Exoplayer不循环的视频

Question

我在我的android应用程序中使用Exoplayer播放视频和音频文件。以循环的视频/音频根据Exoplayer developer's guide,，这是你必须做的

MediaSource mediaSource = new ExtractorMediaSource(videoUri, ...); 
// Loops the video indefinitely. 
LoopingMediaSource loopingSource = new LoopingMediaSource(mediaSource); 

什么，所以我实现它像这样在我的活动的onCreate方法

BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter(); 
    TrackSelection.Factory factory = new AdaptiveTrackSelection.Factory(bandwidthMeter); 
    TrackSelector trackSelector = new DefaultTrackSelector(factory); 

    simpleExoPlayer = ExoPlayerFactory.newSimpleInstance(this,trackSelector); 
    simpleExoPlayer.setPlayWhenReady(true); 
    simpleExoPlayerView.setPlayer(simpleExoPlayer); 

    // Measures bandwidth during playback. Can be null if not required. 
    bandwidthMeter2 = new DefaultBandwidthMeter(); 

// Produces DataSource instances through which media data is loaded. 
    dataSourceFactory = new DefaultDataSourceFactory(this, 
     Util.getUserAgent(this, applicationName), bandwidthMeter2); 

// Produces Extractor instances for parsing the media data. 
    extractorsFactory = new DefaultExtractorsFactory(); 
    mediaSource = new ExtractorMediaSource(videoUri,dataSourceFactory, extractorsFactory, null, null); 

    loopingSource = new LoopingMediaSource(mediaSource); 
    simpleExoPlayer.prepare(mediaSource); 

但我的视频文件的循环没有发生。它只玩一次。

Answer 1

我发现Exoplayer开发人员指南中留有一些至关重要的信息。在创建LoopingMediaSource实例后，不应该调用simpleExoPlayer.prepare(mediaSource);，而应该调用simpleExoPlayer.prepare(loopingSource);。以下是完整代码

 BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter(); 
    TrackSelection.Factory factory = new AdaptiveTrackSelection.Factory(bandwidthMeter); 
    TrackSelector trackSelector = new DefaultTrackSelector(factory); 

    simpleExoPlayer = ExoPlayerFactory.newSimpleInstance(this,trackSelector); 
    simpleExoPlayer.setPlayWhenReady(true); 
    simpleExoPlayerView.setPlayer(simpleExoPlayer); 

    // Measures bandwidth during playback. Can be null if not required. 
    bandwidthMeter2 = new DefaultBandwidthMeter(); 

// Produces DataSource instances through which media data is loaded. 
    dataSourceFactory = new DefaultDataSourceFactory(this, 
     Util.getUserAgent(this, applicationName), bandwidthMeter2); 

// Produces Extractor instances for parsing the media data. 
    extractorsFactory = new DefaultExtractorsFactory(); 

     MediaSource mediaSource = new ExtractorMediaSource(videoUri,dataSourceFactory, extractorsFactory, null, null); 
    // Loops the video indefinitely. 
    LoopingMediaSource loopingSource = new LoopingMediaSource(mediaSource); 

    simpleExoPlayer.prepare(loopingSource);