menu won't show up android -

hi i'm trying show menu when user presses menu button. i'm using code documentation options menu won't show up. guess should have listener menu button, how?? class far:

    public class appmenu extends activity {   @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.about);     }   @override  public boolean oncreateoptionsmenu(menu menu) {      menuinflater inflater = getmenuinflater();      inflater.inflate(r.menu.appmenu, menu);      return true;  }   @override  public boolean onoptionsitemselected(menuitem item) {      // handle item selection      switch (item.getitemid()) {      case r.id.hello:          sayhello();          return true;      case r.id.bye:       finish();          return true;       default:          return super.onoptionsitemselected(item);      }  } } 

here xml file

    <?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android">     <item android:id="@+id/hello"           android:title="hello"            android:icon="@drawable/icon"/>     <item android:id="@+id/bye"           android:title="bye" /> </menu> 

thanks !

this answer in response comment discussion on question.

you can't have menu appear outside of activity. means have start activity , inside activity you'll able menu appear on menu button press.