PreferenceFragment.java 文件源码

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

    final PreferenceScreen preferenceScreen = getPreferenceScreen();
    if (preferenceScreen != null) {
        Bundle container = new Bundle();
        preferenceScreen.saveHierarchyState(container);
        outState.putBundle(PREFERENCES_TAG, container);
    }
}