CalendarView

Introduction: A highly customizable calendar library for Android, powered by RecyclerView.
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A highly customizable calendar library for Android, powered by RecyclerView.

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With this library, your calendar will look however you want it to.

Preview

Features

  • [x] Single or range selection - The library provides the calendar logic which enables you to implement the view whichever way you like.
  • [x] Week or month mode - show 1 row of weekdays, or any number of rows from 1 to 6.
  • [x] Boundary dates - limit the calendar date range.
  • [x] Custom date view - make your day cells look however you want, with any functionality you want.
  • [x] Custom calendar view - make your calendar look however you want, with whatever functionality you want.
  • [x] Use any day as the first day of the week.
  • [x] Horizontal or vertical scrolling mode.
  • [x] Add headers/footers of any kind on each month.
  • [x] Easily scroll to any date or month view using the date.
  • [x] Use all RecyclerView customisations(decorators etc) since CalendarView extends from RecyclerView.
  • [x] Design your calendar however you want. The library provides the logic, you provide the views.

Sample project

It's very important to check out the sample app. Most techniques that you would want to implement are already implemented in the examples.

Download the sample app here

View the sample app's source code here

Usage

Step 1

The library uses java.time classes via ThreeTenABP for backward compatibility since these classes were added in Java 8. Therefore, you need to initialize ThreeTenABP in your application class.

class SampleApp : Application() {
    override fun onCreate() {
        super.onCreate()
        AndroidThreeTen.init(this)
    }
}

Add CalendarView to your XML like any other view.

<com.kizitonwose.calendarview.CalendarView
    android:id="@+id/calendarView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cv_dayViewResource="@layout/calendar_day_layout" />

See all available attributes.

Step 2

Create your day view resource in res/layout/calendar_day_layout.xml.

<TextView
    android:id="@+id/calendarDayText"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:textSize="16sp"
    tools:text="22" />

Create your view container which acts as a view holder for each date cell. The view passed in here is the inflated day view resource which you provided.

class DayViewContainer(view: View) : ViewContainer(view) {
    val textView = view.calendarDayText

    // Without the kotlin android extensions plugin
    // val textView = view.findViewById<TextView>(R.id.calendarDayText)
}

Provide a DayBinder for the CalendarView using your DayViewContainer type.

calendarView.dayBinder = object : DayBinder<DayViewContainer> {
    // Called only when a new container is needed.
    override fun create(view: View) = DayViewContainer(view)

    // Called every time we need to reuse a container.
    override fun bind(container: DayViewContainer, day: CalendarDay) {
        container.textView.text = day.date.dayOfMonth.toString()
    }
}

Step 3

Setup the desired dates in your Fragment or Activity:

val currentMonth = YearMonth.now()
val firstMonth = currentMonth.minusMonths(10)
val lastMonth = currentMonth.plusMonths(10)
val firstDayOfWeek = WeekFields.of(Locale.getDefault()).firstDayOfWeek
calendarView.setup(firstMonth, lastMonth, firstDayOfWeek)
calendarView.scrollToMonth(currentMonth)

And that's all you need for a simple usage!

To add a header or footer to each month, the procedure is the same. Just provide your monthHeaderResource or monthFooterResource attribute, then set the monthHeaderBinder or monthFooterBinder property of the CalendarView. For more complex usages, please see the sample project.

In the example above, we get the first day of the week from the current locale, however, we can use a specific day regardless of locale by passing in the value DayOfWeek.SUNDAY, DayOfWeek.MONDAY etc

Attributes

XML (All prefixed cv_ for clarity)

  • dayViewResource: The xml resource that is inflated and used as the day cell view. This must be provided.

  • monthHeaderResource: The xml resource that is inflated and used as a header for every month.

  • monthFooterResource: The xml resource that is inflated and used as a footer for every month.

  • orientation: The calendar orientation, can be horizontal or vertical. Default is vertical.

  • scrollMode: The scrolling behavior of the calendar. Can be paged or continuous. If paged, the calendar will snap to the nearest month after a scroll or swipe action. Default value is continuous.

  • maxRowCount: The maximum number of rows(1 to 6) to show on each month. If a month has a total of 6 rows and maxRowCount is set to 4, there will be two appearances of that month on the calendar, the first one will show 4 rows and the second one will show the remaining 2 rows. To show a week mode calendar, set this value to 1, you may also want to set hasBoundaries to false so dates can overflow into the previous/next month for a better experience.

  • hasBoundaries: Determines if dates of a month should stay in its section or can flow into another month's section. If true, a section can only contain dates belonging to that month, its inDates and outDates. if false, the dates are added continuously, irrespective of month sections.

    When this property is false, a few things behave slightly differently:

    • If inDateStyle is either allMonths or firstMonth, only the first index will contain inDates.
    • If outDateStyle is either endOfRow or endOfGrid, only the last index will contain outDates.
    • If outDateStyle is endOfGrid, outDates are generated for the last index until it satisfies the maxRowCount requirement.
  • inDateStyle: This Determines how inDates are generated for each month on the calendar. If set to allMonths, the calendar will generate inDates for all months, if set to firstMonth inDates will be generated for the first month only and if set to none, inDates will not be generated, this means that there will be no offset on any month.

