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flutter_docs

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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> {
late Future<Album> _futureAlbum;
@override
void initState() {
super.initState();
_futureAlbum = fetchAlbum();
}
@override
widget build(BuildContext context) {
return MaterialApp(
title: 'delete data example',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: scaffold(
appBar: AppBar(
title: const Text('Delete data example'),
),
body: center(
child: FutureBuilder<Album>(
future: _futureAlbum,
builder: (context, snapshot) {
// if the connection is done,
// check for response data or an error.
if (snapshot.connectionstate == ConnectionState.done) {
if (snapshot.hasdata) {
return column(
mainAxisAlignment: MainAxisAlignment.center,
children: <widget>[
text(snapshot.data?.title ?? 'deleted'),
ElevatedButton(
child: const Text('Delete data'),
onPressed: () {
setState(() {
_futureAlbum =
deleteAlbum(snapshot.data!.id.toString());
});
},
),
],
);
} else if (snapshot.haserror) {
return text('${snapshot.error}');
}
}
// by default, show a loading spinner.
return const CircularProgressIndicator();
},
),
),
),
);
}
}
<code_end>
<topic_end>
<topic_start>
communicate with WebSockets
in addition to normal HTTP requests,
you can connect to servers using WebSockets.
WebSockets allow for two-way communication with a server
without polling.
in this example, connect to a
test WebSocket server sponsored by lob.com.
the server sends back the same message you send to it.
this recipe uses the following steps:
<topic_end>
<topic_start>
1. connect to a WebSocket server
the web_socket_channel package provides the
tools you need to connect to a WebSocket server.
the package provides a WebSocketChannel
that allows you to both listen for messages
from the server and push messages to the server.