set
This integer sets the default accent color for push notifications. If not specified, the default background color is gray (the same gray Android uses for system notifications). This value can be overridden at runtime by a push notification that sets a custom accent color.
Hexadecimal is a valid input for the color, i.e. "0xFFf33e3e".
Defaults to Notification.COLOR_DEFAULT.
Parameters
default
the integer color value for the default notification accents.