title: How to add icon to the menu of actionbar in android studio
body: <p>My app has a menu (the default icon of menu is three dots) which contains several items. I want to add a icon to the menu not the icon to the actionbar. I research for 3 hours but all of the tutorials are about adding icons to the actionbar not the menu. Anybody knows how to do this or have the tutorial link?</p>
  
  <p><a href="https://i.stack.imgur.com/PgTTK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PgTTK.png" alt="enter image description here"></a></p>
  
  <p>On the top right</p>