在flutter webview应用程序中自动打开目标应用程序

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

class WebViewApp extends StatefulWidget {
  @override
  _WebViewAppState createState() => _WebViewAppState();
}

class _WebViewAppState extends State<WebViewApp> {
  final String targetAppUrl = 'targetapp://open';

  Future<void> _openTargetApp() async {
    if (await canLaunch(targetAppUrl)) {
      await launch(targetAppUrl);
    } else {
      // 目标应用程序未安装的处理逻辑
      showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            title: Text('目标应用程序未安装'),
            content: Text('请先安装目标应用程序'),
            actions: [
              FlatButton(
                child: Text('确定'),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
            ],
          );
        },
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('WebView App'),
      ),
      body: WebView(
        initialUrl: 'https://example.com',
        javascriptMode: JavascriptMode.unrestricted,
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _openTargetApp,
        child: Icon(Icons.open_in_new),
      ),
    );
  }
}