Android 2.2 Timer

Hi All, Really simple job I am just looking to add a timer to my application. The timer needs to be located in the bottom right hand corner of the screen and counts up from 00:00 (mm:ss) until the stop button is clicked or it reaches 20:00 minutes. The stop button can be located anywhere on screen and launches a new activity with the total time that was on the counter when the button was clicked. The timer should start automatically when the application is run. Thanks for taking the time to look at my project.