Android: Is there a way to implement the barcode scanner into an app? [closed]
Here is an example of a third-party library for scanning barcodes: https://github.com/zxing/zxing/wiki/Scanning-Via-Intent
As I am not an experienced Android developer, I don't know if you can talk back and forth between applications due to sandboxing. However, there is a barcode scanner called zxing which is "an open-source, multi-format 1D/2D barcode image processing library implemented in Java. Our focus is on using the built-in camera on mobile phones to photograph and decode barcodes on the device, without communicating with a server."
Seems pretty solid, so I would recommend using that.