bir zamanlar ufakça yazıp kenara atmışım işinize yarar

main.dart

import 'package:flutter/material.dart';import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';import 'custom-web-view.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {  // This widget is the root of your application.  @override  Widget build(BuildContext context) {    return MaterialApp(      title: 'Flutter Demo',      theme: ThemeData(        primarySwatch: Colors.blue,      ),      home: MyHomePage(),    );  }}
class MyHomePage extends StatelessWidget {
  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(title: Text('Enes Şahin'),      backgroundColor: Colors.blueGrey,      ),             drawer: Drawer(         child: ListView(           children: <Widget>[           DrawerHeader(              padding: EdgeInsets.all(0),             child: Container(               padding: EdgeInsets.all(20),           color: Colors.blueGrey,            child: Row(             crossAxisAlignment: CrossAxisAlignment.end,           children: <Widget>[             Text('Enes Şahin'),           ],           ),                    ),           ),           ListTile(leading: Icon(Icons.home),           title: Text('Home'),           ),          ],          ),         ),      body: Center(        child: WebviewScaffold(url: "https://sahinenes.com/",        withZoom: true,        withJavascript: true,        withLocalStorage: false,        ),),
       );
  }}

custom-web-view.dar

import 'package:flutter/material.dart';import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
class MyCustomWebview extends StatelessWidget {      final String url;    final String title;
    MyCustomWebview({@required this.url, @required this.title});
  @override  Widget build(BuildContext context) {    return Scaffold(
      body: Center(        child: WebviewScaffold(url: url,        appBar: AppBar(title: Text('Flutter Webview'),),        withZoom: true,        withJavascript: true,        withLocalStorage: false,        ),),
    
    );  }}

pubsec.yaml e bunu eklemeyi unutmayın

 sdk: flutter  
               flutter_webview_plugin: