Firebase AuthUI: NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/internal/zzbgl

Question

My App crashes whenever I call this code:

if (FirebaseAuth.getInstance().getCurrentUser() == null) {
        startActivityForResult(
                AuthUI.getIn         


        

Answer 1

Change this:

compile 'com.firebaseui:firebase-ui-auth:3.3.0'

into this:

compile 'com.firebaseui:firebase-ui-auth:4.0.0'

from the docs:

As of version 4.0.0, FirebaseUI has the following dependency versions:

Library Version
firebase-auth   16.0.1
play-services-auth  15.0.1
firebase-database   16.0.1
firebase-firestore  17.0.1
firebase-storage    16.0.1

more info here:

https://github.com/firebase/FirebaseUI-Android#dependencies