import
'dart:async'
;
import
'dart:convert'
;
import
'package:flutter/material.dart'
;
import
'package:http/http.dart'
as http;
Future<Album> fetchAlbum() async {
final response =
if
(response.statusCode == 200) {
return
Album.fromJson(json.decode(response.body));
}
else
{
throw
Exception(
'Loading album failed!'
);
}
}
Future<Album> updateAlbum(String title) async {
final http.Response response = await http.put(
headers: <String, String>{
'Content-Type'
:
'application/json; charset=UTF-8'
,
},
body: jsonEncode(<String, String>{
'title'
: title,
}),
);
if
(response.statusCode == 200) {
return
Album.fromJson(json.decode(response.body));
}
else
{
throw
Exception(
'Failed to update the album!'
);
}
}
class
Album {
final
int
id;
final String title;
Album({
this
.id,
this
.title});
factory Album.fromJson(Map<String, dynamic> json) {
return
Album(
id: json[
'id'
],
title: json[
'title'
],
);
}
}
void
main() {
runApp(MyApp());
}
class
MyApp extends StatefulWidget {
MyApp({Key key}) : super(key: key);
@override
_MyAppState createState() {
return
_MyAppState();
}
}
class
_MyAppState extends State<MyApp> {
final TextEditingController _controller = TextEditingController();
Future<Album> _futureAlbum;
@override
void
initState() {
super.initState();
_futureAlbum = getAlbum();
}
@override
Widget build(BuildContext context) {
return
MaterialApp(
title:
'Update Data'
,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: 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: InputDecoration(hintText:
'Enter Title'
),
),
RaisedButton(
child: Text(
'Update Data'
),
onPressed: () {
setState(() {
_futureAlbum = updateAlbum(_controller.text);
});
},
),
],
);
}
else
if
(snapshot.hasError) {
return
Text(
"${snapshot.error}"
);
}
}
return
CircularProgressIndicator();
},
),
),
),
);
}
}