For better compatibility it was designed in a way that you have to have ZXing BarcodeScanner installed. It is an application which is continuously updated and is useful for most devices.
First you have to enable GPS receiver on you device. You can do it by pressing the Settings button. Next step is to wait for location to be read from nearby satellites. At first last known location is loaded and then after a while (it can take even minutes on some devices) an actual location is loaded.
Long press on item and contextual menu will appear. The rest is easy...
Press menu button on your device. A menu for that should be revealed to your eyes.
It's just for fun. I was going to delete it but I decided to leave it there for Czech users who like to laugh at randomly generated sequence of words. Don't use it if you don't like it.
Maybe. But this one has open source code and may be helpful for Android developers.