole queue from the top, which would just repeat what the player beside it already shows. Apps
+ * that never publish a queue (many don't) show an empty notice rather than a permanently blank tab.
+ */
+@Composable
+internal fun QueuePanel(queue: List<QueueTrack>, now: NowPlaying, media: CarMedia, modifier: Modifier) {
+    val upNext = remember(queue, now.activeQueueItemId) {
+        val current = queue.indexOfFirst { it.queueId == now.activeQueueItemId }
+        if (current >= 0) queue.drop(current + 1) else queue
+    }
+    Column(modifier) {
+        if (upNext.isEmpty()) {
+            Notice(
+                "Nothing queued.",
+                "${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) {
+            RowArt(icon, MediaIcons.MusicNote)
+            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
+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.surfaceVariant,
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Row(Modifier.padding(10.dp), verticalAlignment = Alignment.CenterVertically) {
+            RowArt(icon, if (entry.browsable) MediaIcons.Folder else MediaIcons.MusicNote)
+            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)
+        }
+    }
+}
+
+/** 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(62.dp).clip(MaterialTheme.shapes.medium).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 with a filled right-hand panel: "put the player beside the map". */
+    val DockRight = icon("DockRight", "M2,4h20v16H2zM4,6h10v12H4z", 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

@@ -93,6 +93,7 @@ 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)
 
@@ -444,7 +445,7 @@ 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,
@@ -491,7 +492,14 @@ private fun CoverArt(art: android.graphics.Bitmap?, modifier: Modifier) {
             shadowElevation = 6.dp,
             modifier = Modifier.size(minOf(maxWidth, maxHeight)),
         ) {
-            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))
+                }
+            }
         }
     }
 }
@@ -518,6 +526,12 @@ private fun NowPlayingControls(now: NowPlaying, media: CarMedia, modifier: Modif
                 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(
+                    "Press play to pick up where you left off, or find something in Browse.",
+                    style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
         }
         PlayerProgress(now, media, Modifier.fillMaxWidth())
         TransportRow(now, media, skip = 60.dp, modifier = Modifier.fillMaxWidth())
@@ -555,147 +569,3 @@ private fun CompactPlayer(now: NowPlaying, media: CarMedia, modifier: Modifier)
 
 // --- 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)
-    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/PhoneDialerScreen.kt

@@ -133,7 +133,7 @@ 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)) {
@@ -148,7 +148,7 @@ fun PhoneDialerScreen() {
         }
 
         if (!hasPermissions) {
-            MissingPermission(context)
+            MissingPermission(context) { hasPermissions = true }
             return@Column
         }
 
@@ -159,19 +159,23 @@ fun PhoneDialerScreen() {
 }
 
 @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.",
+            "Gearslip needs the Phone and Contacts permissions to dial from here. Allow them on " +
+                "the phone when you're parked.",
             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("Ask on the phone") }
     }
 }
 

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

@@ -103,13 +103,13 @@ fun visibleAreaFor(template: Template?, width: Int, height: Int, measured: Rect?
     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, measured?.bottom ?: height)
+    -> measured ?: 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, END }
+internal enum class CoverEdge { TOP, BOTTOM, START, END }
 
 /**
  * Where the chrome over the map actually landed, in window pixels. The map buttons count even
@@ -129,15 +129,17 @@ internal class ChromeCover {
     }
 
     /** What is left of a [width] x [height] surface at [surface] (window pixels), in surface pixels. */
-    fun visibleWithin(surface: ComposeRect, width: Int, height: Int): Rect {
+    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)
             }
         }
@@ -171,7 +173,8 @@ internal fun Modifier.covers(key: String, edge: CoverEdge): Modifier {
 
 @Composable
 private fun NavigationChrome(template: NavigationTemplate, modifier: Modifier) {
-    val pan by CarServices.nav.panMode.collectAsState()
+    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 }
@@ -179,10 +182,10 @@ private fun NavigationChrome(template: NavigationTemplate, modifier: Modifier) {
 }
 
 /**
- * The turn in one short bar across the top, the arrival time in another along the bottom, so the
- * map keeps its full width. Neither grows past [NAV_BAR_MAX_WIDTH]. The bottom one is short and
- * left out of the visible area on purpose, so a speedometer in the app's bottom corner sits level
- * with it rather than stacked above it. The map buttons sit between them on the right.
+ * 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(
@@ -191,85 +194,104 @@ private fun NavigationBars(
     estimate: TravelEstimate?,
     modifier: Modifier,
 ) {
-    val pan by CarServices.nav.panMode.collectAsState()
-    Column(modifier.fillMaxSize()) {
-        routing?.let {
-            RoutingBar(
-                it,
-                Modifier.covers("nav-top", CoverEdge.TOP).padding(start = 12.dp, top = 12.dp, end = 12.dp)
-                    .widthIn(max = NAV_BAR_MAX_WIDTH).fillMaxWidth(),
-            )
-        }
-        Row(Modifier.weight(1f).fillMaxWidth()) {
-            Box(Modifier.weight(1f).fillMaxHeight()) {
-                estimate?.let {
-                    TravelEstimateBar(
-                        it,
-                        Modifier.align(Alignment.BottomStart).padding(12.dp)
-                            .widthIn(max = NAV_BAR_MAX_WIDTH),
-                    )
+    val connection = LocalCarAppConnection.current
+    val pan by connection.panMode.collectAsState()
+    androidx.compose.foundation.layout.BoxWithConstraints(modifier.fillMaxSize()) {
+        val column = cardColumnWidth(maxWidth)
+        Row(Modifier.fillMaxSize()) {
+            if (routing != null || estimate != null) {
+                Column(
+                    Modifier.width(column).fillMaxHeight().covers("nav-cards", CoverEdge.START).padding(12.dp),
+                    verticalArrangement = Arrangement.spacedBy(12.dp),
+                ) {
+                    routing?.let { RoutingCard(it, Modifier.fillMaxWidth()) }
+                    Spacer(Modifier.weight(1f))
+                    estimate?.let { TravelEstimateCard(it, Modifier.fillMaxWidth()) }
                 }
             }
+            Spacer(Modifier.weight(1f))
             RightEdgeControls(
                 if (pan) null else template.actionStrip,
                 template.mapActionStrip,
                 Modifier.padding(12.dp),
-                // Only the column: the app's own buttons are a wide row up top, over the map's
-                // edge rather than where a speedometer or the like would go.
                 mapActionsModifier = Modifier.covers("nav-buttons", CoverEdge.END),
             )
         }
     }
 }
 
-/** The manoeuvre in one row: arrow, distance, what to do, onto what road, and lanes or the next turn. */
+/**
+ * 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 RoutingBar(info: RoutingInfo, modifier: Modifier = Modifier) {
+private fun RoutingCard(info: RoutingInfo, modifier: Modifier = Modifier) {
     if (info.isLoading) {
         ChromeSurface(modifier) {
-            Text("Finding a route…", Modifier.padding(horizontal = 16.dp, vertical = 12.dp), style = ChromeType.title)
+            Text("Finding a 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(horizontal = 14.dp, vertical = 10.dp)) {
-            Row(verticalAlignment = Alignment.CenterVertically) {
-                CarGlyph(step.maneuver?.icon, Modifier.size(40.dp))
-                Spacer(Modifier.width(12.dp))
-                val distance = info.currentDistance.display()
-                if (distance.isNotEmpty()) {
-                    Text(distance, style = ChromeType.headline, maxLines = 1)
-                    Spacer(Modifier.width(14.dp))
-                }
-                Column(Modifier.weight(1f)) {
-                    Text(step.cue.text(), style = ChromeType.title, maxLines = 1, overflow = TextOverflow.Ellipsis)
+        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,
+                            )
+                        }
+                    }
+                    val cue = step.cue.text()
+                    if (cue.isNotEmpty()) {
+                        Text(cue, style = ChromeType.title, maxLines = 2, overflow = TextOverflow.Ellipsis)
+                    }
                     val road = step.road.text()
-                    if (road.isNotEmpty()) {
+                    // "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 = MaterialTheme.colorScheme.onSurfaceVariant,
+                            color = scheme.onPrimaryContainer.copy(alpha = 0.8f),
                             maxLines = 1,
                             overflow = TextOverflow.Ellipsis,
                         )
                     }
-                }
-                val next = info.nextStep
-                if (step.lanesImage != null || step.lanes.orEmpty().isNotEmpty()) {
-                    LaneGuidance(step, Modifier.padding(start = 12.dp).widthIn(max = 200.dp).heightIn(max = 48.dp))
-                } else if (next != null) {
-                    Spacer(Modifier.width(12.dp))
-                    Text("then", style = ChromeType.label, color = MaterialTheme.colorScheme.onSurfaceVariant)
-                    Spacer(Modifier.width(8.dp))
-                    CarGlyph(next.maneuver?.icon, Modifier.size(24.dp))
+                    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) }
                 }
             }
-            // Rare, and only where an arrow can't explain the junction: worth the bar growing for.
-            info.junctionImage?.let { junction ->
-                Spacer(Modifier.height(8.dp))
-                JunctionImage(junction)
+            info.nextStep?.let { next ->
+                Row(
+                    Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 10.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                ) {
+                    Text("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)
+                    }
+                }
             }
         }
     }
@@ -345,68 +367,59 @@ 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. One short line along the bottom,
- * stopping short of the map buttons. 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 bar 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,
         ) {
+            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 { "Arrive $it" },
+                    distance.takeIf { it.isNotEmpty() },
+                ).joinToString("  •  ")
+                if (detail.isNotEmpty()) {
+                    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 (so a
-            // freshly picked destination silently does nothing); this is the call that actually
-            // clears that flag on the app's side.
+            // pops the on-screen card, leaving the app still believing it is navigating.
             GsIconButton(
                 Icons.Filled.Close,
                 "Stop navigating",
-                { CarServices.nav.stopNavigating() },
+                { connection.stopNavigating() },
                 colors = GsColors(MaterialTheme.colorScheme.surfaceContainerHighest, MaterialTheme.colorScheme.onSurface),
-                size = 40.dp,
-                iconSize = 20.dp,
+                size = 52.dp,
+                iconSize = 26.dp,
                 shape = CircleShape,
             )
-            Spacer(Modifier.width(10.dp))
-            if (time.isNotEmpty()) {
-                Text(
-                    time,
-                    style = ChromeType.headline,
-                    color = estimate.remainingTimeColor.color(dark, MaterialTheme.colorScheme.onSurface),
-                    maxLines = 1,
-                )
-            }
-            if (detail.isNotEmpty()) {
-                Spacer(Modifier.width(16.dp))
-                Text(
-                    detail,
-                    style = ChromeType.body,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                    maxLines = 1,
-                    overflow = TextOverflow.Ellipsis,
-                )
-            }
         }
     }
 }
@@ -428,16 +441,18 @@ 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()
     androidx.compose.foundation.layout.BoxWithConstraints(modifier.fillMaxWidth()) {
         if (!pan) {
             ChromeSurface(
                 Modifier
                     .align(Alignment.TopStart)
+                    .covers("map-pane", CoverEdge.START)
                     .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,
@@ -558,12 +573,16 @@ private fun ListPane(
     }
 }
 
-/** Fraction of the surface the content pane covers beside a map. */
-private const val CONTENT_PANE_FRACTION = 0.42f
 
 
-/** Past this the bars only spread the same words further apart, across a map left with no music beside it. */
-private val NAV_BAR_MAX_WIDTH = 460.dp
+/**
+ * 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

@@ -517,7 +517,8 @@ 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

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

@@ -106,7 +106,8 @@ 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,
@@ -217,6 +218,9 @@ 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?,
@@ -225,22 +229,23 @@ internal fun RightEdgeControls(
     /** For the stack of map buttons alone, without the row of the app's own above it. */
     mapActionsModifier: Modifier = Modifier,
 ) {
+    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
     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",
     )
@@ -288,7 +293,7 @@ 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()
 
@@ -298,13 +303,14 @@ 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
@@ -319,8 +325,8 @@ 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,
@@ -431,8 +437,9 @@ 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 {
@@ -507,315 +514,6 @@ 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 +1,391 @@
+package app.seb3thehacker.gearslip.car
+
+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("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/WebApp.kt

