CompactCalendarView

CompactCalendarView.java

//This lines should help you
@Override
public void onDayClick(Date dateClicked) {
    if (today == dateClicked) {
        compactCalendarView.setCurrentDayBackgroundColor(ContextCompat.getColor(getContext(), R.color.colorAccent));
    } else {
        compactCalendarView.setCurrentDayBackgroundColor(ContextCompat.getColor(getContext(), R.color.colorGray));
    }
}

@Override
public void onMonthScroll(Date firstDayOfNewMonth) {
    //Set the date to a sort of title textview above the view
    DateTime month = new DateTime(firstDayOfNewMonth);
    monthTv.setText(month.toString("MMMM").toUpperCase());
    compactCalendarView.setCurrentDayBackgroundColor(ContextCompat.getColor(getContext(), R.color.colorGray));
}