feat: rewrite RadioPlaybackService as MediaLibraryService with browse tree

Made-with: Cursor

app/src/main/java/xyz/cottongin/radio247/service/NotificationHelper.kt

@@ -1,65 +0,0 @@
-package xyz.cottongin.radio247.service
-
-import android.app.Notification
-import android.app.NotificationChannel
-import android.app.NotificationManager
-import android.app.PendingIntent
-import android.content.Context
-import androidx.core.app.NotificationCompat
-import android.support.v4.media.session.MediaSessionCompat
-import xyz.cottongin.radio247.R
-import xyz.cottongin.radio247.audio.IcyMetadata
-import xyz.cottongin.radio247.audio.MetadataFormatter
-import xyz.cottongin.radio247.data.model.Station
-
-class NotificationHelper(private val context: Context) {
-    companion object {
-        const val CHANNEL_ID = "radio_playback"
-        const val NOTIFICATION_ID = 1
-    }
-
-    fun createChannel() {
-        val channel = NotificationChannel(
-            CHANNEL_ID,
-            "Radio Playback",
-            NotificationManager.IMPORTANCE_LOW
-        ).apply {
-            description = "24/7 Radio playback"
-        }
-        context.getSystemService(NotificationManager::class.java)
-            .createNotificationChannel(channel)
-    }
-
-    fun buildNotification(
-        station: Station,
-        metadata: IcyMetadata?,
-        isReconnecting: Boolean,
-        mediaSession: MediaSessionCompat,
-        stopPendingIntent: PendingIntent
-    ): Notification {
-        return NotificationCompat.Builder(context, CHANNEL_ID)
-            .setContentTitle(station.name)
-            .setContentText(
-                when {
-                    isReconnecting -> "Reconnecting..."
-                    metadata != null -> MetadataFormatter.formatTrackInfo(metadata, fallback = "Playing")
-                    else -> "Playing"
-                }
-            )
-            .setSmallIcon(R.drawable.ic_notification)
-            .setOngoing(true)
-            .setStyle(
-                androidx.media.app.NotificationCompat.MediaStyle()
-                    .setMediaSession(mediaSession.sessionToken)
-                    .setShowActionsInCompactView(0)
-            )
-            .addAction(
-                NotificationCompat.Action.Builder(
-                    android.R.drawable.ic_media_pause,
-                    "Stop",
-                    stopPendingIntent
-                ).build()
-            )
-            .build()
-    }
-}

app/src/main/java/xyz/cottongin/radio247/service/RadioPlaybackService.kt

@@ -1,18 +1,27 @@
 package xyz.cottongin.radio247.service
 
 import android.app.PendingIntent
-import android.app.Service
 import android.content.Context
 import android.content.Intent
 import android.net.ConnectivityManager
 import android.net.Network
 import android.net.NetworkCapabilities
 import android.net.NetworkRequest
-import android.os.IBinder
+import android.os.Bundle
 import android.os.PowerManager
 import android.util.Log
-import androidx.lifecycle.LifecycleService
+import com.google.common.util.concurrent.SettableFuture
-import android.support.v4.media.session.MediaSessionCompat
+import androidx.media3.common.MediaItem
+import androidx.media3.common.MediaMetadata
+import androidx.media3.session.CommandButton
+import androidx.media3.session.LibraryResult
+import androidx.media3.session.MediaLibraryService
+import androidx.media3.session.MediaSession
+import androidx.media3.session.SessionCommand
+import androidx.media3.session.SessionResult
+import com.google.common.collect.ImmutableList
+import com.google.common.util.concurrent.Futures
+import com.google.common.util.concurrent.ListenableFuture
 import xyz.cottongin.radio247.RadioApplication
 import xyz.cottongin.radio247.audio.AudioEngine
 import xyz.cottongin.radio247.audio.AudioEngineEvent
@@ -25,6 +34,7 @@ import xyz.cottongin.radio247.data.db.StationDao
 import xyz.cottongin.radio247.data.model.ConnectionSpan
 import xyz.cottongin.radio247.data.model.ListeningSession
 import xyz.cottongin.radio247.data.model.MetadataSnapshot
+import xyz.cottongin.radio247.data.model.Playlist
 import xyz.cottongin.radio247.data.model.Station
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -42,7 +52,7 @@ import kotlinx.coroutines.Job
 
 class ConnectionFailedException(cause: Throwable) : Exception("Connection failed", cause)
 
