父级中的嵌套片段backpress孩子有问题 [英] Nested fragment backpress child inside parent have problem

问题描述

我有嵌套片段，片段内有片段.使用 NavigationBottomView .当我从父片段压缩到子片段时，一切正常.

I have nested fragment, fragment inside fragment. Using NavigationBottomView. Everything goes right when I backpress from parent to child fragment.

但是，现在，如果我在子片段中，突然我的手机屏幕关闭了，并且如果我再次打开屏幕并从我离开的地方进行反向按下，那没有用，我认为这是我忘记了或清除了我的反向堆栈.不知道为什么.我在下面的github链接上做了一个演示

But now, if I am inside child fragment and suddenly my phone screen goes off, and if I Open the screen again and backpress from where I left, it's not going I think it is forgot or clear my backstack. Don't know why. I have made a demo on github link below

  MessageListningFragment messageListningFragment = new MessageListningFragment();
    FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
    transaction.addToBackStack( null );
    transaction.replace( R.id.dynamic_container, messageListningFragment ).commitAllowingStateLoss();

github演示链接在这里

推荐答案

您应该使用带有NavHost片段的ViewPager/ViewPager2或带有

You should either use a ViewPager/ViewPager2 with NavHost fragments or implement BottomNavigationView with extension functions Google provided, which basically tags fragments and add them with NavHostFragment.create().

NavHostFragment负责childFragmentManager和后向堆栈管理.您可以在此处查阅示例.

NavHostFragment takes care of childFragmentManager and back stack management. You can check out examples here if you wish.

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