private void refreshBlogFragments(ReaderBlogType blogType) {
   for (Fragment fragment : mFragments) {
     if (fragment instanceof ReaderBlogFragment) {
       ReaderBlogFragment blogFragment = (ReaderBlogFragment) fragment;
       if (blogType == null || blogType.equals(blogFragment.getBlogType())) {
         blogFragment.refresh();
       }
     }
   }
 }