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flutter create monitor_app cd monitor_app import 'package:flutter/material.dart'; import 'dart:async';

void main() { runApp(MyApp()); }

class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Monitor App', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(), ); } }

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

class _MyHomePageState extends State { int _counter = 0; Timer? _timer;

@override void initState() { super.initState(); _startTimer(); }

void _startTimer() { _timer = Timer.periodic(Duration(seconds: 1), (Timer timer) { setState(() { _counter++; }); }); }

@override void dispose() { _timer?.cancel(); super.dispose(); }

@override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Monitor App'), ), body: Center( child: Text( 'Counter: $_counter', style: Theme.of(context).textTheme.headline4, ), ), ); } } flutter run