Question

我有一个片段，并且为了与父活动进行通信（参见下一个代码块），我使用了一个接口。我包括一个基本的例子，但问题是当我从Spotify OnPlaybackEvent调用函数updateTextView（）时我的TextView没有更新活动，如果我通过点击它工作的按钮调用这个相同的函数。我尝试使用Handlers和runonuithread，但似乎没有任何效果。

这是我的片段：

public class PlayerFragment extends Fragment implements SpotifyPlayer.NotificationCallback, ConnectionStateCallback {

    public ImageView playButton;
    public TrackOperations trackOperationsCallback;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        rootView = inflater.inflate(R.layout.player_fragment, container, false);

        playButton = (ImageView) rootView.findViewById(R.id.playButton);


        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //THIS WORKS!
                trackOperationsCallback.updateTextView();
            }
        });

        return rootView;
    }

    @Override
    public void onPlaybackEvent(PlayerEvent playerEvent) {
        if(playerEvent.equals(kSpPlaybackNotifyTrackDelivered)){
           //THIS IS PRINTED WHEN A SONG ENDS
           Log.d(spoty.TAG, "Player: Event " + playerEvent);

           //BUT THIS DONT WORK
           trackOperationsCallback.updateTextView();
       }
    }

    public interface TrackOperations {
        public void updateTextView();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        try {
            trackOperationsCallback = (TrackOperations) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement TrackOperations");
        }
    }

}

这是我的父母活动：

 public class QueueActivity extends Activity implements PlayerFragment.TrackOperations {

     private TextView queueSong;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         queueSong = (TextView) findViewById(R.id.queueSong);
     }

     @Override
     public void updateTextView(){
         //THIS IS PRINTED IN BOTH CASES
         Log.d(spoty.TAG, "Called!");

         //THIS WORKS IF IS CALLED FROM THE BUTTON CLICK OF THE FRAGMENT 
         //BUT DONT WORK WHEN CALLED FROM THE EVENT IN FRAGMENT
         queueSong.setText("ANY RANDOM TEXT");
     }
}

我有几天在努力，所以任何建议都将受到高度赞赏。提前谢谢。

Answer 1

这可能不是最好的方法，但每当我遇到数据传输问题时，我都会使用SharedPreferences解决它，包括Fragment to Fragment通信。这肯定会解决您的问题

Android：无法更新片段中的活动中的TextView文本

1 个答案: