触摸屏幕时，没搞懂每个事件的启动顺序。本文记录onTouchEvent发生时，每个事件启动的顺序。
测试代码
@Override
public boolean onTouchEvent(MotionEvent event) {
int pointCount = event.getPointerCount();
switch (pointCount) {
case 1:
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
Log.e("touch", "1 down-------");
break;
case MotionEvent.ACTION_MOVE:
Log.e("touch", "1 move-------");
break;
case MotionEvent.ACTION_UP:
Log.e("touch", "1 up-------");
break;
}
break;
case 2:
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_POINTER_DOWN:
Log.e("touch", "2 down-------");
break;
case MotionEvent.ACTION_MOVE:
Log.e("touch", "2 move-------");
break;
case MotionEvent.ACTION_POINTER_UP:
Log.e("touch", "2 up-------");
break;
}
break;
case 3:
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_POINTER_DOWN:
Log.e("touch", "3 down-------");
break;
case MotionEvent.ACTION_MOVE:
Log.e("touch", "3 move-------");
break;
case MotionEvent.ACTION_POINTER_UP:
Log.e("touch", "3 up-------");
break;
}
break;
}
return true;
输出结果
单点触摸
07-17 11:29:38.651 15874-15874/com.example.tony.ring E/touch: 1 down-------
07-17 11:29:38.664 15874-15874/com.example.tony.ring E/touch: 1 move-------
07-17 11:29:38.677 15874-15874/com.example.tony.ring E/touch: 1 up-------
两点触摸
07-17 11:30:36.610 15874-15874/com.example.tony.ring E/touch: 1 down-------
07-17 11:30:36.611 15874-15874/com.example.tony.ring E/touch: 1 move-------
07-17 11:30:36.612 15874-15874/com.example.tony.ring E/touch: 2 down-------
07-17 11:30:36.637 15874-15874/com.example.tony.ring E/touch: 2 move-------
07-17 11:30:36.637 15874-15874/com.example.tony.ring E/touch: 2 up-------
07-17 11:30:36.638 15874-15874/com.example.tony.ring E/touch: 1 up-------
或者
07-17 11:31:43.909 15874-15874/com.example.tony.ring E/touch: 1 down-------
07-17 11:31:43.910 15874-15874/com.example.tony.ring E/touch: 2 down-------
07-17 11:31:43.942 15874-15874/com.example.tony.ring E/touch: 2 move-------
07-17 11:31:43.943 15874-15874/com.example.tony.ring E/touch: 2 up-------
07-17 11:31:43.943 15874-15874/com.example.tony.ring E/touch: 1 up-------
三点触摸
07-17 11:32:46.598 15874-15874/com.example.tony.ring E/touch: 1 down-------
07-17 11:32:46.602 15874-15874/com.example.tony.ring E/touch: 2 down-------
07-17 11:32:46.604 15874-15874/com.example.tony.ring E/touch: 3 down-------
07-17 11:32:46.604 15874-15874/com.example.tony.ring E/touch: 3 move-------
07-17 11:32:46.604 15874-15874/com.example.tony.ring E/touch: 3 up-------
07-17 11:32:46.605 15874-15874/com.example.tony.ring E/touch: 2 move-------
07-17 11:32:46.605 15874-15874/com.example.tony.ring E/touch: 2 up-------
07-17 11:32:46.607 15874-15874/com.example.tony.ring E/touch: 1 up-------
或者
07-17 11:33:06.252 15874-15874/com.example.tony.ring E/touch: 1 down-------
07-17 11:33:06.254 15874-15874/com.example.tony.ring E/touch: 2 down-------
07-17 11:33:06.256 15874-15874/com.example.tony.ring E/touch: 3 down-------
07-17 11:33:06.271 15874-15874/com.example.tony.ring E/touch: 3 move-------
07-17 11:33:06.288 15874-15874/com.example.tony.ring E/touch: 3 move-------
07-17 11:33:06.288 15874-15874/com.example.tony.ring E/touch: 3 up-------
07-17 11:33:06.289 15874-15874/com.example.tony.ring E/touch: 2 up-------
07-17 11:33:06.289 15874-15874/com.example.tony.ring E/touch: 1 up-------
多点触摸时，有没有ACTION_MOVE的动作不能保证，
点击时肯定先是
1 down -> 2 down -> 3 down
释放时
3 up -> 2 up -> 1 up
Author
Tony Liu
2016-7-17， Shenzhen