AmeerAmjed/flutter_multi_language

Multi language In flutter without packages.

Flutter localization

Flutter multi language without use package.

Android Screenshots Localizations

English language	Arabic language

steps

1. create file as assets

Directory assets

assets
└── lang
    ├── en.json
    └── ar.json

• set key and value
• en.json

{
    "title_Home": "Flutter Demo Home Page",
    "counter": "You have pushed the button this many times:",
    "tooltip_Increment": "Increment"
}

• ar.json

{
    "title_Home": "فلاتر ديو صفحة الرئيسية",
    "counter": "لقد ضغطت على الزر عدة مرات:",
    "tooltip_Increment": "زيادة"
}

2. Go to pubspec.yaml file.

• add flutter_localizations as dependencies.

dependencies:
 flutter:
   sdk: flutter
 flutter_localizations:
   sdk: flutter

• import file assets lang

 assets:
   - assets/lang/

3. create AppLocalizations and AppLocalizationsDelegate classes.

AppLocalizations

class AppLocalizations {
  late Locale locale;
  late Map<String, String> _valueText;
  AppLocalizations(this.locale);

  static AppLocalizations of(BuildContext context) {
    return Localizations.of(context, AppLocalizations);
  }

  static const LocalizationsDelegate<AppLocalizations> delegate =
      AppLocalizationsDelegate();

  Future loadTranslateFile() async {
    String _langFile =
        await rootBundle.loadString('assets/lang/${locale.languageCode}.json');

    Map<String, dynamic> _json = jsonDecode(_langFile);
    _valueText = _json.map((key, value) => MapEntry(key, value.toString()));
  }

  String getTranslate(String key) {
    return _valueText[key]!;
  }
}

AppLocalizationsDelegate

class AppLocalizationsDelegate extends LocalizationsDelegate<AppLocalizations> {
  const AppLocalizationsDelegate();
  @override
  bool isSupported(Locale locale) {
    return ['en', 'ar'].contains(locale.languageCode);
  }

  @override
  Future<AppLocalizations> load(Locale locale) async {
    AppLocalizations appLocalizations = AppLocalizations(locale);
    await appLocalizations.loadTranslateFile();
    return appLocalizations;
  }

  @override
  bool shouldReload(covariant AppLocalizationsDelegate old) => false;
}

4. injection appLocalizations delegate in root widget.

MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      localizationsDelegates: const [
        AppLocalizations.delegate,
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      supportedLocales: const [
        Locale('en', ''),
        Locale('ar', ''),
      ],
// check Locale supported
      localeResolutionCallback:
          (Locale? deviceLocale, Iterable<Locale> supportedLocales) =>
              deviceLocale != null &&
                      ['en', 'ar'].contains(deviceLocale.languageCode)
                  ? deviceLocale
                  : supportedLocales.first,
      home: const MyHomePage(),
    );

5. use AppLocalizations to get text.

AppLocalizations.of(context).getTranslate(keyJsonFile);
AppLocalizations.of(context).getTranslate('tooltip_Increment');

The end

Thank's to read ,hope help you.