Barcode Scanner is an immensely useful app for Android. It can be installed from here.
This app uses the camera of your phone or tablet to read and decipher 1D barcodes (typically used on all packaged products) and QR codes.
Have fun scanning over the barcodes on all your groceries and seeing what information they hold! 😊
Tried with: Barcode Scanner 4.6.4, Android 4.4.2 and Moto G