Android Photo Grouping App

Create an Android app for users to position their phone gallery photos on the background image. Users can later browse their photos, zoom in and out (like in google maps) to see more or less details. App needs file or database for saving the positioning data. Functionality needed: 1. Selection of photo (from phone's native photo gallery) 2. Selecting the positioning on the background image (and saving the coordinates to file/database) 3. Browsing the earlier mapped photos on the background image (fie/database data retrieved and photos positioned accordingly, zoom in/out) Other important info: -compatible with Android 4.0 --> -performance should be ok with 500 photos (no visible delays, smooth user experience) -background image scalable vector graphics