导航回 FragmentPagerAdapter ->碎片是空的 [英] Navigating back to FragmentPagerAdapter -> fragments are empty

问题描述

我有一个 Fragment(我将其称为 pagerFragment)，它被添加到 backstack 并且是可见的.它包含一个 viewPager 和一个 FragmentPagerAdapter.FragmentPagerAdapter 包含(假设)两个片段:A 和 B.

I have a Fragment (I'll call it pagerFragment) that is added to the backstack and is visible. It holds a viewPager with a FragmentPagerAdapter. The FragmentPagerAdapter holds (let's say) two fragments: A and B.

首先添加片段效果很好.

First adding of the fragments works great.

片段 A 有一个按钮，一旦点击，就会将片段 (C) 添加到 backstack.

Fragment A has a button that once clicked, adds a fragment (C) to the backstack.

问题是这样的:如果我添加那个片段(C)，然后点击返回，pagerAdapter是空的，我看不到里面的任何片段.

The problem is this: if I add that fragment (C), and then click back, the pagerAdapter is empty, and I cannot see any fragments inside.

如果我使用 hack 并销毁 pagerFragment s onDestroyView() 中的子片段(A 和 B)，这解决了问题，尽管我没有不想使用这个黑客.

If I use a hack, and destroy the children fragments (A and B) in the pagerFragments onDestroyView(), this solves the problem, although I don't wan't to use this hack.

任何想法可能是什么问题?

Any ideas what the issue could be?

推荐答案

我遇到了同样的问题.我的解决方案很简单:

I had the same problem. The solution for me was simple:

在 onCreateView 我有:

in onCreateView I had:

// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(getActivity()
    .getSupportFragmentManager());

其中 SectionPageAdapter 是这样的:

where SectionPageAdapter is something like this:

class SectionsPagerAdapter extends FragmentPagerAdapter {
...
}

将 getSupportFragmentManager 更改为

after changing getSupportFragmentManager to

mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());

它开始工作了！希望这会有所帮助.

it started working! Hope this helps.

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