Android Media3 MediaSessionService не производит уведомление ⇐ Android

[Anonymous]

As Android documentation says:

A MediaSessionService will automatically create a MediaStyle notification for you in the form of a MediaNotification.

So I implemented a minimal MediaSessionService which supports "playing" a song and Получение его метаданных. Я могу управлять им, используя MediaController из моей деятельности, но нет уведомления, чтобы управлять им за пределами приложения. Чего мне не хватает? < /P>
Служба: < /p>
@OptIn(UnstableApi::class)
class PlaybackService : MediaSessionService() {
private val _job = SupervisorJob()
private var _mediaSession: MediaSession? = null

override fun onCreate() {
super.onCreate()

val scope = CoroutineScope(Dispatchers.IO + _job)
_mediaSession = MediaSession.Builder(this, Player(mainLooper, scope)).build()
}

override fun onDestroy() {
_mediaSession?.player?.release();
_mediaSession?.release();

_job.cancel()

super.onDestroy()
}

override fun onGetSession(controllerInfo: MediaSession.ControllerInfo): MediaSession? {
return _mediaSession
}

private class Player(looper: Looper, val scope: CoroutineScope) : SimpleBasePlayer(looper) {
private val _logger = Logger.getLogger("PlaybackService")

private val _availableCommands: Commands = Commands.Builder().addAll(
COMMAND_PLAY_PAUSE,
COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM,
COMMAND_SEEK_TO_NEXT_MEDIA_ITEM,
COMMAND_GET_CURRENT_MEDIA_ITEM,
COMMAND_GET_METADATA
).build();

private val _metadata = MediaMetadata.Builder()
.setArtist("Artist")
.setTitle("Title")
.build()

private val _audioAttributes = AudioAttributes.Builder()
.setContentType(C.AUDIO_CONTENT_TYPE_MUSIC)
.setUsage(C.USAGE_MEDIA)
.build()

override fun getState(): State {
return State.Builder()
.setAvailableCommands(_availableCommands)
.setPlaylist(listOf(MediaItemData.Builder("")
.setMediaMetadata(_metadata)
.build()))
.setAudioAttributes(_audioAttributes)
.build()
}

override fun handleSetPlayWhenReady(playWhenReady: Boolean) = scope.future {
onPlayPause(playWhenReady)
}

private suspend fun onPlayPause(play: Boolean) {
delay(500)
if (play)
_logger.info("Play command invoked.")
else
_logger.info("Pause command invoked.")
}
}
}

MediaController Использование:
override fun onStart() {
super.onStart()

val context = requireContext()
val sessionToken = SessionToken(context, ComponentName(context, PlaybackService::class.java))
val future = MediaController.Builder(context, sessionToken).buildAsync();
future.addListener({
val mediaController = future.get()
mediaController.play()
val metadata = mediaController.mediaMetadata
}, MoreExecutors.directExecutor())
}


Подробнее здесь: https://stackoverflow.com/questions/795 ... tification