MaterialDatePicker get selected dates

Just use the addOnPositiveButtonClickListener listener called when the user confirms a valid selection:

For a single date picker:

picker.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener<Long>() {
      @Override public void onPositiveButtonClick(Long selection) {
        // Do something...
        //Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
        //calendar.setTimeInMillis(selection);   

      }
    });

For a range date picker:

MaterialDatePicker<Pair<Long, Long>> pickerRange = builderRange.build();
pickerRange.show(....);

pickerRange.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener<Pair<Long, Long>>() {
  @Override public void onPositiveButtonClick(Pair<Long,Long> selection) {
       Long startDate = selection.first;
       Long endDate = selection.second;
       //Do something...
  }
});