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

I had same issue, after trying lots of things, this fixed this issue for me:

I modified my build.gradle on allProjects{} and added the following

allprojects {
  repositories {
    google()
    jcenter()
   //start here
    configurations.all {
        resolutionStrategy.eachDependency { DependencyResolveDetails details ->
            def requested = details.requested
            if (requested.group == 'com.google.android.gms') {
                details.useVersion '12.0.1'
            }
            if (requested.group == 'com.google.firebase') {
                details.useVersion '12.0.1'
            }
        }
    }
    //end
  }
}

source here