v3.6.1 (Feb 12, 2022)
May 23, 2019
Oct 27, 2022 (Retired)
Amin Hassani (aminography)
Amin Hassani (aminography)
Source code


Firstly, PrimeDatePicker is a tool that provides picking a single day, multiple days, and a range of days. Secondly, you can use internal elements like MonthView and CalendarView as stand-alone views in your projects.

Multiple Days | Civil
BottomSheet | Dark
Range of Days | Persian
BottomSheet | Light
Single Day | Hijri
Dialog | Light
Goto Feature | Japanese
Dialog | Dark

Table of Contents

Core Logic

The ❤️ of this library is provided by PrimeCalendar.

Main Characteristics

  • Endless Scrolling
  • Fully Customizable Views & Themes
  • Align With Material Design
  • Fluent UI
  • RTL Support
  • Landscape Support
  • Various Calendar Types
  • Various Date Picking Strategies
  • Dialog & BottomSheet Presentations
  • Fast Goto

???? Download SampleApp.apk


PrimeDatePicker is available on MavenCentral to download using build tools systems. Add the following lines to your build.gradle file:

dependencies {
    implementation 'com.aminography:primedatepicker:3.6.0'
    implementation 'com.aminography:primecalendar:1.7.0'


To enjoy PrimeDatePicker, create an instance using a builder pattern in simple 4 steps.

  1. Decide on BottomSheet or Dialog representation along with an initial calendar:
// To show a date picker with Civil dates, also today as the starting date
val today = CivilCalendar()

val datePicker = PrimeDatePicker.bottomSheetWith(today)  // or dialogWith(today)
  1. Decide on picking strategy along with passing a proper callback:
val callback = SingleDayPickCallback { day ->
    // TODO

val today = CivilCalendar()

val datePicker = PrimeDatePicker.bottomSheetWith(today)
        .pickSingleDay(callback)  // or pickRangeDays(callback) or pickMultipleDays(callback)
  1. Apply some optional configurations:

val datePicker = PrimeDatePicker.bottomSheetWith(today)
  1. Build the date picker and show it:
val callback = SingleDayPickCallback { day ->
    // TODO

val today = CivilCalendar()

val datePicker = PrimeDatePicker.bottomSheetWith(today)
        .build(), "SOME_TAG")

Java Example


SingleDayPickCallback callback = new SingleDayPickCallback() {
    public void onSingleDayPicked(PrimeCalendar singleDay) {
        // TODO

// To show a date picker with Japanese dates, also today as the starting date
PrimeCalendar today = new JapaneseCalendar();  

PrimeDatePicker datePicker = PrimeDatePicker.Companion.dialogWith(today)
    .build();, "SOME_TAG");

Builder Configurations

There are several builder functions applying relevant configurations on the date picker.

Function Picking Strategy
• minPossibleDate(minDate: PrimeCalendar) ALL
Specifies the minimum feasible date to be shown in date picker, which is selectable.
• maxPossibleDate(maxDate: PrimeCalendar) ALL
Specifies the maximum feasible date to be shown in date picker, which is selectable.
• firstDayOfWeek(firstDayOfWeek: Int) ALL
Specifies the day that should be considered as the start of the week. Possible values are: Calendar.SUNDAY, Calendar.MONDAY, etc.
• disabledDays(disabledDays: List<PrimeCalendar>) ALL
Specifies the list of disabled days, which aren't selectable.
• applyTheme(themeFactory: ThemeFactory) ALL
Specifies the theme.
• initiallyPickedSingleDay(pickedDay: PrimeCalendar) SingleDay
Specifies initially picked day when the date picker has just shown.
• initiallyPickedRangeDays(startDay: PrimeCalendar, endDay: PrimeCalendar) RangeDays
Specifies initially picked range of days when the date picker has just shown.
• autoSelectPickEndDay(autoSelect: Boolean) RangeDays
Specifies automatic selection of picking end day when the start day gets picked.
• initiallyPickedMultipleDays(pickedDays: List<PrimeCalendar>) MultipleDays
Specifies initially picked multiple days when the date picker has just shown.

