flutter plugins插件【三】【Flutter Intl】

3、 Flutter Intl

多语言国际化

 在Android Studio中菜单Tools找到flutter intl创建多语言配置。

创建后会在pubspec.yaml出现

flutter_intl:enabled: true

在工程的lib会生成l10n与generated文件夹

l10n包含
intl_en.arb
intl_zn.arb

我们在intl_en.arb添加

{
'home': "Home",
}

在intl_zn.arb添加

{
'home': "首页",
}

注意：每次修改完arb文件保存一下即可生效

三、编写代码

创建LocalModel

// 共享状态
class SessionChangeNotifier with ChangeNotifier {Session get session => Global.session;String? get getToken => Global.session.token;@overridevoid notifyListeners() {// 保存Profile变更Global.saveProfile();//通知依赖的Widget更新super.notifyListeners();}
}

class LocaleModel extends SessionChangeNotifier {// 获取当前用户的APP语言配置Locale类，如果为null，则语言跟随系统语言Locale? getLocale() {if (session.locale == null) return null;var t = session.locale?.split("_");LoggerManager().debug("getLocale t:${t}");if (t != null && t.length == 2) {LoggerManager().debug("Locale t:${t}");return Locale(t[0], t[1]);}return null;}// 获取当前Locale的字符串表示String get locale => session.locale ?? "";// 用户改变APP语言后，通知依赖项更新，新语言会立即生效set locale(String locale) {LoggerManager().debug("locale:${locale}, profile.locale:${session.locale}");if (locale != session.locale) {session.locale = locale;notifyListeners();}}
}

在Main的入口中设置

class MyApp extends StatelessWidget {const MyApp({Key? key}) : super(key: key);// This widget is the root of your application.@overrideWidget build(BuildContext context) {return MultiProvider(providers: providers,child: Consumer3<ThemeModel, LocaleModel, UserModel>(builder: (context, themeModel, localeModel, userModel, child) {return RefreshConfiguration(hideFooterWhenNotFull: false, //列表数据不满一页,不触发加载更多child: ScreenUtilInit(designSize: const Size(375.0, 667.0),minTextAdapt: true,splitScreenMode: true,builder: (context, child) {return child ??buildMaterialApp(context, localeModel, themeModel, userModel);},child:buildMaterialApp(context, localeModel, themeModel, userModel),),);},),);}Widget buildMaterialApp(BuildContext context, LocaleModel localeModel,ThemeModel themeModel, UserModel userModel) {return MaterialApp(theme: ThemeData(fontFamily: "PingFang SC",primarySwatch: themeModel.theme,),navigatorKey: OneContext().key,debugShowCheckedModeBanner: false,supportedLocales: S.delegate.supportedLocales,locale: localeModel.getLocale(),initialRoute: buildInitialRoute(appModel: Provider.of<AppModel>(context, listen: false),userModel: userModel,),onGenerateRoute: RouterManager.generateRoute,navigatorObservers: buildObservers(),localizationsDelegates: const [S.delegate,RefreshLocalizations.delegate, //下拉刷新GlobalCupertinoLocalizations.delegate,GlobalMaterialLocalizations.delegate,GlobalWidgetsLocalizations.delegate],localeResolutionCallback: (_locale, supportedLocales) {if (localeModel.getLocale() != null) {//如果已经选定语言，则不跟随系统return localeModel.getLocale();} else {//跟随系统LoggerManager().debug("_locale：${_locale}");Locale locale;if (supportedLocales.contains(_locale)) {locale = _locale!;} else {//如果系统语言不是中文简体或美国英语，则默认使用美国英语locale = Locale('en', 'US');}return locale;}},builder: EasyLoading.init(builder: (BuildContext context, Widget? child) {return OneContext().builder(context,child,observers: buildObservers(),);}),home: buildGlobalGesture(context),);}Widget buildGlobalGesture(BuildContext context) {return GestureDetector(onTap: () {FocusScopeNode currentFocus = FocusScope.of(context);if (!currentFocus.hasPrimaryFocus &&currentFocus.focusedChild != null) {FocusManager.instance.primaryFocus?.unfocus();// 也可以使用如下方式隐藏键盘：// SystemChannels.textInput.invokeMethod('TextInput.hide');}},);}List<NavigatorObserver> buildObservers() {return [MyNavigatorObserver()];}String? buildInitialRoute({required AppModel appModel, required UserModel userModel}) {String? initialRoute;// String? isAgree = localeModel.isAgree;String? isAgree = "1";if ("1" == isAgree) {if (userModel.isLogin) {initialRoute = RouterName.main;} else {initialRoute = RouterName.login;}} else {initialRoute = RouterName.agreement;}return initialRoute;}
}

 之后我们可以在具体使用的地方这个配置的home。

return Scaffold(appBar: MyAppBar(label: S.of(context).home,isBackButton: false,),
body:Container(),);

更换语言环境页面

class LanguagePage extends StatefulWidget {const LanguagePage({Key? key, this.arguments}) : super(key: key);final Object? arguments;@overrideState<LanguagePage> createState() => _LanguagePageState();
}class _LanguagePageState extends State<LanguagePage> {@overrideWidget build(BuildContext context) {var color = Theme.of(context).primaryColor;var localeModel = Provider.of<LocaleModel>(context);Widget _buildLanguageItem(String lan, value) {LoggerManager().debug("_buildLanguageItem：${lan}, value:${value}");return SettingCheckItemWidget(title: lan,content: "",checkColor: color,isSelected: localeModel.locale == value,onPressed: () {// 此行代码会通知MaterialApp重新buildlocaleModel.locale = value;},);}return Scaffold(appBar: MyAppBar(onPressed: () {navigatorBack();},label: S.of(context).language,isBackButton: true,),body: ListView.builder(padding: EdgeInsets.symmetric(vertical: 15.0, horizontal: 10.0),addRepaintBoundaries: false,addAutomaticKeepAlives: false,itemCount: 3,itemBuilder: (context, index) {if (index == 0) {return _buildLanguageItem("中文简体", "zh_CN");}if (index == 1) {return _buildLanguageItem("English", "en_US");}if (index == 2) {return _buildLanguageItem(S.of(context).autoBySystem, null);}return Container();},),);}void userEnterApp() {// 点击进入appNavigatorPageRouter.pushReplacementNamed(RouterName.main);}void navigatorBack() {NavigatorPageRouter.pop();}
}