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readme.md

Create by https://gist.github.com/CaiJingLong/a299d15b92edc2d09a8a06cf6dd5a1b0

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: HomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class HomePage extends StatelessWidget {
  final String title;
  final int level;

  const HomePage({Key key, this.title, this.level = 0}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("$title $level"),
      ),
      body: Column(
        children: <Widget>[
          RaisedButton(
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (_) {
                    return HomePage(
                      title: title,
                      level: level + 1,
                    );
                  },
                ),
              );
            },
            child: Text("next"),
          ),
          RaisedButton(
            onPressed: () {
              for (var i = 0; i < level; i++) {
                Navigator.pop(context);
              }
            },
            child: Text("to root"),
          ),
        ],
      ),
    );
  }
}