Barcode Scanner to terminal with android with an integrated scanner

Hello everybody!

I created a barcode scanner application, which does scans of 2 barcodes and then compares them.
It works on my phone with android because I marked "UseExternalScanner" and I use ZXing app.
The problem I have is, that I want to use this app on the terminal with android with an integrated barcode scanner (Newland MT90). My application uses a photo camera instead of an integrated scanner.
What should I do to solve this problem? Just unmark "UseExternalScanner" or should I do something more?
As a comment, I add, that without the ZXing app, the application doesn't work properly on the terminal.

I will appreciate your help.