@@ -31,6 +31,10 @@ 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.
@@ -56,6 +60,11 @@ fun WebApp(content: String) {
     // 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() } }
@@ -86,7 +95,18 @@ fun WebApp(content: String) {
     Column(Modifier.fillMaxSize()) {
         // Back steps through the page's history first (the interceptor above), then leaves.
         if (!fullscreen) {
-            ScreenHeader("Browser", Modifier.padding(horizontal = 16.dp, vertical = 8.dp)) {
+            ScreenHeader(pageTitle.ifEmpty { "Browser" }, Modifier.padding(horizontal = 16.dp, vertical = 8.dp)) {
+                GsIconButton(androidx.compose.material.icons.Icons.Filled.Search, "Search or type an address", {
+                    fieldText = null
+                    address = ""
+                })
+                if (canGoForward) {
+                    GsIconButton(androidx.compose.material.icons.Icons.AutoMirrored.Filled.ArrowForward, "Forward", { web?.goForward() })
+                }
+                GsIconButton(androidx.compose.material.icons.Icons.Filled.Refresh, "Reload", { web?.reload() })
+                GsIconButton(androidx.compose.material.icons.Icons.Filled.Home, "Start page", {
+                    web?.let { view -> loadContent(view, content) }
+                })
                 GsIconButton(MediaIcons.Fullscreen, "Full screen", CarFullscreen::enter)
             }
         }
@@ -99,8 +119,15 @@ fun WebApp(content: String) {
                     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
@@ -117,11 +144,7 @@ fun WebApp(content: String) {
                         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
                 }
             },
@@ -145,6 +168,17 @@ fun WebApp(content: String) {
             }
         }
         }
+        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,
@@ -162,9 +196,29 @@ 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 +1,29 @@
+package app.seb3thehacker.gearslip.car.theme
+
+import androidx.compose.material3.ColorScheme
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.compositeOver
+
+/**
+ * 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): ColorScheme {
+    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),
+    )
+}

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

@@ -403,6 +403,8 @@ 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) {
@@ -626,6 +628,7 @@ 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() }
@@ -664,6 +667,7 @@ 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
@@ -691,6 +695,7 @@ class CarAppConnection(private val context: Context) {
      * IBinder must be a real IOnDoneCallback - the app dispatches the reply through it.
      */
     private val hardwareHost = object : ICarHardwareHost.Stub() {
+        override fun getInterfaceVersion(): Int = ICarHardwareHost.VERSION
         override fun getCarHardwareResult(
             type: Int,
             params: Bundleable?,
@@ -721,6 +726,7 @@ 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
@@ -739,10 +745,12 @@ 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) {
@@ -775,6 +783,7 @@ 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) }
@@ -790,6 +799,7 @@ 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")
     }

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"

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

@@ -24,6 +24,7 @@ object KnownApps {
         "nl.flitsmeister", // Flitsmeister: map, routing, alerts - works well
         "com.mapquest.android.ace", // MapQuest: map, routing, navigation
         "com.mapswithme.maps.pro", // MAPS.ME: map, search, place pages, navigation
+        "app.vela", // Vela Maps: map, search, route options, turn-by-turn with lanes
     )
 
     fun works(packageName: String): Boolean = packageName in working
@@ -99,7 +100,6 @@ object KnownApps {
      * call working. Wins over [works] and [playerWorks] for the badge.
      */
     private val partial = setOf(
-        "app.vela", // Vela Maps: connects and draws, but rough enough not to call it working yet
         "com.spotify.music",        // Spotify: plays through Gearslip's player, but the app has to be opened on the phone first
         "deezer.android.app",       // Deezer: the same - it has to be opened on the phone first
     )

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/GearslipApp.kt

@@ -37,7 +37,7 @@ import app.seb3thehacker.gearslip.BuildConfig
 import app.seb3thehacker.gearslip.CertProvider
 import app.seb3thehacker.gearslip.stats.UsageStats
 
-private enum class Screen { INTRO, HOME, LOGS, SETTINGS, CAR_PREVIEW, CERT_SETUP, SETUP_GUIDE, USAGE_NOTES, HELP, WHATS_NEW, RECOMMENDED_APPS }
+private enum class Screen { HOME, LOGS, SETTINGS, CAR_PREVIEW, CERT_SETUP, SETUP_GUIDE, USAGE_NOTES, HELP, WHATS_NEW, RECOMMENDED_APPS, CAR_GROUP }
 
 /** Three screens and a back stack of depth one: no navigation library needed. */
 @Composable
@@ -47,8 +47,8 @@ fun GearslipApp(onDisconnect: () -> Unit, onRequestCallScreening: () -> Unit) {
         !AppSettings.hasSkippedCertSetup(context) && !CertProvider.hasAnyCert(context)
     }
     val needsSetupGuide = remember { !AppSettings.hasSeenPermissionsSetup(context) }
-    // Where launch goes once the intro (if any) is done.
-    val afterIntro = remember {
+    // Where launch goes: setup until it's done, then Home.
+    val start = remember {
         when {
             needsCertSetup -> Screen.CERT_SETUP
             needsSetupGuide -> Screen.SETUP_GUIDE
@@ -57,14 +57,14 @@ fun GearslipApp(onDisconnect: () -> Unit, onRequestCallScreening: () -> Unit) {
             else -> Screen.HOME
         }
     }
-    var screen by rememberSaveable { mutableStateOf(if (Intro.due(context)) Screen.INTRO else afterIntro) }
-    // A replay from About goes back to Settings; the launch one carries on into setup.
-    var introReturn by rememberSaveable { mutableStateOf(afterIntro) }
+    var screen by rememberSaveable { mutableStateOf(start) }
     // Home's "it worked" card opens Settings at usage notes rather than at the top.
     var settingsAtUsageNotes by rememberSaveable { mutableStateOf(false) }
     // What's new and Connection help open from Home and from Settings; back returns to whichever.
     var backTo by rememberSaveable { mutableStateOf(Screen.SETTINGS) }
-    BackHandler(enabled = screen != Screen.HOME && screen != Screen.INTRO) {
+    // Which of the car's setting groups Home opened.
+    var carGroup by rememberSaveable { mutableStateOf(CarGroup.SCREEN) }
+    BackHandler(enabled = screen != Screen.HOME) {
         screen = when (screen) {
             Screen.RECOMMENDED_APPS, Screen.LOGS, Screen.CAR_PREVIEW -> Screen.SETTINGS
             Screen.HELP, Screen.WHATS_NEW -> backTo
@@ -101,11 +101,10 @@ fun GearslipApp(onDisconnect: () -> Unit, onRequestCallScreening: () -> Unit) {
             .windowInsetsPadding(WindowInsets.statusBars)
             .consumeWindowInsets(WindowInsets.statusBars),
     ) {
-        if (BuildConfig.DEBUG && screen != Screen.CAR_PREVIEW && screen != Screen.INTRO) DebugBuildBanner()
+        if (BuildConfig.DEBUG && screen != Screen.CAR_PREVIEW) DebugBuildBanner()
 
         Column(Modifier.weight(1f)) {
             when (screen) {
-                Screen.INTRO -> IntroScreen(onDone = { screen = introReturn })
                 Screen.HOME -> HomeScreen(
                     onOpenSettings = { settingsAtUsageNotes = false; screen = Screen.SETTINGS },
                     onOpenHelp = { backTo = Screen.HOME; screen = Screen.HELP },
@@ -113,7 +112,9 @@ fun GearslipApp(onDisconnect: () -> Unit, onRequestCallScreening: () -> Unit) {
                     onOpenCarPreview = { backTo = Screen.HOME; screen = Screen.CAR_PREVIEW },
                     onOpenLogs = { backTo = Screen.HOME; screen = Screen.LOGS },
                     onDisconnect = onDisconnect,
+                    onOpenCarGroup = { carGroup = it; screen = Screen.CAR_GROUP },
                 )
+                Screen.CAR_GROUP -> CarGroupScreen(carGroup, onBack = { screen = Screen.HOME })
                 Screen.WHATS_NEW -> WhatsNewScreen(onBack = { screen = backTo })
                 Screen.LOGS -> LogsScreen(onBack = { screen = backTo })
                 Screen.SETTINGS -> SettingsScreen(

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/GearslipTheme.kt

@@ -6,11 +6,16 @@ import androidx.compose.material3.dynamicDarkColorScheme
 import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.platform.LocalContext
+import app.seb3thehacker.gearslip.car.theme.withTintedSurfaces
 
-/** Material You: the palette comes from the wallpaper (minSdk 35, so dynamic color always exists). */
+/**
+ * Material You: the palette comes from the wallpaper (minSdk 35, so dynamic color always exists),
+ * with the same accent tint over the surfaces as the car screen, so the two look like one app.
+ */
 @Composable
 fun GearslipTheme(content: @Composable () -> Unit) {
     val context = LocalContext.current
-    val scheme = if (isSystemInDarkTheme()) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+    val dark = isSystemInDarkTheme()
+    val scheme = (if (dark) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)).withTintedSurfaces(dark)
     MaterialTheme(colorScheme = scheme, content = content)
 }

