It is an android application feature that can be implemented in any android application.
When the user opens the application, the screen visible to the user is-
When the user clicks on 3-dot menu in the right-top corner of the screen, then a menu appears that contains a Submenu of name File and two menu items(Coding and Programming)-
If the user clicks on Coding item, then-
Here, I have displayed a toast of Coding but the user can display anything here or may implement any function
If the user clicks on Programming item, then-
Now , when the user clicks on File Submenu, then-
Status and calls are the two Submenu items and File is the menu item-
File item is looking dim because File is the Submenu and Submenu items (Status and Calls) are looking dark-
When the user clicks on Status Submenu item, then-
If the user clicks on Calls Submenu item, then-
In this application, I have displayed the toasts but the user can display anything or move to another activity or implement any function or whatever the user wants.