@Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
      View view;

      if (convertView == null) {
        // Inflate the drop down using the helper's LayoutInflater
        LayoutInflater inflater = mDropDownHelper.getDropDownViewInflater();
        view = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);
      } else {
        view = convertView;
      }

      TextView textView = (TextView) view.findViewById(android.R.id.text1);
      textView.setText(getItem(position));

      return view;
    }
 @Override
 public Theme getDropDownViewTheme() {
   return mDropDownHelper.getDropDownViewTheme();
 }
 @Override
 public void setDropDownViewTheme(Theme theme) {
   mDropDownHelper.setDropDownViewTheme(theme);
 }