在颤动的时候我不能把抽屉放在appBar下面并在抽屉和arrow.left打开时关闭菜单图标

@override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: new Scaffold(
        body: new Scaffold(
            key: _scaffoldKey, drawer: new MyDrawer()),
        appBar: new AppBar(
          leading: new IconButton(
                        icon: icon,
            onPressed: () { _handleDrawer();
              //Scaffold.of(context).openDrawer();
            },
          ),
          automaticallyImplyLeading: true,
          title: Text('Prospectos'),
          actions: <Widget>[
            Container(
              padding: EdgeInsets.all(0.0),
              child: IconButton(
                icon: (Icon(Icons.search, color: Colors.white)),
                iconSize: 36.0,
                onPressed: null,
              ),
            ),
            Container(
              padding: EdgeInsets.all(0.0),
              child: IconButton(
                icon: (Icon(Icons.local_bar, color: Colors.white)),
                iconSize: 36.0,
                onPressed: null,
              ),
            ),
            Container(
              padding: EdgeInsets.all(0.0),
              child: IconButton(
                icon: (Icon(Icons.cached, color: Colors.white)),
                iconSize: 36.0,
                onPressed: null,
              ),
            ),
          ],
        ),
      ),
    );
  }