I have got an error and this is my error :Make sure to call FirebaseApp.initializeApp(Context) first

Question

This is my code

app gradle

Project gradle

Answer 1

In your application class, initialize FirebaseApp in onCreate() method and remove it from Your Activity in order to have Firebase initialize into entire application, not just to one Activity.

@Override
public void onCreate() {
    super.onCreate();
    FirebaseApp.initializeApp(this);
}

Also add apply plugin: 'com.google.gms.google-services' at the end of app gradle:

dependencies {
    ....
}
apply plugin: 'com.google.gms.google-services'

For more: Make sure to call FirebaseApp.initializeApp(Context) first in Android

Make sure that you have added google-services.json to your app after regidterin to firebase. Refer:https://firebase.google.com/docs/reference/android/com/google/firebase/FirebaseApp