恢复微调位置片段，屏幕旋转后 [英] Restore spinner position in Fragment, after screen rotation

问题描述

正如我在标题写的标题，我想恢复选定的位置微调，屏幕旋转之后。试图通过保存包的第做到这一点，并在旋转后获得 savedInstanceState 位置

As I wrote in title the title, I want restore selected position in spinner, after screen rotation. Tried do this by saving position in bundle, and get position from savedInstanceState after rotation in

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

或

onViewCreated(View view, Bundle savedInstanceState)

或

onActivityCreated(Bundle savedInstanceState) 

但没有人作品： - /

but no one works :-/

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());
    }
}

我也试过 setSelection（位置，FALSE）是假

推荐答案

如果全部失败，你为什么不使用静态变量？！

If all that failed, why don't you use a static variable?!

private static int selectedPosition = 0;

和选择时微调项

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

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

和里面的 onViewCreated（）法

categoriesSpinner.setSelection(selectedPosition);

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