Obfuscate android.support.v7.widget.GridLayout issue

Question

I\'m trying to obfuscate my android application, where I use android.support.v7.appcompat and android.support.v7.GridLayout, but the app is crashing with the following excep

Answer 1

I'm using something like that (it may be too broad though):

# Preserve all fundamental application classes.
-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.view.View
-keep public class * extends android.preference.Preference
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider

# Preserve Android support libraries` classes and interfaces
-keep class android.support.** { *; }
-keep interface android.support.** { *; }