前言
在app开发中我们有JSBridge来实现app和网页端通讯,现参考JSBridge实现了Flutter webview和网页端通讯。
预览
flutter
import 'package:ds_bridge/ds_bridge.dart'; class JsBridgeUtil { // 向H5调用接口 static executeMethod(flutterWebViewPlugin, String jsonStr) async{ DsBridge dsBridge = DsBridge(flutterWebViewPlugin); Result result = dsBridge.dispatch(jsonStr); if(result.method == 'share'){ result.callBack('收到网页端share事件,内容为${result.data}并返回此文本给网页'); } if(result.method == 'share1'){ result.callBack('收到网页端share1事件'); } } }
网页
import 'dsbridge_flutter' dsBridge.call('share', { name: 'woyehaizaixiang' }, function (res) { alert(res) })
具体实现
flutter中使用ds_bridge
此包是flutter_webview_pluginwebview与网页交互的工具包,需要先添加flutter_webview_plugin组件,具体flutter_webview_plugin组件使用请前往官网查看 ,在添加flutter_webview_plugin组件后,添加ds_bridge组件
1.配置依赖包
dependencies: ds_bridge: ^0.0.1
2.在webview页面添加JavascriptChannel
webview.dart
import 'dart:async'; import 'package:flutter/material.dart'; import 'package:yundk_app/routes/application.dart'; import 'package:flutter_webview_plugin/flutter_webview_plugin.dart'; import '../../utils/JsBridgeUtil.dart'; class WebviewPage extends StatefulWidget { final String url; final VoidCallback backCallback; WebviewPage({ Key key, @required this.url, this.backCallback, }) : super(key: key); @override _WebviewPageState createState() => _WebviewPageState(); } class _WebviewPageState extends State<WebviewPage> { String _title = "'; final flutterWebViewPlugin = FlutterWebviewPlugin(); final Set<JavascriptChannel> jsChannels = [ JavascriptChannel( name: "DsBridgeApp', onMessageReceived: (JavascriptMessage msg) { String jsonStr = msg.message; JsBridgeUtil.executeMethod(FlutterWebviewPlugin(), jsonStr); }), ].toSet(); StreamSubscription<String> _onUrlChanged; @override void initState() { super.initState(); flutterWebViewPlugin.close(); // 监听 url changed _onUrlChanged = flutterWebViewPlugin.onUrlChanged.listen((String url) async { }); // 监听页面onload flutterWebViewPlugin.onStateChanged.listen((viewState) async { if (viewState.type == WebViewState.finishLoad) { flutterWebViewPlugin.evalJavascript('document.title').then((result) => { setState(() { _title = result; }) }); } }); } @override void dispose() { _onUrlChanged.cancel(); flutterWebViewPlugin.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( body: WebviewScaffold( appBar: new AppBar( leading: IconButton( hoverColor: Colors.transparent, highlightColor: Colors.transparent, icon: Icon(const IconData(0xe61b, fontFamily: 'IconFont'), color: Color(0xff333333), size: 18), onPressed: (){ flutterWebViewPlugin.close(); Application.router.pop(context); }, ), title: new Text( _title, style: TextStyle(color: Color(0xff333333), fontSize: 17), ), actions: [ new IconButton( icon: new Icon( Icons.refresh_outlined, color: Color(0xff333333), size: 20 ), onPressed: () { flutterWebViewPlugin.reload(); } ), ], centerTitle: true, elevation: 0, ), url: widget.url, javascriptChannels: jsChannels, mediaPlaybackRequiresUserGesture: false, withZoom: true, withLocalStorage: true, hidden: true, ) ); } }
3.在JsBridgeUtil类中
utils/JsBridgeUtil.dart
import 'package:ds_bridge/ds_bridge.dart'; class JsBridgeUtil { // 向H5调用接口 static executeMethod(flutterWebViewPlugin, String jsonStr) async{ DsBridge dsBridge = DsBridge(flutterWebViewPlugin); Result result = dsBridge.dispatch(jsonStr); if(result.method == 'share'){ result.callBack('收到网页端share事件,内容为${result.data}并返回此文本给网页'); } if(result.method == 'share1'){ result.callBack('收到网页端share1事件'); } } }
网页端使用dsbridge_flutter
此插件为网页端插件,配合flutter端ds_bridge一起使用
1.安装
npm install dsbridge_flutter
2.使用
import 'dsbridge_flutter' dsBridge.call(<String> method, <Object> data, <Function> callback)
3.例子
import 'dsbridge_flutter' dsBridge.call('share', { name: 'woyehaizaixiang' }, function (res) { alert(res) })
总结
本文参考JSBridge实现了Flutter webview和网页端交互。具体用到的插件有Flutter端flutter_webview_plugin和ds_bridge、网页端有dsbridge_flutter。
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