Prevent proguard from clobbering enum methods

It was breaking the playback activity actions

proguard.config

@@ -17,6 +17,11 @@
 -keep public class * extends android.app.backup.BackupAgentHelper
 -keep public class * extends android.preference.Preference
 
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
 -keepclasseswithmembernames class * {
     native <methods>;
 }
@@ -30,7 +35,7 @@
 }
 
 -keepclassmembers class * extends android.app.Activity {
-   public void *(android.view.View);
+    public void *(android.view.View);
 }
 
 -keep class * implements android.os.Parcelable {