1 . Menu (Menu)
a. Options menu (OptionMenu)
Options menu is a main menu item of the application, the application for placing operations generated global impact.
Wrapped with Menu item, a submenu also need to use Menu wrapped item.
Button frequently used by app: showAsAction = "always" be set, and can be android: specified icon button icon attribute,
When the icon and the text exist, through the app: showAsAction = "always | withText"
b. context menu (the ContextMenu)
c. pop-up menu (PopupMenu)