Question

我有几个碎片的后叠，我需要知道我已经从另一个碎片中返回了。

类似于您有onActivityResult时的情况，我想知道您是否可以检查片段中的popBackStack()呼叫？

我在另一个片段中称呼它

@Override
public void postFinished(){
    getFragmentManager().popBackStack();
}

Android Java中有这样的东西吗？

Answer 1

您可以在“活动”页面上为BackStackChange添加监听器，

     getSupportFragmentManager().addOnBackStackChangedListener(
            new FragmentManager.OnBackStackChangedListener() {
                public void onBackStackChanged() {

                       // Your Code Here

                }
            });

Answer 2

you can do in onViewCreated() method:

if (savedInstanceState == null && !mAlreadyLoaded) {
    mAlreadyLoaded = true;

    // Do this code only first time, not after rotation or reuse fragment from backstack
}
Because when android put fragment on backstack, it only destroy its view, but don't kill instance itself, so mAlreadyLoaded will be still true when fragment will be restored from backstack.

有没有一种方法可以检查片段中的popBackStack调用

2 个答案: