Java Android中的自定义触摸处理

我需要访问ACTION\u MOVE事件之后发生的ACTION\u UP，SimpleOnGestureListener不直接支持，因此我尝试在活动的onTouchEvent方法中实现自定义触摸处理，以便更熟悉它

该活动是指闹钟的警报屏幕在闹钟响起时出现。 我需要处理5种手势。它们是：

Single tap - Visual feedback
Double tap - Snooze the alarm
Swipe along the Y access - visual feedback based on distance swiped.
ACTION_UP after an ACTION_MOVE with a distance of less than 50% of the screen's Y axis - visual feedback.
ACTION_UP after an ACTION_MOVE with a distance of greater than 50% of the screen's Y axis - dismiss the alarm.

我编写的函数不能正常工作，我很确定这是因为每次调用onTouchEvent时都会设置starteEvent变量，而只应在刷卡或双击的第一次点击时设置

这是我的密码：

private final int DOUBLE_TAP_TIMEOUT = 500;  // ms
private boolean isScrolling = false;  // flag used to detect the ACTION_UP after a scroll
private boolean possibleDoubleTap = false;  // flag used to detect a double tap 
private MotionEvent startEvent;  // the event that starts the gesture we are trying to detect
private float yPercentScrolled;  // the percent the along the (Y axis / 2) that has been scrolled.
@Override
public boolean onTouchEvent(MotionEvent event){

    switch (event.getActionMasked()){

        case(MotionEvent.ACTION_DOWN):
            Log.d("MOTION", "DOWN");
            // reset the startEvent given the proper conditions
            if(
                    (!isScrolling && !possibleDoubleTap) 
                    || (possibleDoubleTap && event.getEventTime() - startEvent.getEventTime() <= DOUBLE_TAP_TIMEOUT) 
            ){
                startEvent = event;
            }
            return true;

        case(MotionEvent.ACTION_UP):
            Log.d("MOTION", "UP");
            if(isScrolling){
                isScrolling = false;

                if(yPercentScrolled >= 1f){
                    dismissAlarm();
                }
                else {
                    layout.setBackgroundColor(bgColor);
                    startEvent = null;
                    possibleDoubleTap = false;
                    isScrolling = false;
                }
            }
            else if(possibleDoubleTap){
                // if we have a double tap
                if(event.getEventTime() - startEvent.getEventTime() <= DOUBLE_TAP_TIMEOUT){
                    snoozeAlarm();
                    return true;
                }
                // if we don't have a double tap, do nothing
            }
            else if(!possibleDoubleTap){
                possibleDoubleTap = true;
                layout.setBackgroundColor(Color.parseColor("#000000"));
            }
            return true;

        case(MotionEvent.ACTION_MOVE):
            Log.d("MOTION", "MOVE");
            if(!isScrolling){
                isScrolling = true;
            }
            else {
                yPercentScrolled = handleScroll(event, startEvent);
            }
            return true;

        default:
            Log.d("MOTION", "other:" + String.valueOf(event.getActionMasked()));
            return super.onTouchEvent(event);
    }
}

你知道为什么StarteEvent在不应该重置的时候被重置了吗？并没有运动：当它被重置时，在logcat中下降，所以这个问题让我很困惑。这也是startEvent被分配给null以外的其他对象的唯一位置

谢谢。

似乎startEvent=event正在将引用分配给对象事件，而不是对象本身。因此，当对象事件的值发生变化时。startEvent的值也会更改

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尝试获取并存储案例中所需的值，即X、Y和EventTime，而不是整个事件对象。

我实际上刚刚通过调试器，意识到情况就是这样。我使用了代码startEvent=MotionEvent.obtainevent；克隆对象，以便传递MotionEvent，而不是几个变量。我认为我的onTouchEvent现在工作正常，但我还没有测试每个输入组合。谢谢