exoplayer2音轨切换MappedTrackInfo.getTrackGroups(int)' on a null object reference

[雕·不懒惰]

 private void initializePlayer() {
        trackSelector = new DefaultTrackSelector();
        MappingTrackSelector.MappedTrackInfo trackInfo = trackSelector.getCurrentMappedTrackInfo();
        if (trackInfo == null)
            return;

        DefaultTrackSelector.Parameters parameters = trackSelector.getParameters().buildUpon()
                .setSelectionOverride(1, trackInfo.getTrackGroups(1),
                        new DefaultTrackSelector.SelectionOverride(1, 1))
                .build();
        trackSelector.setParameters(parameters);

        player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
        playerView.setPlayer(player);
        player.setPlayWhenReady(true);
        player.seekTo(currentWindow, playbackPosition);
        DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this,
                Util.getUserAgent(this, "ExoPlayer"));
        Uri uri = Uri.parse(Environment.getExternalStorageDirectory() + "/Movies/3dall.mp4");
        MediaSource videoSource = new ExtractorMediaSource.Factory(dataSourceFactory)
                .createMediaSource(uri);
        player.prepare(videoSource);
    }

第一次用ExoPlayer
实现视频的语言切换，trackInfo 一直是null
new DefaultTrackSelector.SelectionOverride(int groupIndex, int... tracks)中的参数一直没搞明白是什么
第一个是语言索引？第二个是什么

[不会写代码的猴子]

你这里不需要设置那么多吧

trackSelector = new DefaultTrackSelector();
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);

就这样就行了

[雕·不懒惰]

解决了，播放之后延时获取

[雕·不懒惰]

引用 1 楼 不会写代码的猴子 的回复:

你这里不需要设置那么多吧

trackSelector = new DefaultTrackSelector();
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);

就这样就行了

要设置那么多的，因为要改变音轨 播放之后延时获取就可以了