如何在按下按钮时下载flutter web应用程序？

flutter_web: any

flutter packages get

import 'package:flutter_web/material.dart';
import 'package:http/http.dart' as http;

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: RaisedButton(
            child: Text('下载应用程序'),
            onPressed: () {
              downloadFile();
            },
          ),
        ),
      ),
    );
  }

  void downloadFile() async {
    var url = 'http://example.com/app.zip'; // 替换为你的应用程序下载链接
    var response = await http.get(url);
    // 将response.body保存为文件
    // ...
  }
}