Proguard configuration for Firebase-UI library

Question

When creating a APK with proguard enabled, the following exception is thrown when using the FirebaseRecyclerAdapter from the Firebase-UI library (com.firebaseui:fireba

Answer 1

Solved this by moving the ViewHolder classes that are used by the FirebaseRecyclerAdapter to a dedicated package (e.g. com.mypackage.myapp.viewholders) and adding a rule within the proguard configuration to prevent that classes within this package become obfuscated by proguard:

-keep class com.mypackage.myapp.viewholders.** { *; }

Answer 2

Well, I had my ViewHolder inside relative FirebaseRecyclerAdapter as an inner class and gave me this error. Making the inner class has solved the problem.

Also https://github.com/firebase/FirebaseUI-Android/issues/46#issuecomment-167373575 states same thing with an addition.

Inner class ViewHolder must be public and static so that it could be initiated via reflection.