Input Calendar Configurations

In addition to the builder functions, PrimeDatePicker receives some configurations from the input calendar. For example:

// shows a Persian calendar, but in English language, which leads to LTR direction
val calendar = PersianCalendar(Locale.ENGLISH).also {
    it.year = 1398                       // determines starting year
    it.month = 7                         // determines starting month
    it.firstDayOfWeek = Calendar.MONDAY  // sets first day of week to Monday

val datePicker = PrimeDatePicker.bottomSheetWith(calendar)

Customizing Theme

PrimeDatePicker is fully customizable and you can tailor it to what you desire. Almost everything you see is customizable. For example:

  • text sizes & colors
  • background & element colors
  • padding & distances
  • font typeface
  • string formatter
  • calendar animations & transition parameters
  • etc

In this way, a set of customizable theme factory classes are provided to specify theme parameters. By default, there are two concrete subclasses for the them factory:

You can override their parameters, or inherit a class from, or make your own theme factory.

Here is an example of how to override theme parameters to customize it:

val themeFactory = object : LightThemeFactory() {

    override val typefacePath: String?
        get() = "fonts/Righteous-Regular.ttf"
    override val dialogBackgroundColor: Int
        get() = getColor(R.color.yellow100)

    override val calendarViewBackgroundColor: Int
        get() = getColor(R.color.yellow100)

    override val pickedDayBackgroundShapeType: BackgroundShapeType
        get() = BackgroundShapeType.ROUND_SQUARE

    override val calendarViewPickedDayBackgroundColor: Int
        get() = getColor(R.color.green800)
    override val calendarViewPickedDayInRangeBackgroundColor: Int
        get() = getColor(R.color.green400)

    override val calendarViewPickedDayInRangeLabelTextColor: Int
        get() = getColor(R.color.gray900)

    override val calendarViewTodayLabelTextColor: Int
        get() = getColor(R.color.purple200)

    override val calendarViewWeekLabelFormatter: LabelFormatter
        get() = { primeCalendar ->
            when (primeCalendar[Calendar.DAY_OF_WEEK]) {
                Calendar.SUNDAY -> String.format("%s????", primeCalendar.weekDayNameShort)
                else -> String.format("%s", primeCalendar.weekDayNameShort)

    override val calendarViewWeekLabelTextColors: SparseIntArray
        get() = SparseIntArray(7).apply {
            val red = getColor(R.color.red300)
            val indigo = getColor(R.color.indigo500)
            put(Calendar.SATURDAY, red)
            put(Calendar.SUNDAY, red)
            put(Calendar.MONDAY, indigo)
            put(Calendar.TUESDAY, indigo)
            put(Calendar.WEDNESDAY, indigo)
            put(Calendar.THURSDAY, indigo)
            put(Calendar.FRIDAY, indigo)

    override val calendarViewShowAdjacentMonthDays: Boolean
        get() = true

    override val selectionBarBackgroundColor: Int
        get() = getColor(R.color.brown600)

    override val selectionBarRangeDaysItemBackgroundColor: Int
        get() = getColor(R.color.orange700)

Using above theme, we can transform the light theme (left picture) to the right one.

Normal Light Theme Customized Light Theme

Java Theme Customization Example

BaseThemeFactory themeFactory = new LightThemeFactory() {
    public PrimeCalendarView.FlingOrientation getCalendarViewFlingOrientation() {
        return PrimeCalendarView.FlingOrientation.HORIZONTAL;
    public int getSelectionBarBackgroundColor() {
        return super.getColor(R.color.green300);
    // Other customizations...

Customizing Texts

If you want to change some texts in PrimeDatePicker, such as a button text, the current solution is to define some strings in your project's strings.xml with equal name defined in the library's strings.xml, to override them.

Stand-Alone Views

To see how to use PrimeMonthView & PrimeCalendarView, refer to wiki page .

Change Log

The change log is available here.


Copyright 2019 Mohammad Amin Hassani.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.