Launch an activity on pressing a number on dial pad
<p>I want to launch my activity as soon as I press certain number on dial pad (e.g #123#).<br>
The whole scenario is-<br>
1- User press certain keys on dial pad.<br>
2- As soon as  the number matches to an specified number my activity should be launched.<br>
3- The dial pad must go off the screen.  </p>

<p>Help please.<br>
Thanx.  </p>
