如何将我的位置从flutter应用程序共享到whatsapp number？

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

class ShareLocationPage extends StatelessWidget {
  final String phoneNumber;
  final double latitude;
  final double longitude;

  ShareLocationPage({required this.phoneNumber, required this.latitude, required this.longitude});

  void _shareLocationOnWhatsApp() async {
    String mapUrl = 'https://maps.google.com/?q=$latitude,$longitude'; // 使用Google Maps作为示例

    String whatsappUrl = 'https://api.whatsapp.com/send?phone=$phoneNumber&text=$mapUrl';

    if (await canLaunch(whatsappUrl)) {
      await launch(whatsappUrl);
    } else {
      throw '无法打开WhatsApp';
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('分享位置'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: _shareLocationOnWhatsApp,
          child: Text('分享位置到WhatsApp'),
        ),
      ),
    );
  }
}