Flutter App本地化:如何使用字符串键获取值？

{
  "title": {
    "en": "Welcome",
    "zh": "欢迎"
  },
  "description": {
    "en": "This is a Flutter app",
    "zh": "这是一个Flutter应用"
  }
}

import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      localizationsDelegates: [
        AppLocalizations.delegate,
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale('en', ''), // 英语
        const Locale('zh', ''), // 中文
      ],
      // ...
    );
  }
}

import 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Text(
      AppLocalizations.of(context).title, // 使用字符串键获取标题的本地化值
      style: TextStyle(fontSize: 24),
    );
  }
}