java - Android options menu does not work? -

i have single activity in project. created options menu 3 items. don't know why not work me. every time select item item id 0.

res/menu/m1.xml:

<?xml version="1.0" encoding="utf-8"?>  <menu xmlns:android="http://schemas.android.com/apk/res/android">     <item android:id="@+id/item1"         android:title="one">     </item>     <item android:id="@+id/item2"         android:title="two">     </item>     <item android:id="@+id/item3"         android:title="three">     </item> </menu> 

activity:

public class mainactivity extends activity {      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         menu.add("1");         menu.add("2");         menu.add("3");         return super.oncreateoptionsmenu(menu);     }      @override     public boolean onoptionsitemselected(menuitem item) {         switch(item.getitemid()){             case r.id.item01: toast.maketext(this, "1",toast.length_short);                 break;             case r.id.item02: toast.maketext(this, "2",toast.length_short);                 break;             case r.id.item03: toast.maketext(this, "3",toast.length_short);                 break;             default: toast.maketext(this, "-----",toast.length_short);         }         log.v("demo", "item id: "+item.getitemid());         return super.onoptionsitemselected(item);     } } 

when select item 0 in log. why?

replace oncreateoptionsmenu() method below code

@override public boolean oncreateoptionsmenu(menu menu) {     getmenuinflater().inflate(r.menu.m1, menu);     return true; }