Qr & barcode scanner is the fastest qr / barcode scanner out there. qr & barcode scanner is an essential app for every android device. qr & barcode scanner / qr code reader is extremely easy to use; simply point to qr or barcode you want to scan and app will automatically detect and scan it.. The barcode scanner app for android is one of the most popular scanner app on the android market. the app gives almost instantaneous result and gives the information about the code format, type, time and the metadata..