how to load Json to flutter listview - json

Question

I'm new to flutter and I'm developing a flutter app where I have to show in a listView the data on the database.
I get the data in JSON format.
{
"data": [
{
"id": “1”,
"testo": "Fare la spesa",
"stato": "1"
},
{
"id": “2”,
"testo": "Portare fuori il cane",
"stato": "1"
},
{
"id": “3”,
"testo": “jhon”,
"stato": "0"
}
]
}
The problem is that I don't load the data, I can't understand how to do it.
I should read 'Data' with an array but I don't know how to do it.
Can anyone help me figure out how to do it?
Thanks for your help.
PS. I tried this tutorial
Main.dart
Future<Post> fetchPost() async {
final response =
await http.get('http://simone.fabriziolerose.it/index.php/Hello/dispdataflutter');
if (response.statusCode == 200) {
// If the call to the server was successful, parse the JSON.
return Post.fromJson(json.decode(response.body));
} else {
// If that call was not successful, throw an error.
throw Exception('Failed to load post');
}
}
class Post {
final int id;
final String title;
final String body;
Post({ this.id, this.title, this.body});
factory Post.fromJson(Map<String, dynamic> json) {
return Post(
id: json['id'],
title: json['testo'],
body: json['stato'],
);
}
}
void main() => runApp(MyApp(post: fetchPost()));
class MyApp extends StatelessWidget {
final Future<Post> post;
MyApp({Key key, this.post}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Fetch Data Example',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: Text('Fetch Data Example'),
),
body: Center(
child: FutureBuilder<Post>(
future: post,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text(snapshot.data.title);
} else if (snapshot.hasError) {
return Text("${snapshot.error}");
}
// By default, show a loading spinner.
return CircularProgressIndicator();
},
),
),
),
);
}
}

Answer 1

I'd rather return List of Post from fetchPost(), like below :
Future<List<Post>> fetchPost() async {
final response = await http.get('http://simone.fabriziolerose.it/index.php/Hello/dispdataflutter');
if (response.statusCode == 200) {
List responseList = json.decode(response.body);
return responseList.map((data)=>Post.fromJson(data)).toList();
} else {
// If that call was not successful, throw an error.
throw Exception('Failed to load post');
}
}
and use ListView.builder instead like this
List<Post> post;
child: ListView.builder(
itemCount: post.length,
physics: BouncingScrollPhysics(),
padding: EdgeInsets.all(0),
itemBuilder: (context, index){
return ListAdapter(
id: post[index].id,
title: post[index].title,
body: post[index].body
);
},
)