java - Ice cream sandwich - Full Screen is not working -

i implementing launcher. want disable back/home/settings button on screen while. therefore want set full screen. in gingerbread , honeycomb, works fine in ice cream sandwich not. have tried below codes, neither works.

getwindow().getdecorview().setsystemuivisibility(view.system_ui_flag_hide_navigation);  actionbar actionbar = getactionbar(); actionbar.hide();  requestwindowfeature(window.feature_no_title); getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen); 

also have set theme fullscreen in manifest.

use android:theme="@android:style/theme.notitlebar.fullscreen"> in manifest