Android Material Date Picker setting min, max date

CalendarConstraints

MaterialDatePicker 의 setCalendarConstraints() 메소드

MaterialDatePicker.Builder.datePicker().setCalendarConstraints([CalendarConstraints])

CalendarConstraints 의 setValidator() 메소드를 사용한다.

CalendarConstrains.Builder().setValidator([DateValidator]).build()

Set max date

DateValidatorPointBackward

CalendarConstraints.Builder()
	.setValidator(DateValidatorPointBackward.now()).build()

Set min date

DateValidatorPointForward

CalendarConstraints.Builder()
            .setValidator(DateValidatorPointForward.now()).build()

Set max month

달력의 최대값을(month 단위) 설정해 달력이 다음 달로 넘어가지 않도록 해준다.
CalendarConstraints.Builder.setEnd()

val calendar = Calendar.getInstance()
val presentMonth = calendar.timeInMillis

CalendarConstraints.Builder().setEnd(presentMonth)

Set min month

달력의 최소값을(month 단위) 설정해 달력이 이전 달로 넘어가지 않도록 해준다.
CalendarConstraints.Builder.setStart()

val calendar = Calendar.getInstance()
val presentMonth = calendar.timeInMillis

CalendarConstraints.Builder().setStart(presentMonth)

최종 코드

private fun showDatePicker(
    activity : AppCompatActivity,
    date: LocalDateTime?,
    isBirthDay: Boolean,
    updatedDate: (LocalDateTime) -> Unit)
{
    val selection = date?.atZone(ZoneId.of("UTC"))
    val selectionMs = selection?.toInstant()?.toEpochMilli()

    val calendar = Calendar.getInstance()
    val presentMonth = calendar.timeInMillis
    val upTo = calendar.timeInMillis.plus(172800000) //min date 설정. 오늘포함 3일 이후로 날짜 선택 가능

    val constraints: CalendarConstraints = if (isBirthDay) {
        // set max month and date
        CalendarConstraints.Builder().setEnd(presentMonth)
            .setValidator(DateValidatorPointBackward.now()).build()
    } else {
        // set min month and date
        CalendarConstraints.Builder().setStart(presentMonth)
            .setValidator(DateValidatorPointForward.from(upTo)).build()
    }

    val picker = MaterialDatePicker.Builder.datePicker()
        .setCalendarConstraints(constraints)
        .setSelection(selectionMs)
        .build()
    picker.show(activity.supportFragmentManager, "picker")
    picker.addOnPositiveButtonClickListener {
        val date = LocalDateTime.ofInstant(
            Instant.ofEpochMilli(it), ZoneId.of("UTC")
        )
        updatedDate(date)
    }
}