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Simple provider example
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import 'package:flutter/material.dart'; | |
import 'package:flutter_bloc/blocs/featured_post_bloc.dart'; | |
import 'package:provider/provider.dart'; | |
import 'package:flutter_bloc/widgets/refresh.dart'; | |
class FeaturedPostPage extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
final FeaturedPostBloc featuredPostBloc = | |
Provider.of<FeaturedPostBloc>(context); | |
if (featuredPostBloc.posts.length == 0) { | |
featuredPostBloc.fetchPosts(); // It works but throws errors. | |
} | |
return Container( | |
child: Center( | |
child: Column( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: <Widget>[ | |
featuredPostBloc.isLoading | |
? CircularProgressIndicator() | |
: Text( | |
featuredPostBloc.posts.length.toString(), | |
style: TextStyle(fontSize: 62.0), | |
), | |
RefreshButton(), | |
], | |
), | |
), | |
); | |
} | |
} |
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import 'package:flutter/material.dart'; | |
import 'package:flutter_bloc/models/post.dart'; | |
import 'dart:convert'; | |
import 'package:http/http.dart' as http; | |
Future<List<Post>> _fetchPosts() async { | |
final response = await http.get('https://api.kodilan.com/posts?get=25'); | |
if (response.statusCode == 200) { | |
var body = json.decode(response.body); | |
List<Object> list = body["data"]; | |
return list.map((item) => Post.fromJson(item)).toList(); | |
} else { | |
throw Exception('Failed to load post'); | |
} | |
} | |
class FeaturedPostBloc extends ChangeNotifier { | |
List<Post> _posts = []; | |
bool _isLoading = false; | |
bool _hasError = false; | |
bool get hasError => _hasError; | |
bool get isLoading => _isLoading; | |
List<Post> get posts => _posts; | |
set isLoading(bool isLoading) { | |
_isLoading = isLoading; | |
notifyListeners(); | |
} | |
set hasError(bool hasError) { | |
_hasError = hasError; | |
notifyListeners(); | |
} | |
set posts(List<Post> posts) { | |
_posts = posts; | |
notifyListeners(); | |
} | |
fetchPosts() async { | |
isLoading = true; | |
hasError = false; | |
try { | |
posts = await _fetchPosts(); | |
} catch (e) { | |
print(e); | |
hasError = true; | |
} finally { | |
isLoading = false; | |
} | |
} | |
} |
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