ACTION_MOVE, ACTION_UP去哪了,却来了个 ACTION_CANCEL(4.3)

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

findViewById(R.id.tv1).setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            Log.e(TAG, " tv1 -------------- ACTION_UP ");
        } else if (event.getAction() == MotionEvent.ACTION_DOWN) {
            Log.e(TAG, " tv1 -------------- ACTION_DOWN ");
        } else if (event.getAction() == MotionEvent.ACTION_CANCEL) {
            Log.e(TAG, " tv1 -------------- ACTION_CANCEL ");
        } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
            Log.e(TAG, " tv1 -------------- ACTION_MOVE ");
        } else {
            Log.e(TAG, " tv1 -------------- " + event.getAction());
        }
        return true;
    }
});

findViewById(tv2).setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            Log.e(TAG, " tv2 -------------- ACTION_UP ");
        } else if (event.getAction() == MotionEvent.ACTION_DOWN) {
            Log.e(TAG, " tv2 -------------- ACTION_DOWN ");
        } else if (event.getAction() == MotionEvent.ACTION_CANCEL) {
            Log.e(TAG, " tv2 -------------- ACTION_CANCEL ");
        } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
            Log.e(TAG, " tv2 -------------- ACTION_MOVE ");
        } else {
            Log.e(TAG, " tv2 -------------- " + event.getAction());
        }
        return true;
    }
});

}

布局中只有2 TextView

操作步骤：
1,　1根手指按下tv1;
2, 2根手指按下tv2;
3, 放开所有手指．

4.3(API18) log
tv1 -------------- ACTION_DOWN
tv1 -------------- ACTION_MOVE
tv1 -------------- ACTION_MOVE
tv1 -------------- ACTION_MOVE
tv2 -------------- ACTION_DOWN
tv1 -------------- ACTION_MOVE
tv2 -------------- ACTION_MOVE
tv1 -------------- ACTION_MOVE
tv2 -------------- 261
tv1 -------------- ACTION_MOVE
tv2 -------------- ACTION_CANCEL
tv1 -------------- ACTION_CANCEL

5.0(>API18) log

tv1 -------------- ACTION_DOWN
tv1 -------------- ACTION_MOVE
tv1 -------------- ACTION_MOVE
tv1 -------------- ACTION_MOVE
tv2 -------------- ACTION_DOWN
tv1 -------------- ACTION_MOVE
tv2 -------------- ACTION_MOVE
tv1 -------------- ACTION_MOVE
tv2 -------------- 261
tv1 -------------- ACTION_MOVE
tv1 -------------- ACTION_MOVE
tv2 -------------- 6
tv1 -------------- ACTION_MOVE
tv2 -------------- ACTION_UP
tv1 -------------- ACTION_MOVE
tv1 -------------- ACTION_UP

在4.3(一加手机)上为什么在第２步后，tv1　tv２怎么都来了ACTION_CANCEL，　而不是ACTION_MOVE？　　如何得到ACTION_MOVE？

求救各位，谢谢！

http://www.dewen.net.cn/q/9011