class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin{
  TabController controller;
  @override
  void initState(){
    super.initState();
    controller=TabController(vsync: this,length: 2);
  }
  @override
  void dispose(){
   controller.dispose();
    super.dispose();
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Tab"),
        backgroundColor: Colors.teal,
        bottom: TabBar(
          controller: controller,
          tabs: <Widget>[
            Tab(
              icon: Icon(Icons.directions_bike),
            ),
            Tab(
              icon: Icon(Icons.directions_car),
            ),
          ],
        ),
      ),
      body:TabBarView(
        controller: controller,
        children: <Widget>[
          firstpage.FirstPage(),
          secondpage.SecondPage(),
        ],
      ),
    );
  }
}