import 'package:flutter/material.dart';

class Sayfa1 extends StatefulWidget {
@override
_Sayfa1State createState() => _Sayfa1State();
}

class _Sayfa1State extends State<Sayfa1> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: FlatButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Sayfa2(sayi: 5),
),
);
},
child: Text("Gönder"),
),
),
);
}
}

class Sayfa2 extends StatefulWidget {
final int sayi;

const Sayfa2({Key key, this.sayi}) : super(key: key);
@override
_Sayfa2State createState() => _Sayfa2State();
}

class _Sayfa2State extends State<Sayfa2> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text("Gönderdiğin rakam"),
);
}
}