Notification.Builder 에서 setLights 라는 함수 있는데 이걸로 해보심이..
public Notification.Builder setLights (int argb, int onMs, int offMs)
Set the desired color for the indicator LED on the device, as well as the blink duty cycle (specified in milliseconds). Not all devices will honor all (or even any) of these values.
ledARGB
ledOnMS
ledOffMS