Android activity role to change and test different locales

Locale Activity Rule

    public static final Locale FRENCH_LOCALE = new Locale("fr", "FR");

    @Rule
    public ActivityTestRule<SplashScreenActivity> activityRule = new ActivityTestRule(SplashScreenActivity.class, true, true) {

        @Override
        protected void beforeActivityLaunched() {
            super.beforeActivityLaunched();
            Locale.setDefault(FRENCH_LOCALE);

            Resources res = getInstrumentation().getTargetContext().getResources();
            Configuration configuration = new Configuration();
            configuration.locale = FRENCH_LOCALE;
            res.updateConfiguration(configuration, res.getDisplayMetrics());
        }
    };