Now i develop a device which can measure human heartbeat. The pulse heartbeat data will send through Serial Bluetooth to any android device. I need an simple user interface app to record and store the data and display in text or line graph in weekly, monthly or yearly. Like my device detect 60, the app screen will appear 60 and store in database. After weeks or months, user can display the result using line graph. Every time I activate my device, the app will work with it.