android - How to add search icon in action bar? -

i using navigation drawer,and have action bar in fragments,i trying add search icon in action bar not appearing,app not crashing icon not visible in action bar,following code can 1 help

<menu xmlns:android="http://schemas.android.com/apk/res/android" >      <item         android:id="@+id/action_settings"         android:orderincategory="100"         android:showasaction="never"         android:icon="@drawable/searchs"         android:title="@string/action_settings"/>    </menu> 

mainactivity

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

i think because of:

android:showasaction="never"

instead of use:

android:showasaction="ifroom"