Saving and accessing decorators

[dexter-ops]

I have implemented code through which a user can add decorators through a button click. But how do I permanently save it.
Here is my decorator class:

class RedMarkDecorator(context: MainActivity?, currentDay: CalendarDay?) : DayViewDecorator {
        var myDay = currentDay
        var color = RED
        override fun shouldDecorate(day: CalendarDay?): Boolean {
            return day == myDay
        }

        override fun decorate(view: DayViewFacade) {
            view.addSpan(DotSpan(7f, color))
        }
    }

onDateSelected:

override fun onDateSelected(
     widget: MaterialCalendarView,
     date: CalendarDay,
     selected: Boolean
 ) {
     // Toast.makeText(context,"$date",Toast.LENGTH_SHORT).show()
     redButton.isVisible = true
     greenButton.isVisible = true
     clearButton.isVisible = true
     val thisDate = calendarView.selectedDate?.date
     val date: CalendarDay = CalendarDay.from(thisDate)
     redButton.setOnClickListener {
         calendarView.addDecorator(RedMarkDecorator(myActivity, date))
     }

     greenButton.setOnClickListener {
         calendarView.addDecorator(GreenMarkDecorator(myActivity, date))
     }

     clearButton.setOnClickListener {
         calendarView.removeDecorator(RedMarkDecorator(myActivity,date))
         Toast.makeText(context,"cancel clicked",Toast.LENGTH_SHORT).show()
     }
 }