-class RadioPlaybackService : LifecycleService() {
+class RadioPlaybackService : MediaLibraryService() {
     companion object {
         private const val TAG = "RadioPlayback"
         const val ACTION_PLAY = "xyz.cottongin.radio247.PLAY"
@@ -64,11 +74,12 @@ class RadioPlaybackService : LifecycleService() {
     private val connectionSpanDao: ConnectionSpanDao get() = database.connectionSpanDao()
     private val metadataSnapshotDao: MetadataSnapshotDao get() = database.metadataSnapshotDao()
 
-    private val notificationHelper = NotificationHelper(this)
     private val serviceScope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
     private val reconnectionMutex = Mutex()
 
-    private var mediaSession: MediaSessionCompat? = null
+    private var mediaSession: MediaLibraryService.MediaLibrarySession? = null
+    private var playerAdapter: RadioPlayerAdapter? = null
+    private val seekToLiveCommand = SessionCommand("SEEK_TO_LIVE", Bundle.EMPTY)
     private var engine: AudioEngine? = null
     private var wakeLock: PowerManager.WakeLock? = null
     private var wifiLock: android.net.wifi.WifiManager.WifiLock? = null
@@ -101,12 +112,16 @@ class RadioPlaybackService : LifecycleService() {
         controller.updateState(newState)
     }
 
+    override fun onGetSession(controllerInfo: MediaSession.ControllerInfo): MediaLibraryService.MediaLibrarySession? {
+        return mediaSession
+    }
+
     override fun onCreate() {
         super.onCreate()
-        notificationHelper.createChannel()
     }
 
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        super.onStartCommand(intent, flags, startId)
         when (intent?.action) {
             ACTION_PLAY -> {
                 val stationId = intent.getLongExtra(EXTRA_STATION_ID, -1L)
@@ -150,8 +165,6 @@ class RadioPlaybackService : LifecycleService() {
         }
     }
 
-    override fun onBind(intent: Intent): IBinder? = null
-
     override fun onDestroy() {
         cleanupResources()
         serviceScope.cancel()
@@ -164,6 +177,8 @@ class RadioPlaybackService : LifecycleService() {
         releaseLocks()
         mediaSession?.release()
         mediaSession = null
+        playerAdapter?.clearState()
+        playerAdapter = null
         unregisterNetworkCallback()
         controller.updateLatency(0)
     }
@@ -181,7 +196,8 @@ class RadioPlaybackService : LifecycleService() {
 
         acquireLocks()
         ensureMediaSession()
-        startForegroundWithPlaceholder(station)
+        playerAdapter?.updateStation(station)
+        playerAdapter?.updatePlaybackState(PlaybackState.Connecting(station))
 
         try {
             val urls = app.streamResolver.resolveUrls(station)
@@ -200,15 +216,15 @@ class RadioPlaybackService : LifecycleService() {
             val currentState = controller.state.value
             when {
                 currentState is PlaybackState.Paused -> {
-                    updateNotification(station, currentMetadata, isReconnecting = false, isPaused = true)
+                    playerAdapter?.updatePlaybackState(PlaybackState.Paused(station = station, metadata = currentMetadata, sessionStartedAt = sessionStartedAt))
                 }
                 else -> {
                     val isActiveJob = playJob == coroutineContext[Job]
                     if (isActiveJob) {
                         transition(PlaybackState.Idle)
+                        playerAdapter?.updatePlaybackState(PlaybackState.Idle)
                         endListeningSession()
                         cleanupResources()
-                        stopForeground(Service.STOP_FOREGROUND_REMOVE)
                         stopSelf()
                     }
                 }
@@ -256,20 +272,199 @@ class RadioPlaybackService : LifecycleService() {
     }
 
