Android DateTimePicker (MaterialDatePicker + MaterialTimePicker)

README.md

Android DateTimePicker (MaterialDatePicker + MaterialTimePicker)

The DateTimePicker class combines the MaterialDatePicker and MaterialTimePicker provided by the AndroidX library to create a picker for both date and time. This class simplifies the creation of a DateTimePicker by handling the interaction between both pickers and providing a structured DateTime object via a callback when the user selects a date and time.

When the show() method is called with a FragmentManager and tag, the DateTimePicker displays the MaterialDatePicker and the MaterialTimePicker one after the other. When the user selects a date and time, the onDateTimeSelectedListener callback is called with a DateTime object that contains the selected year, month, day, hour, minute, and a Calendar object representing the selected date and time.

Usage

val datePicker = MaterialDatePicker.Builder.datePicker()
    .build()

val timePicker = MaterialTimePicker.Builder()
    .build()

val dateTimePicker = DateTimePicker(datePicker, timePicker)
dateTimePicker.show(parentFragmentManager, "DATE_TIME_PICKER_TAG")
dateTimePicker.setOnDateTimeSelectedListener { dateTime ->
    // Do whatever you want with dateTime
}

DateTimePicker.kt

import androidx.fragment.app.FragmentManager
import com.google.android.material.datepicker.MaterialDatePicker
import com.google.android.material.timepicker.MaterialTimePicker
import java.util.Calendar

class DateTimePicker(
    private val datePicker: MaterialDatePicker<Long>,
    private val timePicker: MaterialTimePicker
) {
    private var onDateTimeSelectedListener: ((dateTime: DateTime) -> Unit)? = null

    data class DateTime(
        val year: String,
        val monthOfYear: String,
        val dayOfMonth: String,
        var hourOfDay: String,
        val minuteOfHour: String,
        var calendar: Calendar
    )

    fun show(fragmentManager: FragmentManager, tag: String) {
        datePicker.show(fragmentManager, "${tag}_DATE_PICKER")

        datePicker.addOnPositiveButtonClickListener { selectionInMillis ->
            timePicker.show(fragmentManager, "${tag}_TIME_PICKER")

            timePicker.addOnPositiveButtonClickListener {
                val calendar = Calendar.getInstance()

                calendar.timeInMillis = selectionInMillis
                calendar.set(Calendar.HOUR_OF_DAY, timePicker.hour)
                calendar.set(Calendar.MINUTE, timePicker.minute)

                onDateTimeSelectedListener?.invoke(calendarToDateTime(calendar))
            }
        }
    }

    fun setOnDateTimeSelectedListener(listener: (dateTime: DateTime) -> Unit) {
        onDateTimeSelectedListener = listener
    }

    private fun calendarToDateTime(calendar: Calendar): DateTime {
        return DateTime(
            year = leadZero(calendar.get(Calendar.YEAR), 4),
            monthOfYear = leadZero(calendar.get(Calendar.MONTH)),
            dayOfMonth = leadZero(calendar.get(Calendar.DAY_OF_MONTH)),
            hourOfDay = leadZero(calendar.get(Calendar.HOUR_OF_DAY)),
            minuteOfHour = leadZero(calendar.get(Calendar.MINUTE)),
            calendar = calendar
        )
    }

    private fun leadZero(value: Int, zeroCount: Int = 2): String {
        return String.format("%0${zeroCount}d", value)
    }
}