Image not loading from firestore in flutter app
I am very new to Flutter and Firestore. So I uploaded some photos on Firebase storage.Here is how storage looks
Then I pasted their download URL into firestore database.Here is how firestore looks
but every time I try to get them in my app I am getting the following error
════════ Exception caught by widgets library ═══════════════════════════════════ 'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 26 pos 14: 'url!= null': is not true. The relevant error-causing widget was FutureBuilderBut other data is reading and showing up in the widget. here is my code:
import 'package:flutter/material.dart';
import 'package:hexcolor/hexcolor.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:dotted_line/dotted_line.dart';
class CourseList extends StatefulWidget {
@override
_CourseListState createState() => _CourseListState();
}
class _CourseListState extends State<CourseList> {
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: FirebaseFirestore.instance
.collection('students')
.doc(FirebaseAuth.instance.currentUser.uid)
.get(),
builder: (BuildContext context, snapshot) {
if (snapshot.hasData) {
Map<String, dynamic> documentFields = snapshot.data.data();
return ListView(
shrinkWrap: true,
children: [
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Stack(
overflow: Overflow.visible,
children: [
Positioned(
// top: 0,
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 10, 0, 0),
child: Container(
width: 430,
height: 230,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/hero.png"),
fit: BoxFit.cover,
),
),
),
),
),
Positioned(
top: 200,
left: 20,
right: 20,
child: Card(
color: Hexcolor('#3B3E43'),
elevation: 10,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
child: Padding(
padding: const EdgeInsets.all(15),
child: Column(
children: [
Text(
'Welcome to Class Information System',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.white,
fontFamily: 'ProductSans',
fontSize: 16,
fontWeight: FontWeight.bold,
),
),
SizedBox(
height: 10,
),
Text(
'UTM Class Management system offers UTM students a varity of features such as, managing and making real time class schedule, finding class venue with dynamic maps and finding all the lecturers office, phone and email all at one place!',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.grey[300],
fontFamily: 'ProductSans',
fontSize: 11,
),
),
SizedBox(
height: 15,
),
Column(
children: [
Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
Image.asset(
'assets/001-school.png',
scale: 8,
),
SizedBox(
width: 0,
),
Image.asset(
'assets/002-teacher.png',
scale: 8,
),
SizedBox(
width: 0,
),
Image.asset(
'assets/003-calendar.png',
scale: 8,
),
],
),
SizedBox(
height: 10,
),
Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
Text(
'Finding class\nvenue with\ndynamic maps',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.grey[300],
fontFamily: 'ProductSans',
fontSize: 10,
),
),
Text(
'Finding all the\nlecturers informations\nat one place!',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.grey[300],
fontFamily: 'ProductSans',
fontSize: 10,
),
),
Text(
'Make & Edit\nreal time\nclass schedule',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.grey[300],
fontFamily: 'ProductSans',
fontSize: 10,
),
),
],
),
],
)
],
),
),
),
),
],
),
SizedBox(
height: 220,
),
Padding(
padding: const EdgeInsets.fromLTRB(25, 10, 0, 0),
child: Text(
'Courses Taken',
textAlign: TextAlign.left,
style: TextStyle(
color: Hexcolor('#E69405'),
fontFamily: 'ProductSans',
fontSize: 18,
),
),
),
Padding(
padding: const EdgeInsets.fromLTRB(25, 10, 25, 5),
child: DottedLine(
direction: Axis.horizontal,
lineLength: double.infinity,
lineThickness: 1.0,
dashLength: 4.0,
dashColor: Hexcolor('#707070'),
dashRadius: 0.0,
dashGapLength: 6.0,
dashGapColor: Colors.transparent,
dashGapRadius: 0.0,
),
),
SizedBox(
height: 15,
),
Card(
color: Hexcolor('#3B3E43'),
elevation: 10,
margin: EdgeInsets.fromLTRB(25, 0, 25, 20),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
child: Padding(
padding: const EdgeInsets.all(15),
