OnGestureListener探索

public class MyView extends View implements OnGestureListener {
    private GestureDetector gestureDetector;

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        gestureDetector = new GestureDetector(context, this);
        gestureDetector.setIsLongpressEnabled(true);
    }

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

    // Touch down时触发
    @Override
    public boolean onDown(MotionEvent e) {
        Log.e("onDown", "onDown");
        // 这里要改成true，表示该事件已被消费掉，否则无论什么手势都是onDown-onShowPress-onLongPress
        return true;
    }

    // Touchdown后过一会没有滑动先触发onShowPress再是onLongPress
    @Override
    public void onShowPress(MotionEvent e) {
        Log.e("onShowPress", "onShowPress");
    }

    // Touch了不移动一直Touch down时触发
    @Override
    public void onLongPress(MotionEvent e) {
        Log.e("onLongPress", "onLongPress");
    }

    // 在touch down后又没有滑动（onScroll），又没有长按（onLongPress），然后Touchup时触发
    // 类似于ACTION_UP
    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        Log.e("onSingleTapUp", "onSingleTapUp");
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
            float distanceY) {
        Log.e("onScroll", "onScroll");
        return false;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        Log.e("onFling", "onFling");
        return false;
    }
}