Add new functions in existing Android app

I am selling a program for cameramen and photographers and my regular programmer is too busy to help me within a short timespan. I need to implement two new functions in my APP. One is a DB with some filters and one is a simple GUI calculation. I have done the work myself in the Desktop / Mac version and the IOS version so there are examples for testing. Here you can see the IOS version in a slide show: [login to view URL] The DB is in SQLite format and a few are already used in the App. So it is more about integrating the same way and adding the screens/filters. This project should take a few days with all the good examples that are already there.