Action Bar
Action bar contains a collection of horizontally aligned buttons.
Usage
Use an action bar to render multiple buttons in a row. Buttons can be split into groups by adding a divider. When there is not enough space, buttons that don't fit will be added to an overflow menu.
Anatomy
Action bar with buttons, divider, and overflow menu
Content
Buttons
Buttons are the only controls allowed in an action bar. Even though a segmented control is technically a group of buttons, it does not belong in an action bar because it's used for selecting an option, not triggering an action.
Only use buttons in an action bar.
Don't use other components in an action bar.
Button Types
Use either icons or text labels, but not both in the same action bar.
Don't mix types of button labels within the same action bar.
Options
Size
Action bars can have 3 different sizes: