如果滚动位置为0，则ViewPager2中的片段不会响应单击 [英] Fragments in ViewPager2 does not respond to clicks if scroll position is 0

问题描述

我很高兴Google发布了基于RecyclerView构建的 ViewPager2 解决了旧版ViewPager遇到的许多问题.

I am very glad that Google released ViewPager2 which is built on RecyclerView to solve a lot of issues that the old ViewPager has.

我很快将旧的ViewPager代码替换为ViewPager2:

I quickly replaced my old ViewPager codes to ViewPager2:

1. 用xml中的ViewPager2替换ViewPager

1. Replace ViewPager with ViewPager2 in xml

将FragmentPagerAdapter(FragmentManager)替换为FragmentStateAdapter(Fragment)

ViewPager的设置如下:

ViewPager setup is as below:

viewPager.adapter = fragmentAdapter

val mediator = TabLayoutMediator(tabLayout, viewPager, true) { tab, position ->
    tab.text = fragmentAdapter.tabNames[position]
}
mediator.attach()

没有其他更改.

执行上述更改后，我意识到了一个问题-

After performing the above change, I realized a problem -

现在，我的ViewPager是普通的水平寻呼机，我的fragmentAdapter中的每个片段都有一个垂直的RecyclerView.

Now my ViewPager is an ordinary horizontal pager, and each fragment in my fragmentAdapter has a vertical RecyclerView.

我观察到，无论何时RecyclerView的滚动位置为0，RecyclerView中的项目都不会收到任何单击或长按事件，但可以滚动.滚动后，它可以再次获得点击.*

知道ViewPager2也是RecyclerView，嵌套的RecyclerView有什么关系吗?

Knowing that ViewPager2 is a RecyclerView as well, is there something to do with nested RecyclerView?

推荐答案

事实证明，这可能是ConstraintLayout或ViewPager2中的错误.

It turns out it's probably a bug in either ConstraintLayout or ViewPager2.

ViewPager2的容器最初是一个ConstraintLayout，在我将其更改为LinearLayout之后，它就可以正常工作.

The container of ViewPager2 was originally a ConstraintLayout, and after I changed it to LinearLayout, it simply worked.

我试图在一个示例项目中重现该问题，但是即使使用ConstraintLayout，也无法重现此问题.因此，必须有其他条件才能实现此目的.

I tried to reproduce the issue in a sample project but I can't reproduce even if I used ConstraintLayout... So there must be some other conditions to make that happen.

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