import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      home: new FirstScreen(),
    );
  }
}

class FirstScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('第一个页面'),
        backgroundColor: Colors.red,
      ),
      body: new Center(
        child: new RaisedButton(onPressed: (){
          Navigator.push(context, new MaterialPageRoute(builder: (context) => new SecondScreen()),);
        },
        child: new Text('跳转'),),
      ),
    );
  }
}


class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('第二个页面'),
        backgroundColor: Colors.brown,
      ),
      body: new Center(
        child: new RaisedButton(onPressed: (){
          Navigator.pop(context);
        },
        child: new Text('返回'),),
      ),
    );
  }
}