DatePicker

MaterialDatePicker from Material Components

• See official documentation here. Extends DialogFragment.
• Also does not seem to support highlighting of multiple dates.
• However, useful for design tips. (See here.)

com.aminography:primedatepicker (>300 stars on GitHub)

• Does not support selection of years.

com.wdullaer:materialdatetimepicker (4.6k stars on GitHub)

• Looks really promising! Allows year selection, date disabling, and date highlighting (dot underneath number of date).