¿Cómo usar DatePickerDialog en Kotlin?

Solución:

Se vería así:

val c = Calendar.getInstance()
val year = c.get(Calendar.YEAR)
val month = c.get(Calendar.MONTH)
val day = c.get(Calendar.DAY_OF_MONTH)


val dpd = DatePickerDialog(activity, DatePickerDialog.OnDateSetListener { view, year, monthOfYear, dayOfMonth ->

    // Display Selected date in textbox
    lblDate.setText("" + dayOfMonth + " " + MONTHS[monthOfYear] + ", " + year)

}, year, month, day)

dpd.show()

esto se hizo simplemente copiando y pegando el código en un archivo kotlin en Android Studio. Recomiendo encarecidamente su uso.

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val textView: TextView  = findViewById(R.id.textView_date)
        textView.text = SimpleDateFormat("dd.MM.yyyy").format(System.currentTimeMillis())

        var cal = Calendar.getInstance()

        val dateSetListener = DatePickerDialog.OnDateSetListener { view, year, monthOfYear, dayOfMonth ->
            cal.set(Calendar.YEAR, year)
            cal.set(Calendar.MONTH, monthOfYear)
            cal.set(Calendar.DAY_OF_MONTH, dayOfMonth)

            val myFormat = "dd.MM.yyyy" // mention the format you need
            val sdf = SimpleDateFormat(myFormat, Locale.US)
            textView.text = sdf.format(cal.time)

        }

        textView.setOnClickListener {
            DatePickerDialog([email protected], dateSetListener,
                    cal.get(Calendar.YEAR),
                    cal.get(Calendar.MONTH),
                    cal.get(Calendar.DAY_OF_MONTH)).show()
        }
    }
}

Ejemplo de Android de Kotlin Anko:

alert {

    isCancelable = false

    lateinit var datePicker: DatePicker

    customView {
        verticalLayout {
            datePicker = datePicker {
                maxDate = System.currentTimeMillis()
            }
        }
    }

    yesButton {
        val parsedDate = "${datePicker.dayOfMonth}/${datePicker.month + 1}/${datePicker.year}"
    }

    noButton { }

}.show()

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