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/GuideParts.kt

@@ -0,0 +1,335 @@
+package app.seb3thehacker.gearslip.ui
+
+import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.core.CubicBezierEasing
+import androidx.compose.animation.core.FastOutSlowInEasing
+import androidx.compose.animation.core.LinearEasing
+import androidx.compose.animation.core.RepeatMode
+import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.animation.core.animateFloat
+import androidx.compose.animation.core.infiniteRepeatable
+import androidx.compose.animation.core.keyframes
+import androidx.compose.animation.core.rememberInfiniteTransition
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.Canvas
+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.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.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+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.geometry.CornerRadius
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.Path
+import androidx.compose.ui.graphics.StrokeCap
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.graphics.drawscope.rotate
+import androidx.compose.ui.graphics.drawscope.scale
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.TextUnit
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.runtime.CompositionLocalProvider
+import app.seb3thehacker.gearslip.car.CarSettings
+import app.seb3thehacker.gearslip.car.theme.GsButton
+import app.seb3thehacker.gearslip.car.theme.GsIconButton
+import app.seb3thehacker.gearslip.car.theme.GsThemes
+import app.seb3thehacker.gearslip.car.theme.GsTone
+import app.seb3thehacker.gearslip.car.theme.LocalGsTheme
+import kotlin.math.PI
+import kotlin.math.cos
+import kotlin.math.atan2
+import kotlin.math.sqrt
+import kotlin.math.sin
+import kotlinx.coroutines.delay
+
+/**
+ * The setup guide's tones, taken from the phone's own Material You colours like the rest of the app.
+ * Every size is taken from the screen's width, so the guide scales from small phones to tablets.
+ */
+internal class IntroColors(
+    val surface: Color, val onSurface: Color, val onVariant: Color, val outline: Color,
+    val primary: Color, val onPrimary: Color, val primaryC: Color, val onPrimaryC: Color,
+    val tertiaryC: Color, val onTertiaryC: Color, val secondaryC: Color, val onSecondaryC: Color,
+)
+
+@Composable
+internal fun introColors(): IntroColors {
+    val m = MaterialTheme.colorScheme
+    return IntroColors(
+        surface = m.surface, onSurface = m.onSurface, onVariant = m.onSurfaceVariant, outline = m.outline,
+        primary = m.primary, onPrimary = m.onPrimary, primaryC = m.primaryContainer, onPrimaryC = m.onPrimaryContainer,
+        tertiaryC = m.tertiaryContainer, onTertiaryC = m.onTertiaryContainer,
+        secondaryC = m.secondaryContainer, onSecondaryC = m.onSecondaryContainer,
+    )
+}
+
+private val Pop = CubicBezierEasing(0.3f, 1.6f, 0.5f, 1f)
+private val Rise = CubicBezierEasing(0.2f, 0.8f, 0.2f, 1f)
+
+/** 0 to 1 once each time [key] changes, after [delayMs]: drives the entrance of one element. */
+@Composable
+internal fun entrance(key: Any, delayMs: Int, durationMs: Int = 650): Float {
+    val a = remember(key) { Animatable(0f) }
+    LaunchedEffect(key) {
+        delay(delayMs.toLong())
+        a.animateTo(1f, tween(durationMs, easing = LinearEasing))
+    }
+    return a.value
+}
+
+/** Slides up and fades in, like the mockup's `up`. */
+internal fun Modifier.up(p: Float, distance: Dp) = graphicsLayer {
+    val e = Rise.transform(p)
+    alpha = e
+    translationY = (1 - e) * distance.toPx()
+}
+
+/** Grows in with a bounce, like the mockup's `bounce`. */
+internal fun Modifier.pop(p: Float) = graphicsLayer {
+    val e = Pop.transform(p)
+    alpha = p.coerceAtMost(1f)
+    scaleX = 0.5f + 0.5f * e
+    scaleY = 0.5f + 0.5f * e
+}
+
+/**
+ * The car's button styles side by side, each drawn in its own style, and a row of real car
+ * controls below that redraws in whichever is picked. Picking saves it, so the car shows it too.
+ */
+@Composable
+internal fun ThemePicker(c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, key: Any) {
+    val chosenId by CarSettings.uiTheme.collectAsState()
+    val chosen = GsThemes.byId(chosenId)
+    // Flat first: it's the default.
+    val themes = listOf(GsThemes.Flat) + GsThemes.builtIn.filter { it != GsThemes.Flat }
+    Column(
+        Modifier.padding(top = cq(7f)).fillMaxWidth().up(entrance(key, 500, 700), cq(7f)),
+        verticalArrangement = Arrangement.spacedBy(cq(6f)),
+    ) {
+        Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(cq(3f))) {
+            themes.forEach { theme ->
+                CompositionLocalProvider(LocalGsTheme provides theme) {
+                    GsButton(
+                        onClick = { CarSettings.setUiTheme(theme.id) },
+                        modifier = Modifier.weight(1f),
+                        tone = if (theme == chosen) GsTone.Primary else GsTone.Neutral,
+                        contentPadding = PaddingValues(horizontal = cq(1f), vertical = cq(3f)),
+                    ) {
+                        Text(
+                            if (theme == chosen) "✓ ${theme.name}" else theme.name,
+                            style = TextStyle(fontSize = cqSp(4.2f), fontWeight = FontWeight.Bold),
+                            maxLines = 1,
+                        )
+                    }
+                }
+            }
+        }
+        // What the car shows: the player's controls and a full-width action.
+        CompositionLocalProvider(LocalGsTheme provides chosen) {
+            Row(
+                Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.spacedBy(cq(3f)),
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
+                GsIconButton(Icons.Filled.Search, "Search", onClick = {}, size = cq(15f), iconSize = cq(7f))
+                GsIconButton(Icons.Filled.PlayArrow, "Play", onClick = {}, tone = GsTone.Primary, size = cq(15f), iconSize = cq(8f))
+                GsButton(
+                    onClick = {},
+                    modifier = Modifier.weight(1f).height(cq(15f)),
+                    tone = GsTone.Tonal,
+                ) { Text("Navigate", style = TextStyle(fontSize = cqSp(4.6f), fontWeight = FontWeight.Bold)) }
+            }
+        }
+    }
+}
+
+/** Three keys of a keypad, pressing one after another. */
+@Composable
+internal fun ButtonsIcon(color: Color) {
+    val t by rememberInfiniteTransition(label = "keys").animateFloat(
+        0f, 3f, infiniteRepeatable(tween(2400, easing = LinearEasing)), label = "keys",
+    )
+    Canvas(Modifier.fillMaxSize()) {
+        inIconBox {
+            listOf(6f, 19f, 32f).forEachIndexed { i, x ->
+                // Each key dips for a moment while its turn comes round.
+                val dip = (1f - kotlin.math.abs(t - i - 0.5f) * 2f).coerceIn(0f, 1f) * 4f
+                drawRoundRect(color.copy(alpha = 0.45f), Offset(x, 16f + 4f), Size(10f, 16f),
+                    androidx.compose.ui.geometry.CornerRadius(3f))
+                drawRoundRect(color, Offset(x, 16f + dip), Size(10f, 16f), androidx.compose.ui.geometry.CornerRadius(3f))
+            }
+        }
+    }
+}
+
+/** Material's scalloped "cookie": a circle whose radius waves around its edge. */
+@Composable
+internal fun Cookie(color: Color, modifier: Modifier) {
+    Canvas(modifier) {
+        val unit = size.minDimension / 100f
+        val path = Path()
+        var deg = 0
+        while (deg <= 360) {
+            val a = deg * PI / 180
+            val r = (44 + 4.5 * cos(9 * a)) * unit
+            val x = center.x + (r * cos(a)).toFloat()
+            val y = center.y + (r * sin(a)).toFloat()
+            if (deg == 0) path.moveTo(x, y) else path.lineTo(x, y)
+            deg += 3
+        }
+        path.close()
+        drawPath(path, color)
+    }
+}
+
+/** Draws in the mockup's 48-unit icon box. */
+private inline fun DrawScope.inIconBox(block: DrawScope.() -> Unit) {
+    val s = size.minDimension / 48f
+    scale(s, s, Offset.Zero) { block() }
+}
+
+@Composable
+internal fun WifiIcon(color: Color) {
+    val t = rememberInfiniteTransition(label = "wifi")
+    val waves = (0..2).map { i ->
+        t.animateFloat(
+            0.35f, 1f,
+            infiniteRepeatable(tween(800, delayMillis = 0, easing = FastOutSlowInEasing), RepeatMode.Reverse,
+                initialStartOffset = androidx.compose.animation.core.StartOffset(i * 200)),
+            label = "wave$i",
+        )
+    }
+    Canvas(Modifier.fillMaxSize()) {
+        inIconBox {
+            val stroke = Stroke(5f, cap = StrokeCap.Round)
+            // The mockup's three arcs, inner to outer: radius r through (24 ± half, y).
+            listOf(Triple(8f, 6f, 34f), Triple(18f, 13f, 26f), Triple(28f, 20f, 18f)).forEachIndexed { i, (r, half, y) ->
+                val cy = y + sqrt(r * r - half * half)
+                val start = Math.toDegrees(atan2((y - cy).toDouble(), (-half).toDouble())).toFloat()
+                val end = Math.toDegrees(atan2((y - cy).toDouble(), half.toDouble())).toFloat()
+                drawArc(color.copy(alpha = waves[i].value), start, (end - start + 360f) % 360f, false,
+                    Offset(24f - r, cy - r), Size(2 * r, 2 * r), style = stroke)
+            }
+            drawCircle(color, 3.6f, Offset(24f, 41f))
+        }
+    }
+}
+
+@Composable
+internal fun MicIcon(color: Color) {
+    val t = rememberInfiniteTransition(label = "mic")
+    val waves = (0..1).map { i ->
+        t.animateFloat(
+            0.25f, 1f,
+            infiniteRepeatable(tween(700, easing = FastOutSlowInEasing), RepeatMode.Reverse,
+                initialStartOffset = androidx.compose.animation.core.StartOffset(i * 250)),
+            label = "mic$i",
+        )
+    }
+    Canvas(Modifier.fillMaxSize()) {
+        inIconBox {
+            drawRoundRect(color, Offset(18f, 5f), Size(12f, 22f), androidx.compose.ui.geometry.CornerRadius(6f))
+            val stroke = Stroke(4f, cap = StrokeCap.Round)
+            drawArc(color, 0f, 180f, false, Offset(12f, 14f), Size(24f, 22f), style = stroke)
+            drawLine(color, Offset(24f, 36f), Offset(24f, 42f), 4f, StrokeCap.Round)
+            // Sound waves either side, pulsing as if someone's talking.
+            listOf(1f to 0, -1f to 0, 1f to 1, -1f to 1).forEach { (side, i) ->
+                val r = if (i == 0) 15f else 21f
+                drawArc(color.copy(alpha = waves[i].value), if (side > 0) -35f else 145f, 70f, false,
+                    Offset(24f - r, 16f - r), Size(2 * r, 2 * r), style = stroke)
+            }
+        }
+    }
+}
+
+@Composable
+internal fun StarIcon(color: Color) {
+    val turn by rememberInfiniteTransition(label = "star").animateFloat(
+        -8f, 8f, infiniteRepeatable(tween(1600, easing = FastOutSlowInEasing), RepeatMode.Reverse), label = "star",
+    )
+    Canvas(Modifier.fillMaxSize()) {
+        inIconBox {
+            val star = Path()
+            for (i in 0 until 10) {
+                val r = if (i % 2 == 0) 20f else 8.5f
+                val a = (-90 + i * 36) * PI / 180
+                val x = 24f + (r * cos(a)).toFloat()
+                val y = 25f + (r * sin(a)).toFloat()
+                if (i == 0) star.moveTo(x, y) else star.lineTo(x, y)
+            }
+            star.close()
+            rotate(turn, Offset(24f, 25f)) { drawPath(star, color) }
+        }
+    }
+}
+
+@Composable
+internal fun HeartIcon(color: Color) {
+    val beat by rememberInfiniteTransition(label = "beat").animateFloat(
+        1f, 1f,
+        infiniteRepeatable(keyframes {
+            durationMillis = 1400
+            1f at 0; 1.16f at 210; 1f at 420; 1.1f at 630; 1f at 840
+        }),
+        label = "beat",
+    )
+    Canvas(Modifier.fillMaxSize()) {
+        inIconBox {
+            scale(beat, beat, Offset(24f, 24f)) {
+                val heart = Path().apply {
+                    moveTo(24f, 41f)
+                    cubicTo(10f, 31f, 5f, 23f, 5f, 16f)
+                    cubicTo(5f, 10f, 10f, 6f, 15f, 6f)
+                    cubicTo(19f, 6f, 22f, 8f, 24f, 12f)
+                    cubicTo(26f, 8f, 29f, 6f, 33f, 6f)
+                    cubicTo(38f, 6f, 43f, 10f, 43f, 16f)
+                    cubicTo(43f, 23f, 38f, 31f, 24f, 41f)
+                    close()
+                }
+                drawPath(heart, color)
+            }
+        }
+    }
+}
+
+@Composable
+internal fun Dots(c: IntroColors, count: Int, current: Int, cq: (Float) -> Dp, modifier: Modifier) {
+    Row(modifier, horizontalArrangement = Arrangement.spacedBy(cq(2f))) {
+        repeat(count) { i ->
+            val on = i == current
+            val width by animateDpAsState(if (on) cq(7f) else cq(2f), tween(300), label = "dot")
+            Box(
+                Modifier
+                    .size(width, cq(2f))
+                    .clip(RoundedCornerShape(50))
+                    .background(if (on) c.primary else c.outline.copy(alpha = 0.45f)),
+            )
+        }
+    }
+}
+

