What is orderInCategory in ActionBar menu item & why it is use for..?

Question

Im working on action menu item and its over flow item this is my main_menu.xml

Answer 1

android:orderInCategory Higher value, lower priority.

I have a Activity and a Fragment in it, both of them have option menu, and the item numbers are 1 and 3.

If I set android:orderInCategory=0, the activity menu are above the fragment menu, same effect before I set the value.

But if I set android:orderInCategory=1,the activity menu are below the fragment menu, and that is what I want.(I also test android:orderInCategory=5 tested too, still the same effect.)