videoView內的Android手勢檢測器片段

Question

我有一個videoView中的片段，我需要檢測它的手勢。我嘗試用下面的代碼沒有成功。我如何正確實現這一點？需要幫助。提前致謝。

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); 
    } 

} 

當我觸摸我的VideView只響應它的控制（播放，暫停......），但姿態探測器從未打過電話也許這些控件擾亂我的手勢檢測器？

觸摸時會調用onDown事件，但永遠不會觸發onFling。是否有可能通過onDown事件實現onFling函數？

Answer 1

我不知道爲什麼，但添加onDown方法我CustomeGestureDetector使得onFling方法被調用。

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

對於機器人以簡單的方式使用GestureDetector創建延伸SimpleOnGestureListner一個監聽類，然後重寫onScroll和onFling方法。我認爲這些應該是用戶在除了onTouch以外的視頻中遇到的唯一手勢。

源代碼示例：

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; 
    } 
    }