bottomnavigation.dart

class _MyHomePageState extends State<MyHomePage> {
  int _cIndex = 0;

  void _incrementTab(index) {
    setState(() {
      _cIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Center(
        child: new Column(
         
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            
          ],
        ),
      ),
      bottomNavigationBar:BottomNavigationBar(
        currentIndex: _cIndex,
        type: BottomNavigationBarType.shifting ,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.ac_unit,color: Color.fromARGB(255, 0, 0, 0)),
            title: new Text('')
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.ac_unit,color: Color.fromARGB(255, 0, 0, 0)),
            title: new Text('')
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.ac_unit,color: Color.fromARGB(255, 0, 0, 0)),
            title: new Text('')
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.access_alarm,color: Color.fromARGB(255, 0, 0, 0)),
            title: new Text('')
          )
        ],
        onTap: (index){
            _incrementTab(index);
        },
      ) 
    );
  }
}