use proper way

app/src/main/java/com/github/libretube/services/BackgroundMode.kt

@@ -9,7 +9,6 @@ import android.os.Build
 import android.os.Handler
 import android.os.IBinder
 import android.os.Looper
-import android.support.v4.media.session.MediaSessionCompat
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.github.libretube.BACKGROUND_CHANNEL_ID
 import com.github.libretube.PLAYER_NOTIFICATION_ID
@@ -54,16 +53,6 @@ class BackgroundMode : Service() {
     private var player: ExoPlayer? = null
     private var playWhenReadyPlayer = true
 
-    /**
-     * The [MediaSessionCompat] for the [response].
-     */
-    private lateinit var mediaSession: MediaSessionCompat
-
-    /**
-     * The [MediaSessionConnector] to connect with the [mediaSession] and implement it with the [player].
-     */
-    private lateinit var mediaSessionConnector: MediaSessionConnector
-
     /**
      * The [AudioAttributes] handle the audio focus of the [player]
      */
@@ -104,12 +93,17 @@ class BackgroundMode : Service() {
      * Initializes the [player] with the [MediaItem].
      */
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        try {
             // get the intent arguments
             videoId = intent?.getStringExtra("videoId")!!
             val position = intent.getLongExtra("position", 0L)
 
             // play the audio in the background
             playAudio(videoId, position)
+        } catch (e: Exception) {
+            stopForeground(true)
+            stopSelf()
+        }
         return super.onStartCommand(intent, flags, startId)
     }
 
@@ -131,8 +125,10 @@ class BackgroundMode : Service() {
             setMediaItem()
 
             // create the notification
+            if (!this@BackgroundMode::nowPlayingNotification.isInitialized) {
                 nowPlayingNotification = NowPlayingNotification(this@BackgroundMode, player!!)
-            nowPlayingNotification.initializePlayerNotification(mediaSession, response!!)
+            }
+            nowPlayingNotification.updatePlayerNotification(response!!)
 
             player?.apply {
                 playWhenReady = playWhenReadyPlayer
@@ -208,12 +204,6 @@ class BackgroundMode : Service() {
             val mediaItem = MediaItem.Builder().setUri(it.hls!!).build()
             player?.setMediaItem(mediaItem)
         }
-
-        mediaSession = MediaSessionCompat(this, this.javaClass.name)
-        mediaSession.isActive = true
-
-        mediaSessionConnector = MediaSessionConnector(mediaSession)
-        mediaSessionConnector.setPlayer(player)
     }
 
     /**

app/src/main/java/com/github/libretube/util/NowPlayingNotification.kt

@@ -12,6 +12,7 @@ import com.github.libretube.activities.MainActivity
 import com.github.libretube.obj.Streams
 import com.google.android.exoplayer2.ExoPlayer
 import com.google.android.exoplayer2.Player
+import com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector
 import com.google.android.exoplayer2.ui.PlayerNotificationManager
 import java.net.URL
 
@@ -21,15 +22,21 @@ class NowPlayingNotification(
 ) {
     private var streams: Streams? = null
 
+    /**
+     * The [MediaSessionCompat] for the [streams].
+     */
+    private lateinit var mediaSession: MediaSessionCompat
+
+    /**
+     * The [MediaSessionConnector] to connect with the [mediaSession] and implement it with the [player].
+     */
+    private lateinit var mediaSessionConnector: MediaSessionConnector
+
     /**
      * The [PlayerNotificationManager] to load the [mediaSession] content on it.
      */
     private var playerNotification: PlayerNotificationManager? = null
 
-    private fun setStreams(streams: Streams) {
-        this.streams = streams
-    }
-
     /**
      * The [DescriptionAdapter] is used to show title, uploaderName and thumbnail of the video in the notification
      * Basic example [here](https://github.com/AnthonyMarkD/AudioPlayerSampleTest)
@@ -109,14 +116,29 @@ class NowPlayingNotification(
         }
     }
 
+    private fun createMediaSession() {
+        if (this::mediaSession.isInitialized) return
+        mediaSession = MediaSessionCompat(context, this.javaClass.name)
+        mediaSession.isActive = true
+
+        mediaSessionConnector = MediaSessionConnector(mediaSession)
+        mediaSessionConnector.setPlayer(player)
+    }
+
     /**
      * Initializes the [playerNotification] attached to the [player] and shows it.
      */
-    fun initializePlayerNotification(
+    fun updatePlayerNotification(
-        mediaSession: MediaSessionCompat,
         streams: Streams
     ) {
         this.streams = streams
+        if (playerNotification == null) {
+            createMediaSession()
+            createNotification()
+        }
+    }
+
+    private fun createNotification() {
         playerNotification = PlayerNotificationManager
             .Builder(context, PLAYER_NOTIFICATION_ID, BACKGROUND_CHANNEL_ID)
             // set the description of the notification