My project is as follows: 4 friends smartphones with Android, Apple, Windows and Blackberry respectively, leaving the field to look for birds. Every time each of them is a bird that wants to register in your smartphone, this puts a name to see a new record, makes him a photo, brief description and record the sound it emits. At the end of the day, they come back together and want to exchange the chips of the birds that each one has studied.

Every smartphone has exactly the same database file, but with different chips, and the aim is that, regardless of smartphone operating system, each user can send and / or received each full record of the bird.
Thank you very much

Please excuse my basic English, please.