making a progress dialog stop when clicking on back activity in android
===

I am developing an android application in which i have 3 edittexts and a button.I have implemented progress dialog on button click.I want to stop a dialog on pressing back button,But that progress dialog is not dismissing,,,,I have tried dismissing,finishing dialog,,but of no use

I have tried setcancellable false,,,,its not working


Code is 

http://pastie.org/4251606
		
can anyone suggest me,,,


Thanks in advance
TUshar  
