// [START ExoplayerWrapper.PlaybackListener region]
  @Override
  public void onStateChanged(boolean playWhenReady, int playbackState) {
    switch (playbackState) {
      case ExoPlayer.STATE_READY:
        if (playWhenReady) {
          if (mReadiness != KState.READY) {
            mReadiness = KState.READY;

            updateAdVideoTrackQuality();
            mListener.adDurationUpdate((float) mAdPlayer.getDuration() / 1000);
          }
          for (VideoAdPlayer.VideoAdPlayerCallback callback : mAdCallbacks) {
            callback.onPlay();
          }
        } else if (currentPosition > 0) {
          mAdPlayer.seek(currentPosition, true);
          isSeeking = true;
          currentPosition = 0;
        } else if (isSeeking) {
          isSeeking = false;
          mAdPlayer.play();
        } else {
          for (VideoAdPlayer.VideoAdPlayerCallback callback : mAdCallbacks) {
            callback.onPause();
          }
        }
        break;
      case ExoPlayer.STATE_ENDED:
        removeAd();
        for (VideoAdPlayer.VideoAdPlayerCallback callback : mAdCallbacks) {
          callback.onEnded();
        }
        mReadiness = KState.IDLE;
        break;
    }
  }
 public void pauseAdCallback() {
   for (VideoAdPlayer.VideoAdPlayerCallback callback : mAdCallbacks) {
     callback.onPause();
   }
 }
 @Override
 public void onError(Exception e) {
   for (VideoAdPlayer.VideoAdPlayerCallback callback : mAdCallbacks) {
     callback.onError();
   }
 }
 public void resumeAdCallback() {
   for (VideoAdPlayer.VideoAdPlayerCallback callback : mAdCallbacks) {
     callback.onResume();
   }
 }