want to make project on android

[AC Question]

sir i want to make project on out based application.the idea is when some one is going on his route if keep recording and at the end when he/she reached his/her destination,the time reqired to reached there and speed that the particular fellow has follow through out the journey will show on a dialog box.i want some idea what that what else i need to complete this project.how many classes should i have to make and is there a need of database