No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp() -Flutter

Question

I'm developing a note-taking app (Android app) that uses Firebase, So I intend to add Firebase Authentication. I created the app on Firebase console.

I'm taking an error, as you can see at the image down below:

I tried some fixes, that I found at Stack Overflow.

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  await Firebase.initializeApp();
  
  runApp(const MyApp());
}

This is the main function in main.dart

I guess I'm missing a spot. But I can't find it.

How can I solve this problem?

Answer 1

For Flutter android if you are initializing Firebase with just

Firebase.initializeApp();

without passing any arguments to the initializeApp function (ie firebase configuration/api keys of your project), then you need to add the google-services.json inside the android/app/ folder and add some code in build.gradle files so the app knows where to take project configuration from.

The recommended way though is to use the flutterfire_cli package to handle downloading all the necessary configuration files and adding required code to initialize Firebase for your flutter app.

Follow these steps:

1. Go to https://console.firebase.google.com/
2. Select your project
3. On the project overview page you would see a Add app button

4. Click on it and choose the Flutter option

5. Then follow the step shown on screen and you'll be good

Answer 2

do you have firebase_core dependencie in your pubspec.yaml?? if not: install firebase_core and import it in your main file.