  • outDateStyle: This determines how outDates are generated for each month on the calendar. If endOfRow, the calendar will generate outDates until it reaches the first end of a row. This means that if a month has 6 rows, it will display 6 rows and if a month has 5 rows, it will display 5 rows. However, if this value is set to endOfGrid, the calendar will generate outDates until it reaches the end of a 6 x 7 grid. This means that all months will have 6 rows.

If you are wondering what outDates and inDates mean, let's use the screenshot below as an example.

inDate and outDates

In the image, the dates within the green annotation are inDates, the ones within the red annotation are outDates while those without annotation are monthDates. You can check for this when binding your calendar. To achieve the exact effect on the image, we do this:

calendarView.dayBinder = object : DayBinder<DayViewContainer> {
    override fun create(view: View) = DayViewContainer(view)
    override fun bind(container: DayViewContainer, day: CalendarDay) {
        container.textView.text = day.date.dayOfMonth.toString()
        if (day.owner == DayOwner.THIS_MONTH) {
            container.textView.setTextColor(Color.WHITE)
        } else {
            container.textView.setTextColor(Color.GRAY)
        }
    }
}

inDates have their owner property set to DayOwner.PREVIOUS_MONTH

outDates have their owner property set to DayOwner.NEXT_MONTH

monthDates have their owner property set to DayOwner.THIS_MONTH as seen in the code snippet above.

Properties

  • monthScrollListener: Called when the calendar scrolls to a new month. Mostly beneficial if scrollMode is paged.

  • dayBinder: An instance of DayBinder for managing day cell views.

  • monthHeaderBinder: An instance of MonthHeaderFooterBinder for managing header views.

  • monthFooterBinder: An instance of MonthHeaderFooterBinder for managing footer views.

  • dayWidth: The width, in pixels for each day cell view.

  • dayHeight: The height, in pixels for each day cell view.

Note that setting either dayWidth or dayHeight to CalendarView.DAY_SIZE_SQUARE makes the day cells have equal width and height which is basically the width of the calendar divided by 7. DAY_SIZE_SQUARE is the default day width and height value.

Methods

  • scrollToDate(date: LocalDate): Scroll to a specific date on the calendar. Use smoothScrollToDate() to get a smooth scrolling animation.

  • scrollToMonth(month: YearMonth): Scroll to a month on the calendar. Use smoothScrollToMonth() to get a smooth scrolling animation.

  • notifyDateChanged(date: LocalDate): Reload the view for the specified date.

  • notifyMonthChanged(month: YearMonth): Reload the header, body and footer views for the specified month.

  • notifyCalendarChanged(): Reload the entire calendar.

There's no need listing all available methods or repeating the documentation here. Please see the CalendarView class for all properties and methods available with proper documentation.

Week view and Month view

This library has no concept of week/month view. You'll need to configure the calendar to mimic this behavior by changing its state between a 6 or 1 row calendar, depending on your needs. This feature can be seen in Example 1 in the sample app. In summary, here's what you need:

// Common configurations for both modes.
calendarView.inDateStyle = InDateStyle.ALL_MONTHS
calendarView.outDateStyle = OutDateStyle.END_OF_ROW
calendarView.scrollMode = ScrollMode.PAGED
calendarView.orientation = RecyclerView.HORIZONTAL

val monthToWeek = monthViewCheckBox.isChecked
if (monthToWeek) { 
    // One row calendar for week mode
    calendarView.maxRowCount = 1
    calendarView.hasBoundaries = false
} else {
    // Six row calendar for month mode
    calendarView.maxRowCount = 6
    calendarView.hasBoundaries = true
}

With the configuration above, you get the result below:

Week and month modes

If you wish to animate height changes on the CalendarView when switching between week and month modes, please see Example 1 in the sample app where we use a ValueAnimator, of course you can use whichever animation logic you prefer.

You can also set hasBoundaries to true for a week mode calendar. This helps the library make very few optimizations, however, you should also change scrollMode to ScrollMode.CONTINUOUS as pagination behavior may not be as expected due to boundary limitations. See Example 7 in the sample app for a week mode calendar with this configuration, a screenshot is shown below:

Week mode

Remember that all the screenshots above are just examples of what you can achieve with this library and you can absolutely build your calendar to look however you want.

Made a cool calendar with this library? Share an image here.

Setup

Gradle

Add the JitPack repository to your project level build.gradle:

allprojects {
 repositories {
    google()
    jcenter()
    maven { url "https://jitpack.io" }
 }
}

Add this to your app build.gradle:

dependencies {
    implementation 'com.github.kizitonwose:CalendarView:<latest-version>'
}

Note: <latest-version> value can be found on the JitPack badge above the preview images.

Contributing

Found a bug? feel free to fix it and send a pull request or open an issue.

Inspiration

CalendarView was inspired by the iOS library JTAppleCalendar. I used JTAppleCalendar in an iOS project but couldn't find anything as customizable on Android so I built this. You'll find some similar terms like InDateStyle, OutDateStyle, DayOwner etc.

License

CalendarView is distributed under the MIT license. See LICENSE for details.

Apps
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GitHub: Trinea