example app with i18n

app.dart

class PhotoChatApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider<AppContext>(
        create: (context) =>
            AppContext(appRunningStateOverride: this.appRunningState),
        child: MaterialApp(
          title: 'Mini Donkey',
          localizationsDelegates: [
            AppLocalizationsDelegate(),
            GlobalMaterialLocalizations.delegate,
            GlobalWidgetsLocalizations.delegate,
            GlobalCupertinoLocalizations.delegate,
          ],
          localeResolutionCallback:
              (Locale locale, Iterable<Locale> supportedLocales) {
            print('checking ' + locale.toString());
            return locale;
          },
          supportedLocales: [
            const Locale('en'),
            const Locale.fromSubtags(languageCode: 'zh'),
          ],
        ));
  }
}