如何修复"字符串不是小部件类型的子类型"？

Question

我正在尝试使用Google翻译库来翻译输入文本，但是我收到一个错误，说字符串类型不是小部件类型的子类型

我尝试创建一个接收文本并返回翻译文本的函数，并在应用程序正文中使用了小部件

import 'package:flutter/material.dart';
import 'package:translator/translator.dart';
void main() => runApp(MyApp());
Widget translator(String input) {
  GoogleTranslator translator = GoogleTranslator();
  String translation = translator
      .translate("I would buy a car, if I had money.", from: 'en', to: 'ar')
      .toString();
  return translation as Widget;
}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Translator'),
        ),
        body: Center(
          child: translator("Hello World"),
        ),
      ),
    );
  }
}

我希望输出是屏幕中央的翻译文本

Answer 1

return translation as Widget;

应该是

return Text(translation);

更新

import 'package:flutter/material.dart';
import 'package:translator/translator.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Translator'),
        ),
        body: Center(
          child: MyHomePage(),
        ),
      ),
    );
  }
}
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  final _translations = <String,String>{};
  String translator(String input) {
    if(_translations.containsKey(input)) {
      return _translations[input];
    } else {
      _translate(input);
      return input;
    }
  }
  Future<void> _translate(String input) async { 
    GoogleTranslator translator = GoogleTranslator();
    String translation = await translator
        .translate("I would buy a car, if I had money.", from: 'en', to: 'ar');
    setState(() => _translations[input] = translation);
  }
  @override
  Widget build(BuildContext context) {
    return Text(translator("Hello World"));
  }
}