MaterialDatePicker Select Date between 2 dates only

Question

How to add a constraint to MaterialDatePicker to force user to select a date between only 2 dates?

val constraintBuilder = CalendarConstraints.Builder()
    val materialRangeBuilder = MaterialDatePicker.Builder.datePicker()
    materialRangeBuilder.setTitleText("Book Date")
    materialRangeBuilder.setCalendarConstraints(constraintBuilder.build())

    val materialRangePicker = materialRangeBuilder.build()

    materialRangePicker.addOnPositiveButtonClickListener {
        Timber.d("$it")
    }

    materialRangePicker.show(supportFragmentManager, "DATE_RANGE_PICKER")

Answer 1

You can use a DateValidator to restrict the selections.
In particular you can use the built-in validators:

• DateValidatorPointForward that enables dates from a given point forward
• DateValidatorPointBackward that enables only dates before a given point.

Something like:

MaterialDatePicker.Builder<Long> builder = MaterialDatePicker.Builder.datePicker();

CalendarConstraints.Builder constraintsBuilderRange = new CalendarConstraints.Builder();

//....define min and max for example with LocalDateTime and ZonedDateTime or Calendar

CalendarConstraints.DateValidator dateValidatorMin = DateValidatorPointForward.from(min.getTimeInMillis());
CalendarConstraints.DateValidator dateValidatorMax = DateValidatorPointBackward.before(max.getTimeInMillis());

ArrayList<CalendarConstraints.DateValidator> listValidators =
            new ArrayList<CalendarConstraints.DateValidator>();
listValidators.add(dateValidatorMin);
listValidators.add(dateValidatorMax);
CalendarConstraints.DateValidator validators = CompositeDateValidator.allOf(listValidators);
constraintsBuilderRange.setValidator(validators);

builder.setCalendarConstraints(constraintsBuilderRange.build());

MaterialDatePicker<Long> picker = builder.build();
picker.show(getSupportFragmentManager(), picker.toString());