fix(android) Use startForegroundService and do not delete the notific…

…ation channel until onDestroy (#4105)

See https://developer.android.com/develop/background-work/services/foreground-services\#fgs-prerequisites
    See rationale here https://stackoverflow.com/questions/45525214/are-there-any-benefits-to-using-context-startforegroundserviceintent-instead-o
    Deleting the notification channel while the foreground service is still running is not permitted.

android/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -975,7 +975,11 @@ public void onNullBinding(ComponentName name) {
         Intent intent = new Intent(themedReactContext, VideoPlaybackService.class);
         intent.setAction(MediaSessionService.SERVICE_INTERFACE);
 
-        themedReactContext.startService(intent);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            themedReactContext.startForegroundService(intent);
+        } else {
+            themedReactContext.startService(intent);
+        }
 
         int flags;
         if (Build.VERSION.SDK_INT >= 29) {

android/src/main/java/com/brentvatne/exoplayer/VideoPlaybackService.kt

@@ -63,6 +63,7 @@ class VideoPlaybackService : MediaSessionService() {
 
         mediaSessionsList[player] = mediaSession
         addSession(mediaSession)
+        startForeground(mediaSession.player.hashCode(), buildNotification(mediaSession))
     }
 
     fun unregisterPlayer(player: ExoPlayer) {
@@ -95,6 +96,10 @@ class VideoPlaybackService : MediaSessionService() {
 
     override fun onDestroy() {
         cleanup()
+        val notificationManager: NotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            notificationManager.deleteNotificationChannel(NOTIFICATION_CHANEL_ID)
+        }
         super.onDestroy()
     }
 
@@ -209,9 +214,6 @@ class VideoPlaybackService : MediaSessionService() {
     private fun hideAllNotifications() {
         val notificationManager: NotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
         notificationManager.cancelAll()
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            notificationManager.deleteNotificationChannel(NOTIFICATION_CHANEL_ID)
-        }
     }
 
     private fun cleanup() {