videoView内的Android手势检测器片段

Question

我有一个videoView中的片段，我需要检测它的手势。我尝试用下面的代码没有成功。我如何正确实现这一点？需要帮助。提前致谢。

CustomVideoView.java

public class CustomVideoView extends VideoView { 

private GestureDetector gestureDetector; 


public CustomVideoView(Context context) { 
    super(context); 
} 


public CustomVideoView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
} 


public CustomVideoView(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
} 


@Override 
protected void onScrollChanged(int l, int t, int oldl, int oldt) { 
    super.onScrollChanged(l, t, oldl, oldt); 
} 


@Override 
public boolean onTouchEvent(MotionEvent ev) { 
    return gestureDetector.onTouchEvent(ev) || super.onTouchEvent(ev); 
} 

public void setGestureDetector(GestureDetector gestureDetector) { 
    this.gestureDetector = gestureDetector; 
} 
} 

MyFragment.java

public class MyFragment extends Fragment{ 

private Context context; 
private CustomVideoView videoView; 


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

    context = getActivity(); 

    View tmp_view = inflater.inflate(R.layout.my_fragment, container, false); 
    assert tmp_view != null; 

    videoView = (CustomVideoView) tmp_view.findViewById(R.id.videoView); 

    MediaController mc = new MediaController(context); 
    mc.setAnchorView(videoView); 
    mc.setMediaPlayer(videoView); 

    Uri video = Uri.parse("myUrl"); 
    videoView.setMediaController(mc); 
    videoView.setVideoURI(video); 
    videoView.requestFocus(); 
    videoView.start(); 

    videoView.setGestureDetector(new GestureDetector(new CustomeGestureDetector())); 

    return tmp_view; 

} 

private class CustomeGestureDetector extends GestureDetector.SimpleOnGestureListener { 
    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 

     //NEVER CALLED 
     if(e1 == null || e2 == null) return false; 
     if(e1.getPointerCount() > 1 || e2.getPointerCount() > 1) return false; 
     else { 
      try { // right to left swipe .. go to next page 
       if(e1.getX() - e2.getX() > 100 && Math.abs(velocityX) > 800) { 
        //do your stuff 

        Log.i("MyApp", "right to left"); 
        return true; 
       } //left to right swipe .. go to prev page 
       else if (e2.getX() - e1.getX() > 100 && Math.abs(velocityX) > 800) { 
        //do your stuff 

        Log.i("MyApp", "left to right"); 
        return true; 
       } //bottom to top, go to next document 
       else if(e1.getY() - e2.getY() > 100 && Math.abs(velocityY) > 800 
         && videoView.getScrollY() >= videoView.getHeight()) { 
        //do your stuff 
        return true; 
       } //top to bottom, go to prev document 
       else if (e2.getY() - e1.getY() > 100 && Math.abs(velocityY) > 800) { 
        //do your stuff 
        return true; 
       } 
      } catch (Exception e) { // nothing 
      } 
      return false; 
     } 
    } 

    @Override 
    public boolean onDown(MotionEvent event) { 
     Log.i("MyApp", "onDown"); 
     //THIS IS CALLED WHEN TOUCH 
     return super.onDown(event); 
    } 

} 

当我触摸我的VideView只响应它的控制（播放，暂停......），但姿态探测器从未打过电话也许这些控件扰乱我的手势检测器？

触摸时会调用onDown事件，但永远不会触发onFling。是否有可能通过onDown事件实现onFling函数？

Answer 1

我不知道为什么，但添加onDown方法我CustomeGestureDetector使得onFling方法被调用。

private class CustomeGestureDetector extends GestureDetector.SimpleOnGestureListener { 
    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 

    if(e1 == null || e2 == null) return false; 
    if(e1.getPointerCount() > 1 || e2.getPointerCount() > 1) return false; 
    else { 
     try { // right to left swipe .. go to next page 
      if(e1.getX() - e2.getX() > 100 && Math.abs(velocityX) > 800) { 
       //do your stuff 

       Log.i("MyApp", "right to left"); 
       return true; 
      } //left to right swipe .. go to prev page 
      else if (e2.getX() - e1.getX() > 100 && Math.abs(velocityX) > 800) { 
       //do your stuff 

       Log.i("MyApp", "left to right"); 
       return true; 
      } //bottom to top, go to next document 
      else if(e1.getY() - e2.getY() > 100 && Math.abs(velocityY) > 800 
        && videoView.getScrollY() >= videoView.getHeight()) { 
       //do your stuff 
       return true; 
      } //top to bottom, go to prev document 
      else if (e2.getY() - e1.getY() > 100 && Math.abs(velocityY) > 800) { 
       //do your stuff 
       return true; 
      } 
     } catch (Exception e) { // nothing 
     } 

     return false; 
     } 
    } 

    @Override 
    public boolean onDown(MotionEvent event) { 
      return true; 
    } 

} 

Answer 2

对于机器人以简单的方式使用GestureDetector创建延伸SimpleOnGestureListner一个监听类，然后重写onScroll和onFling方法。我认为这些应该是用户在除了onTouch以外的视频中遇到的唯一手势。

源代码示例：

class VideoGestureDetector extends SimpleOnGestureListener { 

    @Override 
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { 

     // implementation when the user scrolls 
     return false; 
    } 

    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 

     // implementation when the user flings 
     return false; 
    } 
    }