如何禁用 Android MaterialDatePicker 中的未来日期？

Question

我正在尝试使用禁用未来日期的 MaterialDatePicker 创建一个简单的 DatePicker。我尝试了其他类似 Whosebug 问题的几个答案，但没有用。到目前为止，这是我的代码：-

val datePicker = MaterialDatePicker.Builder.datePicker().apply {
        setTitleText(getString(R.string.label_select_dob))
        setCalendarConstraints(limitRange().build())
    }.build()

 private fun limitRange(): CalendarConstraints.Builder {
    val calendarStart: Calendar = Calendar.getInstance()
    val calendarEnd: Calendar = Calendar.getInstance()
    val year = 1900
    val startMonth = 1
    val startDate = 1
    calendarStart.set(year, startMonth, startDate)
    calendarEnd.set(2021, 3, 27)
    val minDate: Long = calendarStart.timeInMillis
    val maxDate: Long = calendarEnd.timeInMillis

    val constraintsBuilder = CalendarConstraints.Builder()
    val validators: ArrayList<CalendarConstraints.DateValidator> = ArrayList()
    validators.add(DateValidatorPointForward.from(minDate))
    validators.add(DateValidatorPointBackward.before(maxDate))
    constraintsBuilder.setValidator(CompositeDateValidator.allOf(validators))

    return constraintsBuilder
}

Answer 1

要禁用未来日期，只需使用图书馆提供的 DateValidatorPointBackward。

今天：

val constraintsBuilder =
    CalendarConstraints.Builder()
        .setValidator(
            DateValidatorPointBackward.now())

如果您需要自定义日期（4 月 1 日之后的所有日期）：

    val calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
    calendar[Calendar.DAY_OF_MONTH] = 1
    calendar[Calendar.MONTH] = Calendar.APRIL
    val april = calendar.timeInMillis

    val constraintsBuilder =
        CalendarConstraints.Builder()
            .setValidator(
                DateValidatorPointBackward.before(april))

Answer 2

val constraintsBuilder =
            CalendarConstraints.Builder()
                .setValidator(DateValidatorPointBackward.now())

val dataPicker = MaterialDatePicker.Builder.datePicker().apply {
            setTitleText("Select Previous Dates")
            setCalendarConstraints(constraintsBuilder.build())
        }.build()

Answer 3

首先创建一个约束生成器

 val constraintsBuilder = CalendarConstraints.Builder().setValidator(DateValidatorPointBackward.now())

第二次将其传递给 setCalendarConstraints 方法

val dialog1 = MaterialDatePicker.Builder.datePicker().setCalendarConstraints(constraintsBuilder.build())

赋值给一个变量并显示

val picker = dialog1.build()
           
picker.show(adapter.getFragmentManager(), picker.toString())

有关Material日期选择器库的更多信息，您可以访问以下link：

https://material.io/components/date-pickers/android

如何禁用 Android MaterialDatePicker 中的未来日期？

How to disable future dates in Android MaterialDatePicker?

android

kotlin

material-components-android

android-datepicker