Obtain the View reference of the overflow button in the ActionBar, using java reflection.

OverflowButton.java

    // Path to overflow button in nutshell:  android.R.id.home -> ActionBarView -> AbsActionBarView -> ActionMenuPresenter -> mOverflowButton 
     
public static View getOverflowButton(Activity a){
      View homeButton = a.findViewById(android.R.id.home);
        ViewParent parentOfHome = homeButton.getParent().getParent(); //ActionBarView is parent of home ImageView, see layout file in sources
        try{
        
            parentOfHome = parentOfHome.getParent();//get to ActionBarView;
            Class absActionBarView = parentOfHome.getClass().getSuperclass(); //ActionBarView -> AbsActionBarView class
            Field menuPresenter = absActionBarView.getDeclaredField("mActionMenuPresenter"); // ActionMenuPresenter is the object that calls openOverflowMenu() closeOverflowMenu()
            menuPresenter.setAccessible(true); 									  // and contains the overflow button view.
            Object menuPresenterView = menuPresenter.get(parentOfHome);
            Field overflowField = menuPresenterView.getClass().getDeclaredField("mOverflowButton");
             overflowField.setAccessible(true);
             View overFlowButtonView = (View) overflowField.get(menuPresenterView);
             return overFlowButtonView;              
        
      }
      catch(NoSuchFieldException e){
    	   Log.e("getOverflowButton()", e.getMessage());
    	   
       } catch (IllegalArgumentException e) {
    	   Log.e("getOverflowButton()", e.getMessage());
       } catch (IllegalAccessException e) {
		   Log.e("getOverflowButton()", e.getMessage());
       }
		return null;
    }