Firebase Flutter does not work in emulator

Question

I configured my flutter project with the Firebase CLI ,
I did it by following the necessary steps in flutter fire docs. I also did the manual installation for the emulator but my problem was not solved
Flutterfire documents: https://firebase.flutter.dev/docs/overview

 My problem is this: 

  (V) Firebase plugins work when I compile it into Flutter WEB 

  (X) But it does not work in the emulator. 
 
   * I've done the SHA-KEY additions to the console firebase 

   * I've updated the google-services.json file.

   * I also updated two build gradle files

I get the following errors when starting the application
>> Note: Some input files use or override a deprecated API.
>> Note: Recompile with -Xlint:deprecation for details.
i also run the following console codes for this error
flutter pub upgrade
flutter clean
flutter run

Answer 1

try to add firebase to your project with the instruction from firebase console

Answer 2

these are the warning messages you can ignore them, have you addded the firebase initializer in the main.dart file?

Note: Some input files use or override a deprecated API. Note: Recompile with -Xlint:deprecation for details.

Need to add this line in main.dart

await Firebase.initializeApp(   options: DefaultFirebaseOptions.currentPlatform, );