androidfragment-当另一个fragment被推到它上面时如何保存fragment中的视图状态

在Android开发中，Fragment是一种可以嵌入到Activity中的组件。它可以独立管理自己的布局和逻辑，并且可以在一个Activity中切换不同的Fragment来实现界面的切换。然而，当一个Fragment被推到另一个Fragment的上面时，原来的Fragment可能会被销毁或者进入不可见状态，这就导致了原来Fragment中的视图状态丢失的问题。那么，我们如何保存Fragment中的视图状态呢？

java
@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    // 保存视图状态
    outState.putInt("count", count);
}

java
@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    if (savedInstanceState != null) {
        // 恢复视图状态
        count = savedInstanceState.getInt("count");
    }
}

java
public class MyFragment extends Fragment {
    private int count = 0;
    private TextView countTextView;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);
        countTextView = view.findViewById(R.id.count_text_view);
        return view;
    }
    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("count", count);
    }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (savedInstanceState != null) {
            count = savedInstanceState.getInt("count");
        }
        updateCountTextView();
    }
    private void updateCountTextView() {
        countTextView.setText(String.valueOf(count));
    }
    public void incrementCount() {
        count++;
        updateCountTextView();
    }
}