文章部分内容参考:
http://blog.csdn.net/barryhappy/article/details/7392326
总结:
1. event.getX()可以得到x的坐标,里面的参数0表示最开始的触摸;参数为1时表示第二个触摸点;
2. MotionEvent.ACTION_DOWN:在第一个点被按下时触发
3. MotionEvent.ACTION_UP:当屏幕上唯一的点被放开时触发
4. 如果食指先触摸屏幕,会触发ACTION_DOWN;然后抬起,会触发ACTION_UP;如果食指先触摸屏幕,中指再触摸屏幕,则中指会触发ACTION_POINTER_2_DOWN;此后抬起的手指就会触发ACTION_POINTER_2_UP(在本例中,不管是食指还是中指抬起);接着,可能再会按下和抬起,触发的则是ACTION_POINTER_1_DOWN和ACTION_POINTER_1_DOWN。
@SuppressWarnings("deprecation") public boolean onTouchEvent(MotionEvent event) { int action = event.getAction(); if (event.getPointerCount() == 2) { x1 = event.getX(1); y1 = event.getY(1); } x0 = event.getX(0); y0 = event.getY(0); switch (action) { case MotionEvent.ACTION_DOWN: HandleDown(getArea(x0, y0)); break; case MotionEvent.ACTION_UP: HandleUp(getArea(x0, y0)); break; //按下两个地方时,先抬起第1个,然后再按下,才会触发 ACTION_POINTER_1_DOWN case MotionEvent.ACTION_POINTER_1_DOWN: HandleDown(getArea(x0, y0)); break; case MotionEvent.ACTION_POINTER_1_UP: HandleUp(getArea(x0, y0)); break; case MotionEvent.ACTION_POINTER_2_DOWN: HandleDown(getArea(x1, y1)); break; case MotionEvent.ACTION_POINTER_2_UP: HandleUp(getArea(x1, y1)); break; } return super.onTouchEvent(event); }
Android多触点总结
时间: 2024-10-08 20:01:32