For the Android users around who hate Google Wallet because it, like Apple's Passbook, doesn't allow you to just put in any old barcode, there is a delightful app on F-Droid (not on the Google Play Store, unfortunately) called Loyalty Card Keychain ( <a href="https://f-droid.org/en/packages/protect.card_locker/" rel="nofollow noreferrer">https://f-droid.org/en/packages/protect.card_locker/</a> ).<p>This app allows you to simply enter a number (or scan an existing barcode), choose a barcode type (with lots of options, <i>including</i> Codabar!), and save it. Selecting the entry on the app's main screen shows the generated barcode and does the screen-brightening thing. Also the app opens super fast because presumably it doesn't do anything but, you know, displaying barcodes.<p>It has only one purpose but it may well be my most favourite app. I've even used it to transfer a barcode from some label in the supermarket to the self-checkout post, where for some reason the supermarket assumed that you use the hand-held self-scanning devices that I also don't like.<p>EDIT: it seems they want you to use Catima instead these days. Trying it briefly it's similarly simple, and seems to be based on the same codebase.