Hide Notification bar

Question

Anyone know how to disable/hide notification bar at the top which show battery and other things in android. Any help will be appreciated.

EDIT: Plea

Answer 1

The answers above hide ActionBar too. If you intend to only hide notification bar, use this code:

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

be careful to put it before setContentView().