import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
Future<Album> fetchAlbum() async {
final response = await http
.get(Uri.parse('https://jsonplaceholder.typicode.com/albums/1'));
// Dispatch action depending upon
//the server response
if (response.statusCode == 200) {
return Album.fromJson(json.decode(response.body));
} else {
throw Exception('Failed to load album');
}
}
Future<Album> updateAlbum(String title) async {
final http.Response response = await http.put(
Uri.parse('https://jsonplaceholder.typicode.com/albums/1'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'title': title,
}),
);
// parsing JSOn or throwing an exception
if (response.statusCode == 200) {
return Album.fromJson(json.decode(response.body));
} else {
throw Exception('Failed to update album.');
}
}
class Album {
final int id;
final String title;
Album({required this.id, required this.title});
factory Album.fromJson(Map<String, dynamic> json) {
return Album(
id: json['id'],
title: json['title'],
);
}
}
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
// ignore: library_private_types_in_public_api
_MyAppState createState() {
return _MyAppState();
}
}
class _MyAppState extends State<MyApp> {
final TextEditingController _controller = TextEditingController();
late Future<Album> _futureAlbum;
@override
void initState() {
super.initState();
_futureAlbum = fetchAlbum();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Update Data Example',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: const Text('GeeksForGeeks'),
backgroundColor: Colors.green,
),
body: Container(
alignment: Alignment.center,
padding: const EdgeInsets.all(8.0),
child: FutureBuilder<Album>(
future: _futureAlbum,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasData) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(snapshot.data!.title),
TextField(
controller: _controller,
decoration:
const InputDecoration(hintText: 'Enter Title'),
),
ElevatedButton(
child: const Text('Update Data'),
onPressed: () {
setState(() {
_futureAlbum = updateAlbum(_controller.text);
});
},
)
// RaisedButton is deprecated and should not be used.
// Use ElevatedButton instead.
// RaisedButton(
// child: const Text('Update Data'),
// onPressed: () {
// setState(() {
// _futureAlbum = updateAlbum(_controller.text);
// });
// },
// ),
],
);
} else if (snapshot.hasError) {
return Text("${snapshot.error}");
}
}
return const CircularProgressIndicator();
},
),
),
),
);
}
}