docs: protected CharSequence convertSelectionToString(Object selectedItem) {
          switch (mAutoCompleteMode){
              case AUTOCOMPLETE_MODE_SINGLE:
                  return ((InternalAutoCompleteTextView)mInputView).superConvertSelectionToString(selectedItem);
              case AUTOCOMPLETE_MODE_MULTI:
                  return ((InternalMultiAutoCompleteTextView)mInputView).superConvertSelectionToString(selectedItem);
              default:
                  return null;
          }
      }