02-28-2012 01:08 PM
If you are talking about 1 bluetooth connected barcode scanner, you need to get the SDK from the manufacturer.
If you are talking about using the phones camera, then in OS 6.0 and above the package com.google.zxing is built-in. Prior to that you have to integrate it yourself. I've not actually done it but from memory there are Threads on this forum that talk about it.