Proguard causing runtime exception with Android Navigation Component

Question

I\'m experiencing this crash when using proguard after integrating the NavigationComponent (android.arch.navigation:navigation-fragment-ktx:1.0.0-alpha01) into

Answer 1

My issue was that I was using the fragment name on the layout. After R8, the names are obfuscated causing the issue.

In my case, the solution was to keep only the name in the Proguard file, as such:

#-------------------------------------------------
# JetPack Navigation
# This fixes: Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment androidx.navigation.fragment.NavHostFragment: make sure class name exists
#-------------------------------------------------
-keepnames class androidx.navigation.fragment.NavHostFragment