Flutter localization without context

问题

I am trying to localize my app in flutter. I created the needed string.arb files for the supported languages. Now my question: Why does AppLocalizations.of(context) need a context?

I simply want to access the named strings in the files/locales files/classes. At some point in the app I build a List and fill it later via overriding some fields with a separate class.

However, this class has no context but I want to use localized strings in it. Can I write a method wich gets me the Localization of whatever String I put in?

回答1:

There is a library called easy_localization that does localization without context, you can simply use that one. Library also provides more convenient approach of writing less code and still localizing all the segments of the app. An example main class:

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
  ]).then((_) {
    runApp(EasyLocalization(
      child: MyApp(),
      useOnlyLangCode: true,
      startLocale: Locale('nl'),
      fallbackLocale: Locale('nl'),
      supportedLocales: [
        Locale('nl'),
        Locale('en'),
      ],
      path: 'lang',
    ));
  });
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SplashScreen(),
      supportedLocales: EasyLocalization.of(context).supportedLocales,
      locale: EasyLocalization.of(context).locale,
      localizationsDelegates: [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
        DefaultCupertinoLocalizations.delegate,
        EasyLocalization.of(context).delegate,
      ],
      localeResolutionCallback: (locale, supportedLocales) {
        if (locale == null) {
          EasyLocalization.of(context).locale = supportedLocales.first;
          Intl.defaultLocale = '${supportedLocales.first}';
          return supportedLocales.first;
        }

        for (Locale supportedLocale in supportedLocales) {
          if (supportedLocale.languageCode == locale.languageCode) {
            EasyLocalization.of(context).locale = supportedLocale;
            Intl.defaultLocale = '$supportedLocale';
            return supportedLocale;
          }
        }

        EasyLocalization.of(context).locale = supportedLocales.first;
        Intl.defaultLocale = '${supportedLocales.first}';
        return supportedLocales.first;
      },
    );
  }
}

Also don't forget to put localization path to your pubspec.yamal file!

After all of this is done, you can simply just use it in a Text widget like this:

Text(tr('someJsonKey'),),

来源：https://stackoverflow.com/questions/61563074/flutter-localization-without-context

标签

Flutter

localization