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 is an integer attribute that dictates the order in which the menu items will appear within the menu when it is displayed.

• Menu items in ToolBar are arranged from left to right (or start to end in RTL mode) in the ascending order (i.e. 1,2,3 -> left to right).

• Menu Items in Overflow menu are arranged from top to bottom in the ascending order (i.e. 1,2,3 -> top to bottom).