如何在exoplayer中监控播放位置

Question

我正在努力寻找一种方法来创建一个线程来监控Exoplayer应用中的playbackPosition。

在下面的代码中，我需要一个简单的任务，就是在每1000ms后通过覆盖 onIsPlayingChanged 函数。但我理解这种情况只发生一次，如果应用程序状态发生变化，然而，为了使这种情况持续发生，我认为我应该创建一个线程。请告诉我如何才能实现这一点。如你所见，注释的代码是我试过的，但肯定不对。

private class PlaybackStateListener implements Player.EventListener{

    @Override
    public void onIsPlayingChanged(boolean isPlaying) {
     //TODO: Add handler to poll the playback position continuously.
      /* if(isPlaying){
        HandlerCompat.
                postDelayed(new Runnable() {
                  @Override
                  public void run() {
                    long positionParam = playbackPosition;
                  }
                });
        }*/

      if (isPlaying) {
        Log.d(TAG, "Playing position is " + playbackPosition);
      } else {
        // Not playing because playback is paused, ended, suppressed, or the player
        // is buffering, stopped or failed. Check player.getPlaybackState,
        // player.getPlayWhenReady, player.getPlaybackError and
        // player.getPlaybackSuppressionReason for details.
      }
    }

Answer 1

下面这段代码可以用来解决这样的问题，使用处理程序postDelayed方法。

final Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//My code
}
handler.postDelayed(new Runnable() {
@Override
    public void run() {
    playbackPosition = player.getCurrentPosition();
    send(playbackPosition);   //Function to update position
    handler.postDelayed(this, 1000); //1000ms frequency of updates.
    }
}, 1000);
}