HiI have an application that I use at the wholesale dealership where I work. With this application, I select a customer's name and scan the barcodes of the products available at the dealership to create an order. When I scan a barcode, the applicatio...

HiI've an app for barcode scanning. When user click Add button camera opens up and scan the barcode, This "add" button can trigger with volume down button on phone ?Thanks