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- import 'package:flutter/material.dart';
- void main() async {
- runApp(MyApp());
- while (true) {
- print('Do some processing e.g. sync data with server');
- const seconds = 3;
- print('...sleep for $seconds seconds');
- await Future.delayed(const Duration(seconds: seconds));
- }
- }
- class MyApp extends StatelessWidget {
- // This widget is the root of your application.
- @override
- Widget build(BuildContext context) {
- return MaterialApp(
- title: 'Flutter Demo',
- theme: ThemeData(
- primarySwatch: Colors.blue,
- ),
- home: MyHomePage(title: 'Flutter Demo Home Page'),
- );
- }
- }
- class MyHomePage extends StatefulWidget {
- MyHomePage({Key key, this.title}) : super(key: key);
- final String title;
- @override
- _MyHomePageState createState() => _MyHomePageState();
- }
- class _MyHomePageState extends State<MyHomePage> with WidgetsBindingObserver {
- int _counter = 0;
- void _incrementCounter() {
- setState(() {
- _counter++;
- });
- }
- @override
- void initState() {
- super.initState();
- WidgetsBinding.instance.addObserver(this);
- }
- @override
- void dispose() {
- WidgetsBinding.instance.removeObserver(this);
- super.dispose();
- }
- @override
- void didChangeAppLifecycleState(AppLifecycleState state) {
- super.didChangeAppLifecycleState(state);
- print('$state'.toUpperCase());
- }
- @override
- Widget build(BuildContext context) {
- return Scaffold(
- appBar: AppBar(
- title: Text(widget.title),
- ),
- body: Center(
- child: Column(
- mainAxisAlignment: MainAxisAlignment.center,
- children: <Widget>[
- Text(
- 'You have pushed the button this many times:',
- ),
- Text(
- '$_counter',
- style: Theme.of(context).textTheme.display1,
- ),
- ],
- ),
- ),
- floatingActionButton: FloatingActionButton(
- onPressed: _incrementCounter,
- tooltip: 'Increment',
- child: Icon(Icons.add),
- ),
- );
- }
- }
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