import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:webview_flutter/webview_flutter.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: ParentWidget(),
    );
  }
}

class ParentWidget extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => ParentWidgetState();
}

class ParentWidgetState extends State<ParentWidget> {
  final Completer<WebViewController> _webViewController =
  Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Welcome to Flutter'),
      ),
      body: WebView(
        initialUrl: 'https://www.xiaoe-tech.com',
        javascriptMode: JavascriptMode.unrestricted,
        onWebViewCreated: (webViewController) {
          _webViewController.complete(webViewController);
        },
      ),
      floatingActionButton: FutureBuilder<WebViewController>(
        future: _webViewController.future,
        builder: (ctx, webViewController) {
          if (webViewController.hasData) {
            return FloatingActionButton(
              child: Icon(Icons.add),
              onPressed: () {
                webViewController.data.loadUrl('http://www.baidu.com');
              },
            );
          }

          return Container();
        },
      ),
    );
  }
}