Error when pulling data from firestore using streambuilder - firebase

Question

I am trying to pull data from my firestore database using flutter but am getting the below error:
type 'String' is not a subtype of type 'ImageProvider'
I am using stream builder and have defined the class but it does not seem to be recognising the image that I need to pull. Below is all the code I have used for my stream builder.
firestore database
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'dart:ui' as ui;
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Profile Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Profile'),
);
}
}
class Photo {
final int photourl;
final DocumentReference reference;
Photo.fromMap(Map<String, dynamic> map, {this.reference})
: photourl = map['photourl'];
Photo.fromSnapshot(DocumentSnapshot snapshot)
: this.fromMap(snapshot.data, reference: snapshot.reference);
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
final _width = MediaQuery.of(context).size.width;
final _height = MediaQuery.of(context).size.height;
return StreamBuilder<DocumentSnapshot>(
stream: Firestore.instance
.collection('users')
.document('testuser')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return Stack(
children: <Widget>[
new Container(
color: Colors.blue,
),
new Image.network(
snapshot.data['photourl'].toString(),
fit: BoxFit.fill,
),
new BackdropFilter(
filter: new ui.ImageFilter.blur(
sigmaX: 6.0,
sigmaY: 6.0,
),
child: new Container(
decoration: BoxDecoration(
color: Colors.blue.withOpacity(0.9),
borderRadius: BorderRadius.all(Radius.circular(50.0)),
),
)),
new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
centerTitle: false,
elevation: 0.0,
backgroundColor: Colors.transparent,
),
drawer: new Drawer(
child: new Container(),
),
backgroundColor: Colors.transparent,
body: new Center(
child: new Column(
children: <Widget>[
new SizedBox(
height: _height / 12,
),
new CircleAvatar(
radius: _width < _height ? _width / 4 : _height / 4,
backgroundImage: snapshot.data['photourl'],
),
new SizedBox(
height: _height / 25.0,
),
new Text(
snapshot.data['name'],
style: new TextStyle(
fontWeight: FontWeight.bold,
fontSize: _width / 15,
color: Colors.white),
),
new Padding(
padding: new EdgeInsets.only(
top: _height / 30,
left: _width / 8,
right: _width / 8),
),
new Divider(
height: _height / 15,
color: Colors.white,
),
new Row(
children: <Widget>[
rowCell(
snapshot.data['totalquestions'], 'Answers'),
rowCell('£ 673826', 'Earned'),
],
),
new Divider(
height: _height / 15, color: Colors.white),
],
),
))
],
);
} else {
return CircularProgressIndicator();
}
});
}

Answer 1

Inside your Column widget, you have included a CircleAvatar and passed in a wrong parameter to the backgroundImage property. backgroundImage takes an ImageProvider rather than a String of the photo url.
you should change this:
CircleAvatar(
radius: _width < _height ? _width / 4 : _height / 4,
backgroundImage: snapshot.data['photourl'],
),
to this:
CircleAvatar(
radius: _width < _height ? _width / 4 : _height / 4,
backgroundImage: NetworkImage(snapshot.data['photourl']),
),