I just forget to add Google services plugin in android/app/build.gradle
:
apply plugin: 'com.google.gms.google-services'
Make sure you have firebase_core in your pubspec.yaml Then, just use the following in your main:
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
run
flutter clean
and
flutter pub get
in your terminal.
If it still fails, please go step by step following the firebase documentation. It should work. https://firebase.google.com/docs/flutter/setup?platform=android
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