我已经实现了exoplayer通知管理器，并希望检测播放或暂停动作，以便我可以相应地更新用户界面
我试过这个代码
'

player.addListener(new Player.DefaultEventListener() {
  @Override
  public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
    if (playWhenReady && playbackState == Player.STATE_READY) {
      // media actually playing
    } else if (playWhenReady) {
      // might be idle (plays after prepare()), 
      // buffering (plays when data available) 
      // or ended (plays when seek away from end)
    } else {
      // player paused in any state
    }
  }
});

'
我从这里得到的-https://stackoverflow.com/a/48067205/13312583
但是它不起作用，这件事有什么方法吗？