Since we DON'T know what you want to do with barcodes, here is the existing threads here for using BARCODES with APEX:
"What is the difference between a Democrat and a Republican? A Democrat blows, a Republican sucks." –Lewis Black
Interesting that you asked. I was just working on a very simple proof-of-concept over the weekend that uses Phonegap, backed by APEX and works on an Android phone/tablet. Simple examples are great for learning and experimenting. If you're interested, I can send you the APK. Code-wise, I will put them up on Github when I have the chance (and time :) ).