路由示例

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
      title: "MaterialApp示例",
      routes: {
        '/first': (BuildContext context) => FirstPage(),
        '/second': (BuildContext context) => SecondPage()
      },
      initialRoute: '/first',
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("MaterialApp 示例"),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: () {
            Navigator.pushNamed(context, '/first');
          },
          child: Text(
            '主页',
            style: TextStyle(fontSize: 28.0),
          ),
        ),
      ),
    );
  }
}

class FirstPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("第一屏"),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: () {
            Navigator.of(context).pushNamed('/second');
          },
          child: Text('进入第二屏'),
        ),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("第二屏"),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: () {
            Navigator.of(context).pop();
          },
          child: Text('返回上一屏'),
        ),
      ),
    );
  }
}