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/HomeCarSettings.kt

@@ -0,0 +1,245 @@
+package app.seb3thehacker.gearslip.ui
+
+import androidx.compose.foundation.clickable
+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.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import app.seb3thehacker.gearslip.car.AppTheme
+import app.seb3thehacker.gearslip.car.CarApps
+import app.seb3thehacker.gearslip.car.CarSettings
+import app.seb3thehacker.gearslip.car.NavBarMode
+import app.seb3thehacker.gearslip.car.NightMode
+import app.seb3thehacker.gearslip.car.Units
+import app.seb3thehacker.gearslip.car.theme.GsThemes
+
+/** The car's setting groups, each opening its own screen from the phone's home screen. */
+enum class CarGroup(val title: String) {
+    SCREEN("Screen"),
+    NAV_BAR("Nav bar and player"),
+    SOUND("Sound and voice"),
+    WARNINGS("Warnings"),
+}
+
+private val sizeChoices = listOf(1f to "Normal", 1.25f to "Large", 1.5f to "Extra large")
+private val themeChoices = listOf(AppTheme.PHONE to "Follow phone", AppTheme.LIGHT to "Light", AppTheme.DARK to "Dark")
+private val nightChoices = listOf(NightMode.AUTO to "Auto", NightMode.DAY to "Day", NightMode.NIGHT to "Night")
+private val unitChoices = listOf(Units.AUTO to "Auto", Units.IMPERIAL to "Imperial", Units.METRIC to "Metric")
+private val navBarChoices = listOf(
+    NavBarMode.SHOW to "Always show",
+    NavBarMode.HIDE_NAVIGATING to "Hide while navigating",
+    NavBarMode.HIDE to "Hide until tapped",
+)
+private fun openChoices() = listOf(CarSettings.HOME to "Home") + CarApps.all.filter { it.id != "settings" }.map { it.id to it.label }
+
+/**
+ * The car's settings on the phone's home screen: one card per group with a summary of where it
+ * stands, each opening a screen of its own. They are the same settings as the car's own Settings
+ * app, so a change in either shows in both; the phone is just the easier place when parked.
+ */
+@Composable
+internal fun HomeCarSettings(onOpen: (CarGroup) -> Unit, modifier: Modifier = Modifier) {
+    val scale by CarSettings.scale.collectAsState()
+    val open by CarSettings.openOnConnect.collectAsState()
+    val navBar by CarSettings.navBarMode.collectAsState()
+    val pipeAudio by CarSettings.pipeAudio.collectAsState()
+    val speakDirections by CarSettings.speakDirections.collectAsState()
+    val bluetoothWarning by CarSettings.bluetoothWarning.collectAsState()
+    val locationWarning by CarSettings.locationWarning.collectAsState()
+    val playerLeft by CarSettings.playerLeft.collectAsState()
+    val theme by CarSettings.appTheme.collectAsState()
+
+    fun summary(group: CarGroup) = when (group) {
+        CarGroup.SCREEN -> listOf(openChoices().label(open), sizeChoices.label(scale), themeChoices.label(theme))
+        CarGroup.NAV_BAR -> listOf(navBarChoices.label(navBar), "Player on the ${if (playerLeft) "left" else "right"}")
+        CarGroup.SOUND -> listOf(if (pipeAudio) "USB audio" else "Bluetooth audio", "Directions ${if (speakDirections) "on" else "off"}")
+        CarGroup.WARNINGS -> listOf(
+            "Bluetooth ${if (bluetoothWarning && !pipeAudio) "on" else "off"}",
+            "Location ${if (locationWarning) "on" else "off"}",
+        )
+    }.filter { it.isNotEmpty() }.joinToString(" · ")
+
+    Column(modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(12.dp)) {
+        Text(
+            "Car",
+            style = MaterialTheme.typography.headlineSmall,
+            fontWeight = FontWeight.Bold,
+            color = MaterialTheme.colorScheme.onBackground,
+            modifier = Modifier.padding(start = 4.dp),
+        )
+        SettingsCard {
+            CarGroup.entries.forEachIndexed { i, group ->
+                if (i > 0) SettingsDivider()
+                SettingsRow(
+                    group.title,
+                    Modifier.clickable { onOpen(group) },
+                    subtitle = summary(group),
+                    trailing = { Icon(Icons.AutoMirrored.Filled.KeyboardArrowRight, contentDescription = null) },
+                )
+            }
+        }
+    }
+}
+
+/** One group of the car's settings, on a screen of its own. */
+@OptIn(androidx.compose.material3.ExperimentalMaterial3Api::class)
+@Composable
+internal fun CarGroupScreen(group: CarGroup, onBack: () -> Unit) {
+    androidx.compose.material3.Scaffold(
+        containerColor = MaterialTheme.colorScheme.background,
+        topBar = {
+            androidx.compose.material3.TopAppBar(
+                title = { Text(group.title) },
+                navigationIcon = {
+                    androidx.compose.material3.IconButton(onClick = onBack) {
+                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Back")
+                    }
+                },
+            )
+        },
+    ) { padding ->
+        Column(
+            Modifier.fillMaxSize().padding(padding).padding(horizontal = 24.dp)
+                .verticalScroll(androidx.compose.foundation.rememberScrollState()),
+            verticalArrangement = Arrangement.spacedBy(16.dp),
+        ) {
+            SettingsCard { GroupRows(group) }
+            Text(
+                "These are the same settings as Settings in the car. A change here shows there too.",
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(horizontal = 16.dp),
+            )
+        }
+    }
+}
+
+@Composable
+private fun GroupRows(group: CarGroup) {
+    val scale by CarSettings.scale.collectAsState()
+    val open by CarSettings.openOnConnect.collectAsState()
+    val night by CarSettings.nightMode.collectAsState()
+    val units by CarSettings.units.collectAsState()
+    val navBar by CarSettings.navBarMode.collectAsState()
+    val pipeAudio by CarSettings.pipeAudio.collectAsState()
+    val speakDirections by CarSettings.speakDirections.collectAsState()
+    val systemSpeech by CarSettings.systemSpeech.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 theme by CarSettings.appTheme.collectAsState()
+    val uiTheme by CarSettings.uiTheme.collectAsState()
+
+    when (group) {
+        CarGroup.SCREEN -> {
+            Choice("Open on connect", openChoices(), open, CarSettings::setOpenOnConnect)
+            SettingsDivider()
+            Choice("Size", sizeChoices, scale, CarSettings::setScale)
+            SettingsDivider()
+            Choice("App theme", themeChoices, theme, CarSettings::setAppTheme)
+            SettingsDivider()
+            Choice("Buttons", GsThemes.builtIn.map { it.id to it.name }, uiTheme, CarSettings::setUiTheme)
+            SettingsDivider()
+            Choice("Map day/night", nightChoices, night, CarSettings::setNightMode)
+            SettingsDivider()
+            Choice("Units", unitChoices, units, CarSettings::setUnits)
+        }
+        CarGroup.NAV_BAR -> {
+            Choice("Nav bar", navBarChoices, navBar, CarSettings::setNavBarMode)
+            SettingsDivider()
+            Choice("Player in the nav bar", listOf(false to "Skip buttons", true to "Song title"), playerTitle, CarSettings::setPlayerTitle)
+            SettingsDivider()
+            Choice("Player beside the map", listOf(false to "Right", true to "Left"), playerLeft, CarSettings::setPlayerLeft)
+            SettingsDivider()
+            Toggle("Autoplay on connect", autoplay, CarSettings::setAutoplay)
+        }
+        CarGroup.SOUND -> {
+            Choice("Car audio", listOf(false to "Bluetooth", true to "USB"), pipeAudio, CarSettings::setPipeAudio)
+            SettingsDivider()
+            Toggle(
+                "Spoken directions",
+                speakDirections,
+                CarSettings::setSpeakDirections,
+                note = "Turn it off if your map app's own voice already plays in the car.",
+            )
+            SettingsDivider()
+            Toggle(
+                "Use the phone's speech recognition",
+                systemSpeech,
+                CarSettings::setSystemSpeech,
+                note = "On most phones that's Google's, which may send your voice to Google.",
+            )
+        }
+        CarGroup.WARNINGS -> {
+            if (!pipeAudio) {
+                Toggle("Warn when Bluetooth isn't connected", bluetoothWarning, CarSettings::setBluetoothWarning)
+                SettingsDivider()
+            }
+            Toggle("Warn when location is off", locationWarning, CarSettings::setLocationWarning)
+        }
+    }
+}
+
+private fun <T> List<Pair<T, String>>.label(value: T): String = firstOrNull { it.first == value }?.second.orEmpty()
+
+/** A setting with a few named choices: its current one shown, the rest a tap away. */
+@Composable
+private fun <T> Choice(title: String, choices: List<Pair<T, String>>, selected: T, onSelect: (T) -> Unit) {
+    var menu by remember { mutableStateOf(false) }
+    SettingsRow(
+        title,
+        Modifier.clickable { menu = true },
+        trailing = {
+            // The menu hangs from the value it changes, at the row's end.
+            Box {
+                Text(choices.label(selected), style = MaterialTheme.typography.bodyLarge, color = MaterialTheme.colorScheme.primary)
+                DropdownMenu(menu, onDismissRequest = { menu = false }) {
+                    choices.forEach { (value, label) ->
+                        DropdownMenuItem(
+                            text = { Text(label, fontWeight = if (value == selected) FontWeight.Bold else FontWeight.Normal) },
+                            onClick = {
+                                onSelect(value)
+                                menu = false
+                            },
+                        )
+                    }
+                }
+            }
+        },
+    )
+}
+
+@Composable
+private fun Toggle(title: String, on: Boolean, onChange: (Boolean) -> Unit, note: String? = null) {
+    SettingsRow(
+        title,
+        Modifier.clickable { onChange(!on) },
+        subtitle = note,
+        trailing = { Switch(checked = on, onCheckedChange = null) },
+    )
+}

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/HomeScreen.kt

@@ -68,6 +68,7 @@ fun HomeScreen(
     onOpenCarPreview: () -> Unit,
     onOpenLogs: () -> Unit,
     onDisconnect: () -> Unit,
+    onOpenCarGroup: (CarGroup) -> Unit,
 ) {
     val status by SessionStatus.state.collectAsStateWithLifecycle()
     val context = LocalContext.current
@@ -125,6 +126,9 @@ fun HomeScreen(
                     }
                     Spacer(Modifier.height(16.dp))
                     UpdateCard()
+                    Spacer(Modifier.height(24.dp))
+                    HomeCarSettings(onOpenCarGroup)
+                    Spacer(Modifier.height(16.dp))
                 }
 
                 // Sits at the bottom, where a thumb reaches it.

