import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MainPage(),
    );
  }
}

class MainPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Page 1"),
        ),
        body: Center(
          child: FloatingActionButton(
            onPressed: () {
              Navigator.push(context,
                  MaterialPageRoute(builder: (context) => SecondPage()));
            },
          ),
        ));
  }
}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Page 2"),
      ),
    );
  }
}