Q:

Convert application using wifi to application using bluetooth

I have an android app, it does the following:
Connects with a server to read and update a database at the same time as others. 
I want to convert this to an app that does not need an internet connection.  Therefore i would like to know if its possible to have an android device acting as the server with the database, whilst multiple phones connect to it via bluetooth getting and updating the information in the database? 
Thanks

A:

Yes.  It possible. 
However all of your devices will have to be located nearby, so they can connect to each other through bluetooth. 
You can take a look at Android Bluetooth API. 
However, my recommendation would be to use Wifi instead of Bluetooth.  YOu will need additional WiFi router.  However, you won't need to deal with Bluetooth API in such case. 
You will only need to write a server on one of Android device and the rest of devices will work the same (as now)