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/IntroScreen.kt

@@ -1,872 +0,0 @@
-package app.seb3thehacker.gearslip.ui
-
-import android.content.Context
-import android.content.Intent
-import android.net.Uri
-import android.provider.Settings
-import androidx.activity.compose.BackHandler
-import androidx.compose.animation.core.Animatable
-import androidx.compose.animation.core.CubicBezierEasing
-import androidx.compose.animation.core.FastOutSlowInEasing
-import androidx.compose.animation.core.LinearEasing
-import androidx.compose.animation.core.RepeatMode
-import androidx.compose.animation.core.animateDpAsState
-import androidx.compose.animation.core.animateFloat
-import androidx.compose.animation.core.infiniteRepeatable
-import androidx.compose.animation.core.keyframes
-import androidx.compose.animation.core.rememberInfiniteTransition
-import androidx.compose.animation.core.tween
-import androidx.compose.foundation.Canvas
-import androidx.compose.foundation.BorderStroke
-import androidx.compose.foundation.background
-import androidx.compose.foundation.border
-import androidx.compose.foundation.clickable
-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.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.layout.wrapContentWidth
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableIntStateOf
-import androidx.compose.runtime.mutableStateOf
-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.geometry.CornerRadius
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.geometry.Size
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.Path
-import androidx.compose.ui.graphics.StrokeCap
-import androidx.compose.ui.graphics.StrokeJoin
-import androidx.compose.ui.graphics.drawscope.DrawScope
-import androidx.compose.ui.graphics.drawscope.Stroke
-import androidx.compose.ui.graphics.drawscope.rotate
-import androidx.compose.ui.graphics.drawscope.scale
-import androidx.compose.ui.graphics.graphicsLayer
-import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.platform.LocalDensity
-import androidx.compose.ui.text.TextStyle
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.unit.Dp
-import androidx.compose.ui.unit.TextUnit
-import androidx.compose.ui.unit.dp
-import app.seb3thehacker.gearslip.BuildConfig
-import app.seb3thehacker.gearslip.CertProvider
-import app.seb3thehacker.gearslip.AppSettings
-import androidx.compose.runtime.collectAsState
-import androidx.compose.ui.draw.clipToBounds
-import androidx.compose.ui.draw.drawWithContent
-import androidx.compose.ui.graphics.BlendMode
-import androidx.compose.ui.graphics.Brush
-import androidx.compose.ui.graphics.CompositingStrategy
-import androidx.compose.foundation.layout.wrapContentHeight
-import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.PlayArrow
-import androidx.compose.material.icons.filled.Search
-import androidx.compose.runtime.CompositionLocalProvider
-import app.seb3thehacker.gearslip.car.CarSettings
-import app.seb3thehacker.gearslip.car.theme.GsButton
-import app.seb3thehacker.gearslip.car.theme.GsIconButton
-import app.seb3thehacker.gearslip.car.theme.GsThemes
-import app.seb3thehacker.gearslip.car.theme.GsTone
-import app.seb3thehacker.gearslip.car.theme.LocalGsTheme
-import app.seb3thehacker.gearslip.speech.SpeechModels
-import app.seb3thehacker.gearslip.stats.UsageStats
-import kotlin.math.PI
-import kotlin.math.cos
-import kotlin.math.atan2
-import kotlin.math.sqrt
-import kotlin.math.sin
-import kotlin.random.Random
-import kotlinx.coroutines.delay
-
-/**
- * The release intro: a few screens shown once after updating to a new release, before setup. New
- * installs skip it. Its look follows the 0.3 mockup: Material shapes in the phone's own colours,
- * with every size taken from the screen's width so it scales from small phones to tablets.
- */
-object Intro {
-    private const val PREFS = "intro"
-    private const val KEY_SEEN = "seen_release"
-    private const val KEY_STEP = "step"
-
-    /** "0.3" from "0.3.00-alpha": the intro belongs to a release, not to each patch. */
-    val release: String = BuildConfig.VERSION_NAME.split('.').take(2).joinToString(".")
-
-    /**
-     * True once per release for people who used Gearslip before. A new install, or one with its
-     * data cleared, gets the setup guide instead: there's nothing "new" yet, so this release
-     * counts as seen and the next one shows. Install dates can't tell those apart, since
-     * clearing data keeps them, so this goes by what setup left behind; 0.2 saved the same.
-     */
-    fun due(context: Context): Boolean {
-        if (context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).getString(KEY_SEEN, null) == release) return false
-        val usedBefore = AppSettings.hasSeenPermissionsSetup(context) ||
-            AppSettings.hasSkippedCertSetup(context) || CertProvider.hasAnyCert(context)
-        if (!usedBefore) {
-            markSeen(context)
-            return false
-        }
-        return true
-    }
-
-    fun markSeen(context: Context) {
-        context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).edit()
-            .putString(KEY_SEEN, release)
-            .remove(KEY_STEP)
-            .apply()
-    }
-
-    /** The page the intro was on, so an app restart part-way through resumes there. */
-    internal fun savedStep(context: Context): String? =
-        context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).getString(KEY_STEP, null)
-
-    internal fun saveStep(context: Context, step: String) {
-        context.getSharedPreferences(PREFS, Context.MODE_PRIVATE).edit().putString(KEY_STEP, step).apply()
-    }
-}
-
-/** The intro's tones, taken from the phone's own Material You colours like the rest of the app. */
-internal class IntroColors(
-    val surface: Color, val onSurface: Color, val onVariant: Color, val outline: Color,
-    val primary: Color, val onPrimary: Color, val primaryC: Color, val onPrimaryC: Color,
-    val tertiaryC: Color, val onTertiaryC: Color, val secondaryC: Color, val onSecondaryC: Color,
-)
-
-@Composable
-internal fun introColors(): IntroColors {
-    val m = MaterialTheme.colorScheme
-    return IntroColors(
-        surface = m.surface, onSurface = m.onSurface, onVariant = m.onSurfaceVariant, outline = m.outline,
-        primary = m.primary, onPrimary = m.onPrimary, primaryC = m.primaryContainer, onPrimaryC = m.onPrimaryContainer,
-        tertiaryC = m.tertiaryContainer, onTertiaryC = m.onTertiaryContainer,
-        secondaryC = m.secondaryContainer, onSecondaryC = m.onSecondaryContainer,
-    )
-}
-
-/** In the order shown: what's new, what to pick, housekeeping, then the people behind it. */
-private enum class IntroStep { WELCOME, WIRELESS, KNOBS, VOICE, THEME, APPS, GRAPHENE, CHAT, THANKS }
-
-private val Pop = CubicBezierEasing(0.3f, 1.6f, 0.5f, 1f)
-private val Rise = CubicBezierEasing(0.2f, 0.8f, 0.2f, 1f)
-
-@Composable
-fun IntroScreen(onDone: () -> Unit) {
-    val context = LocalContext.current
-    val c = introColors()
-    // The GrapheneOS screen is only news to people running it.
-    val steps = remember {
-        IntroStep.entries.filter { it != IntroStep.GRAPHENE || UsageStats.osName(context) == "GrapheneOS" }
-    }
-    // Turning exploit protection back on restarts the app, so the intro picks up where it was.
-    var index by remember {
-        mutableIntStateOf(steps.indexOfFirst { it.name == Intro.savedStep(context) }.coerceAtLeast(0))
-    }
-    val step = steps[index]
-    LaunchedEffect(step) { Intro.saveStep(context, step.name) }
-    val finish = {
-        Intro.markSeen(context)
-        onDone()
-    }
-    BackHandler(enabled = index > 0) { index-- }
-
-    BoxWithConstraints(Modifier.fillMaxSize().background(c.surface)) {
-        val w = maxWidth
-        val h = maxHeight
-        // The mockup's cqw: one percent of the screen's width.
-        fun cq(n: Float): Dp = w * (n / 100f)
-        val density = LocalDensity.current
-        fun cqSp(n: Float): TextUnit = with(density) { cq(n).toSp() }
-
-        // The step on top, Back and Next under it, the same as the setup guide.
-        Column(Modifier.fillMaxSize()) {
-        Box(Modifier.weight(1f).fillMaxWidth()) {
-        when (step) {
-            IntroStep.WELCOME -> Welcome(c, ::cq, ::cqSp, h)
-            IntroStep.WIRELESS -> BadgeStep(c, ::cq, ::cqSp, c.secondaryC, "Wireless.",
-                "If your car does wireless Android Auto, pair once and leave the cable at home.", step) { WifiIcon(c.onSecondaryC) }
-            IntroStep.KNOBS -> BadgeStep(c, ::cq, ::cqSp, c.tertiaryC, "Knobs work.",
-                "Turn, push, done. No touchscreen? Gearslip doesn't need one anymore.", step) { DialIcon(c.onTertiaryC) }
-            IntroStep.VOICE -> VoiceStep(c, ::cq, ::cqSp, step)
-            IntroStep.GRAPHENE -> BadgeStep(c, ::cq, ::cqSp, c.secondaryC, "Protections back on.",
-                "On GrapheneOS, Gearslip no longer needs exploit protection compatibility mode. If you " +
-                    "turned it on for Gearslip, turn it off to get full protection back.", step,
-                action = "Open app settings" to {
-                    runCatching {
-                        context.startActivity(
-                            Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.fromParts("package", context.packageName, null)),
-                        )
-                    }
-                },
-                outlined = true,
-            ) { ShieldIcon(c.onSecondaryC, c.secondaryC) }
-            IntroStep.THANKS -> BadgeStep(c, ::cq, ::cqSp, c.tertiaryC, "Thank you.",
-                "Thanks to your usage notes, Gearslip is confirmed to work in cars newer than 2020. " +
-                    "Each note shows which cars work and which still fail, so I know what to fix next.", step,
-                action = "See which cars work" to { GearslipLinks.open(context, GearslipLinks.CARS) },
-                outlined = true,
-                secondAction = "Support on Liberapay" to { GearslipLinks.open(context, GearslipLinks.LIBERAPAY) },
-            ) { HeartIcon(c.onTertiaryC) }
-            IntroStep.CHAT -> BadgeStep(c, ::cq, ::cqSp, c.primaryC, "Come say hi.",
-                "Gearslip has a chat room on Matrix. Talk with other drivers about cars, apps, and " +
-                    "where Gearslip is headed.", step,
-                action = "Join on Matrix" to { GearslipLinks.open(context, GearslipLinks.MATRIX) },
-                outlined = true,
-            ) { ChatIcon(c.onPrimaryC, c.primaryC) }
-            IntroStep.APPS -> BadgeStep(c, ::cq, ::cqSp, c.secondaryC, "Good company.",
-                "Free, open-source apps that work well in the car. The first in each row works best. Tap one to see it on GitHub.", step,
-                extra = { AppPicks(c, ::cq, ::cqSp, step) }) { StarIcon(c.onSecondaryC) }
-            IntroStep.THEME -> BadgeStep(c, ::cq, ::cqSp, c.tertiaryC, "Your buttons.",
-                "Pick how the car's buttons look. Change it any time in the car's settings.", step,
-                extra = { ThemePicker(c, ::cq, ::cqSp, step) }) { ButtonsIcon(c.onTertiaryC) }
-        }
-        }
-        Column(Modifier.fillMaxWidth().padding(horizontal = cq(8f))) {
-            Dots(c, steps.size, index, ::cq, Modifier.align(Alignment.CenterHorizontally))
-            Spacer(Modifier.height(cq(5f)))
-            PillRow(
-                c, ::cq, ::cqSp,
-                onBack = if (index > 0) ({ index-- }) else null,
-                label = if (index == steps.lastIndex) "Start" else "Next",
-            ) { if (index < steps.lastIndex) index++ else finish() }
-            Spacer(Modifier.height(cq(6f)))
-        }
-        }
-    }
-}
-
-/** 0 to 1 once each time [key] changes, after [delayMs]: drives the entrance of one element. */
-@Composable
-internal fun entrance(key: Any, delayMs: Int, durationMs: Int = 650): Float {
-    val a = remember(key) { Animatable(0f) }
-    LaunchedEffect(key) {
-        delay(delayMs.toLong())
-        a.animateTo(1f, tween(durationMs, easing = LinearEasing))
-    }
-    return a.value
-}
-
-/** Slides up and fades in, like the mockup's `up`. */
-internal fun Modifier.up(p: Float, distance: Dp) = graphicsLayer {
-    val e = Rise.transform(p)
-    alpha = e
-    translationY = (1 - e) * distance.toPx()
-}
-
-/** Grows in with a bounce, like the mockup's `bounce`. */
-internal fun Modifier.pop(p: Float) = graphicsLayer {
-    val e = Pop.transform(p)
-    alpha = p.coerceAtMost(1f)
-    scaleX = 0.5f + 0.5f * e
-    scaleY = 0.5f + 0.5f * e
-}
-
-@Composable
-private fun Welcome(c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, height: Dp) {
-    val key = IntroStep.WELCOME
-    val spin by rememberInfiniteTransition(label = "spin").animateFloat(
-        0f, 360f, infiniteRepeatable(tween(18_000, easing = LinearEasing)), label = "spin",
-    )
-    Box(Modifier.fillMaxSize()) {
