anchor.diff: +import 'dart:async';
  +import 'dart:convert';
  +
   import 'package:flutter/material.dart';
  -
  +import 'package:flutter/services.dart';
  +import 'package:rxdart/rxdart.dart';
   
   const double _kFlexibleSpaceMaxHeight = 180.0;
   
  
positive.code:               ),
              ),
              new SliverList(
                  delegate: new SliverChildListDelegate(buildItem())
              ),
            ],
          )
      );
    }
  }
  
negative.code:   static final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<
        ScaffoldState>();
  
    List<Post> _posts = new List();
    StreamSubscription<List<Post>> _subscription;
  
    @override
    void initState() {
      super.initState();
      _subscription = _fetch();
    }
  
    @override
    void dispose() {
      super.dispose();
      _subscription.cancel();
    }
  
    StreamSubscription<List<Post>> _fetch() {
      return new Observable.fromFuture(createHttpClient().get(
          "https://ulicastefankowa.prismic.io/api/v2/documents/search?ref=WezBGSIAANl4JSMl"))
          .map((response) => JSON.decode(response.body))
          .map((json) => json["results"].map(_parsePost).toList())
          .listen((respo) =>
          setState(() {
            _posts = respo;
          }));
    }
  
    Post _parsePost(dynamic post) {
      var body = post["data"];
      var image = body["image"]["url"];
      var title = body["title"].first["text"];
      var description = body["description"].first["text"];
      return new Post(
          title: title, imageUrl: image, description: description, text: "dsfsa");
    }
  
    List<Widget> buildItem(List<Post> posts) {
      return posts.map((post) =>
      new Container(
        padding: const EdgeInsets.all(16.0),
        child: new Stack(
          alignment: Alignment.bottomLeft,
          children: <Widget>[
            new Image.network(post.imageUrl),
            new Text(post.title, style: Theme.of(context).textTheme.title),
          ],
        ),
      )).toList();
    }
  
  