How to map navigation routing

RoutingMapping.java

    @Override
    protected Class<? extends MvcFragment> mapFragmentRouting(
            Class<? extends FragmentController> controllerClass) {
        String controllerPackage = controllerClass.getPackage().getName();

        //Find the classes of fragment under package .view and named in form of xxxScreen
        //For example

        //a.b.c.CounterMasterController -> a.b.c.view.CounterMasterScreen

        String viewPkgName = controllerPackage.substring(0, controllerPackage.lastIndexOf(".")) + ".view";
        String fragmentClassName = viewPkgName + "."
                + controllerClass.getSimpleName().replace("Controller", "Screen");

        try {
            return (Class<? extends MvcFragment>) Class.forName(fragmentClassName);
        } catch (ClassNotFoundException e) {
            String msg = String.format("Fragment class(%s) for controller(%s) can not be found",
                    fragmentClassName, controllerClass.getName());
            throw new RuntimeException(msg, e);
        }
    }