Display multiple dates in a calendar

I am using android app. In which I have to display some available (retrieve from web service) date time intervals in the calendar and the available date date slots will be different and the date slot color will be different and if the user clicks on one of the given dates the selected date color will be changed. I don't understand how to do this without third party libraries. I cannot use third party libraries. I used DatePickerDialog, but using that I can select any date. I cannot display the list of date slots.

Please help me. How do I resolve this request?