import Material 0.2
A floating action button.
An ActionButton is a floating action button that provides a primary action on the current page.
The color of the action button. By default, this is the accent color of your app as defined by Theme::accentColor.
The color of the icon displayed on the action button. By default, this is automatically selected based on the backgroundColor.
The name of the icon to display in the action button, selected from the Material Design icon collection by Google.
Floating action buttons come in two sizes: