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main.dart
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main.dart
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import 'dart:math';
import 'package:devangels_defer_init/devangels_defer_init.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyService {
MyService._();
static MyService? _instance;
static MyService get instance => _instance!;
static Future<MyService> init() async {
if (_instance == null) {
await Future.delayed(const Duration(seconds: 5));
_instance = MyService._();
}
return _instance!;
}
bool isLoggedIn() {
return Random(DateTime.now().millisecondsSinceEpoch).nextBool();
}
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
home: HomePage(),
);
}
}
class HomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: const Text('DevAngels Demo'),
),
body: DeferInit(
create: () async {
await MyService.init();
if (MyService.instance.isLoggedIn()) {
return const Center(
child: Text(
'Logged In',
),
);
} else {
return const Center(
child: Text(
'Not Logged In',
),
);
}
},
emptyWidget: const Center(
child: Text(
'No Data',
),
),
),
);
}
}