     private fun ensureMediaSession() {
-        if (mediaSession == null) {
+        if (mediaSession != null) return
-            mediaSession = MediaSessionCompat(this, "Radio247").apply {
+
-                setFlags(
+        val adapter = RadioPlayerAdapter(
-                    MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS or
+            onPlay = {
-                        MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS
+                val state = controller.state.value
+                val station = when (state) {
+                    is PlaybackState.Playing -> state.station
+                    is PlaybackState.Paused -> state.station
+                    is PlaybackState.Connecting -> state.station
+                    is PlaybackState.Reconnecting -> state.station
+                    is PlaybackState.Idle -> null
+                }
+                station?.let { controller.play(it) }
+            },
+            onStop = { controller.stop() }
+        )
+        playerAdapter = adapter
+
+        val sessionActivityIntent = packageManager
+            .getLaunchIntentForPackage(packageName)
+            ?.let { intent ->
+                PendingIntent.getActivity(
+                    this, 0, intent,
+                    PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
                 )
-                setCallback(object : MediaSessionCompat.Callback() {
-                    override fun onStop() {
-                        this@RadioPlaybackService.controller.stop()
-                    }
-                })
-                isActive = true
             }
+
+        val seekToLiveButton = CommandButton.Builder(CommandButton.ICON_SKIP_FORWARD)
+            .setDisplayName("Live")
+            .setSessionCommand(seekToLiveCommand)
+            .build()
+
+        mediaSession = MediaLibrarySession.Builder(this, adapter, LibrarySessionCallback())
+            .also { builder ->
+                sessionActivityIntent?.let { builder.setSessionActivity(it) }
+            }
+            .setCustomLayout(listOf(seekToLiveButton))
+            .build()
+    }
+
+    private inner class LibrarySessionCallback : MediaLibraryService.MediaLibrarySession.Callback {
+
+        override fun onGetLibraryRoot(
+            session: MediaLibraryService.MediaLibrarySession,
+            browser: MediaSession.ControllerInfo,
+            params: MediaLibraryService.LibraryParams?
+        ): ListenableFuture<LibraryResult<MediaItem>> {
+            val root = MediaItem.Builder()
+                .setMediaId("root")
+                .setMediaMetadata(
+                    MediaMetadata.Builder()
+                        .setIsBrowsable(true)
+                        .setIsPlayable(false)
+                        .setMediaType(MediaMetadata.MEDIA_TYPE_FOLDER_MIXED)
+                        .build()
+                )
+                .build()
+            return Futures.immediateFuture(LibraryResult.ofItem(root, params))
         }
+
+        override fun onGetChildren(
+            session: MediaLibraryService.MediaLibrarySession,
+            browser: MediaSession.ControllerInfo,
+            parentId: String,
+            page: Int,
+            pageSize: Int,
+            params: MediaLibraryService.LibraryParams?
+        ): ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> {
+            val future = SettableFuture.create<LibraryResult<ImmutableList<MediaItem>>>()
+            serviceScope.launch {
+                try {
+                    val items = when {
+                        parentId == "root" -> buildRootChildren()
+                        parentId == "unsorted" -> buildUnsortedStations()
+                        parentId.startsWith("playlist:") -> {
+                            val playlistId = parentId.removePrefix("playlist:").toLong()
+                            buildPlaylistStations(playlistId)
+                        }
+                        else -> emptyList()
+                    }
+                    future.set(LibraryResult.ofItemList(ImmutableList.copyOf(items), params))
+                } catch (_: Exception) {
+                    future.set(LibraryResult.ofError(LibraryResult.RESULT_ERROR_UNKNOWN))
+                }
+            }
+            return future
+        }
+
+        override fun onCustomCommand(
