NumberPickerDialog android kotlin

使いたいFragmentなどでこう書く↓

override fun showDatePickerDialog() {
    DatePickerDialog.newInstance(
        requestCode = REQUEST_DATE_PICKER,
        target = this,
        editText = binding?.pageRegisterBirthdayEditText
    ).show(parentFragmentManager, DatePickerDialog.TAG)
}

DatePickerDialog自体はこう書く

class 生年月日Dialog(editText: RoundEditText?) : DialogFragment(), android.app.DatePickerDialog.OnDateSetListener {

    val editText = editText

    companion object {
        val TAG = android.app.DatePickerDialog::class.java.simpleName

        @JvmStatic
        fun newInstance(
                requestCode: Int,
                target: Fragment?,
                editText: RoundEditText?
        ): DatePickerDialog {

            val dialog = DatePickerDialog(editText)
            dialog.setTargetFragment(target, requestCode)
            return dialog
        }
    }

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val calendar = Calendar.getInstance()
        calendar.set(1980, 0, 1)
        val year =  calendar.get(Calendar.YEAR)
        val month =  calendar.get(Calendar.MONTH)
        val day =  calendar.get(Calendar.DAY_OF_MONTH)

        val dp = android.app.DatePickerDialog(
                requireContext(),
                android.R.style.Theme_Holo_Dialog,
                this,
                year,
                month,
                day
        )

        dp.datePicker.calendarViewShown = false
        return dp
    }


    override fun onDateSet(view: DatePicker?, year: Int, month: Int, dayOfMonth: Int) {
        val editTextBirthday = editText
        editTextBirthday?.setText(String.format("%d/%02d/%02d", year, month + 1, dayOfMonth))
    }
}