java - How to tell if Proguard has done its job

Question

I downloaded proguard encapsulated in a zip file and unpacked it onto my hard disk. I did not install it in any way (because I didn't know how). I then added proguard.config=proguard.cfg to my project.properties file. I then did an "export android application" fully expecting eclipse to complain that it didn't know where my proguard installation was, but there was no complaint. Indeed a new apk file appeared in my keystore, and a set of files (dump.txt etc) appeared in my app's proguard subdirectory. The mapping.txt looks like a nice list of mappings from my long variable names to one and two letter variables. This should all be strong evidence that proguard has somehow worked - my only concern is that the apk is scarcely any smaller than it was before. Is there any way to check that the apk includes proguard's obfuscations?

Answer 1

Normally the size will indicate whether ProGuard has worked but you can :-

1. Use Dex2Jar to convert the apk to a jar file
2. Open the resulting Jar file with Jd-Gui to view the code it contains