android manifest merger failed, gms play services / firebase

Question

I am trying to add firebase to my app using the firebaseUI. As the documentations says, I have used the corresponding gms:play-services (11.0.4) with the firebaseUI version

Answer 1

add this line at the end of app level gradle file

apply plugin: 'com.google.gms.google-services'

Answer 2

I was able to solve by hoovering over compile 'com.android.support:appcompat-v7:26.0.0' and adding the libraries manually that it said was wrong such as

compile 'com.android.support:cardview-v7:26.0.0'
compile 'com.android.support:animated-vector-drawable:26.0.0'
compile 'com.android.support:customtabs:26.0.0'