code: public void setSearchHint(String searchHint) {
          mSearchHint = searchHint != null ? searchHint : getResources().getString(R.string.abc_search_hint);
          mSearchInput.setHint(mSearchHint);
      }
docs: Set a hint that will appear in the
  search input. Default hint is R.string.abc_search_hint
  which is "search..." (when device language is set to english)
  
  @param searchHint