Piano key multi touch problem

Hi,

I am working on a kids piano app and facing issue to implement it. touching individual key working working fine also holding one key and pressing other key is working. bu my problem is touching on one key and moving to other keys without lifting finger is not working which is natural in piano. I am not able to under stand I search on the web and found out that multi touch is enabled in android buy default but then touching on key and moving finger over other keys should work .

-vijayk