playlist autoplay in background mode

app/src/main/java/com/github/libretube/dialogs/PlaylistOptionsDialog.kt

@@ -1,7 +1,6 @@
 package com.github.libretube.dialogs
 
 import android.app.Dialog
-import android.content.Context
 import android.os.Bundle
 import android.util.Log
 import android.widget.ArrayAdapter
@@ -10,11 +9,14 @@ import androidx.fragment.app.DialogFragment
 import com.github.libretube.R
 import com.github.libretube.obj.PlaylistId
 import com.github.libretube.preferences.PreferenceHelper
+import com.github.libretube.util.BackgroundHelper
 import com.github.libretube.util.RetrofitInstance
+import com.github.libretube.util.toID
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import retrofit2.HttpException
 import java.io.IOException
 
@@ -27,6 +29,7 @@ class PlaylistOptionsDialog(
     override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
         // options for the dialog
         var optionsList = listOf(
+            context?.getString(R.string.playOnBackground),
             context?.getString(R.string.clonePlaylist),
             context?.getString(R.string.share)
         )
@@ -49,6 +52,18 @@ class PlaylistOptionsDialog(
                 )
             ) { _, which ->
                 when (optionsList[which]) {
+                    // play the playlist in the background
+                    context?.getString(R.string.playOnBackground) -> {
+                        runBlocking {
+                            val playlist = if (isOwner) RetrofitInstance.authApi.getPlaylist(playlistId)
+                            else RetrofitInstance.api.getPlaylist(playlistId)
+                            BackgroundHelper.playOnBackground(
+                                context = requireContext(),
+                                videoId = playlist.relatedStreams!![0].url.toID(),
+                                playlistId = playlistId
+                            )
+                        }
+                    }
                     // Clone the playlist to the users Piped account
                     context?.getString(R.string.clonePlaylist) -> {
                         val token = PreferenceHelper.getToken()

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

@@ -112,11 +112,11 @@ class BackgroundMode : Service() {
         try {
             // get the intent arguments
             videoId = intent?.getStringExtra("videoId")!!
-            playlistId = intent.getStringExtra(playlistId)
+            playlistId = intent.getStringExtra("playlistId")
             val position = intent.getLongExtra("position", 0L)
 
             // initialize the playlist autoPlay Helper
-            autoPlayHelper = AutoPlayHelper(playlistId!!)
+            if (playlistId != null) autoPlayHelper = AutoPlayHelper(playlistId!!)
 
             // play the audio in the background
             playAudio(videoId, position)
@@ -159,6 +159,8 @@ class BackgroundMode : Service() {
             if (seekToPosition != 0L) player?.seekTo(seekToPosition)
 
             fetchSponsorBlockSegments()
+
+            setNextStream()
         }
     }
 
@@ -216,7 +218,7 @@ class BackgroundMode : Service() {
      * Plays the first related video to the current (used when the playback of the current video ended)
      */
     private fun playNextVideo() {
-        if (nextStreamId == videoId || !this::nextStreamId.isInitialized) return
+        if (!this::nextStreamId.isInitialized || nextStreamId == videoId) return
 
         // play new video on background
         this.videoId = nextStreamId