如何在Webview Flutter中拦截广告

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

class MyWebView extends StatefulWidget {
  @override
  _MyWebViewState createState() => _MyWebViewState();
}

class _MyWebViewState extends State<MyWebView> {
  WebViewController _webViewController;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Webview Flutter'),
      ),
      body: WebView(
        initialUrl: 'https://example.com',
        javascriptMode: JavascriptMode.unrestricted,
        onWebViewCreated: (WebViewController controller) {
          _webViewController = controller;
        },
        navigationDelegate: (NavigationRequest request) {
          if (isAd(request.url)) {
            // 拦截广告链接
            return NavigationDecision.prevent;
          }
          return NavigationDecision.navigate;
        },
      ),
    );
  }

  bool isAd(String url) {
    // 判断URL是否为广告链接的逻辑
    // 可以使用正则表达式或其他方式进行判断
    // 返回true表示是广告链接，返回false表示不是广告链接
    return url.contains('ad');
  }
}