Flutter Web使用URL Launcher将pdf文件发送给WhatsApp联系人

dependencies:
  url_launcher: ^6.0.0

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

void sendPdfToWhatsApp(String pdfUrl) async {
  // 使用WhatsApp的URL Scheme
  final String whatsAppUrl = "https://api.whatsapp.com/send?";

  // 添加pdf文件的URL参数
  final String pdfParam = "text=${Uri.encodeFull(pdfUrl)}";

  // 构建最终的URL
  final String url = whatsAppUrl + pdfParam;

  // 使用URL Launcher打开WhatsApp链接
  if (await canLaunch(url)) {
    await launch(url);
  } else {
    throw '无法打开WhatsApp链接：$url';
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('发送PDF文件给WhatsApp联系人'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            // 替换为您的pdf文件URL
            String pdfUrl = "https://example.com/path/to/pdf_file.pdf";
            sendPdfToWhatsApp(pdfUrl);
          },
          child: Text('发送PDF'),
        ),
      ),
    ),
  ));
}