1)
2) home_screen.dart
import 'dart:math';
import 'package:flutter/material.dart';
class HomeScreen extends StatefulWidget {
const HomeScreen({Key? key}) : super(key: key);
@override
State<HomeScreen> createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
@override
Widget build(BuildContext context) {
final textStyle = TextStyle(
fontSize: 16.0,
);
return Scaffold(
body: Padding(
padding: const EdgeInsets.all(8.0),
child: StreamBuilder<int>(
stream: streamNumbers(),
builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Text(
'FutureBuilder',
style: textStyle.copyWith(
fontWeight: FontWeight.w700, fontSize: 20.0),
),
Text(
'ConState : ${snapshot.connectionState}',
style: textStyle,
),
Text(
'Data : ${snapshot.data}',
style: textStyle,
),
Text(
'Error : ${snapshot.error}',
style: textStyle,
),
ElevatedButton(
onPressed: () {
setState(() {});
},
child: Text(
'SetState',
),
),
],
);
},
),
),
);
}
Future<int> getNumber() async {
await Future.delayed(Duration(seconds: 3));
final random = Random();
return random.nextInt(100);
}
Stream<int> streamNumbers() async* {
for (int i = 0; i < 10; i++) {
if (i == 5) {
throw Exception('i = 5');
}
await Future.delayed(Duration(seconds: 1));
yield i;
}
}
}
3)
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