正确检测在Android中放置在ViewPager内的GridView上的滑动 [英] Correctly detecting a swipe on a GridView placed inside a ViewPager in Android

问题描述

我有一个ViewPager，它使用GridViews作为页面.我希望ViewPager在屏幕上滑动时可以切换页面.

I have a ViewPager which uses GridViews for pages. I would like the ViewPager to switch pages when I swipe across the screen.

问题是在GridView上进行滑动时未检测到滑动.在GridView外部，滑动可以正常工作.似乎GridView捕获了所有触摸事件，而没有先将其传递给ViewPager.

The problem is that swipes are not detected when they are made across the GridView. Outside of the GridView, the swipes work correctly; it seems that the GridView is trapping all touch events without passing it to ViewPager first.

在摆弄源代码的同时，我对从GridView扩展的自定义类进行了此操作:

While fiddling with the source code, I did this to a custom class extended from GridView:

@Override
public boolean onTouchEvent(MotionEvent event) {
    return pager.onInterceptTouchEvent(event);
}

-其中 pager 指的是ViewPager类.这样，ViewPager可以正确检测滑动并相应地移动页面，但是它不允许GridView接受任何事件，因此我无法单击这些项目.

-- where pager refers to the ViewPager class. With this, ViewPager will correctly detect swipes and move pages accordingly, but it doesn't allow GridView to accept any events, so I can't click on the items.

我想做的是正确检测ViewPager中的滑动和GridView上的项目单击.

What I would like to be able to do is correctly detect swipes in ViewPager and item clicks on GridView.

推荐答案

我对colig的实现有麻烦，但是我可以通过继承ViewPager并重写onInterceptTouchEvent()方法来使其工作.我只检查了X方向上的滑动，以便在必要时进行垂直滚动.

I had trouble with colig's implementation, but I was able to get it to work by subclassing ViewPager and overriding the onInterceptTouchEvent() method. I only checked for swipes in the X direction to allow for vertical scrolling if necessary.

private static final int minSwipeDistance = 30;
private float mTouchX;

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
    boolean response = super.onInterceptTouchEvent(event);
    float x = event.getX();
    switch (event.getActionMasked()) {
    case MotionEvent.ACTION_DOWN:
        mTouchX = x;
        break;
    case MotionEvent.ACTION_MOVE:
        float dX = Math.abs(x - mTouchX);
        if (dX > minSwipeDistance)
            return true;
        break;
    }
    return response;
}

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