Android Question APK obfuscation

Sreepathy T L

Licensed User
When I am trying to obfuscate the apk code using the inbuilt obfuscation, it is changing only the variable names in the code which I have added, without affecting the included libraries. Hence I tried to use the free tool Pro guard for obfuscating the apk code to prevent easy de-compilation and modification as requested by my client. However Pro-guard says
The input doesn't contain any classes. Did you specify the proper '-injars' options?
and stops. Is there any way to rectify it or any alternate solutions to obfuscate the entire code including the included libraries?