Dotfuscator?

When you build your app you have the option of choosing the "Release (obfuscated)" option, which I believe does what you are asking?

Edit: If you search the forums using "Obfuscate" you will find this post from Erel on the B4A option I mention:
http://www.b4x.com/forum/basic4andr...13773-android-code-obfuscation.html#post77873
Plus some other entries on the topic.

Thank you so much!