如何在Flutter中创建包含打开WebView中的FlatButton的图像的URL

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

class WebViewPage extends StatefulWidget {
  @override
  _WebViewPageState createState() => _WebViewPageState();
}

class _WebViewPageState extends State<WebViewPage> {
  final flutterWebViewPlugin = FlutterWebviewPlugin();

  @override
  void initState() {
    super.initState();
    flutterWebViewPlugin.onStateChanged.listen((WebViewStateChanged state) {
      // WebView状态变化时的处理
    });
  }

  @override
  void dispose() {
    flutterWebViewPlugin.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('WebView'),
      ),
      body: Center(
        child: FlatButton(
          onPressed: () {
            flutterWebViewPlugin.launch('https://www.example.com');
          },
          child: Image.network('https://www.example.com/image.jpg'),
        ),
      ),
    );
  }
}

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter WebView',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: WebViewPage(),
    );
  }
}