flutter使用url_launcher uri发送电子邮件

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Email Launcher Example'),
        ),
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              const uri = 'mailto:test@example.com?subject=Hello%20Flutter';
              if (await canLaunch(uri)) {
                await launch(uri);
              } else {
                throw 'Could not launch $uri';
              }
            },
            child: Text('Send Email'),
          ),
        ),
      ),
    );
  }
}