-        Cookie(c.primaryC, Modifier.size(cq(120f)).offset(x = cq(28f), y = -cq(22f)).align(Alignment.TopEnd).graphicsLayer { rotationZ = spin; alpha = 0.9f })
-        Ticker(c.secondaryC, c.onSecondaryC, "OPEN SOURCE ✦ NO ACCOUNT ✦ YOUR CAR, YOUR PHONE ✦ ", cq, cqSp, reverse = true, tilt = 3f,
-            key = key, modifier = Modifier.align(Alignment.TopCenter).padding(top = height * 0.11f))
-
-        Column(Modifier.align(Alignment.CenterStart).padding(horizontal = cq(8f))) {
-            Text("Welcome to", color = c.onVariant, style = TextStyle(fontSize = cqSp(4.2f), fontWeight = FontWeight.SemiBold),
-                modifier = Modifier.up(entrance(key, 100), cq(7f)))
-            Text(
-                Intro.release, color = c.primary,
-                style = TextStyle(fontSize = cqSp(44f), fontWeight = FontWeight.Black, letterSpacing = cqSp(-2.4f), lineHeight = cqSp(38f)),
-                modifier = Modifier.offset(x = -cq(1.5f)).pop(entrance(key, 250, 900)),
-            )
-            Text(
-                "alpha · the big one", color = c.onTertiaryC,
-                style = TextStyle(fontSize = cqSp(4f), fontWeight = FontWeight.Bold),
-                modifier = Modifier.padding(top = cq(4f)).up(entrance(key, 700), cq(7f))
-                    .clip(RoundedCornerShape(50)).background(c.tertiaryC).padding(horizontal = cq(4.4f), vertical = cq(2.2f)),
-            )
-        }
-
-        Confetti(c, key, Modifier.fillMaxSize())
-    }
-}
-
-/** A tilted band of words scrolling past, slid in from the side when the step opens. */
-@Composable
-private fun Ticker(
-    bg: Color, fg: Color, words: String, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit,
-    reverse: Boolean, tilt: Float, key: Any, modifier: Modifier,
-) {
-    val enter = entrance(key, 400, 800)
-    val scroll by rememberInfiniteTransition(label = "ticker").animateFloat(
-        0f, 1f, infiniteRepeatable(tween(if (reverse) 20_000 else 16_000, easing = LinearEasing)), label = "ticker",
-    )
-    Box(
-        modifier
-            .fillMaxWidth()
-            .graphicsLayer {
-                rotationZ = tilt
-                scaleX = 1.2f
-                val e = Rise.transform(enter)
-                alpha = e
-                translationX = (1 - e) * -cq(30f).toPx()
-            }
-            .background(bg)
-            .padding(vertical = cq(2.6f)),
-    ) {
-        Text(
-            words.repeat(4),
-            color = fg, maxLines = 1, softWrap = false,
-            style = TextStyle(fontSize = cqSp(5f), fontWeight = FontWeight.ExtraBold),
-            modifier = Modifier
-                .wrapContentWidth(Alignment.Start, unbounded = true)
-                .graphicsLayer {
-                    // The text holds the words four times; sliding by half loops cleanly.
-                    val shift = size.width / 2f * (if (reverse) 1 - scroll else scroll)
-                    translationX = -shift
-                },
-        )
-    }
-}
-
-/** Material shapes thrown once from behind the version number. */
-@Composable
-private fun Confetti(c: IntroColors, key: Any, modifier: Modifier) {
-    val p = entrance(key, 450, 1300)
-    val bits = remember {
-        val r = Random(7)
-        List(22) { i ->
-            val a = i / 22f * 2 * PI.toFloat() + r.nextFloat() * 0.4f
-            val d = 30f + r.nextFloat() * 45f
-            Bit(cos(a) * d, sin(a) * d * 1.2f, r.nextInt(-270, 270).toFloat(), i % 4, i % 3)
-        }
-    }
-    if (p <= 0f || p >= 1f) return
-    val tones = listOf(c.primary, c.primaryC, c.tertiaryC, c.secondaryC)
-    Canvas(modifier) {
-        val unit = size.width / 100f
-        val e = CubicBezierEasing(0.15f, 0.7f, 0.3f, 1f).transform(p)
-        val alpha = if (p < 0.7f) 1f else 1f - (p - 0.7f) / 0.3f
-        val origin = Offset(size.width * 0.3f, size.height * 0.42f)
-        bits.forEach { b ->
-            val at = origin + Offset(b.dx * unit * e, b.dy * unit * e)
-            val s = 3.6f * unit * (0.3f + 0.7f * e)
-            rotate(b.spin * e, at) {
-                val color = tones[b.tone].copy(alpha = alpha)
-                when (b.shape) {
-                    0 -> drawCircle(color, s / 2, at)
-                    1 -> drawRoundRect(color, at - Offset(s / 2, s / 2), Size(s, s), androidx.compose.ui.geometry.CornerRadius(unit))
-                    else -> drawRoundRect(color, at - Offset(s / 2, s / 4), Size(s, s / 2), androidx.compose.ui.geometry.CornerRadius(s / 4))
-                }
-            }
-        }
-    }
-}
-
-private class Bit(val dx: Float, val dy: Float, val spin: Float, val tone: Int, val shape: Int)
-
-/** One idea per screen: a spinning cookie with an icon, a headline, a line of text, maybe a button. */
-@Composable
-private fun BadgeStep(
-    c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, badge: Color,
-    title: String, body: String, key: Any,
-    action: Pair<String, () -> Unit>? = null, outlined: Boolean = false,
-    secondAction: Pair<String, () -> Unit>? = null,
-    extra: (@Composable () -> Unit)? = null,
-    icon: @Composable () -> Unit,
-) {
-    val spin by rememberInfiniteTransition(label = "spin").animateFloat(
-        0f, 360f, infiniteRepeatable(tween(18_000, easing = LinearEasing)), label = "spin",
-    )
-    Column(
-        Modifier.fillMaxSize().padding(horizontal = cq(8f)),
-        verticalArrangement = Arrangement.Center,
-    ) {
-        Box(Modifier.size(cq(34f)).pop(entrance(key, 50, 800)), contentAlignment = Alignment.Center) {
-            Cookie(badge, Modifier.fillMaxSize().graphicsLayer { rotationZ = spin })
-            Box(Modifier.size(cq(15f))) { icon() }
-        }
-        Spacer(Modifier.height(cq(8f)))
-        Text(
-            title, color = c.onSurface,
-            style = TextStyle(fontSize = cqSp(13.5f), fontWeight = FontWeight.Black, letterSpacing = cqSp(-0.6f), lineHeight = cqSp(12.5f)),
-            modifier = Modifier.up(entrance(key, 200, 700), cq(7f)),
-        )
-        Spacer(Modifier.height(cq(4f)))
-        Text(
-            body, color = c.onVariant,
-            style = TextStyle(fontSize = cqSp(4.5f), lineHeight = cqSp(6.5f)),
-            modifier = Modifier.up(entrance(key, 350, 700), cq(7f)),
-        )
-        extra?.invoke()
-        listOfNotNull(action, secondAction).forEachIndexed { i, (label, onClick) ->
-            Spacer(Modifier.height(if (i > 0) cq(3f) else if (outlined) cq(7f) else cq(9f)))
-            Text(
-                label,
-                color = if (outlined) c.primary else c.onPrimary,
-                style = TextStyle(fontSize = cqSp(if (outlined) 4.4f else 4.6f), fontWeight = FontWeight.Bold),
-                modifier = Modifier
-                    .up(entrance(key, 500 + i * 150, 700), cq(7f))
-                    .clip(RoundedCornerShape(50))
-                    .then(
-                        if (outlined) Modifier.border(BorderStroke(2.dp, c.outline), RoundedCornerShape(50))
-                        else Modifier.background(c.primary),
-                    )
-                    .clickable(onClick = onClick)
-                    .padding(horizontal = if (outlined) cq(7f) else cq(9f), vertical = if (outlined) cq(3.6f) else cq(4.2f)),
-            )
-        }
-    }
-}
-
-/**
- * Voice: a few things to say, drifting past, and a button that fetches both speech models so the
- * assistant works the first time someone tries it in the car.
- */
-@Composable
-private fun VoiceStep(c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, key: IntroStep) {
-    val context = LocalContext.current
-    remember { SpeechModels.init(context) }
-    val needed = SpeechModels.RECOMMENDED
-    val states = needed.map { SpeechModels.state(it).collectAsState().value }
-    val ready = states.all { it == SpeechModels.State.Ready }
-    val label = when {
-        states.any { it is SpeechModels.State.Downloading } ->
-            "Downloading, ${needed.zip(states).sumOf { (m, st) -> m.downloadMb * percentOf(st) } / needed.sumOf { it.downloadMb }}%"
-        states.any { it is SpeechModels.State.Failed } -> "Download failed. Try again"
-        else -> "Download voice, ${needed.sumOf { it.downloadMb }} MB"
-    }
-    BadgeStep(
-        c, cq, cqSp, c.primaryC, "Just say it.",
-        "Tap the mic, or press the talk button on your wheel, and speak. Your phone turns speech " +
-            "into text by itself, and nothing you say leaves it. Say \"help\" in the car for the full list.",
-        key,
-        action = if (ready) null else label to { SpeechModels.downloadRecommended(context) },
-        outlined = true,
-        extra = { CommandDrift(c, cq, cqSp, key) },
-    ) { MicIcon(c.onPrimaryC) }
-}
-
-private fun percentOf(state: SpeechModels.State) = when (state) {
-    SpeechModels.State.Ready -> 100
-    is SpeechModels.State.Downloading -> state.percent
-    else -> 0
-}
-
-private val SAMPLE_COMMANDS = listOf(
-    "Play Daft Punk", "What's playing?", "Next song",
-    "Call Mom", "Open Organic Maps", "Pause", "Help",
-)
-
-/** Example commands rising slowly through a window that fades at both edges. */
-@Composable
-private fun CommandDrift(c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, key: Any) {
-    val scroll by rememberInfiniteTransition(label = "drift").animateFloat(
-        0f, 1f, infiniteRepeatable(tween(SAMPLE_COMMANDS.size * 2_200, easing = LinearEasing)), label = "drift",
-    )
-    Box(
-        Modifier
-            .padding(top = cq(6f))
-            .fillMaxWidth()
-            .height(cq(34f))
-            .up(entrance(key, 500, 700), cq(7f))
-            .graphicsLayer { compositingStrategy = CompositingStrategy.Offscreen }
-            .drawWithContent {
-                drawContent()
-                drawRect(
-                    Brush.verticalGradient(0f to Color.Transparent, 0.25f to Color.Black, 0.75f to Color.Black, 1f to Color.Transparent),
-                    blendMode = BlendMode.DstIn,
-                )
-            }
-            .clipToBounds(),
-    ) {
-        Column(
-            Modifier
-                .wrapContentHeight(Alignment.Top, unbounded = true)
-                // The list is there twice; rising by half loops cleanly.
-                .graphicsLayer { translationY = -size.height / 2f * scroll },
-            verticalArrangement = Arrangement.spacedBy(cq(2.4f)),
-        ) {
-            repeat(2) {
-                SAMPLE_COMMANDS.forEach { say ->
-                    Text(
-                        "\u201c$say\u201d", color = c.onSecondaryC,
-                        style = TextStyle(fontSize = cqSp(4.4f), fontWeight = FontWeight.SemiBold),
-                        modifier = Modifier
-                            .clip(RoundedCornerShape(50))
-                            .background(c.secondaryC)
-                            .padding(horizontal = cq(4.4f), vertical = cq(2f)),
-                    )
-                }
-            }
-        }
-    }
-}
-
-/** Each kind of app with its picks, the first recommended most. */
-private val APP_PICKS = listOf(
-    "Maps" to listOf(
-        "Organic Maps" to "https://github.com/organicmaps/organicmaps",
-        "Vela" to "https://github.com/PimpinPumpkin/Vela",
-    ),
-    "Music" to listOf(
-        "ViVi Music" to "https://github.com/vivizzz007/vivi-music",
-        "Metrolist" to "https://github.com/MetrolistGroup/Metrolist",
-    ),
-    "Podcasts" to listOf(
-        "AntennaPod" to "https://github.com/AntennaPod/AntennaPod",
-    ),
-)
-
-/** One row per kind, with a chip per app opening its GitHub page; the rows arrive one after another. */
-@Composable
-private fun AppPicks(c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, key: IntroStep) {
-    val context = LocalContext.current
-    Column(Modifier.padding(top = cq(6f)), verticalArrangement = Arrangement.spacedBy(cq(2.6f))) {
-        APP_PICKS.forEachIndexed { i, (kind, apps) ->
-            Column(
-                Modifier
-                    .fillMaxWidth()
-                    .up(entrance(key, 500 + i * 120, 700), cq(7f))
-                    .clip(RoundedCornerShape(cq(5f)))
-                    .background(c.secondaryC)
-                    .padding(horizontal = cq(4f), vertical = cq(3f)),
-            ) {
-                Text(kind.uppercase(), color = c.onSecondaryC.copy(alpha = 0.7f),
-                    style = TextStyle(fontSize = cqSp(3.2f), fontWeight = FontWeight.Bold, letterSpacing = cqSp(0.3f)),
-                    modifier = Modifier.padding(start = cq(1f), bottom = cq(1.6f)))
-                Row(horizontalArrangement = Arrangement.spacedBy(cq(2f))) {
-                    apps.forEach { (name, url) ->
-                        Text(
-                            "$name ↗", color = c.onSecondaryC,
-                            style = TextStyle(fontSize = cqSp(4.4f), fontWeight = FontWeight.ExtraBold),
-                            maxLines = 1,
-                            modifier = Modifier
-                                .clip(RoundedCornerShape(50))
