1.Getx国际化

translations: Translation(),//语言包
locale: Locale('zh', 'CN'),//默认加载的语言
fallbackLocale: Locale('en', 'US'),//加载失败加载的语言
supportedLocales: Translation.supportedLocales, //支持的语言种类

//定义语言包
class Translation extends Translations {
  @override
  Map<String, Map<String, String>> get keys => {
    'en':{
      "hello":"hello"
    },
    'zh':{
      'hello':'你好'
    }
  };

  /// 支持语言列表
  static const supportedLocales = [
    Locale('en', 'US'),
    Locale('zh', 'CN'),
  ];
}

class LanguagePage extends StatelessWidget {
  const LanguagePage({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Text('多语言:'),
        Text('hello'.tr),
        ElevatedButton(onPressed: (){
          var locale = Locale('zh','CN');
          Get.updateLocale(locale);
        }, child: Text("切换成中文")),
        ElevatedButton(onPressed: (){
          var locale = Locale('en','US');
          Get.updateLocale(locale);
        }, child: Text("切换成英文")),
      ],
    );
  }
}

yaml 中引入

# 本地化
flutter_localizations:
  sdk: flutter

localizationsDelegates:  [
  GlobalMaterialLocalizations.delegate,
  GlobalWidgetsLocalizations.delegate,
  GlobalCupertinoLocalizations.delegate,
],

2.GetUtils工具类 是否是一个邮箱，是否是一个手机号，

TextField(
  controller: editingController,
),
ElevatedButton(
    onPressed: () {
      if (GetUtils.isEmail(editingController.text)) {
        Get.snackbar("是", "是邮箱");
      } else {
        Get.snackbar("不是", "不是邮箱");
      }
    },
    child: Text("校验"))