SpinnerDatePickerDialogFragment

spinner_date_picker_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<DatePicker xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:calendarViewShown="false"
    android:datePickerMode="spinner"
    android:spinnersShown="true" />

SpinnerDatePickerDialogFragment.kt

import android.app.Dialog
import android.content.Context
import android.os.Bundle
import android.support.v7.app.AlertDialog
import android.support.v7.app.AppCompatDialogFragment
import android.text.format.DateUtils
import android.view.View
import android.widget.DatePicker
import icepick.Icepick
import icepick.State
import java.util.Calendar
import java.util.Date

class SpinnerDatePickerDialogFragment : AppCompatDialogFragment(), DatePicker.OnDateChangedListener {
    companion object {
        @JvmField val TAG: String = SpinnerDatePickerDialogFragment::class.java.simpleName

        private const val ARGS_YEAR = "year"
        private const val ARGS_MONTH = "month"
        private const val ARGS_DAY = "day"

        @JvmStatic
        fun newInstance(year: Int, monthOfYear: Int, dayOfMonth: Int) = SpinnerDatePickerDialogFragment().apply {
            arguments = Bundle().apply {
                putInt(ARGS_YEAR, year)
                putInt(ARGS_MONTH, monthOfYear)
                putInt(ARGS_DAY, dayOfMonth)
            }
        }
    }

    private var onDateSetListener: OnDateSetListener? = null

    @State @JvmField internal var year = 0
    @State @JvmField internal var monthOfYear = 0
    @State @JvmField internal var dayOfMonth = 0

    override fun onAttach(context: Context?) {
        super.onAttach(context)
        onDateSetListener = when {
            context is OnDateSetListener -> context
            parentFragment is OnDateSetListener -> parentFragment as OnDateSetListener
            else -> throw IllegalArgumentException("The context or parent fragment must implement "
                    + OnDateSetListener::class.java)
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        Icepick.restoreInstanceState(this, savedInstanceState)
    }

    override fun onSaveInstanceState(outState: Bundle?) {
        super.onSaveInstanceState(outState)
        Icepick.saveInstanceState(this, outState)
    }

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        if (savedInstanceState == null) {
            year = arguments.getInt(ARGS_YEAR)
            monthOfYear = arguments.getInt(ARGS_MONTH)
            dayOfMonth = arguments.getInt(ARGS_DAY)
        }

        val datePicker = (View.inflate(context, R.layout.spinner_date_picker_dialog, null) as DatePicker).also {
            it.init(year, monthOfYear, dayOfMonth, this)
            it.maxDate = Date().time
        }
        return AlertDialog.Builder(context)
                .setTitle(getTitle(year, monthOfYear, dayOfMonth))
                .setView(datePicker)
                .setPositiveButton(R.string.ok, { _, _ ->
                    onDateSetListener?.onDateSet(datePicker, datePicker.year, datePicker.month, datePicker.dayOfMonth)
                })
                .create()
    }

    override fun onDateChanged(view: DatePicker?, year: Int, monthOfYear: Int, dayOfMonth: Int) {
        this.year = year
        this.monthOfYear = monthOfYear
        this.dayOfMonth = dayOfMonth
        dialog?.setTitle(getTitle(year, monthOfYear, dayOfMonth))
    }

    private fun getTitle(year: Int, monthOfYear: Int, dayOfMonth: Int) = DateUtils.formatDateTime(
            context,
            Calendar.getInstance().apply {
                set(Calendar.YEAR, year)
                set(Calendar.MONTH, monthOfYear)
                set(Calendar.DAY_OF_MONTH, dayOfMonth)
            }.timeInMillis,
            DateUtils.FORMAT_SHOW_DATE or DateUtils.FORMAT_SHOW_YEAR or DateUtils.FORMAT_ABBREV_MONTH
    )

    interface OnDateSetListener {
        fun onDateSet(view: DatePicker, year: Int, monthOfYear: Int, dayOfMonth: Int)
    }
}