new MaterialApp(
      routes: {
        "/": (_) => new WebviewScaffold(
              url: "https://www.google.com",
              appBar: new AppBar(
                title: new Text("Widget webview"),
              ),
            )
      },
    );

final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.onUrlChanged.listen((String url) {
  
});

final flutterWebviewPlugin = new FlutterWebviewPlugin();  

flutterWebviewPlugin.launch(url, hidden: true);

flutterWebviewPlugin.close();

final flutterWebviewPlugin = new FlutterWebviewPlugin();  

flutterWebviewPlugin.launch(url,
                  fullScreen: false,
                  rect: new Rect.fromLTWH(
                      0.0, 
                      0.0, 
                      MediaQuery.of(context).size.width, 
                      300.0));

Future<Null> launch(String url,
         {bool withJavascript: true,
         bool clearCache: false,
         bool clearCookies: false,
         bool hidden: false,
         bool enableAppScheme: true,
         Rect rect: null,
         String userAgent: null,
         bool withZoom: false,
         bool withLocalStorage: true});

Future<String> evalJavascript(String code);

Future<Map<String, dynamic>> getCookies();

Future<Null> resize(Rect rect);

Future<Null> show();

Future<Null> hide();

Future<Null> reloadUrl(String url);