+            session: MediaSession,
+            controller: MediaSession.ControllerInfo,
+            customCommand: SessionCommand,
+            args: Bundle
+        ): ListenableFuture<SessionResult> {
+            if (customCommand.customAction == "SEEK_TO_LIVE") {
+                handleSeekLive()
+                return Futures.immediateFuture(SessionResult(SessionResult.RESULT_SUCCESS))
+            }
+            return super.onCustomCommand(session, controller, customCommand, args)
+        }
+
+        override fun onConnect(
+            session: MediaSession,
+            controller: MediaSession.ControllerInfo
+        ): MediaSession.ConnectionResult {
+            val sessionCommands = MediaSession.ConnectionResult.DEFAULT_SESSION_AND_LIBRARY_COMMANDS
+                .buildUpon()
+                .add(seekToLiveCommand)
+                .build()
+            return MediaSession.ConnectionResult.AcceptedResultBuilder(session)
+                .setAvailableSessionCommands(sessionCommands)
+                .build()
+        }
+
+        override fun onAddMediaItems(
+            mediaSession: MediaSession,
+            controller: MediaSession.ControllerInfo,
+            mediaItems: MutableList<MediaItem>
+        ): ListenableFuture<List<MediaItem>> {
+            val item = mediaItems.firstOrNull()
+                ?: return Futures.immediateFuture(emptyList())
+            val mediaId = item.mediaId
+            if (mediaId.startsWith("station:")) {
+                val stationId = mediaId.removePrefix("station:").toLongOrNull()
+                if (stationId != null) {
+                    serviceScope.launch {
+                        val station = stationDao.getStationById(stationId)
+                        station?.let { this@RadioPlaybackService.controller.play(it) }
+                    }
+                }
+            }
+            return Futures.immediateFuture(mediaItems)
+        }
+    }
+
+    private suspend fun buildRootChildren(): List<MediaItem> {
+        val items = mutableListOf<MediaItem>()
+        val playlists: List<Playlist> = database.playlistDao().getAllPlaylists().first()
+        for (playlist in playlists) {
+            items.add(
+                MediaItem.Builder()
+                    .setMediaId("playlist:${playlist.id}")
+                    .setMediaMetadata(
+                        MediaMetadata.Builder()
+                            .setTitle(playlist.name)
+                            .setIsBrowsable(true)
+                            .setIsPlayable(false)
+                            .setMediaType(MediaMetadata.MEDIA_TYPE_FOLDER_PLAYLISTS)
+                            .build()
+                    )
+                    .build()
+            )
+        }
+        val unsorted = stationDao.getUnsortedStations().first()
+        if (unsorted.isNotEmpty()) {
+            items.add(
+                MediaItem.Builder()
+                    .setMediaId("unsorted")
+                    .setMediaMetadata(
+                        MediaMetadata.Builder()
+                            .setTitle("Unsorted")
+                            .setIsBrowsable(true)
+                            .setIsPlayable(false)
+                            .setMediaType(MediaMetadata.MEDIA_TYPE_FOLDER_PLAYLISTS)
+                            .build()
+                    )
+                    .build()
+            )
+        }
+        return items
+    }
+
+    private suspend fun buildPlaylistStations(playlistId: Long): List<MediaItem> {
+        return stationDao.getStationsByPlaylist(playlistId).first().map { it.toMediaItem() }
+    }
+
+    private suspend fun buildUnsortedStations(): List<MediaItem> {
+        return stationDao.getUnsortedStations().first().map { it.toMediaItem() }
+    }
+
+    private fun Station.toMediaItem(): MediaItem {
+        return MediaItem.Builder()
+            .setMediaId("station:${id}")
+            .setMediaMetadata(
+                MediaMetadata.Builder()
+                    .setTitle(name)
+                    .setArtworkUri(defaultArtworkUrl?.let { android.net.Uri.parse(it) })
+                    .setIsPlayable(true)
+                    .setIsBrowsable(false)
+                    .setMediaType(MediaMetadata.MEDIA_TYPE_MUSIC)
+                    .build()
+            )
+            .build()
     }
 
