code: public void updateIcon(long identifier, ImageHolder image) {
          IDrawerItem drawerItem = getDrawerItem(identifier);
          if (drawerItem instanceof Iconable) {
              Iconable pdi = (Iconable) drawerItem;
              pdi.withIcon(image);
              updateItem((IDrawerItem) pdi);
          }
      }
docs: update the name for a specific drawerItem
  identified by its id
  
  @param identifier
  @param image