如何保持片段视图状态? [英] How to keep fragment view state?

问题描述

我对片段系统有疑问.

我有两个片段，例如 A和B

如果我将 A 移至 B ，

Navigation.findNavController(v).navigate(R.id.B)

现在 A 片段onDestroyView被称为我知道这是正常的.在 B 片段中，我调用了PopBackStack

Now A fragment onDestroyView is called i know it's normal. After in B Fragment i called PopBackStack

Navigation.findNavController(v).popBackStack()

现在一个片段onViewCreated被称为我也知道它是正常的.现在 A 片段将所有ui设为初始状态.

now A fragment onViewCreated is called i also know it's normal. Now A fragment all ui is initial state.

我的问题是如何保持片段UI状态，例如recyclerview滚动位置，FAB按钮可见性等

推荐答案

您必须将recyclerview滚动位置，FAB按钮可见性存储在变量中，并在调用onViewCreated之后设置这些值.

You have to store recyclerview scroll position, FAB button visibility in a variable and set those values after onViewCreated is called.

OR

您可以将其存储在onSaveInstanceState的Bundle中并保留其状态

You can store it in Bundle of onSaveInstanceState and retain its state

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
}

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