3 RunApp in one app

3_runapp.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

void stamp(String s) => print('${DateTime.now()} | $s');

void main() async {
  AwaitState();
  stamp('MyApp2');
  runApp(MyApp2());

  stamp('WaitState.instance.hasPermissionsFinish');
  await AwaitState.instance.hasPermissionsFinish();
  
  stamp('MyApp2');
  runApp(MyApp2());
  
  stamp('WaitState.instance.hasTapumeSOFinish');
  await AwaitState.instance.hasTapumeSOFinish();

  stamp('MyApp');
  runApp(MyApp());
}

class AwaitState {
  static AwaitState instance = AwaitState();

  int _next = 0;

  void setNext() {
    _next++;
  }

  Future<void> hasPermissionsFinish() async {
    while (!(_next == 1)) {
      await Future.delayed(const Duration(milliseconds: 500));
    }
  }

  Future<void> hasTapumeSOFinish() async {
    while (!(_next == 2)) {
      await Future.delayed(const Duration(milliseconds: 500));
    }
  }
}


class MyApp2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHome2Page(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHome2Page extends StatefulWidget {
  final String title;

  const MyHome2Page({
    Key? key,
    required this.title,
  }) : super(key: key);

  @override
  State<MyHome2Page> createState() => _MyHome2PageState();
}

class _MyHome2PageState extends State<MyHome2Page> {
  void _incrementCounter() {
    AwaitState.instance.setNext();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: const [
            Text('Ao favoritar voce passa pra proxima tela em 5s:'),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.favorite),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  const MyHomePage({
    Key? key,
    required this.title,
  }) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}