java - ActionBar implementation throws an exception -

i implementing actionbar android. having difficulties java code. when run app eclipse throws me error in code:

package com.example.android.rssfeed; import android.app.activity; import android.content.intent; import android.os.bundle; import android.view.menu; import android.view.menuitem;  public class rssfeedactivity extends activity implements     mylistfragment.onitemselectedlistener { // place shows me error    @override   public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_rssfeed);   }    //new   @override   public boolean oncreateoptionsmenu(menu menu) {     menuinflater inflater = getmenuinflater();     inflater.inflate(r.menu.mainmenu, menu);     return true;   }    //new   @override   public boolean onoptionsitemselected(menuitem item) {     switch (item.getitemid()) {     case r.id.action_refresh:       toast.maketext(this, "action refresh selected", toast.length_short)           .show();       break;     case r.id.action_settings:       toast.maketext(this, "action settings selected", toast.length_short)           .show();       break;      default:       break;     }      return true;   }   }  

i left comment error is.

your activity needs override methods in of mylistfragment.onitemselectedlistener interface, otherwise shows compiler error.