     private suspend fun startEngine(station: Station, urls: List<String>) {
@@ -284,7 +479,7 @@ class RadioPlaybackService : LifecycleService() {
                         sessionStartedAt = sessionStartedAt
                     )
                 )
-                updateNotification(station, null, isReconnecting = false)
+                playerAdapter?.updatePlaybackState(PlaybackState.Connecting(station = station))
 
                 val bufferMs = app.preferences.bufferMs.first()
                 engine = AudioEngine(url, bufferMs)
@@ -328,7 +523,7 @@ class RadioPlaybackService : LifecycleService() {
                                 connectionStartedAt = connectionStartedAt
                             )
                         )
-                        updateNotification(station, null, false)
+                        playerAdapter?.updatePlaybackState(PlaybackState.Playing(station = station))
                         controller.updateLatency(engine!!.estimatedLatencyMs)
                     }
                     is AudioEngineEvent.MetadataChanged -> {
@@ -337,7 +532,16 @@ class RadioPlaybackService : LifecycleService() {
                         if (playingState is PlaybackState.Playing) {
                             transition(playingState.copy(metadata = event.metadata))
                         }
-                        updateNotification(station, event.metadata, false)
+                        serviceScope.launch {
+                            val artUrl = app.albumArtResolver.resolve(
+                                artist = event.metadata.artist,
+                                title = event.metadata.title,
+                                icyStreamUrl = event.metadata.streamUrl,
+                                stationArtworkUrl = station.defaultArtworkUrl
+                            )
+                            val artUri = artUrl?.let { android.net.Uri.parse(it) }
+                            playerAdapter?.updateMetadata(station, event.metadata, artUri)
+                        }
                         persistMetadataSnapshot(station.id, event.metadata)
                     }
                     is AudioEngineEvent.StreamInfoReceived -> {
@@ -395,7 +599,7 @@ class RadioPlaybackService : LifecycleService() {
                         attempt = attempt
                     )
                 )
-                updateNotification(station, currentMetadata, isReconnecting = true)
+                playerAdapter?.updatePlaybackState(PlaybackState.Reconnecting(station = station, metadata = currentMetadata, sessionStartedAt = sessionStartedAt, attempt = attempt))
                 val delayMs = minOf(1000L * (1 shl (attempt - 1)), 30_000L)
                 val chunk = 500L
                 var remaining = delayMs
@@ -439,29 +643,6 @@ class RadioPlaybackService : LifecycleService() {
         }
     }
 
-    private fun startForegroundWithPlaceholder(station: Station) {
-        updateNotification(station, null, isReconnecting = false)
-    }
-
-    private fun updateNotification(station: Station, metadata: IcyMetadata?, isReconnecting: Boolean, isPaused: Boolean = false) {
-        val session = mediaSession ?: return
-        val stopIntent = Intent(this, RadioPlaybackService::class.java).apply {
-            action = ACTION_STOP
-        }
-        val stopPendingIntent = PendingIntent.getService(
-            this, 0, stopIntent,
-            PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
-        )
-        val notification = notificationHelper.buildNotification(
-            station = station,
-            metadata = metadata,
-            isReconnecting = isReconnecting,
-            mediaSession = session,
-            stopPendingIntent = stopPendingIntent
-        )
-        startForeground(NotificationHelper.NOTIFICATION_ID, notification)
-    }
-
     private suspend fun persistMetadataSnapshot(stationId: Long, metadata: IcyMetadata) {
         val now = System.currentTimeMillis()
         withContext(Dispatchers.IO) {

