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# 应用程序内切换语言
应用程序实现切换语言功能只需将 MaterialApp 中 locale 属性作为一个变量,切换不同的 Locale 即可达到切换语言的目的。代码如下:
class IntlApp extends StatelessWidget {
Widget build(BuildContext context) {
return MyApp();
}
}
class MyApp extends StatefulWidget {
MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> {
static _AppSetting setting = _AppSetting();
void initState() {
super.initState();
setting.changeLocale = (Locale locale) {
setState(() {
setting._locale = locale;
});
};
}
Widget build(BuildContext context) {
return MaterialApp(
onGenerateTitle: (context) {
return AppLocalizations.of(context).title;
},
localeResolutionCallback:
(Locale locale, Iterable<Locale> supportedLocales) {
var result = supportedLocales
.where((element) => element.languageCode == locale.languageCode);
if (result.isNotEmpty) {
return locale;
}
return Locale('zh');
},
locale: setting._locale,
localizationsDelegates: [
AppLocalizationsDelegate(),
GlobalMaterialLocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
GlobalCupertinoLocalizations.delegate,
],
supportedLocales: [
const Locale('zh'),
const Locale('en'),
],
home: _HomePage(),
);
}
}
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_HomePage 代码:
class _HomePage extends StatefulWidget {
__HomePageState createState() => __HomePageState();
}
class __HomePageState extends State<_HomePage> {
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('${AppLocalizations.of(context).title}'),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
RaisedButton(
child: Text('中文'),
onPressed: () {
MyAppState.setting.changeLocale(Locale('zh'));
},
),
RaisedButton(
child: Text('英文'),
onPressed: () {
MyAppState.setting.changeLocale(Locale('en'));
},
),
],
),
],
),
);
}
}
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_AppSetting 代码:
class _AppSetting {
_AppSetting();
Null Function(Locale locale) changeLocale;
Locale _locale;
}
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