如何在MaterialDatePicker中打开之前选择的日期？

Posted 2021-04-11

• 这是我正在使用的代码。

   val picker = builder
      .setTitleText(getText(R.string.select_start_date_and_end_date))
      .setSelection(Pair((selectedStartDate ?: calendar.timeInMillis), (selectedEndDate ?: 
       calendar.timeInMillis)))
      .setTheme(AppUtils.resolveOrThrow(requireContext(), R.attr.materialCalendarTheme))
      .setInputMode(MaterialDatePicker.INPUT_MODE_CALENDAR)
      .setCalendarConstraints(constraintsBuilder)
      .build()
   picker.show(parentFragmentManager, picker.toString())
  

• 当点击正按钮时，我将数据存储为长值，就像这样。

  picker.addOnPositiveButtonClickListener {
      selectedStartDate = it.first ?: 0
      selectedEndDate = it.second ?: 0
  }
  

• 这里selectedStartDate和selectedEndDate是长变量，但是日历没有打开之前选择的日期。

答案

我找到了答案。

 val dateValidator: CalendarConstraints.DateValidator = DateValidatorPointForward.now()
    val builder = MaterialDatePicker.Builder.dateRangePicker()
    val constraintsBuilder =
        CalendarConstraints.Builder().setStart(calendar.timeInMillis)
            .setOpenAt((selectedStartDate ?: calendar.timeInMillis))
            .setValidator(dateValidator).build()

    val picker = builder
        .setTitleText(getText(R.string.select_start_date_and_end_date))
        .setSelection(
            Pair(
                (selectedStartDate ?: calendar.timeInMillis),
                (selectedEndDate ?: calendar.timeInMillis)
            )
        )
        .setTheme(AppUtils.resolveOrThrow(requireContext(), R.attr.materialCalendarTheme))
        .setInputMode(MaterialDatePicker.INPUT_MODE_CALENDAR)
        .setCalendarConstraints(constraintsBuilder)
        .build()
    picker.show(parentFragmentManager, picker.toString())

    picker.addOnPositiveButtonClickListener {

        selectedStartDate = it.first ?: 0
        selectedEndDate = it.second ?: 0

        setStartAndEndDate(selectedStartDate, selectedEndDate)
    }

• 有一个方法openAt()。谢谢。