MediaSession锁定屏幕图像

Question

我正在尝试将ExoPlayer与MediaSession结合使用，以使用播放控件并在锁屏上显示专辑封面。这一切都在服务中。

控件工作正常，但专辑封面未显示为锁屏背景。它确实显示在通知中。

AudioController跟踪主应用程序UI中正在播放的曲目，与通知/锁屏无关，因此并不重要。

这里的代码只是为了测试一切是否正常，因此专辑封面是一种硬编码资源，等等。

我在这里想念什么？

@Override
public void onCreate() {
    super.onCreate();

    //Player
    TrackSelection.Factory trackSelectionFactory = new AdaptiveTrackSelection.Factory();
    player = ExoPlayerFactory.newSimpleInstance(this, new DefaultTrackSelector(trackSelectionFactory));

    // Notification manager
    playerNotificationManager = PlayerNotificationManager.createWithNotificationChannel(
            context,
            PLAYBACK_CHANNEL_ID,
            R.string.playback_channel_name,
            PLAYBACK_NOTIFICATION_ID,
            new MediaDescriptionAdapter() {
                @Override
                public String getCurrentContentTitle(Player player) {
                    return AudioController.getInstance().getCurrentTitle();
                }

                @Nullable
                @Override
                public PendingIntent createCurrentContentIntent(Player player) {
                    Intent intent = new Intent(context, AudioPlayerService.class);
                    return PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
                }

                @Nullable
                @Override
                public String getCurrentContentText(Player player) {
                    return AudioController.getInstance().getCurrentText();
                }

                @Nullable
                @Override
                public Bitmap getCurrentLargeIcon(Player player, BitmapCallback callback) {
                    return getBitmap(
                            context, R.drawable.h1);
                }
            }
    );
    playerNotificationManager.setNotificationListener(new NotificationListener() {
        @Override
        public void onNotificationStarted(int notificationId, Notification notification) {
            startForeground(notificationId, notification);
        }

        @Override
        public void onNotificationCancelled(int notificationId) {
            stopSelf();
        }
    });

    // omit skip previous and next actions
    playerNotificationManager.setUseNavigationActions(true);
    // omit fast forward action by setting the increment to zero
    playerNotificationManager.setFastForwardIncrementMs(0);
    // omit rewind action by setting the increment to zero
    playerNotificationManager.setRewindIncrementMs(0);

    playerNotificationManager.setPlayer(player);


    // Media session
    mediaSession = new MediaSessionCompat(context, "TestAudio");
    mediaSession.setActive(true);

    mediaSessionConnector = new MediaSessionConnector(mediaSession);
    mediaSessionConnector.setQueueNavigator(new TimelineQueueNavigator(mediaSession) {
        @Override
        public MediaDescriptionCompat getMediaDescription(int windowIndex) {
            return updateMediaSessionMetaData();
        }
    });
    mediaSessionConnector.setPlayer(player, null);

    PlaybackStateCompat playbackStateCompat = new PlaybackStateCompat.Builder()
            .setActions(
                    PlaybackStateCompat.ACTION_SEEK_TO |
                            PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS |
                            PlaybackStateCompat.ACTION_SKIP_TO_NEXT |
                            PlaybackStateCompat.ACTION_PLAY |
                            PlaybackStateCompat.ACTION_PAUSE |
                            PlaybackStateCompat.ACTION_STOP
            )
            .setState(
                    PlaybackStateCompat.STATE_PAUSED,
                    0,
                    1.0f)
            .build();
    mediaSession.setPlaybackState(playbackStateCompat);
    playerNotificationManager.setMediaSessionToken(mediaSession.getSessionToken());

    // Binder
    binder = new AudioBinder();

}

private MediaDescriptionCompat updateMediaSessionMetaData() {
    MediaMetadataCompat.Builder metaDataBuilder = new MediaMetadataCompat.Builder();
    Bitmap albumArtBitmap = BitmapFactory.decodeResource(getResources(),
            R.drawable.h1);
    metaDataBuilder.putBitmap(MediaMetadata.METADATA_KEY_ALBUM_ART, albumArtBitmap);
    metaDataBuilder.putBitmap(MediaMetadata.METADATA_KEY_ART, albumArtBitmap);

    mediaSession.setMetadata(metaDataBuilder.build());

    MediaDescriptionCompat description = metaDataBuilder.build().getDescription();
    return description;
}