image asset not loading in flutter firebase project - flutter

Question

I am following one tutorial on flutter and I am trying to load an image, unfortunately, the image was unable to load. I always have an error in console that the image was unable to load.my code is as followed:
import 'dart:ffi';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
final GoogleSignIn googleSignIn = new GoogleSignIn();
class Home extends StatefulWidget {
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
bool isAuth = false;
#override
Void initState() {
super.initState();
//detect when user sign in
googleSignIn.onCurrentUserChanged.listen((account) {
handleSignIn(account);
}, onError:(err){
print('error signing in:$err');
}
);
//re-authenticated when user sign in the app
googleSignIn.signInSilently(suppressErrors: false).then((account){
handleSignIn(account);
}).catchError((err){
print('error signing in:$err');
});
}
handleSignIn(GoogleSignInAccount account){
if (account != null) {
print(account);
setState(() {
isAuth = true;
});
} else {
setState(() {
isAuth = false;
});
}
}
login() {
googleSignIn.signIn();
}
logOut(){
googleSignIn.signOut();
}
Widget buildAuthScreen() {
return RaisedButton(
child:Text("LogOut"),
onPressed: (){
logOut();
},
);
}
Scaffold unAuthBuildScreen() {
return Scaffold(
body: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topRight,
end: Alignment.bottomLeft,
colors: [
Theme.of(context).primaryColor,
Theme.of(context).accentColor,
],
),
),
alignment: Alignment.center,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text(
"FlutterShare",
style: TextStyle(
//fontFamily: "Signatra",
fontSize: 50.0,
color: Colors.white,
),
),
GestureDetector(
onTap: () => print("tapped"),
child: Container(
width: 260.0,
height: 60.0,
decoration: BoxDecoration(
image: DecorationImage(
// image:AssetImage(bund"assets/images/google_sigin_button.png"),
image: AssetImage("assets/images/google_sigin_button.png"),
fit: BoxFit.fill),
),
),
),
],
),
),
);
}
#override
Widget build(BuildContext context) {
return isAuth ? buildAuthScreen() : unAuthBuildScreen();
}
}
pubspec.yaml is as follows.Please help me
name: fluttershare
description: A new Flutter project.
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.1.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
firebase_auth: ^0.15.5+3
firebase_database: ^3.1.3
cloud_firestore: ^0.13.4+1
image_picker: ^0.6.4
firebase_storage: ^3.1.5
google_sign_in: ^4.4.1
geolocator: ^5.3.1
uuid: ^2.0.4
timeago: ^2.0.26
path_provider: ^1.6.4
flutter_svg:
cached_network_image: ^2.0.0
firebase_messaging: ^6.0.13
image: ^2.1.4
animator: ^1.0.0+5
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter.
flutter:
uses-material-design: true
assets:
- assets/images/google_signin_button.png
- assets/images/upload.svg
- assets/images/search.svg
- assets/images/activity_feed.svg
- assets/images/no_content.svg
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.dev/assets-and-images/#resolution-aware.
# For details regarding adding assets from package dependencies, see
# https://flutter.dev/assets-and-images/#from-packages
# To add custom fonts to your application, add a fonts section here,
# in this "flutter" section. Each entry in this list should have a
# "family" key with the font family name, and a "fonts" key with a
# list giving the asset and other descriptors for the font. For
# example:
# fonts:
# - family: Schyler
# fonts:
# - asset: fonts/Schyler-Regular.ttf
# - asset: fonts/Schyler-Italic.ttf
# style: italic
# - family: Trajan Pro
# fonts:
# - asset: fonts/TrajanPro.ttf
# - asset: fonts/TrajanPro_Bold.ttf
# weight: 700
#
# For details regarding fonts from package dependencies,
# see https://flutter.dev/custom-fonts/#from-packages
please help I have been on this for the past 3 days

Answer 1

Here is the Android’s density to Flutter pixel ratio
Android density qualifier Flutter pixel ratio
ldpi 0.75x
mdpi 1.0x
hdpi 1.5x
xhdpi 2.0x
xxhdpi 3.0x
xxxhdpi 4.0x
Best way to add images is to create an asset directory structure like that.
Put your images base on the density mapping to appropriate folder, flutter will pick image based on the device density.
You don't need to add every image path in pubspec.yaml only root folder is enough. Make sure assets and pubspec.yaml are in same directory level.
flutter:
assets:
- assets/images/
Hope it will solve your problem.

Answer 2

I think if you're using firebase for the authentication, you should use firebase storage to store your images.
You need these imports.
import 'package:firebase_storage/firebase_storage.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:cached_network_image/cached_network_image.dart';
And in the main function you need this code.
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
UserCredential userCredential = await FirebaseAuth.instance
.signInAnonymously(); // you need to indentify your user
print(userCredential);
runApp(MyApp());
}
You can load your images with this code.
FutureBuilder<dynamic>(
future: FirebaseStorage().ref('google_sigin_button.png').getDownloadURL(),
builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
if (snapshot.connectionState != ConnectionState.waiting) {
return Image(
image: CachedNetworkImageProvider(snapshot.data.toString()),
fit: BoxFit.cover,
);
} else {
return Text('Loading image....');
}
},
),
If you need more information how this actually work, you should see my github repository where you can find an example for this.
https://github.com/orosiferenc3/Flutter_Firebase_Storage_connection