问Firebase远程配置-语言条件不工作- android

EN

            Locale locale = new Locale("ar");//or "fr" if user selects french
            Locale.setDefault(locale);
            Configuration configuration = new Configuration();
            configuration.locale = locale;
            getResources().updateConfiguration(configuration, getResources().getDisplayMetrics());

mFirebaseRemoteConfig = FirebaseRemoteConfig.getInstance();
mFirebaseRemoteConfig.setDefaults(R.xml.remote_config_defaults);

long cacheExpiration = 0;
mFirebaseRemoteConfig.fetch(cacheExpiration)
        .addOnCompleteListener(MainActivity.this, new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                if (task.isSuccessful()) {
                    Toast.makeText(MainActivity.this, "Fetch Succeeded",
                            Toast.LENGTH_SHORT).show();

                    // After config data is successfully fetched, it must be activated before newly fetched
                    // values are returned.
                    mFirebaseRemoteConfig.activateFetched();
                } else {
                    Toast.makeText(MainActivity.this, "Fetch Failed",
                            Toast.LENGTH_SHORT).show();
                }
                String welcomeMessage1 = mFirebaseRemoteConfig.getString("message1");
                String welcomeMessage2 = mFirebaseRemoteConfig.getString("message2");
            }
        });