-                                .border(BorderStroke(1.5.dp, c.onSecondaryC.copy(alpha = 0.35f)), RoundedCornerShape(50))
-                                .clickable {
-                                    runCatching {
-                                        context.startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(url)).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
-                                    }
-                                }
-                                .padding(horizontal = cq(3.6f), vertical = cq(2f)),
-                        )
-                    }
-                }
-            }
-        }
-    }
-}
-
-/**
- * The car's button styles side by side, each drawn in its own style, and a row of real car
- * controls below that redraws in whichever is picked. Picking saves it, so the car shows it too.
- */
-@Composable
-private fun ThemePicker(c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, key: IntroStep) {
-    val chosenId by CarSettings.uiTheme.collectAsState()
-    val chosen = GsThemes.byId(chosenId)
-    // Flat first: it's the default.
-    val themes = listOf(GsThemes.Flat) + GsThemes.builtIn.filter { it != GsThemes.Flat }
-    Column(
-        Modifier.padding(top = cq(7f)).fillMaxWidth().up(entrance(key, 500, 700), cq(7f)),
-        verticalArrangement = Arrangement.spacedBy(cq(6f)),
-    ) {
-        Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(cq(3f))) {
-            themes.forEach { theme ->
-                CompositionLocalProvider(LocalGsTheme provides theme) {
-                    GsButton(
-                        onClick = { CarSettings.setUiTheme(theme.id) },
-                        modifier = Modifier.weight(1f),
-                        tone = if (theme == chosen) GsTone.Primary else GsTone.Neutral,
-                        contentPadding = PaddingValues(horizontal = cq(1f), vertical = cq(3f)),
-                    ) {
-                        Text(
-                            if (theme == chosen) "✓ ${theme.name}" else theme.name,
-                            style = TextStyle(fontSize = cqSp(4.2f), fontWeight = FontWeight.Bold),
-                            maxLines = 1,
-                        )
-                    }
-                }
-            }
-        }
-        // What the car shows: the player's controls and a full-width action.
-        CompositionLocalProvider(LocalGsTheme provides chosen) {
-            Row(
-                Modifier.fillMaxWidth(),
-                horizontalArrangement = Arrangement.spacedBy(cq(3f)),
-                verticalAlignment = Alignment.CenterVertically,
-            ) {
-                GsIconButton(Icons.Filled.Search, "Search", onClick = {}, size = cq(15f), iconSize = cq(7f))
-                GsIconButton(Icons.Filled.PlayArrow, "Play", onClick = {}, tone = GsTone.Primary, size = cq(15f), iconSize = cq(8f))
-                GsButton(
-                    onClick = {},
-                    modifier = Modifier.weight(1f).height(cq(15f)),
-                    tone = GsTone.Tonal,
-                ) { Text("Navigate", style = TextStyle(fontSize = cqSp(4.6f), fontWeight = FontWeight.Bold)) }
-            }
-        }
-    }
-}
-
-/** Three keys of a keypad, pressing one after another. */
-@Composable
-private fun ButtonsIcon(color: Color) {
-    val t by rememberInfiniteTransition(label = "keys").animateFloat(
-        0f, 3f, infiniteRepeatable(tween(2400, easing = LinearEasing)), label = "keys",
-    )
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            listOf(6f, 19f, 32f).forEachIndexed { i, x ->
-                // Each key dips for a moment while its turn comes round.
-                val dip = (1f - kotlin.math.abs(t - i - 0.5f) * 2f).coerceIn(0f, 1f) * 4f
-                drawRoundRect(color.copy(alpha = 0.45f), Offset(x, 16f + 4f), Size(10f, 16f),
-                    androidx.compose.ui.geometry.CornerRadius(3f))
-                drawRoundRect(color, Offset(x, 16f + dip), Size(10f, 16f), androidx.compose.ui.geometry.CornerRadius(3f))
-            }
-        }
-    }
-}
-
-/** Material's scalloped "cookie": a circle whose radius waves around its edge. */
-@Composable
-internal fun Cookie(color: Color, modifier: Modifier) {
-    Canvas(modifier) {
-        val unit = size.minDimension / 100f
-        val path = Path()
-        var deg = 0
-        while (deg <= 360) {
-            val a = deg * PI / 180
-            val r = (44 + 4.5 * cos(9 * a)) * unit
-            val x = center.x + (r * cos(a)).toFloat()
-            val y = center.y + (r * sin(a)).toFloat()
-            if (deg == 0) path.moveTo(x, y) else path.lineTo(x, y)
-            deg += 3
-        }
-        path.close()
-        drawPath(path, color)
-    }
-}
-
-/** Draws in the mockup's 48-unit icon box. */
-private inline fun DrawScope.inIconBox(block: DrawScope.() -> Unit) {
-    val s = size.minDimension / 48f
-    scale(s, s, Offset.Zero) { block() }
-}
-
-@Composable
-internal fun WifiIcon(color: Color) {
-    val t = rememberInfiniteTransition(label = "wifi")
-    val waves = (0..2).map { i ->
-        t.animateFloat(
-            0.35f, 1f,
-            infiniteRepeatable(tween(800, delayMillis = 0, easing = FastOutSlowInEasing), RepeatMode.Reverse,
-                initialStartOffset = androidx.compose.animation.core.StartOffset(i * 200)),
-            label = "wave$i",
-        )
-    }
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            val stroke = Stroke(5f, cap = StrokeCap.Round)
-            // The mockup's three arcs, inner to outer: radius r through (24 ± half, y).
-            listOf(Triple(8f, 6f, 34f), Triple(18f, 13f, 26f), Triple(28f, 20f, 18f)).forEachIndexed { i, (r, half, y) ->
-                val cy = y + sqrt(r * r - half * half)
-                val start = Math.toDegrees(atan2((y - cy).toDouble(), (-half).toDouble())).toFloat()
-                val end = Math.toDegrees(atan2((y - cy).toDouble(), half.toDouble())).toFloat()
-                drawArc(color.copy(alpha = waves[i].value), start, (end - start + 360f) % 360f, false,
-                    Offset(24f - r, cy - r), Size(2 * r, 2 * r), style = stroke)
-            }
-            drawCircle(color, 3.6f, Offset(24f, 41f))
-        }
-    }
-}
-
-@Composable
-private fun DialIcon(color: Color) {
-    val angle by rememberInfiniteTransition(label = "dial").animateFloat(
-        -70f, -70f,
-        infiniteRepeatable(keyframes {
-            durationMillis = 2600
-            -70f at 0 using CubicBezierEasing(0.5f, 0f, 0.3f, 1f)
-            70f at 1040
-            70f at 1430 using CubicBezierEasing(0.5f, 0f, 0.3f, 1f)
-            -70f at 2470
-        }),
-        label = "dial",
-    )
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            drawCircle(color, 19f, Offset(24f, 24f), style = Stroke(5f))
-            rotate(angle, Offset(24f, 24f)) {
-                drawRoundRect(color, Offset(21.5f, 7f), Size(5f, 13f), androidx.compose.ui.geometry.CornerRadius(2.5f))
-            }
-        }
-    }
-}
-
-@Composable
-internal fun MicIcon(color: Color) {
-    val t = rememberInfiniteTransition(label = "mic")
-    val waves = (0..1).map { i ->
-        t.animateFloat(
-            0.25f, 1f,
-            infiniteRepeatable(tween(700, easing = FastOutSlowInEasing), RepeatMode.Reverse,
-                initialStartOffset = androidx.compose.animation.core.StartOffset(i * 250)),
-            label = "mic$i",
-        )
-    }
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            drawRoundRect(color, Offset(18f, 5f), Size(12f, 22f), androidx.compose.ui.geometry.CornerRadius(6f))
-            val stroke = Stroke(4f, cap = StrokeCap.Round)
-            drawArc(color, 0f, 180f, false, Offset(12f, 14f), Size(24f, 22f), style = stroke)
-            drawLine(color, Offset(24f, 36f), Offset(24f, 42f), 4f, StrokeCap.Round)
-            // Sound waves either side, pulsing as if someone's talking.
-            listOf(1f to 0, -1f to 0, 1f to 1, -1f to 1).forEach { (side, i) ->
-                val r = if (i == 0) 15f else 21f
-                drawArc(color.copy(alpha = waves[i].value), if (side > 0) -35f else 145f, 70f, false,
-                    Offset(24f - r, 16f - r), Size(2 * r, 2 * r), style = stroke)
-            }
-        }
-    }
-}
-
-@Composable
-internal fun StarIcon(color: Color) {
-    val turn by rememberInfiniteTransition(label = "star").animateFloat(
-        -8f, 8f, infiniteRepeatable(tween(1600, easing = FastOutSlowInEasing), RepeatMode.Reverse), label = "star",
-    )
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            val star = Path()
-            for (i in 0 until 10) {
-                val r = if (i % 2 == 0) 20f else 8.5f
-                val a = (-90 + i * 36) * PI / 180
-                val x = 24f + (r * cos(a)).toFloat()
-                val y = 25f + (r * sin(a)).toFloat()
-                if (i == 0) star.moveTo(x, y) else star.lineTo(x, y)
-            }
-            star.close()
-            rotate(turn, Offset(24f, 25f)) { drawPath(star, color) }
-        }
-    }
-}
-
-@Composable
-internal fun ShieldIcon(color: Color, tick: Color) {
-    val p = entrance(IntroStep.GRAPHENE, 800, 500)
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            val shield = Path().apply {
-                moveTo(24f, 4f); lineTo(40f, 10f); lineTo(40f, 22f)
-                cubicTo(40f, 32f, 33f, 40f, 24f, 44f)
-                cubicTo(15f, 40f, 8f, 32f, 8f, 22f)
-                lineTo(8f, 10f); close()
-            }
-            drawPath(shield, color)
-            drawPartialStroke(listOf(Offset(16f, 24f), Offset(22f, 30f), Offset(33f, 18f)), p, tick, 4.5f)
-        }
-    }
-}
-
-/** A speech bubble with three dots that pulse, like someone typing. */
-@Composable
-private fun ChatIcon(color: Color, dots: Color) {
-    val t = rememberInfiniteTransition(label = "typing")
-    val pulse = (0..2).map { i ->
-        t.animateFloat(
-            0.35f, 1f,
-            infiniteRepeatable(tween(500, easing = FastOutSlowInEasing), RepeatMode.Reverse,
-                initialStartOffset = androidx.compose.animation.core.StartOffset(i * 170)),
-            label = "dot$i",
-        )
-    }
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            drawRoundRect(color, Offset(4f, 7f), Size(40f, 28f), CornerRadius(10f, 10f))
-            drawPath(Path().apply { moveTo(12f, 33f); lineTo(10f, 43f); lineTo(22f, 33f); close() }, color)
-            pulse.forEachIndexed { i, a -> drawCircle(dots.copy(alpha = a.value), 3.2f, Offset(15f + i * 9f, 21f)) }
-        }
-    }
-}
-
-@Composable
-internal fun HeartIcon(color: Color) {
-    val beat by rememberInfiniteTransition(label = "beat").animateFloat(
-        1f, 1f,
-        infiniteRepeatable(keyframes {
-            durationMillis = 1400
-            1f at 0; 1.16f at 210; 1f at 420; 1.1f at 630; 1f at 840
-        }),
-        label = "beat",
-    )
-    Canvas(Modifier.fillMaxSize()) {
-        inIconBox {
-            scale(beat, beat, Offset(24f, 24f)) {
-                val heart = Path().apply {
-                    moveTo(24f, 41f)
-                    cubicTo(10f, 31f, 5f, 23f, 5f, 16f)
-                    cubicTo(5f, 10f, 10f, 6f, 15f, 6f)
-                    cubicTo(19f, 6f, 22f, 8f, 24f, 12f)
-                    cubicTo(26f, 8f, 29f, 6f, 33f, 6f)
-                    cubicTo(38f, 6f, 43f, 10f, 43f, 16f)
-                    cubicTo(43f, 23f, 38f, 31f, 24f, 41f)
-                    close()
-                }
-                drawPath(heart, color)
-            }
-        }
-    }
-}
-
-/** A polyline drawn up to [progress] of its length, so a tick can sweep in. */
-private fun DrawScope.drawPartialStroke(points: List<Offset>, progress: Float, color: Color, width: Float) {
-    if (progress <= 0f) return
-    val lengths = points.zipWithNext { a, b -> (b - a).getDistance() }
-    var left = lengths.sum() * FastOutSlowInEasing.transform(progress.coerceAtMost(1f))
-    val path = Path().apply { moveTo(points[0].x, points[0].y) }
-    for (i in lengths.indices) {
-        if (left <= 0f) break
-        val f = (left / lengths[i]).coerceAtMost(1f)
-        val to = points[i] + (points[i + 1] - points[i]) * f
-        path.lineTo(to.x, to.y)
-        left -= lengths[i]
-    }
-    drawPath(path, color, style = Stroke(width, cap = StrokeCap.Round, join = StrokeJoin.Round))
-}
-
-@Composable
-internal fun Dots(c: IntroColors, count: Int, current: Int, cq: (Float) -> Dp, modifier: Modifier) {
-    Row(modifier, horizontalArrangement = Arrangement.spacedBy(cq(2f))) {
-        repeat(count) { i ->
-            val on = i == current
-            val width by animateDpAsState(if (on) cq(7f) else cq(2f), tween(300), label = "dot")
-            Box(
-                Modifier
-                    .size(width, cq(2f))
-                    .clip(RoundedCornerShape(50))
-                    .background(if (on) c.primary else c.outline.copy(alpha = 0.45f)),
-            )
-        }
-    }
-}
-

