在屏幕旋转后，在片段中恢复微调器位置

Question

当我在标题中写下标题时，我希望在屏幕旋转后在旋转器中恢复所选位置。尝试通过在捆绑中保存位置来实现此目的，并在轮换后从arr获取位置

savedInstanceState

或

onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { }

或

onViewCreated(View view, Bundle savedInstanceState)

但没有人工作： - /

AddRecipeFragment

onActivityCreated(Bundle savedInstanceState) 

我还尝试了public class AddRecipeFragment extends Fragment implements ObservableScrollViewCallbacks { private static final String SELECTED_CATEGORY = "SELECTED_CATEGORY"; private Spinner categoriesSpinner; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_add_recipe, container, false); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); categoriesSpinner = (Spinner) view.findViewById(R.id.categories_spinner); ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(), R.array.categories, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); categoriesSpinner.setAdapter(adapter); if (savedInstanceState != null) { categoriesSpinner.setSelection(savedInstanceState.getInt(SELECTED_CATEGORY, 0), true); } } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(SELECTED_CATEGORY, categoriesSpinner.getSelectedItemPosition()); } } false 。

Answer 1

如果一切都失败了，为什么不使用静态变量？！

private static int selectedPosition = 0;

选择微调器项目时

categoriesSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        selectedPosition = position;
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }
});

和onViewCreated()方法内部

categoriesSpinner.setSelection(selectedPosition);