app/src/main/java/xyz/cottongin/radio247/service/RadioPlayerAdapter.kt

@@ -1,100 +1,74 @@
 package xyz.cottongin.radio247.service
 
 import android.os.Looper
-import androidx.media3.common.BasePlayer
-import androidx.media3.common.C
 import androidx.media3.common.MediaItem
 import androidx.media3.common.MediaMetadata
-import androidx.media3.common.PlaybackParameters
 import androidx.media3.common.Player
-import androidx.media3.common.Timeline
+import androidx.media3.common.SimpleBasePlayer
+import com.google.common.util.concurrent.Futures
+import com.google.common.util.concurrent.ListenableFuture
 import xyz.cottongin.radio247.audio.IcyMetadata
 import xyz.cottongin.radio247.data.model.Station
 
 class RadioPlayerAdapter(
     private val onPlay: () -> Unit,
     private val onStop: () -> Unit,
-) : BasePlayer() {
+) : SimpleBasePlayer(Looper.getMainLooper()) {
 
-    private val listeners = mutableListOf<Player.Listener>()
+    @Volatile
     private var _playbackState: Int = Player.STATE_IDLE
+
+    @Volatile
     private var _playWhenReady: Boolean = false
+
+    @Volatile
     private var _mediaMetadata: MediaMetadata = MediaMetadata.EMPTY
+
+    @Volatile
     private var _currentMediaItem: MediaItem? = null
 
-    override fun getApplicationLooper(): Looper = Looper.getMainLooper()
+    private val commands = Player.Commands.Builder()
+        .add(Player.COMMAND_PLAY_PAUSE)
+        .add(Player.COMMAND_STOP)
+        .add(Player.COMMAND_GET_CURRENT_MEDIA_ITEM)
+        .add(Player.COMMAND_GET_MEDIA_ITEMS_METADATA)
+        .build()
 
-    override fun addListener(listener: Player.Listener) {
+    override fun getState(): SimpleBasePlayer.State {
-        listeners.add(listener)
+        val mediaItem = _currentMediaItem
-    }
+        val playlist = if (mediaItem != null) {
+            listOf(getPlaceholderMediaItemData(mediaItem))
+        } else {
+            emptyList()
+        }
 
-    override fun removeListener(listener: Player.Listener) {
+        return SimpleBasePlayer.State.Builder()
-        listeners.remove(listener)
+            .setAvailableCommands(commands)
-    }
+            .setPlaybackState(_playbackState)
-
+            .setPlayWhenReady(_playWhenReady, Player.PLAY_WHEN_READY_CHANGE_REASON_USER_REQUEST)
-    override fun getAvailableCommands(): Player.Commands =
+            .setCurrentMediaItemIndex(if (mediaItem != null) 0 else 0)
-        Player.Commands.Builder()
+            .setContentPositionMs(0L)
-            .add(Player.COMMAND_PLAY_PAUSE)
+            .setIsLoading(false)
-            .add(Player.COMMAND_STOP)
+            .setPlaylist(playlist)
-            .add(Player.COMMAND_GET_CURRENT_MEDIA_ITEM)
-            .add(Player.COMMAND_GET_MEDIA_ITEMS_METADATA)
             .build()
-
-    override fun getPlaybackState(): Int = _playbackState
-    override fun getPlayWhenReady(): Boolean = _playWhenReady
-    override fun isPlaying(): Boolean = _playbackState == Player.STATE_READY && _playWhenReady
-    override fun getMediaMetadata(): MediaMetadata = _mediaMetadata
-    override fun getCurrentMediaItem(): MediaItem? = _currentMediaItem
-
-    override fun play() {
-        _playWhenReady = true
-        onPlay()
     }
 
-    override fun pause() {
+    override fun handleSetPlayWhenReady(playWhenReady: Boolean): ListenableFuture<*> {
+        _playWhenReady = playWhenReady
+        if (playWhenReady) {
+            onPlay()
+        } else {
+            onStop()
+        }
+        return Futures.immediateVoidFuture()
+    }
+
+    override fun handleStop(): ListenableFuture<*> {
         _playWhenReady = false
         onStop()
+        return Futures.immediateVoidFuture()
     }
 
