How to Sync the touch and animation frames?

Hi,

I am trying to do a android-touch app for playing animations like explode/implode from animator controller. I have no idea where to start. I want like:

1. When i use my two finders on the screen like <---0---> from centre to outward, an explode animation should be played(animation of the parts of an object getting separated.)

2. When i use my two finders on the sreen like --->0<--- from outward to centre, an reverse animation of implode should be played.

I have done the explode animation in maya and brought to unity. so no problem with animation.. But help me how to sync the 2 finger touches of in and out with animation controller..

Thank you