我安装了webview_flutter。我也运行了pub get。另外，我添加了导入“package：webview_flutter/webview_flutter. dart”。但实际上我不能在flutter中使用WebView小部件。这是我的代码。WebView发生了找不到错误。

import 'dart:io'; // Add this import.
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

class WebViewExample extends StatefulWidget {
  @override
  _WebViewExampleState createState() => _WebViewExampleState();
}

class _WebViewExampleState extends State<WebViewExample> {
  @override
  void initState() {}
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
      title: const Text('WebView Example'),
    ),
    body: Builder(builder: (BuildContext context){
      return WebView(
        initialUrl: 'https://flutter.dev',
      );
    }),
    );
  }
}