private void setCalendar(){
    Map<Date, Drawable> successMap = new HashMap<>();
    Map<Date, Drawable> failureMap = new HashMap<>();
    //For success days
    for(int i=0; i<successDays.size(); i++){
        successMap.put(successDays.get(i), getResources().getDrawable(R.drawable.green_circular));
    }
    //For failure days
    for(int i=0; i<failureDays.size(); i++){
        failureMap.put(failureDays.get(i), getResources().getDrawable(R.drawable.red_circular));
    }
    caldroidFragment.setBackgroundDrawableForDates(successMap);
    caldroidFragment.setBackgroundDrawableForDates(failureMap);
    caldroidFragment.refreshView();
}