code: public CharSequence getQueryHint() {
          if (mQueryHint != null) {
              return mQueryHint;
          } else if (mSearchable != null) {
              CharSequence hint = null;
              int hintId = mSearchable.getHintId();
              if (hintId != 0) {
                  hint = getContext().getString(hintId);
              }
              return hint;
          }
          return null;
      }
docs: Gets the hint text to display in the query text field.
  @return the query hint text, if specified, null otherwise.
  
  @attr ref android.R.styleable#SearchView_queryHint