Cargar fragmentos a una actividad en Android

Navegación.java

@Override
    public void onNavigationDrawerItemSelected(int position) {
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        Fragment fragment = null;

        switch (position){
            case 0:
                fragment = new Noticias();
                break;
            case 1:
                fragment = new Videos();
                break;
            default:
                fragment = new Noticias();
                break;
        }
        fragmentTransaction.replace(R.id.container, fragment);
        fragmentTransaction.commit();
    }