Exoplayer：将单个视频播放到两个播放器视图中

Question

我想将单个视频播放到两个播放器视图中，这意味着播放器只有一个实例。与此样本（Mulit-layer player）类似。在我目前的实现中，两个视频无法同时播放，一个正在播放，而另一个则显示黑屏。如何解决或实施？请分享任何想法。

BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
    TrackSelection.Factory videoTrackSelectionFactory =
            new AdaptiveTrackSelection.Factory(bandwidthMeter);
    TrackSelector trackSelector =
            new DefaultTrackSelector(videoTrackSelectionFactory);
    player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
    backgroundPlayerView.setPlayer(player); //behind playerview

    playerView.setPlayer(player); //front playerview

    DataSource.Factory dataSourceFactory =
            new DefaultDataSourceFactory(this, Util.getUserAgent(this, "Player"));
    ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
    MediaSource mediaSource = new ExtractorMediaSource(Uri.parse("https://storage.googleapis.com/exoplayer-test-media-1/mkv/android-screens-lavf-56.36.100-aac-avc-main-1280x720.mkv"),
            dataSourceFactory, extractorsFactory, null, null);

    player.prepare(mediaSource);