Flutter WebView组件flutter_inappbrowser加载远程web页面

Flutter WebView组件inappbrowser的使用 https://pub.dev/packages/flutter_inappbrowser 注意事项：

Dart sdk: ">=2.1.0-dev.7.1 <3.0.0"
Flutter: ">=0.10.1 <2.0.0"
Android: minSdkVersion 17
iOS: --ios-language swift

完整代码：

import 'package:flutter/material.dart';

import 'package:flutter_inappbrowser/flutter_inappbrowser.dart';


class NewsContent extends StatefulWidget {

  Map arguments;
  NewsContent({Key key,this.arguments}) : super(key: key);

  _NewsContentState createState() => _NewsContentState(this.arguments);
}

class _NewsContentState extends State<NewsContent> {
  Map arguments;
  bool _flag=true;

  _NewsContentState(this.arguments);
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    print(this.arguments);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("新闻详情")
      ),
      body:Column(
        children: <Widget>[
          this._flag?_getMoreWidget():Text(""),
          Expanded(
            child: InAppWebView(
                    initialUrl: "http://www.phonegap100.com/newscontent.php?aid=${this.arguments["aid"]}",                   
                    onProgressChanged: (InAppWebViewController controller, int progress) {
                        print(progress/100);
                        if((progress/100)>0.999){
                          setState(() {
                             this._flag=false;
                          });
                        }
                    },
            ),
             
          )
        ],
      )
    );
  }
  //加载中的圈圈
  Widget _getMoreWidget() {

  
      return Center(
        child: Padding(
          padding: EdgeInsets.all(10.0),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              Text(
                '加载中...',
                style: TextStyle(fontSize: 16.0),
              ),
              CircularProgressIndicator(
                strokeWidth: 1.0,
              )
            ],
          ),
        ),
      );    
  }
}