Unable to customize media3 notification as per the tutorial

Version

Media3 main branch

More version details

Following the tutorial

I am trying to customize the media3 notifiction controller.
And the tutorial does not work for me.

The "Save to favorites (heart icon)" does not show up the media3 notification.

Devices that reproduce the issue

Pixel 9A

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

Not tested

Reproduction steps

The code is taken from the official documentation

public class PlaybackService extends MediaSessionService {
  private static final SessionCommand CUSTOM_COMMAND_FAVORITES =
      new SessionCommand("ACTION_FAVORITES", Bundle.EMPTY);
  @Nullable private MediaSession mediaSession;

  public void onCreate() {
    super.onCreate();
    CommandButton favoriteButton =
        new CommandButton.Builder(CommandButton.ICON_HEART_UNFILLED)
            .setDisplayName("Save to favorites")
            .setSessionCommand(CUSTOM_COMMAND_FAVORITES)
            .build();
    Player player = new ExoPlayer.Builder(this).build();
    // Build the session with a custom layout.
    mediaSession =
        new MediaSession.Builder(this, player)
            .setCallback(new MyCallback())
            .setMediaButtonPreferences(ImmutableList.of(favoriteButton))
            .build();
  }

  private static class MyCallback implements MediaSession.Callback {
    @Override
    public ConnectionResult onConnect(
        MediaSession session, MediaSession.ControllerInfo controller) {
      // Set available player and session commands.
      return new AcceptedResultBuilder(session)
          .setAvailableSessionCommands(
              ConnectionResult.DEFAULT_SESSION_COMMANDS.buildUpon()
                .add(CUSTOM_COMMAND_FAVORITES)
                .build())
          .build();
    }

    public ListenableFuture onCustomCommand(
        MediaSession session,
        MediaSession.ControllerInfo controller,
        SessionCommand customCommand,
        Bundle args) {
      if (customCommand.customAction.equals(CUSTOM_COMMAND_FAVORITES.customAction)) {
        // Do custom logic here
        saveToFavorites(session.getPlayer().getCurrentMediaItem());
        return Futures.immediateFuture(new SessionResult(SessionResult.RESULT_SUCCESS));
      }
      return MediaSession.Callback.super.onCustomCommand(
          session, controller, customCommand, args);
    }
  }
}

Note, I cannot test in the demo app as

./gradlew :demo:installNoDecoderExtensionsDebug

fails due to missing ./gradlew and

gradle init

fails with

> Plugin with id 'com.android.application' not found.

Expected result

Heart icon should show in the media3 notification

Actual result

Heart icon does not show in the media3 notification

Media

Any media file works

Bug Report

• You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.