child: ListView(
physics: ClampingScrollPhysics(),
shrinkWrap: true,
children: [
Row(
children: [
Expanded(
child: Padding(
padding:
const EdgeInsets.fromLTRB(10, 0, 0, 0),
child: CircleAvatar(
backgroundImage:
NetworkImage(documentFields['img1']),
radius: 28,
),
),
),
Expanded(
flex: 4,
child: Padding(
padding:
const EdgeInsets.fromLTRB(20, 0, 0, 0),
child: RichText(
text: TextSpan(
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 17,
),
text: documentFields['course1'],
children: <TextSpan>[
TextSpan(
text:
'\nSection: ${documentFields['section1']}',
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 14,
color: Colors.grey[400],
),
),
],
),
),
),
),
],
),
SizedBox(
height: 15,
),
DottedLine(
direction: Axis.horizontal,
lineLength: double.infinity,
lineThickness: 1.0,
dashLength: 10,
dashColor: Hexcolor('#707070'),
dashRadius: 0.0,
dashGapLength: 0,
dashGapColor: Colors.transparent,
dashGapRadius: 0.0,
),
SizedBox(
height: 15,
),
Row(
children: [
Expanded(
child: Padding(
padding:
const EdgeInsets.fromLTRB(10, 0, 0, 0),
child: CircleAvatar(
child: Image.network(
'${documentFields['img2']}'),
radius: 28,
),
),
),
Expanded(
flex: 4,
child: Padding(
padding:
const EdgeInsets.fromLTRB(20, 0, 0, 0),
child: RichText(
text: TextSpan(
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 17,
),
text: documentFields['course2'],
children: <TextSpan>[
TextSpan(
text:
'\nSection: ${documentFields['section2']}',
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 14,
color: Colors.grey[400],
),
),
],
),
),
),
),
],
),
SizedBox(
height: 15,
),
DottedLine(
direction: Axis.horizontal,
lineLength: double.infinity,
lineThickness: 1.0,
dashLength: 10,
dashColor: Hexcolor('#707070'),
dashRadius: 0.0,
dashGapLength: 0,
dashGapColor: Colors.transparent,
dashGapRadius: 0.0,
),
SizedBox(
height: 15,
),
Row(
children: [
Expanded(
child: Padding(
padding:
const EdgeInsets.fromLTRB(10, 0, 0, 0),
child: CircleAvatar(
child: Image.network(
'${documentFields['img3']}'),
radius: 28,
),
),
),
Expanded(
flex: 4,
child: Padding(
padding:
const EdgeInsets.fromLTRB(20, 0, 0, 0),
child: RichText(
text: TextSpan(
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 17,
),
text: documentFields['course3'],
children: <TextSpan>[
TextSpan(
text:
'\nSection: ${documentFields['section3']}',
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 14,
color: Colors.grey[400],
),
),
],
),
),
),
),
],
),
SizedBox(
height: 15,
),
DottedLine(
direction: Axis.horizontal,
lineLength: double.infinity,
lineThickness: 1.0,
dashLength: 10,
dashColor: Hexcolor('#707070'),
dashRadius: 0.0,
dashGapLength: 0,
dashGapColor: Colors.transparent,
dashGapRadius: 0.0,
),
SizedBox(
height: 15,
),
Row(
children: [
Expanded(
child: Padding(
padding:
const EdgeInsets.fromLTRB(10, 0, 0, 0),
child: CircleAvatar(
child: Image.network(
'${documentFields['img4']}'),
radius: 28,
),
),
),
Expanded(
flex: 4,
child: Padding(
padding:
const EdgeInsets.fromLTRB(20, 0, 0, 0),
child: RichText(
text: TextSpan(
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 17,
),
text: documentFields['course4'],
children: <TextSpan>[
TextSpan(
text:
'\nSection: ${documentFields['section4']}',
style: TextStyle(
fontFamily: 'ProductSans',
fontSize: 14,
color: Colors.grey[400],
),
),
],
),
),
),
),
],
),
],
),
),
)
],
),
],
);
}
return Center(child: CircularProgressIndicator());
},
);
}
}
Any help will be really appreciated. Thanks!
2 ответа
Итак, я наконец-то разобрался. Если кто-то ищет ответ. Все, что вам нужно сделать, это после сохранения изображения в хранилище firebase скопировать место хранения, а не URL-адрес загрузки, а затем поместить его в хранилище firestore. Затем используйте пакет поставщика изображений firebase, чтобы вызвать его в своем приложении.
child: ListTile(
leading: CircleAvatar(
radius: 25,
backgroundImage: FirebaseImage(coffee.img),
),
Попробуйте напечатать URL-адрес изображения в консоли, чтобы убедиться в его значении. Ошибка говорит, что его значениеnull так что вы могли не написать ключ Map ключ URL изображения правильно.