[android-developers] AlertDialog in Fragment

Hi I have a issue with AlertDialog in Fragment.

I click on a button in fragment that will launch AlertDialog. Button will do some background work and after 2 second it will start AlertDialog. If in between before launching AlertDialog if I press back button my previous acticity is being displayed and then that Alertdialog launching. I want AlertDialog should not display if i press back button. If anyone has any idea please let me know.
Thanks.

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