To apply the repository pattern in a Flutter app that uses the jsonplaceholder API, you can follow these steps:
- Define the model: Create a model class that represents the data you’ll be working with. For example, if you’re using the jsonplaceholder API to retrieve posts, you could create a
Post
class with properties likeid
,title
, andbody
.
class Post {
final int id;
final String title;
final String body;
Post({required this.id, required this.title, required this.body});
}
- Create the repository: Create a repository class that encapsulates the logic for retrieving data from the API. The repository should have a method for each operation you need to perform (e.g.
getPosts
,getPostById
, etc.). These methods should returnFuture
objects that resolve to the appropriate data types.
import 'package:http/http.dart' as http;
import 'dart:convert';
class PostRepository {
final String apiUrl = "https://jsonplaceholder.typicode.com/posts";
Future<List<Post>> getPosts() async {
var response = await http.get(Uri.parse(apiUrl));
if (response.statusCode == 200) {
List<dynamic> body = json.decode(response.body);
List<Post> posts = body.map((post) => Post.fromJson(post)).toList();
return posts;
} else {
throw "Failed to get posts";
}
}
Future<Post> getPostById(int id) async {
var response = await http.get(Uri.parse('$apiUrl/$id'));
if (response.statusCode == 200) {
dynamic body = json.decode(response.body);
Post post = Post.fromJson(body);
return post;
} else {
throw "Failed to get post";
}
}
}
Note that the PostRepository
class makes use of the http
package to make HTTP requests to the jsonplaceholder API.
- Use the repository in your app: Finally, you can use the repository in your app to retrieve data from the API. For example, you could create a
PostList
widget that displays a list of posts:
class PostList extends StatefulWidget {
@override
_PostListState createState() => _PostListState();
}
class _PostListState extends State<PostList> {
late Future<List<Post>> _postsFuture;
@override
void initState() {
super.initState();
_postsFuture = PostRepository().getPosts();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Posts'),
),
body: FutureBuilder<List<Post>>(
future: _postsFuture,
builder: (BuildContext context, AsyncSnapshot<List<Post>> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasData) {
return ListView.builder(
itemCount: snapshot.data!.length,
itemBuilder: (BuildContext context, int index) {
Post post = snapshot.data![index];
return ListTile(
title: Text(post.title),
subtitle: Text(post.body),
);
},
);
} else if (snapshot.hasError) {
return Text("${snapshot.error}");
}
}
return Center(child: CircularProgressIndicator());
},
),
);
}
}
In this example, the PostList
widget uses the PostRepository
to retrieve a list of posts, and displays them in a ListView
. The FutureBuilder
widget is used to handle the asynchronous loading of data from the API.
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