在Flutter add2app场景中，如何让应用后退按钮返回主机应用？

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async {
        // 处理返回按钮点击事件
        // 在这里可以添加你的逻辑代码
        // 返回true表示允许返回，返回false表示阻止返回
        return true;
      },
      child: Scaffold(
        appBar: AppBar(
          title: Text('Flutter App'),
        ),
        body: Center(
          child: Text('Hello, World!'),
        ),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Add2App',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(),
    );
  }
}

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