locale-android.java

private String currentLocale;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    currentLocale = getResources().getConfiguration().locale.toString();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    String newLocale = newConfig.locale.toString();
    
    if (currentLocale.equals(newLocale)) {
        return;
    }
    
    currentLocale = newLocale;
    final ReactInstanceManager instanceManager = getReactInstanceManager();
    instanceManager.recreateReactContextInBackground();
}