code: public void setIcon(CharSequence iconCode, IconSet iconSet) {
          setBootstrapText(new BootstrapText.Builder(getContext(), isInEditMode()).addIcon(iconCode, iconSet).build());
      }
docs: Sets the text to display a FontIcon, replacing whatever text is already present.
  Used to set the text to display a FontAwesome Icon.
  
  @param iconSet - An implementation of FontIcon