Android ==> ant and proguard ??

Question

I am getting the following error while obfuscating my application. How can i define the output jar in my build.xml?

 [java] Shrinking...
 [java] java.io.IOException: The output jar is empty. Did you specify the proper '-keep' options?
 [java]     at proguard.shrink.Shrinker.execute(Shrinker.java:148)
 [java]     at proguard.ProGuard.shrink(ProGuard.java:294)
 [java]     at proguard.ProGuard.execute(ProGuard.java:100)
 [java]     at proguard.ProGuard.main(ProGuard.java:499)

Answer 1

The tutorial here has never gone wrong for me.