java - 获取自定义 ArrayAdapter(Spinner) 中项目的位置

Question

我保存用户选择，并希望在用户返回活动时通​​过自动选择微调器项目来显示用户选择的项目。

类型CustomArrayAdapter

public class TypesCustomArrayAdapter extends ArrayAdapter<String> {

    private final LayoutInflater mInflater;
    private final Context mContext;
    private final List<TypesSpinnerItemObject> items;
    private final int mResource;

    public TypesCustomArrayAdapter(@NonNull Context context, @LayoutRes int resource,
                                     @NonNull List objects) {
        super(context, resource, 0, objects);

        mContext = context;
        mInflater = LayoutInflater.from(context);
        mResource = resource;
        items = objects;
    }
    @Override
    public View getDropDownView(int position, @Nullable View convertView,
                                @NonNull ViewGroup parent) {
        return createItemView(position, convertView, parent);
    }

    @Override
    public @NonNull View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        return createItemView(position, convertView, parent);
    }


    private View createItemView(int position, View convertView, ViewGroup parent){

        final View view = mInflater.inflate(mResource, parent, false);

        TextView txtName = (TextView) view.findViewById(R.id.name);
        TextView txtId = (TextView) view.findViewById(R.id.code);


        TypesSpinnerItemObject item = items.get(position);
        txtName.setText(item.Name);
        txtId.setText(item.Id);

        return view;
    }

我如何填充微调器

ArrayAdapter vaziatSokonatAdapter = TypesCustomArrayAdapter(VillageInputActivity.this, R.layout.item_types_spinner, response.body());`

保存用户选择：

Object ss = mySpinner.getSelectedItem();
Gson gson = new Gson();
String json = gson.toJson(ss);

SharedPreferences.Editor editor = getSharedPreferences("ss", MODE_PRIVATE).edit();
editor.putString("ss", json);
editor.apply();

我如何尝试更改微调器的选定项目：

SharedPreferences sh = getSharedPreferences("ss", MODE_PRIVATE);

String ss= sh.getString("ss", "");
Gson gson = new Gson();
Object ss = gson.fromJson(ss, mySpinner.getSelectedItem().getClass());
  mySpinner.setSelection(vaziatSokonatAdapter.getPosition(ss));

但 vaziatSokonatAdapter.getPosition(ss) 返回 -1

标签： javaandroid