Question

我想为我的视图实现一个监听器。我想检测一个简单的点击双击和长按，这就是全部。这是我写的代码（仅限相关部分）：

public class BoardView extends View implements OnGestureListener, OnDoubleTapListener{

    //My functions and code. 

@Override 
public boolean onTouchEvent(MotionEvent event){ 
    Toast t = Toast.makeText(this.getContext(), "I'm touched", Toast.LENGTH_SHORT);
    t.show();
    System.err.println("On Touch");
    return super.onTouchEvent(event);
}

public void onLongPress(MotionEvent event) {
    Toast t = Toast.makeText(this.getContext(), "I get it, stop touching me!!!", Toast.LENGTH_SHORT);
    t.show();       
    System.err.println("Long Press");
    //Log.d(DEBUG_TAG, "onLongPress: " + event.toString()); 
}

@Override
public void onGesture(GestureOverlayView overlay, MotionEvent event) {

}

@Override
public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) {

}

@Override
public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {


}

@Override
public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) {
    // TODO Auto-generated method stub

}

@Override
public boolean onDoubleTapEvent(MotionEvent e) {
    return false;
}

@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
    // TODO Auto-generated method stub
    return false;
}

@Override
public boolean onDoubleTap(MotionEvent e) {
    Toast t = Toast.makeText(this.getContext(), "Soy double the joy", Toast.LENGTH_SHORT);
    t.show();
    System.err.println("Double Tap");
    return true;
}
}

我完全检测到触摸但不是双击或长按......我做错了什么？

编辑：根据其中一个答案，我写了以下代码：

private class Gestures extends SimpleOnGestureListener{

    public Gestures(){          
    }

    public void onTouchEvent(MotionEvent event){
        System.err.println("Touch Even gestures");
    }
     @Override
        public void onLongPress(MotionEvent event) {
            System.err.println("Long Press");
        }

     @Override
        public boolean onDoubleTap(MotionEvent event) {
         System.err.println("Double Tap");
            return true;
        }

}

Gestures gdetector = new Gestures();

这是在我的BoardView构造函数之前。然后据我所知，我应该做的：

@Override 
public boolean onTouchEvent(MotionEvent event){     
gdetector.onTouchEvent(event);
    return super.onTouchEvent(event);
}

但是我只检测到了简单的触摸......

Answer 1

不是编写自定义视图，而是查看View.setOnLongClickListener（）和View.setOnClickListener（）。

http://developer.android.com/reference/android/view/View.html

LongClickListener绝对是您想要长时间点击的内容，而对于某些状态跟踪变量，正常的onClickListener可以处理双击。

Answer 2

您只需在视图的某个内部类中扩展GestureDetector.SimpleOnGestureListener并覆盖您想要的方法（双击，长按等），您就可以使用包含此侦听器的手势检测器来处理这些手势。

示例视图可能如下所示：

public class GestureView extends View
{
    private GestureDetector mGestureDetector;

    //only one constructor for shorter code, in final code all should be presented
    public GestureView(Context context, AttributeSet attrs)
    {
        super(context, attrs);

        final MyGestureListener myGestureListener = new MyGestureListener();
        mGestureDetector = new GestureDetector(context, myGestureListener);
        mGestureDetector.setOnDoubleTapListener(myGestureListener);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        return mGestureDetector.onTouchEvent(event) || super.onTouchEvent(event);
    }

    private class MyGestureListener extends GestureDetector.SimpleOnGestureListener
    {
        @Override
        public boolean onDown(MotionEvent event)
        {
            return true;
        }

        @Override
        public void onLongPress(MotionEvent e)
        {
            //your code here
        }

        @Override
        public boolean onDoubleTap(MotionEvent e)
        {
            //your code here return true if event handled
            return super.onDoubleTap(e);
        }

        //this can be taken as click
        @Override
        public boolean onSingleTapConfirmed(MotionEvent e)
        {
            //your code here return true if event handled
            return super.onSingleTapConfirmed(e);
        }
    }
}

如果您只想将手势检测器添加到其他视图中，您只需从onTouchListener调用其onTouch方法，如

view.setOnTouchListener(new View.OnTouchListener()
{
    @Override
    public boolean onTouch(View v, MotionEvent event)
    {
        return gestureDetector.onTouchEvent(event);
    }
});

无法在自定义视图上实现OnGestureListere

2 个答案: