How to hide Naviation Bar.

Hide Navigation Bar.

edit build.prop
qemu.hw.mainkeys=1


or

setprop qemu.hw.mainkyes 1
killall system_server


If sdk version is API Level 11(Android 4.2.2), add setSystemUiVisibility function in your Activity.

getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);