code: public static String buildAction(Class<?> clazz, String action) {
          return new StringBuilder().append(clazz.getCanonicalName()).append(".").append(action).toString();
      }
docs: Build a custom intent action name, like "jp.co.nohana.amalgam.Sample.ACTION_SAMPLE".
  @param clazz the class name.
  @param action the action name.
  @return the custom action name.