audio pause when unplugged, theme tweak

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

@@ -338,6 +338,8 @@ class GearslipActivity : ComponentActivity(), Projection {
     }
 
     override fun onProjectionStopped() {
+        // Before the car UI goes, while the media connection is still up.
+        app.seb3thehacker.gearslip.car.CarServices.pausePhoneMedia()
         runOnUiThread {
             PhoneMirror.requestStop()
             app.seb3thehacker.gearslip.car.CarKeys.focusSink = null

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

@@ -200,6 +200,32 @@ object CarServices {
         return playingPackages.firstNotNullOfOrNull { pkg -> catalog.firstOrNull { it.component.packageName == pkg } }
     }
 
+    /**
+     * The car went away mid-song: pause it, as Android Auto does, so it doesn't carry on out of
+     * the phone's speaker. Unplugging a USB accessory isn't "audio becoming noisy" the way
+     * headphones are, so the apps won't pause themselves. Every playing session is paused, not
+     * just the one Gearslip opened: anything the car was playing was going through the car.
+     */
+    fun pausePhoneMedia() {
+        val ctx = context ?: return
+        val manager = ctx.getSystemService(MediaSessionManager::class.java)
+        val listener = ComponentName(ctx, GearslipNotificationListener::class.java)
+        val playing = try {
+            manager.getActiveSessions(listener).filter { it.playbackState?.state == PlaybackState.STATE_PLAYING }
+        } catch (e: SecurityException) {
+            null
+        }
+        if (playing == null) {
+            // No notification access: the app Gearslip itself is driving is all it can reach.
+            mediaOrNull()?.let { if (it.now.value.playing) it.togglePlay() }
+            return
+        }
+        playing.forEach { runCatching { it.transportControls.pause() } }
+        if (playing.isNotEmpty()) {
+            app.seb3thehacker.gearslip.GearslipLog.i("media: paused ${playing.joinToString { it.packageName }} as the car left")
+        }
+    }
+
     /** The car went away: nothing should keep running for a screen that no longer exists. */
     fun shutdown() {
         context?.let { app.seb3thehacker.gearslip.notify.CarMotion.stop(it) }

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

@@ -50,6 +50,8 @@ enum class HoldMarkerStyle {
  * colour, so the peel's flap matches whatever it sits on. Round and pill-shaped controls get the
  * dot whatever the theme says: a circle has no corner to peel.
  */
+private const val SHOW_HOLD_DOT = false
+
 @Composable
 internal fun BoxScope.GsHoldMarker(style: HoldMarkerStyle, container: Color, shape: Shape, press: InteractionSource) {
     if (style == HoldMarkerStyle.NONE) return
@@ -68,8 +70,9 @@ internal fun BoxScope.GsHoldMarker(style: HoldMarkerStyle, container: Color, sha
         val side = min(size.width, size.height)
         val r = (shape as? CornerBasedShape)?.topEnd?.toPx(size, this) ?: 0f
         val round = r >= side * 0.4f
+        // The dot is off until it's redesigned: flat themes and round controls show nothing.
         if (style == HoldMarkerStyle.DOT || round) {
-            drawHoldDot(r, side, ink)
+            if (SHOW_HOLD_DOT) drawHoldDot(r, side, ink)
         } else {
             // Drawn for the bottom-right corner, then flipped up to the top-right.
             scale(1f, -1f, pivot = center) {