title: ListView.builder Not Building Items (nothing is displayed)
body: <p>When I don't use the <code>ListView.builder</code> constructor in Flutter, the individual item is shown as expected from the JSON API:</p>
  
  <p>On the other hand, when I use <code>ListView.builder</code>, nothing shows up.</p>
  
  <p>Here's the code:</p>
  
  <pre><code> import 'dart:ui';
  import 'dart:async';
  import 'dart:convert';
  import 'package:http/http.dart'as http;
  
  import "package:flutter/material.dart";
  import 'package:flutter/painting.dart';
  Map responsee={};
  bool _loading = false;
  
  
  
  
  class tag extends StatefulWidget{
  
    Map data={};
    tag(this.data);
    @override
    State&lt;StatefulWidget&gt; createState() {
      return tagstate(data);
    }
  
  }
  
  class tagstate extends State&lt;tag&gt;{
    List influ=[{"username":"tarun"}];
  
    Map data={};
    tagstate(this.data);
  
    Future&lt;Null&gt; load()async {
  
      responsee = await getJson1(data["tag"]);
      setState(() {
        _loading = true;
        influ=responsee["influencers"];
        new Future.delayed(new Duration(seconds: 5), _login);
  
  
      });
      print('length: ${influ}');
  
    }
    Future _login() async{
      setState((){
        _loading = false;
      });
    }
  
    @override
    void initState() {
      load();
      super.initState();
  
    }
  
  
  
  
    @override
     build(BuildContext context) {
  
      var bodyProgress = new Container(
        child: new Stack(
          children: &lt;Widget&gt;[
  
            new Container(
              alignment: AlignmentDirectional.center,
              decoration: new BoxDecoration(
                color: Colors.white70,
              ),
              child: new Container(
                decoration: new BoxDecoration(
                    color: Colors.blue[200],
                    borderRadius: new BorderRadius.circular(10.0)
                ),
                width: 300.0,
                height: 200.0,
                alignment: AlignmentDirectional.center,
                child: new Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: &lt;Widget&gt;[
                    new Center(
                      child: new SizedBox(
                        height: 50.0,
                        width: 50.0,
                        child: new CircularProgressIndicator(
                          value: null,
                          strokeWidth: 7.0,
                        ),
                      ),
                    ),
                    new Container(
                      margin: const EdgeInsets.only(top: 25.0),
                      child: new Center(
                        child: new Text(
                          "loading.. wait...",
                          style: new TextStyle(
                              color: Colors.white
                          ),
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      );
  
  
      return Scaffold(
        appBar: new AppBar(iconTheme: IconThemeData(color: Colors.black),backgroundColor: Colors.white,
          title: Text("Stats",style: TextStyle(color: Colors.black,fontWeight: FontWeight.w600),),
        ),
        body:  _loading ? bodyProgress : new Column(children: &lt;Widget&gt;[
          Flexible(child: ListView.builder(padding: const EdgeInsets.all(14.5),itemCount: influ.length,itemBuilder: (BuildContext context,int pos){
            new ListTile(
              title: Text(influ[pos]["username"],style: new TextStyle(fontSize: 17.9),),
  
  
              leading: CircleAvatar(
                backgroundColor: Colors.pink,
                child: Image.network("${influ[pos]["photo"]}"),
  
              ),
  
            );
          }),)],),
  
  
      );
  
    }
  }
  Future&lt;Map&gt; getJson1(String data) async{
    String apiUrl="https://api.ritekit.com/v1/influencers/hashtag/$data?client_id=a59c9bebeb5253f830e09bd9edd102033c8fe014b976";
    http.Response response = await http.get(apiUrl);
    return json.decode(response.body);
  
  }
  </code></pre>
  
  <p>No matter how much I try, the error still persists.</p>
  
  <p>The Scaffold loads, but the <code>ListView.builder</code> doesn't.</p>
  
  <p>When I don't use the <code>ListView.builder</code>, the individual item is shown as expected from the JSON API.</p>