flutter multi app

main.dart

import 'dart:async';
import 'dart:ui' as ui;
import 'package:flutter/material.dart';

import './app01.dart' as App01;
import './app02.dart' as App02;

void interceptOnPointerDataPacket(Function callback) {
  var _onPointerDataPacket = ui.window.onPointerDataPacket;
  int _upEventCount = 0;

  ui.window.onPointerDataPacket = (ui.PointerDataPacket packet) {
    Timer delayCleatUpTimer;
    _onPointerDataPacket(packet);

    _upEventCount += packet.data
        .where((datum) => datum.change == ui.PointerChange.up)
        .length;

    if (_upEventCount >= 3) {
      _upEventCount = 0;
      runApp(AppListWidget());
      callback();
    } else {
      delayCleatUpTimer?.cancel();
      delayCleatUpTimer =
          Timer(Duration(milliseconds: 100), () => _upEventCount = 0);
    }
  };
}

void main() {
  runApp(AppListWidget());
  interceptOnPointerDataPacket(() => runApp(AppListWidget()));
}

Map<String, Function> appMap = {
  'App01': () => App01.MyApp(),
  'App02': () => App02.MyApp(),
};

class AppListWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "Flutter App List",
      theme: ThemeData(primaryColor: Colors.deepPurple),
      home: Scaffold(
        body: ListView(
          children: appMap.entries.map((entry) {
            return ListTile(
              title: Text(entry.key),
              onTap: () => runApp(entry.value()),
            );
          }).toList(),
        ),
      ),
      showPerformanceOverlay: false,
    );
  }
}