first_screen.dart

@override
  Widget build(BuildContext context) {
    return new Container(
      color: Colors.white,
      child: Column(
        children: <Widget>[
          Spacer(),
          Hero( /// Hero
            tag: 'logo',
            child: Image.asset('images/icon_like.png'), /// This is the flying widget
          ),
          Spacer(),
          MaterialButton(child: Text('Next Screen'),
          textColor: Colors.white,
          color: Colors.blue,
            minWidth: 200.0,
            onPressed: _nextScreen,
          )
        ],
      ),
    );
  }