Question

我正在尝试在片段内的Button上添加onTouchListner。此代码在主要活动中正常工作，但在片段上没有。只要按下按钮，我想要做的就是播放一定的声音文件。任何帮助将不胜感激。

代码是

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

    message1();

return inflater.inflate(R.layout.fragment_fragment_a, container, false);


}

public  void message1() {
    // TODO Auto-generated method stub


         ImageButton one1 = (ImageButton) getView().findViewById(R.id.imageButton1);


         one1.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                int resID =   R.raw.a;
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    //mp.setLooping(true);

                    if (mp != null) {
                         mp.release();
                      }
                      // Create a new MediaPlayer to play this sound
                      mp = MediaPlayer.create( getActivity(), resID);
                      mp.start();
                    break;

                case MotionEvent.ACTION_UP:

                    mp.stop();

                    break;
                }

                return true;

            }

}）;

Answer 1

致电message1()时，布局没有膨胀。因此，findViewById无法找到您的按钮，因为它在视图层次结构中不存在。

尝试以下方法：

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

    View view =  inflater.inflate(R.layout.fragment_fragment_a, container, false)
    ImageButton one1 = (ImageButton) view.findViewById(R.id.imageButton1);
    one1.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            int resID =   R.raw.a;
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                //mp.setLooping(true);

                if (mp != null) {
                     mp.release();
                  }
                  // Create a new MediaPlayer to play this sound
                  mp = MediaPlayer.create( getActivity(), resID);
                  mp.start();
                break;

            case MotionEvent.ACTION_UP:
                mp.stop();
                break;
            }
            return true;
        }
    });
    return view;


}

在Android中的片段内的Button上添加onTouchListener

1 个答案: