code: public BaseRequestHandler loadHandler(String handlerClassName, String uri)
        throws
        ClassNotFoundException, NoSuchMethodException, IllegalAccessException,
        InvocationTargetException, InstantiationException {
      Class<? extends BaseRequestHandler> handlerClass =
          classLoader.loadClass(handlerClassName).asSubclass(BaseRequestHandler.class);
      Constructor<? extends BaseRequestHandler> constructor =
          handlerClass.getConstructor(String.class);
      return constructor.newInstance(uri);
    }
docs: Loads a {@link BaseRequestHandler} class from the extension dex.