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:
www.b4x.com
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.
This is link to it:
Immersive Mode - hide the navigation bar
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...

Only one note - on my device it complain some crap about security, though still allow to install and appears working flawlessly.
Thanks again, Erel.