Android is already packed with great Calender and Timepicker to add-in application. Which most of the time fulfill basic requirements needs of a project. But some times few challenges come on ways which call for more flexibilities in Calander date pickers.
A few days back I was working on a project with Booking appointment module. There was a requirement to disable all Sundays and Saturdays in calendar datepicker dialog so that nobody will be able to select disabled dates. But there is no possibility to achieve that in traditional datepicker Calender.