Addressed review comments

Author: HatakeKakashri

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -229,14 +229,15 @@ public final class VideoDetailFragment
     private ContentObserver settingsContentObserver;
     @Nullable
     private PlayerService playerService;
+    @Nullable
     private Player player;
     private final PlayerHolder playerHolder = PlayerHolder.getInstance();
 
     /*//////////////////////////////////////////////////////////////////////////
     // Service management
     //////////////////////////////////////////////////////////////////////////*/
     @Override
-    public void onServiceConnected(final Player connectedPlayer,
+    public void onServiceConnected(@Nullable final Player connectedPlayer,
                                    final PlayerService connectedPlayerService,
                                    final boolean playAfterConnect) {
         player = connectedPlayer;

app/src/main/java/org/schabi/newpipe/local/dialog/PlaylistDialog.java

@@ -163,7 +163,7 @@ public static Disposable createCorrespondingDialog(
      * @return the disposable that was created
      */
     public static Disposable showForPlayQueue(
-            final Player player,
+            @NonNull final Player player,
             @NonNull final FragmentManager fragmentManager) {
 
         final List<StreamEntity> streamEntities = Stream.of(player.getPlayQueue())

app/src/main/java/org/schabi/newpipe/player/PlayQueueActivity.java

@@ -61,6 +61,7 @@ public final class PlayQueueActivity extends AppCompatActivity
 
     private static final int MENU_ID_AUDIO_TRACK = 71;
 
+    @Nullable
     private Player player;
 
     private boolean serviceBound;
@@ -137,30 +138,38 @@ public boolean onOptionsItemSelected(final MenuItem item) {
                 NavigationHelper.openSettings(this);
                 return true;
             case R.id.action_append_playlist:
-                PlaylistDialog.showForPlayQueue(player, getSupportFragmentManager());
+                if (player != null) {
+                    PlaylistDialog.showForPlayQueue(player, getSupportFragmentManager());
+                }
                 return true;
             case R.id.action_playback_speed:
                 openPlaybackParameterDialog();
                 return true;
             case R.id.action_mute:
-                player.toggleMute();
+                if (player != null) {
+                    player.toggleMute();
+                }
                 return true;
             case R.id.action_system_audio:
                 startActivity(new Intent(Settings.ACTION_SOUND_SETTINGS));
                 return true;
             case R.id.action_switch_main:
-                this.player.setRecovery();
-                NavigationHelper.playOnMainPlayer(this, player.getPlayQueue(), true);
+                if (player != null) {
+                    this.player.setRecovery();
+                    NavigationHelper.playOnMainPlayer(this, player.getPlayQueue(), true);
+                }
                 return true;
             case R.id.action_switch_popup:
-                if (PermissionHelper.isPopupEnabledElseAsk(this)) {
+                if (PermissionHelper.isPopupEnabledElseAsk(this) && player != null) {
                     this.player.setRecovery();
                     NavigationHelper.playOnPopupPlayer(this, player.getPlayQueue(), true);
                 }
                 return true;
             case R.id.action_switch_background:
-                this.player.setRecovery();
-                NavigationHelper.playOnBackgroundPlayer(this, player.getPlayQueue(), true);
+                if (player != null) {
+                    this.player.setRecovery();
+                    NavigationHelper.playOnBackgroundPlayer(this, player.getPlayQueue(), true);
+                }
                 return true;
         }
 
@@ -309,7 +318,7 @@ public void onMove(final int sourceIndex, final int targetIndex) {
 
             @Override
             public void onSwiped(final int index) {
-                if (index != -1) {
+                if (index != -1 && player != null) {
                     player.getPlayQueue().remove(index);
                 }
             }
@@ -659,7 +668,7 @@ private void buildAudioTrackMenu() {
      * @param itemId index of the selected item
      */
     private void onAudioTrackClick(final int itemId) {
-        if (player.getCurrentMetadata() == null) {
+        if (player == null || player.getCurrentMetadata() == null) {
             return;
         }
         player.getCurrentMetadata().getMaybeAudioTrack().ifPresent(audioTrack -> {

app/src/main/java/org/schabi/newpipe/player/PlayerService.kt

@@ -234,9 +234,7 @@ class PlayerService : MediaBrowserServiceCompat() {
             return playerService.get()
         }
 
-        fun getPlayer(): Player? {
-            return playerService.get()!!.player
-        }
+        fun getPlayer(): Player? = playerService.get()?.player
     }
 
     companion object {

app/src/main/java/org/schabi/newpipe/player/event/PlayerServiceExtendedEventListener.java

@@ -1,10 +1,12 @@
 package org.schabi.newpipe.player.event;
 
+import androidx.annotation.Nullable;
+
 import org.schabi.newpipe.player.PlayerService;
 import org.schabi.newpipe.player.Player;
 
 public interface PlayerServiceExtendedEventListener extends PlayerServiceEventListener {
-    void onServiceConnected(Player player,
+    void onServiceConnected(@Nullable Player player,
                             PlayerService playerService,
                             boolean playAfterConnect);
     void onServiceDisconnected();

app/src/main/java/org/schabi/newpipe/player/helper/PlayerHolder.java

@@ -166,7 +166,7 @@ public void onServiceConnected(final ComponentName compName, final IBinder servi
             }
             final PlayerService.LocalBinder localBinder = (PlayerService.LocalBinder) service;
 
-            playerService = localBinder.getService();
+            playerService = localBinder.getPlayer().getService();
             player = localBinder.getPlayer();
             if (listener != null) {
                 listener.onServiceConnected(player, playerService, playAfterConnect);

app/src/main/java/org/schabi/newpipe/player/mediabrowser/MediaBrowserConnector.kt

@@ -720,7 +720,10 @@ class MediaBrowserConnector(playerService: PlayerService) : PlaybackPreparer {
     private fun handleSearchError(throwable: Throwable) {
         Log.e(TAG, "Search error: " + throwable)
         disposePrepareOrPlayCommands()
-        playbackError(R.string.content_not_supported, PlaybackStateCompat.ERROR_CODE_NOT_SUPPORTED)
+        sessionConnector.setCustomErrorMessage(
+            playerService.getString(R.string.search_no_results),
+            PlaybackStateCompat.ERROR_CODE_APP_ERROR,
+        )
     }
 
     override fun onPrepareFromUri(