Navigate back to fragmentpageradapter - & gt; Fragment is empty - navigating back to fragmentpageradapter - & gt; fragments are empty

problem ：

I have a Fragment (I'll call it pagerFragment ) that is added to the backstack and is visible. I have one Fragment（ I call it pagerFragment ）, It is added to backstack And it's visible .It holds a viewPager with a FragmentPagerAdapter . It has a with FragmentPagerAdapter Of viewPager .The FragmentPagerAdapter holds (let's say) two fragments: A and B.FragmentPagerAdapter contain （ hypothesis ） Two clips ：A and B.

First adding of the fragments works great. First of all, adding clips works well .

Fragment A has a button that once clicked, adds a fragment (C) to the backstack. fragment A There's a button , When you click the button , The clip (C) Add to backstack.

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. The problem is that ： If I add that clip （C）, Then click back , pagerAdapter It's empty. , I can't see any clips in it .

If I use a hack, and destroy the children fragments (A and B) in the pagerFragment s onDestroyView() , this solves the problem, although I don't wan't to use this hack. If I use hack And destroy pagerFragment s onDestroyView() Sub segments of （A and B onDestroyView() , This can solve the problem , Although I don't want to use this hack.

Any ideas what the issue could be? Any idea may be a problem ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/1C9Up