code: @NonNull public static <T> List<T> findByClass(@NonNull View rootView, Class<T> classType) {
          ViewGroup viewGroup = (ViewGroup) rootView.findViewById(android.R.id.content);
          return viewGroup == null ? new ArrayList<T>() : findByClass(viewGroup, classType);
      }
docs: Gets a List of Views matching a given class.
  
  @param rootView  the root View to traverse.
  @param classType the class to find.
  @param <T>       the class to find.
  @return a List of every matching View encountered.