Android POS App

I need an android application for recording visitors to a booth at a trade show. It should have the following features: -Work on Android 2.x -Run in the background and start automatically when android starts -Allow a magnetic card swipe reader to be connected to the USB port. This device is designed to connect to a computer as a human interface device (HID) and sends data to the computer like a USB keyboard would. -Read the data being sent by each swipe on all 3 tracks -Encrypt the data with some basic encryption and a preset key -Send the encrypted data by SMS to a specified phone number, split into multiple messages if necessary. This should be done every time a card is swiped. -There should be an icon in the Applications menu that allows you to access the program to change the following options: A. The encryption key B. The phone number that the SMS messages are sent to