Android APP w/ timer and DB functions

I want to have an APP with timer functions like this simple stopwatch (with millisec accuracy): [login to view URL] but with SAVING functions to a DataBase. a maximum of 10 consecutive time values is needed to be saved (each one lap time is within 5 seconds): 1 ; 00:00:01.37 ; 00:00:01.37 2 ; 00:00:02.76 ; 00:00:01.39 3 ; 00:00:04.32 ; 00:00:01.56 4 ; 00:00:06.04 ; 00:00:01.72 5 ; 00:00:07.95 ; 00:00:01.91 6 ; 00:00:10.15 ; 00:00:02.20 7 ; 00:00:13.07 ; 00:00:02.91 SAVE as: 18 The above 1-7 (max. 1-10) values should be saved with an integer number (for example 18). These series of numbers make up the database. Each time, if the first 4-5-... (should be set the number) values are equal to, or fall within 1-2-...% (should be set the number) of an already recorded series, the APP should give back the 'SAVE as' integers of the database. I am thinking about a very simple interface with only 2 large buttons ('Start / Lap', and 'Save'), the 'Save' should open a pop-up input field for saving the series (only numbers are allowed - see the above: 18).