如何在使用Chromecast进行转换时将媒体内容的元数据获取到Notification？

// 在发送媒体内容之前，将元数据附加到媒体请求中
MediaMetadata mediaMetadata = new MediaMetadata.Builder()
        .putString(MediaMetadata.METADATA_KEY_TITLE, "媒体标题")
        .putString(MediaMetadata.METADATA_KEY_ARTIST, "媒体艺术家")
        .putString(MediaMetadata.METADATA_KEY_ALBUM_ART_URI, "封面图像URL")
        .build();
MediaInfo mediaInfo = new MediaInfo.Builder("媒体URL")
        .setContentType("媒体类型")
        .setStreamType(MediaInfo.STREAM_TYPE_BUFFERED)
        .setMetadata(mediaMetadata)
        .build();

// 监听媒体状态的变化
mMediaRouterCallback = new MediaRouter.Callback() {
    @Override
    public void onRouteSelected(MediaRouter router, MediaRouter.RouteInfo route) {
        // 当路由被选择时，开始播放媒体内容
        mMediaRouter = router;
        mMediaRouter.selectRoute(route);
        mRemoteMediaPlayer.load(mApiClient, mediaInfo, true)
                .setResultCallback(new ResultCallback<RemoteMediaPlayer.MediaChannelResult>() {
                    @Override
                    public void onResult(@NonNull RemoteMediaPlayer.MediaChannelResult mediaChannelResult) {
                        if (mediaChannelResult.getStatus().isSuccess()) {
                            // 媒体内容加载成功
                        } else {
                            // 媒体内容加载失败
                        }
                    }
                });
    }

    @Override
    public void onRouteUnselected(MediaRouter router, MediaRouter.RouteInfo route) {
        // 当路由被取消选择时，停止播放媒体内容
        mMediaRouter = null;
        mRemoteMediaPlayer.stop(mApiClient);
    }
};

// 获取媒体内容的元数据并显示在Notification中
mRemoteMediaPlayer.setOnMetadataUpdatedListener(new RemoteMediaPlayer.OnMetadataUpdatedListener() {
    @Override
    public void onMetadataUpdated() {
        MediaInfo mediaInfo = mRemoteMediaPlayer.getMediaInfo();
        MediaMetadata mediaMetadata = mediaInfo.getMetadata();

        // 创建一个自定义的Notification
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                .setContentTitle(mediaMetadata.getString(MediaMetadata.METADATA_KEY_TITLE))
                .setContentText(mediaMetadata.getString(MediaMetadata.METADATA_KEY_ARTIST))
                .setSmallIcon(R.drawable.notification_icon)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.notification_large_icon));

        // 发送Notification
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(notificationId, builder.build());
    }
});