Android onBackPressed dont work when DrawerLayout is opened -

in appliaction i'm using drawerlayout have sliding menu, want override onbackpressed close drawerlayout if opend, or close application, onbackpressed dont work when drawerlayout opend, must close , try again press button

@override public void onbackpressed() {     if (mdrawerlayout.isdraweropen(ui.slide_menu)) {         mdrawerstate = false;         mdrawerlayout.closedrawer(ui.slide_menu);     }     if (g.back_pressed + 2000 > system.currenttimemillis()) {         super.onbackpressed();     } else         toast.maketext(g.context, r.string.press_once_again_to_exit, toast.length_short).show();     g.back_pressed = system.currenttimemillis(); } 

try this,

 if(mdrawerlayout.isdraweropen(gravity.left))     {         mdrawerlayout.closedrawer(gravity.left);     }