There is such thread in tutorial,though it is locked for replays and it is suggested to make a new one.
This is link to it:
Immersive mode means full screen mode where the navigation bar is also hidden. The user can bring back the bars by swiping near the edges. The required steps are: 1. Call setSystemUiVisibility with the immersive flags. This is done in Activity_WindowFocusChanged. 2. Get the full display size...
I tried it and it worked like a charm, thanks to Erel.
Only one note - on my device it complain some crap about security, though still allow to install and appears working flawlessly.
Thanks again, Erel.