How to implement drag'n'drop app in Android

I want to write an app for my thesis that it will have some 开发者_运维百科items/icons and i will drag'n'drop them in a box and then it will make a query in a database and return the result..but i can't find information on how to combine the drag'n'drop with the box...

have a look at DroidNova You need to delve into the graphics to get it done!

Or this Simple Drag n Drop on Android