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builder: (context, snapshot) {
if (snapshot.hasData) {
return Text(snapshot.data!.title);
} else if (snapshot.hasError) {
return Text('${snapshot.error}');
}
return const CircularProgressIndicator();
},
)<code_end>
<topic_end>
<topic_start>
Complete example
<code_start>import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
Future<Album> createAlbum(String title) async {
final response = await http.post(
Uri.parse('https://jsonplaceholder.typicode.com/albums'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'title': title,
}),
);
if (response.statusCode == 201) {
// If the server did return a 201 CREATED response,
// then parse the JSON.
return Album.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
} else {
// If the server did not return a 201 CREATED response,
// then throw an exception.
throw Exception('Failed to create album.');
}
}
class Album {
final int id;
final String title;
const Album({required this.id, required this.title});
factory Album.fromJson(Map<String, dynamic> json) {
return switch (json) {
{
'id': int id,
'title': String title,
} =>
Album(
id: id,
title: title,
),
_ => throw const FormatException('Failed to load album.'),
};
}
}
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() {
return _MyAppState();
}
}
class _MyAppState extends State<MyApp> {
final TextEditingController _controller = TextEditingController();
Future<Album>? _futureAlbum;
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Create Data Example',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: Scaffold(
appBar: AppBar(
title: const Text('Create Data Example'),
),
body: Container(
alignment: Alignment.center,
padding: const EdgeInsets.all(8),
child: (_futureAlbum == null) ? buildColumn() : buildFutureBuilder(),
),
),
);
}
Column buildColumn() {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextField(
controller: _controller,
decoration: const InputDecoration(hintText: 'Enter Title'),
),
ElevatedButton(
onPressed: () {
setState(() {
_futureAlbum = createAlbum(_controller.text);
});
},