code: public static String getString(@NonNull final Context context, @AttrRes final int resourceId) {
          return getString(context, -1, resourceId);
      }
docs: Obtains the string, which corresponds to a specific resource id, from a context's theme. If
  the given resource id is invalid, a {@link NotFoundException} will be thrown.
  
  @param context
  The context, which should be used, as an instance of the class {@link Context}. The
  context may not be null
  @param resourceId
  The resource id of the attribute, which should be obtained, as an {@link Integer}
  value. The resource id must corresponds to a valid theme attribute
  @return The string, which has been obtained, as a {@link String}