-    override fun stop() {
-        _playWhenReady = false
-        onStop()
-    }
-
-    override fun prepare() {}
-
-    override fun setPlayWhenReady(playWhenReady: Boolean) {
-        if (playWhenReady) play() else pause()
-    }
-
-    override fun release() {
-        listeners.clear()
-    }
-
-    override fun getPlaybackParameters(): PlaybackParameters = PlaybackParameters.DEFAULT
-    override fun setPlaybackParameters(playbackParameters: PlaybackParameters) {}
-
-    override fun getRepeatMode(): Int = Player.REPEAT_MODE_OFF
-    override fun setRepeatMode(repeatMode: Int) {}
-
-    override fun getShuffleModeEnabled(): Boolean = false
-    override fun setShuffleModeEnabled(shuffleModeEnabled: Boolean) {}
-
-    override fun seekToDefaultPosition() {}
-    override fun seekToDefaultPosition(mediaItemIndex: Int) {}
-    override fun seekTo(positionMs: Long) {}
-    override fun seekTo(mediaItemIndex: Int, positionMs: Long) {}
-
-    override fun getCurrentTimeline(): Timeline = Timeline.EMPTY
-    override fun getCurrentMediaItemIndex(): Int = 0
-    override fun getContentPosition(): Long = 0
-    override fun getContentDuration(): Long = C.TIME_UNSET
-    override fun getCurrentPosition(): Long = 0
-    override fun getDuration(): Long = C.TIME_UNSET
-    override fun getBufferedPosition(): Long = 0
-    override fun getTotalBufferedDuration(): Long = 0
-    override fun isCurrentMediaItemLive(): Boolean = true
-
     fun updatePlaybackState(state: PlaybackState) {
         val (newPlayerState, newPlayWhenReady) = when (state) {
             is PlaybackState.Idle -> Player.STATE_IDLE to false
@@ -103,26 +77,9 @@ class RadioPlayerAdapter(
             is PlaybackState.Paused -> Player.STATE_READY to false
             is PlaybackState.Reconnecting -> Player.STATE_BUFFERING to true
         }
-
-        val stateChanged = newPlayerState != _playbackState
-        val playWhenReadyChanged = newPlayWhenReady != _playWhenReady
         _playbackState = newPlayerState
         _playWhenReady = newPlayWhenReady
-
+        invalidateState()
-        if (stateChanged || playWhenReadyChanged) {
-            listeners.forEach { listener ->
-                if (playWhenReadyChanged) {
-                    listener.onPlayWhenReadyChanged(
-                        newPlayWhenReady,
-                        Player.PLAY_WHEN_READY_CHANGE_REASON_USER_REQUEST
-                    )
-                }
-                if (stateChanged) {
-                    listener.onPlaybackStateChanged(newPlayerState)
-                }
-                listener.onIsPlayingChanged(isPlaying)
-            }
-        }
     }
 
     fun updateStation(station: Station) {
@@ -135,12 +92,7 @@ class RadioPlayerAdapter(
                     .build()
             )
             .build()
-        listeners.forEach {
+        invalidateState()
-            it.onMediaItemTransition(
-                _currentMediaItem,
-                Player.MEDIA_ITEM_TRANSITION_REASON_PLAYLIST_CHANGED
-            )
-        }
     }
 
     fun updateMetadata(
@@ -155,6 +107,13 @@ class RadioPlayerAdapter(
             .setArtworkUri(artworkUri)
             .setIsPlayable(true)
             .build()
-        listeners.forEach { it.onMediaMetadataChanged(_mediaMetadata) }
+        invalidateState()
+    }
+
+    fun clearState() {
+        _currentMediaItem = null
+        _mediaMetadata = MediaMetadata.EMPTY
+        _playbackState = Player.STATE_IDLE
+        _playWhenReady = false
     }
 }