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/RecommendedApps.kt

@@ -57,6 +57,9 @@ private val recommended = listOf(
     "Podcasts" to listOf(
         RecommendedApp("AntennaPod", "de.danoeh.antennapod", "https://github.com/AntennaPod/AntennaPod", "Podcasts, chapters and all."),
     ),
+    "Other cool apps" to listOf(
+        RecommendedApp("RF Sentinel", "com.rfsentinel.app", "https://github.com/CIS-C0/RFSentinel", "Spots trackers and cameras nearby."),
+    ),
 )
 
 /** Opened from Settings: the same list the setup guide ends with. */
@@ -135,11 +138,13 @@ private fun AppRow(app: RecommendedApp, onOpen: () -> Unit) {
             if (icon != null) {
                 Image(icon.toBitmap(96, 96).asImageBitmap(), contentDescription = null, Modifier.fillMaxSize())
             } else {
-                Text(app.name.take(1), style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold)
+                Text(app.name.take(1), style = MaterialTheme.typography.titleMedium, fontWeight = FontWeight.Bold, color = MaterialTheme.colorScheme.onSurface)
             }
         }
         Column(Modifier.weight(1f).padding(horizontal = 14.dp)) {
-            Text(app.name, style = MaterialTheme.typography.titleMedium)
+            // Colours set outright: the setup guide draws this on its own background, with no
+            // Surface to hand down a content colour, and unset text came out dark on dark.
+            Text(app.name, style = MaterialTheme.typography.titleMedium, color = MaterialTheme.colorScheme.onSurface)
             Text(app.about, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
             if (icon != null) {
                 Row(verticalAlignment = Alignment.CenterVertically, modifier = Modifier.padding(top = 4.dp)) {

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/SettingsScreen.kt

@@ -200,6 +200,14 @@ private fun DebugSection() {
             subtitle = "Posts a message notification to read on the car",
             icon = Icons.AutoMirrored.Filled.Send,
         )
+        SettingsDivider()
+        val badge by CarSettings.debugBadge.collectAsState()
+        SettingsRow(
+            "Debug badge on the car screen",
+            Modifier.clickable { CarSettings.setDebugBadge(!badge) },
+            subtitle = "Turn it off for screenshots",
+            trailing = { Switch(checked = badge, onCheckedChange = null) },
+        )
     }
 }
 
@@ -221,7 +229,7 @@ private fun CarAudioSection() {
         SettingsRow(
             "USB",
             Modifier.selectable(usb, role = Role.RadioButton) { CarSettings.setPipeAudio(true) },
-            subtitle = "Clearer sound with no delay. Android asks to share audio once each drive",
+            subtitle = "Clearer sound with no delay. Each drive, Android asks you to share your screen, which lets Gearslip send the sound",
             trailing = { RadioButton(selected = usb, onClick = null) },
         )
     }

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/SetupGuideScreen.kt

@@ -93,6 +93,9 @@ import app.seb3thehacker.gearslip.host.AndroidAuto
 import app.seb3thehacker.gearslip.notify.GearslipNotificationListener
 import app.seb3thehacker.gearslip.stats.UsageStats
 import androidx.compose.runtime.DisposableEffect
+import androidx.compose.animation.core.RepeatMode
+import androidx.compose.animation.core.FastOutSlowInEasing
+import androidx.compose.foundation.layout.offset
 
 /**
  * One page of the guide. [permissions] drives a system permission dialog; [command] is an adb
@@ -100,6 +103,9 @@ import androidx.compose.runtime.DisposableEffect
  * settings screen) without by itself finishing the page. Everything is skippable: none of this
  * can be verified as done, only offered.
  */
+/** The guide's colours and its one-percent-of-the-width scale, for content that sizes itself the same way. */
+internal class GuideScale(val c: IntroColors, val cq: (Float) -> Dp, val cqSp: (Float) -> TextUnit)
+
 private class GuidePage(
     val title: String,
     /** Plain text, or an [AnnotatedString] when part of it needs to stand out. */
@@ -112,8 +118,8 @@ private class GuidePage(
     val command: String? = null,
     val actionLabel: String? = null,
     val onAction: (() -> Unit)? = null,
-    /** Drawn under [explanation]. */
-    val content: (@Composable () -> Unit)? = null,
+    /** Drawn under [explanation], sized off the same screen-width scale as the page. */
+    val content: (@Composable (GuideScale) -> Unit)? = null,
     /** Only shown when the driver picked USB audio on the car audio page. */
     val usbOnly: Boolean = false,
 )
@@ -365,20 +371,24 @@ private fun pages(context: Context, onRequestCallScreening: () -> Unit): List<Gu
         )
     }
 
-    // --- Apps worth installing, once everything above is set up -----------------------
-    if (SHOW_RECOMMENDED_APPS) {
-        add(
-            GuidePage(
-                title = "Good company.",
-                explanation = RECOMMENDED_INTRO,
-                icon = { StarIcon(it) },
-                content = { RecommendedAppsList() },
-            ),
-        )
-    }
-
-    // --- The very end, every time: usage notes. On a replay, the switch shows what was
-    // chosen before.
+    // --- At the end, every time: apps worth installing, how the car's buttons look, and last
+    // the usage notes. On a replay, the switch shows what was chosen before.
+    add(
+        GuidePage(
+            title = "Good company.",
+            explanation = RECOMMENDED_INTRO,
+            icon = { StarIcon(it) },
+            content = { RecommendedAppsList() },
+        ),
+    )
+    add(
+        GuidePage(
+            title = "Your buttons.",
+            explanation = "Pick how the car's buttons look. Change it any time in the car's settings.",
+            icon = { ButtonsIcon(it) },
+            content = { ThemePicker(it.c, it.cq, it.cqSp, key = "guide-buttons") },
+        ),
+    )
     add(usageNotesPage(context))
 }
 
@@ -417,7 +427,7 @@ private fun AudioChoice() {
         ) { CarSettings.setPipeAudio(false) }
         AudioCard(
             "USB", null,
-            "Clearer sound with no delay. Android asks to share audio once each drive.",
+            "Clearer sound with no delay. Each drive, Android asks you to share your screen, which lets Gearslip send the sound.",
             selected = usb,
         ) { CarSettings.setPipeAudio(true) }
     }
@@ -509,10 +519,11 @@ fun SetupGuideScreen(onRequestCallScreening: () -> Unit, onDone: () -> Unit, onl
             // pushes them off the screen. Short pages sit in the middle.
             BoxWithConstraints(Modifier.weight(1f).fillMaxWidth()) {
                 key(index) {
+                    val scroll = rememberScrollState()
                     Column(
                         Modifier
                             .fillMaxWidth()
-                            .verticalScroll(rememberScrollState())
+                            .verticalScroll(scroll)
                             .heightIn(min = maxHeight)
                             .padding(vertical = cq(6f)),
                         verticalArrangement = Arrangement.Center,
@@ -550,7 +561,7 @@ fun SetupGuideScreen(onRequestCallScreening: () -> Unit, onDone: () -> Unit, onl
                                 style = TextStyle(fontSize = cqSp(4.5f), lineHeight = cqSp(6.5f)),
                             )
                             page.command?.let { CopyableCommand(it) }
-                            page.content?.invoke()
+                            page.content?.invoke(GuideScale(c, ::cq, ::cqSp))
                             if (page.permissions != null && alreadyGranted) {
                                 Text(
                                     "Already allowed.", color = c.primary,
@@ -559,6 +570,9 @@ fun SetupGuideScreen(onRequestCallScreening: () -> Unit, onDone: () -> Unit, onl
                             }
                         }
                     }
+                    // A long page (the app list, the usage notes) says so: a fade over the
+                    // last lines and a nudge to keep going, until the bottom is in view.
+                    if (scroll.canScrollForward) ScrollHint(c, ::cq, ::cqSp, Modifier.align(Alignment.BottomCenter))
                 }
             }
 
@@ -585,6 +599,28 @@ fun SetupGuideScreen(onRequestCallScreening: () -> Unit, onDone: () -> Unit, onl
     }
 }
 
+/** A fade into the page's background with "Scroll for more" over it, at the bottom of a page that goes on. */
+@Composable
+private fun ScrollHint(c: IntroColors, cq: (Float) -> Dp, cqSp: (Float) -> TextUnit, modifier: Modifier = Modifier) {
+    val bob by rememberInfiniteTransition(label = "hint").animateFloat(
+        0f, 1f, infiniteRepeatable(tween(900, easing = FastOutSlowInEasing), RepeatMode.Reverse), label = "bob",
+    )
+    Box(
+        modifier
+            .fillMaxWidth()
+            .height(cq(22f))
+            .background(androidx.compose.ui.graphics.Brush.verticalGradient(listOf(c.surface.copy(alpha = 0f), c.surface))),
+        contentAlignment = Alignment.BottomCenter,
+    ) {
+        Text(
+            "Scroll for more  ↓",
+            color = c.primary,
+            style = TextStyle(fontSize = cqSp(4f), fontWeight = FontWeight.Bold),
+            modifier = Modifier.padding(bottom = cq(2f)).offset(y = cq(1.2f) * bob),
+        )
+    }
+}
+
 internal enum class PillStyle { FILLED, OUTLINED, TEXT }
 
 /** The intro's rounded buttons: filled for the step's main action, outlined beside it, bare text to skip. */

gearslip/src/main/java/app/seb3thehacker/gearslip/wireless/WirelessLink.kt

@@ -87,6 +87,8 @@ object WirelessLink {
     val busy: Boolean get() = worker?.isAlive == true
     /** Set when Android drops the car's network mid-try, so the rest don't bind to a dead one. */
     @Volatile private var lostNetwork: Network? = null
+    /** The car network asked for or joined, until Android says it's gone or never came. */
+    @Volatile private var activeSsid: String? = null
     /** Bumped on each Wi-Fi join and on stop, so an older run of TCP tries ends instead of racing the new one. */
     @Volatile private var tcpRun = 0
     private val writeLock = Any()
@@ -131,6 +133,7 @@ object WirelessLink {
             runCatching { context.getSystemService(ConnectivityManager::class.java).unregisterNetworkCallback(cb) }
         }
         network = null
+        activeSsid = null
         // Stopped before the car's session began, so nothing else resets Home's card.
         if (starting) {
             log.i("wireless start-up stopped")
@@ -223,6 +226,14 @@ object WirelessLink {
                         val bssid = text(3)
                         val security = Wire.varint(f, 4) ?: -1
                         log.i("<- InfoResponse: ssid=\"$ssid\" bssid=$bssid security=$security password=${if (password.isEmpty()) "none" else "(${password.length} chars)"}")
+                        // ZLink head units send the Wi-Fi details again once the stream is up.
+                        // Asking Android for the network again releases the one carrying the
+                        // stream, which aborts its socket; a phone running Android Auto just
+                        // carries on, so the repeat is ignored while that network is in use.
+                        if (ssid == activeSsid) {
+                            log.i("InfoResponse again for \"$ssid\", which the phone is already on - ignoring it")
+                            continue
+                        }
                         val join = { ip: String, port: Int -> joinWifi(context, output, name, ssid, password, bssid, ip, port) }
                         val known = target
                         if (known != null) {
@@ -332,6 +343,7 @@ object WirelessLink {
             }
 
             override fun onUnavailable() {
+                if (activeSsid == ssid) activeSsid = null
                 log.w("Wi-Fi: couldn't join \"$ssid\" (declined, out of range, or wrong password)")
                 runCatching { send(output, MSG_CONNECTION_STATUS, Protobuf.varintField(1, -1)) }
                 SessionStatus.failed(
@@ -356,6 +368,7 @@ object WirelessLink {
 
             override fun onLost(net: Network) {
                 lostNetwork = net
+                if (activeSsid == ssid) activeSsid = null
                 log.w(
                     "Wi-Fi: lost \"$ssid\" - Android dropped the car's network. Picking it by hand " +
                         "in the Wi-Fi list does this; the remaining tries go over the phone's own Wi-Fi",
@@ -364,6 +377,7 @@ object WirelessLink {
         }
         network?.let { runCatching { manager.unregisterNetworkCallback(it) } }
         network = callback
+        activeSsid = ssid
         manager.requestNetwork(request, callback, WIFI_WAIT_MS)
     }
 

gearslip/src/main/res/values/themes.xml

@@ -9,4 +9,12 @@
         <item name="android:windowNoTitle">true</item>
         <item name="windowActionBar">false</item>
     </style>
+
+    <!-- For PermissionActivity: only Android's own permission dialog shows, over whatever was there. -->
+    <style name="Theme.Gearslip.Invisible" parent="Theme.Gearslip">
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowAnimationStyle">@null</item>
+        <item name="android:backgroundDimEnabled">false</item>
+    </style>
 </resources>

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ espressoCore = "3.7.0"
 lifecycleRuntimeKtx = "2.10.0"
 activityCompose = "1.13.0"
 composeBom = "2026.05.01"
-carApp = "1.7.0"
+carApp = "1.8.0-rc01"
 appcompat = "1.7.1"
 material = "1.14.0"
 constraintlayout = "2.2.1"