flutter的webview案例

绝地灬酷狼 2021-09-17 08:58 323阅读 0赞

flutter 加载webview

安装插件  flutter\_webview\_plugin: ^0.2.1

从listview点击item跳转页面加载详情页案例

import 'dart:async';
    import 'package:flutter/cupertino.dart';
    import 'package:flutter/material.dart';
    import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
    
    /**
     * @Description  新闻网页，h5
     * @Author  zhibuyu
     * @Date 2018/10/19  9:09
     * @Version  1.0
     */
    class NewsWebPage extends StatefulWidget{
      String  news_url;
      String title;
    
      NewsWebPage(this.news_url,this.title);
    
      @override
      State<StatefulWidget> createState()=>new NewsWebPageState(news_url,title);
    
    }
    class NewsWebPageState extends State<NewsWebPage>{
      String  news_url;
      String title;
      // 标记是否是加载中
      bool loading = true;
      // 标记当前页面是否是我们自定义的回调页面
      bool isLoadingCallbackPage = false;
      GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey();
      // URL变化监听器
      StreamSubscription<String> onUrlChanged;
      // WebView加载状态变化监听器
      StreamSubscription<WebViewStateChanged> onStateChanged;
      // 插件提供的对象，该对象用于WebView的各种操作
      FlutterWebviewPlugin flutterWebViewPlugin = new FlutterWebviewPlugin();
    
      NewsWebPageState(this.news_url, this.title);
    
      @override
      void initState() {
        onStateChanged = flutterWebViewPlugin.onStateChanged.listen((WebViewStateChanged state){
          // state.type是一个枚举类型，取值有：WebViewState.shouldStart, WebViewState.startLoad, WebViewState.finishLoad
          switch (state.type) {
            case WebViewState.shouldStart:
            // 准备加载
              setState(() {
                loading = true;
              });
              break;
            case WebViewState.startLoad:
            // 开始加载
              break;
            case WebViewState.finishLoad:
            // 加载完成
              setState(() {
                loading = false;
              });
              if (isLoadingCallbackPage) {
                // 当前是回调页面，则调用js方法获取数据
                parseResult();
              }
              break;
          }
        });
      }
      // 解析WebView中的数据
      void parseResult() {
    //    flutterWebViewPlugin.evalJavascript("get();").then((result) {
    //      // result json字符串，包含token信息
    //
    //    });
      }
    
      @override
      Widget build(BuildContext context) {
        List<Widget> titleContent = [];
        titleContent.add(new Text(
         title,
          style: new TextStyle(color: Colors.white),
        ));
        if (loading) {
          // 如果还在加载中，就在标题栏上显示一个圆形进度条
          titleContent.add(new CupertinoActivityIndicator());
        }
        titleContent.add(new Container(width: 50.0));
        // WebviewScaffold是插件提供的组件，用于在页面上显示一个WebView并加载URL
        return new WebviewScaffold(
          key: scaffoldKey,
          url:news_url, // 登录的URL
          appBar: new AppBar(
            title: new Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: titleContent,
            ),
            iconTheme: new IconThemeData(color: Colors.white),
          ),
          withZoom: true,  // 允许网页缩放
          withLocalStorage: true, // 允许LocalStorage
          withJavascript: true, // 允许执行js代码
        );
      }
    
      @override
      void dispose() {
        // 回收相关资源
        // Every listener should be canceled, the same should be done with this stream.
        onUrlChanged.cancel();
        onStateChanged.cancel();
        flutterWebViewPlugin.dispose();
        super.dispose();
      }
    }

在跳转的地方调用

Navigator.of(widget.parentContext).push(

new MaterialPageRoute(builder: (context) \{

return new NewsWebPage(link,tiltes,);//link,title为需要传递的参数

\},

));

转载于子不语大大的[https://blog.csdn.net/u010123643/article/details/83379231][https_blog.csdn.net_u010123643_article_details_83379231]

[https_blog.csdn.net_u010123643_article_details_83379231]: https://blog.csdn.net/u010123643/article/details/83379231