java - How to set Context menu to onBackPressedButton? -

i'm trying set context menu onbackpressedbutton "are sure quit?" here override onbackpressed: don't know how call menu. should register here?

@override public void onbackpressed() {     registerforcontextmenu();     return; } 

or view should attach?

    @override public void onbackpressed() {     this.opencontextmenu();     return; } 

should create viewlist it? i've overridden oncreatecontextmenu:

   public void oncreatecontextmenu(contextmenu menu, view v,                                 contextmenu.contextmenuinfo menuinfo) {      menu.add(0,yes,0,"yes");     menu.add(0,no,0,"no"); } 

i've overridden , oncontextitemselected:

@override public boolean oncontextitemselected(menuitem item) {     switch (item.getitemid()) {         case yes:             finish();             break;         case no:             break;     }     return super.oncontextitemselected(item); } 

how must it?

just call onbackpressed() method in class. find sample code below.

public void onbackpressed() {     new alertdialog.builder(this)             .settitle("really exit?")             .setmessage("are sure want exit?")             .setnegativebutton(android.r.string.no, null)             .setpositivebutton(android.r.string.yes,                     new dialoginterface.onclicklistener() {                          public void onclick(dialoginterface arg0, int arg1) {                             intent intent = new intent(intent.action_main);                             intent.addcategory(intent.category_home);                             intent.setflags(intent.flag_activity_new_task);                             startactivity(intent);                             loginactivity.super.onbackpressed();                             finish();                         }                     }).create().show(); }