android 触摸手势 OnGestureListener

OnGestureListener 可以处理一些简单的触摸手势，比如滑动，长按等，

OnGestureListener不能直接设置侦听的，可以设置OnTouchListener，让其指向OnGestureListener

public class GestureView extends View implements OnTouchListener, OnGestureListener
{
GestureDetector mGestureDetector;

public GestureView(Context context)
{
super(context);

this.setOnTouchListener(this);
mGestureDetector = new GestureDetector(this);
}

@Override
public boolean onDown(MotionEvent e)
{
Log.i("@fred", "触摸手势：onDown");
return true;
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
if (e2.getX() - e1.getX() > 50)
{
Log.i("@fred", "触摸手势：onFling");
}
return true;
}

@Override
public void onLongPress(MotionEvent e)
{
Log.i("@fred", "触摸手势：onLongPress");

}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
{
Log.i("@fred", "触摸手势：onScroll");
return true;
}

@Override
public void onShowPress(MotionEvent e)
{
Log.i("@fred", "触摸手势：onShowPress");
}

@Override
public boolean onSingleTapUp(MotionEvent e)
{
Log.i("@fred", "触摸手势：onSingleTapUp");
return true;
}

@Override
public boolean onTouch(View v, MotionEvent event)
{
// 将MotionEvent事件传到GestureDetector
return mGestureDetector.onTouchEvent(event);
}

}

比如点击一下屏幕：