如何在ExoPlayer2中显示视频字幕？

// 创建ExoPlayer实例
SimpleExoPlayer player = new SimpleExoPlayer.Builder(context).build();

// 创建字幕渲染器
DefaultRenderersFactory renderersFactory = new DefaultRenderersFactory(context);
MediaSourceFactory mediaSourceFactory = new DefaultMediaSourceFactory(context);
DefaultTrackSelector trackSelector = new DefaultTrackSelector(context);
player.setRenderersFactory(renderersFactory);
player.setMediaSourceFactory(mediaSourceFactory);
player.setTrackSelector(trackSelector);

// 加载字幕轨道
MediaItem mediaItem = new MediaItem.Builder()
        .setUri(videoUri)
        .setSubtitles(subtitlesUri, MimeTypes.APPLICATION_SUBRIP)
        .build();
player.setMediaItem(mediaItem);

// 创建TextView用于显示字幕
TextView subtitleTextView = findViewById(R.id.subtitleTextView);

// 将TextView与ExoPlayer关联
player.addTextOutput(new TextOutput() {
    @Override
    public void onCues(List<Cue> cues) {
        // 更新TextView的文本内容
        StringBuilder subtitleText = new StringBuilder();
        for (Cue cue : cues) {
            subtitleText.append(cue.text).append("\n");
        }
        subtitleTextView.setText(subtitleText.toString());
    }
});

// 准备播放器并开始播放
player.prepare();
player.play();