首先要安装一个插件：flutter_webview_plugin
dependencies: ?flutter_webview_plugin: ^0.2.1+2
使用方法：
new MaterialApp( ?????routes: { ???????"/": (_) => new WebviewScaffold( ?????????????url: "https://www.google.com", ?????????????appBar: new AppBar( ???????????????title: new Text("Widget webview"), ?????????????), ???????????) ?????}, ???);FlutterWebviewPlugin 插件提供一个链接到唯一webview的单一实例，这样你就可以在app中的任何地方控制webview，比如监听事件：
final flutterWebviewPlugin = new FlutterWebviewPlugin();// ?监听url地址改变事件flutterWebviewPlugin.onUrlChanged.listen((String url) { ?});// ?监听页面滚动事件
final flutterWebviewPlugin = new FlutterWebviewPlugin();flutterWebviewPlugin.onScrollYChanged.listen((double offsetY) { ??});flutterWebviewPlugin.onScrollXChanged.listen((double offsetX) { ?});
隐藏webview：
final flutterWebviewPlugin = new FlutterWebviewPlugin(); ?flutterWebviewPlugin.launch(url, hidden: true);
关闭webview：
flutterWebviewPlugin.close();
画一个内部矩形webview：
final flutterWebviewPlugin = new FlutterWebviewPlugin(); ?flutterWebviewPlugin.launch(url, ?????????????????fullScreen: false, ?????????????????rect: new Rect.fromLTWH( ?????????????????????0.0, ??????????????????????0.0, ??????????????????????MediaQuery.of(context).size.width, ??????????????????????300.0));
注意：webview并不存在于widget树中，所以你不能在webview中使用如snackbars, dialogs ...这些通知交互widget，更详细一些使用方法可以点击这里；
最后，这里是一个使用例子：
1 import ‘package:flutter/material.dart‘; 2 import ‘package:flutter_webview_plugin/flutter_webview_plugin.dart‘; 3 ?4 class WebViewExample extends StatefulWidget { 5 ??@override 6 ??_WebViewExampleState createState() => _WebViewExampleState(); 7 } 8 ?9 class _WebViewExampleState extends State<WebViewExample> {10 ??TextEditingController controller = TextEditingController();11 ??FlutterWebviewPlugin flutterWebviewPlugin = FlutterWebviewPlugin();12 ??var urlString = "https://google.com";13 14 ??launchUrl() {15 ????setState(() {16 ??????urlString = controller.text;17 ??????flutterWebviewPlugin.reloadUrl(urlString);18 ????});19 ??}20 21 ??@override22 ??void initState() {23 ????super.initState();24 25 ????flutterWebviewPlugin.onStateChanged.listen((WebViewStateChanged wvs) {26 ??????print(wvs.type);27 ????});28 ??}29 30 ??@override31 ??Widget build(BuildContext context) {32 ????return WebviewScaffold(33 ??????appBar: AppBar(34 ????????title: TextField(35 ??????????autofocus: false,36 ??????????controller: controller,37 ??????????textInputAction: TextInputAction.go,38 ??????????onSubmitted: (url) => launchUrl(),39 ??????????style: TextStyle(color: Colors.white),40 ??????????decoration: InputDecoration(41 ????????????border: InputBorder.none,42 ????????????hintText: "Enter Url Here",43 ????????????hintStyle: TextStyle(color: Colors.white),44 ??????????),45 ????????),46 ????????actions: <Widget>[47 ??????????IconButton(48 ????????????icon: Icon(Icons.navigate_next),49 ????????????onPressed: () => launchUrl(),50 ??????????)51 ????????],52 ??????),53 ??????url: urlString,54 ??????withZoom: false,55 ????);56 ??}57 }flutter中使用webview
原文地址：https://www.cnblogs.com/pjl43/p/9866753.html