如何移动进行区分，并且点击的onTouchEvent（）？ [英] How to distinguish between move and click in onTouchEvent()?

问题描述

在我的应用程序，我需要同时处理移动和点击的事件。

In my application, I need to handle both move and click events.

一个点击是一个ACTION_DOWN行动，几个ACTION_MOVE动作和一个ACTION_UP动作序列。从理论上讲，如果你得到一个ACTION_DOWN事件，然后一个ACTION_UP事件 - 这意味着用户只需点击您的视图。

A click is a sequence of one ACTION_DOWN action, several ACTION_MOVE actions and one ACTION_UP action. In theory, if you get an ACTION_DOWN event and then an ACTION_UP event - it means that the user has just clicked your View.

但是，在实践中，这一序列不某些设备上工作。在我的三星Galaxy吉奥我得到这样的序列时，只需点击我的看法：ACTION_DOWN，几次ACTION_MOVE，然后ACTION_UP。即我得到一些不可预料的onTouchEvent生火用ACTION_MOVE行动code。我从来没有（或几乎没有）获得序列ACTION_DOWN - > ACTION_UP。

But in practice, this sequence doesn't work on some devices. On my Samsung Galaxy Gio I get such sequences when just clicking my View: ACTION_DOWN, several times ACTION_MOVE, then ACTION_UP. I.e. I get some unexpectable OnTouchEvent firings with ACTION_MOVE action code. I never (or almost never) get sequence ACTION_DOWN -> ACTION_UP.

我也不能使用OnClickListener，因为它不给出的点击的位置。所以，我怎么能检测单击事件，并从不同的举动呢？

I also cannot use OnClickListener because it does not gives the position of the click. So how can I detect click event and differ it from move?

推荐答案

下面是另一种解决方案，这是非常简单的，不需要你担心手指被移动。如果你是立足点击为简单移动的距离，那么你怎么能区分一个点击和长按。

Here's another solution that is very simple and doesn't require you to worry about the finger being moved. If you are basing a click as simply the distance moved then how can you differentiate a click and a long click.

您可以把更多的智慧到这一点，包括移动的距离，但我还没有碰到过一个实例时的距离，用户可以在200毫秒内移动应构成一个举动，而不是点击。

You could put more smarts into this and include the distance moved, but i'm yet to come across an instance when the distance a user can move in 200 milliseconds should constitute a move as opposed to a click.

setOnTouchListener(new OnTouchListener() {
    private static final int MAX_CLICK_DURATION = 200;
    private long startClickTime;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN: {
                startClickTime = Calendar.getInstance().getTimeInMillis();
                break;
            }
            case MotionEvent.ACTION_UP: {
                long clickDuration = Calendar.getInstance().getTimeInMillis() - startClickTime;
                if(clickDuration < MAX_CLICK_DURATION) {
                    //click event has occurred
                }
            }
        }
        return true;
    }
});

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