That's a good point I forgot to mention;

mBarcode is licensed with the GPL license, meaning that you should release your application with the same (or compatible) license if you copy code from mBarcode. In other words, you should make your application open source as well, if it is not already GPL-licensed.

You don't have to worry about this before you release/distribute your application, however While developing before distribution you don't have to release the source code.

I hope this is not problematic for you, but if it is, just give us a heads up and I'm sure we could figure something out.