main.dart

class _MyHomePageState extends State<MyHomePage> {
  String _information = 'No Information Yet';

  void updateInformation(String information) {
    setState(() => _information = information);
  }

  void moveToSecondPage() async {
    final information = await Navigator.push(
      context,
      CupertinoPageRoute(
          fullscreenDialog: true, builder: (context) => SecondPage()),
    );
    updateInformation(information);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              _information,
            ),
            SizedBox(
              height: 8.0,
            ),
            RaisedButton(
              color: Colors.blue,
              child: Text(
                'Get Information',
                style: TextStyle(color: Colors.white),
              ),
              onPressed: () {
                moveToSecondPage();
              },
            )
          ],
        ),
      ), 
    );
  }
}