Flutter - FirebaseApp with name [DEFAULT] doesn't exist - firebase

Question

I'm working on a flutter application using firebase authentication system and Firestore. I worked for 3 months and I didn't encounter this error before. Now I published my application on play store and I found this error also for debug version with the emulator. I think to have configured properly the system because firebase worked for a while.
I think that this error occurs for all the apk that I builded after the upgrade of flutter.
Some suggestion to solve my problem?
Thanks
I enter my bundle ID on firebase and download the google-service.json file, copy and paste on android/app folder and build. I also tried to clean (as mentioned here https://github.com/flutter/flutter/issues/28003 ) and build the project and to enter some SHA1 and SHA-256 fingerprints to try if it was this the problem but I'm not sure which SHA1 enter on firebase. ReDownloaded the google-service.json and clean - build the project.
Other codes to initialise the FirebaseApp seems pretty old and I don't think that it can work for me like here (java.lang.IllegalStateException: FirebaseApp with name [DEFAULT]) .
I just authenticate a user using this code
user = await FirebaseAuth.instance
.signInWithEmailAndPassword(email: _email, password: _password);
and do some try catch to manage the output.
android/build.gradle
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.3.1'
classpath 'com.google.gms:google-services:4.1.0'
}
}
allprojects {
repositories {
google()
jcenter()
}
}
rootProject.buildDir = '../build'
subprojects {
project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
project.evaluationDependsOn(':app')
}
subprojects {
project.configurations.all {
resolutionStrategy.eachDependency { details ->
if (details.requested.group == 'com.android.support'
&& !details.requested.name.contains('multidex') ) {
details.useVersion "27.1.1"
}
}
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
android/app/build.gradle
android {
compileSdkVersion 28
lintOptions {
disable 'InvalidPackage'
}
defaultConfig {
applicationId "com.luxywebdesign.pocketstcw"
minSdkVersion 18
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
multiDexEnabled true
}
signingConfigs {
release {
storeFile file("my-release-key.keystore")
storePassword "StorePassword"
keyAlias "KeyAlias"
keyPassword "Password"
}
}
buildTypes {
release {
// Signing with the debug keys for now, so `flutter run --release` works.
signingConfig signingConfigs.release
}
}
}
flutter {
source '../..'
}
dependencies {
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.firebase:firebase-core:16.0.1'
}
apply plugin: 'com.google.gms.google-services'
pubspec.yaml
environment:
sdk: ">=2.1.0 <3.0.0"
firebase_storage:
dependencies:
flutter:
sdk: flutter
firebase_auth: 0.8.2
file_picker: ^1.3.3
firebase_storage: ^2.1.0+1
firebase_core: 0.3.1+1
cloud_firestore: ^0.9.7
permission_handler: ^2.2.0
path_provider: ^0.5.0+1
http: ^0.12.0+1
url_launcher: ^5.0.2
open_file: ^2.0.1+2
datetime_picker_formfield: ^0.1.8
share:
git:
url: https://github.com/d-silveira/flutter-share.git
flutter_launcher_icons: ^0.7.0
image_picker: ^0.6.0+1
modal_progress_hud: ^0.1.3
flutter_keychain: ^1.0.0
pdf: ^1.3.7
image: ^2.0.7
flutter_local_notifications: ^0.6.1
auto_size_text: ^2.0.1
shared_preferences: ^0.5.3+1
Error message :
D/FirebaseApp(23461): Default FirebaseApp failed to initialize because no default options were found. This usually means that com.google.gms:google-services was not applied to your gradle project.
at the start after the installation of the apk and ...
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): Failed to handle method call
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common##16.1.0:280)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.getAuth(FirebaseAuthPlugin.java:76)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.onMethodCall(FirebaseAuthPlugin.java:108)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:222)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:96)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:643)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at android.os.MessageQueue.next(MessageQueue.java:326)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at android.os.Looper.loop(Looper.java:160)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at android.app.ActivityThread.main(ActivityThread.java:6669)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
E/MethodChannel#plugins.flutter.io/firebase_auth(23461): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

Answer 1

I think the problem is you didn't make right the configuration settings. make sure to follow these steps :
Add your google-service.json file
Add apply plugin: 'com.google.gms.google-services' (app-level grade)
Add apply plugin: 'com.android.application' (app-level grade)
Add classpath 'com.google.gms:google-services:4.3.3' (project-level gradle)
After all this steps your problem should be solved. I also had the same problem once then I realise I didn't add step 2. Good Luck!