var selectedDate = Calendar.getInstance()
  var calendarView = findViewBydId(R.id.calendar_view)

  calendarView.builder()
      .withYearPanel(
          dateFormat = "yyyy",
          textColor = R.color.greyed_out,
          textSize = 42f,
          font = R.font.titillium_web_semibold
      )
      .withBackButton(
          isShow = true,
          background = R.drawable.ic_up_round
      )
      .withMonthPanel(
          font = R.font.titillium_web_semibold,
          textSize = 20f,
          selectedTextColor = R.color.black,
          unSelectedTextColor = R.color.greyed_out,
          background = R.color.white,
          months = months
      )
      .withWeekPanel(
          font = R.font.titillium_web_semibold,
          textColor = R.color.black,
          textSize = 14f,
          background = R.color.white,
          weekDays = weekDays
      )
      .withDayPanel(
          font = R.font.titillium_web_semibold,
          textColor = R.color.black,
          textSize = 16f,
          selectedTextColor = R.color.white,
          selectedBackground = R.drawable.ic_green_oval,
          background = R.color.white
      )
      .withCalenderViewBg(
          background = R.drawable.rect_lr_wround_bg
      )
      .withUpdateSelectDate(selectedDate!!) //It's required when using kotlin Instead of XML Configuration.
      .withEvents(
          events = events,
          eventDotColor = R.color.green
      )
      .buildCalendar()

      .withYearPanleMargin(
         top = 12,
         bottom = 15,
         left = 12,
         right = 12
      )
      .withMonthPanleMargin(
         top = 12,
         bottom = 15,
         left = 12,
         right = 12
      )
      .withWeekPanelMargin(
         top = 12,
         bottom = 15,
         left = 12,
         right = 12
      )
      .withDayPanelMargin(
         top = 12,
         bottom = 15,
         left = 12,
         right = 12
      )

  var calendarView = findViewBydId(R.id.calendar_view)

  calendarView.builder()
      .withEvents(events, R.color.green)
      .buildCalendar()

calendarView.setEventHandler(object : CalenderViewInterface.EventHandler {

    override fun onDayClick(view: View?, date: Date, position: Int) {
        val df = SimpleDateFormat.getDateInstance()
        //Required for selected date background. Ignore If you are using XML configuration.
        selectedDate = Calendar.getInstance().apply {
           time = date
        }
        Toast.makeText(this@MainActivity, df.format(date), Toast.LENGTH_SHORT).show()
        Log.e("TEST", "onDayClick")
    }

    override fun onDayLongClick(view: View?, date: Date, position: Int) {
        val df = SimpleDateFormat.getDateInstance()
        Toast.makeText(this@MainActivity, df.format(date), Toast.LENGTH_SHORT).show()
        Log.e("TEST", "onDayLongClick")
    }

    override fun onBackClick(view: View?) {
        Log.e("TEST", "onBackClick")
        dialog?.dismiss()
    }

    override fun onMonthClick(view: View?, month: String, position: Int) {
        Toast.makeText(this@MainActivity, month, Toast.LENGTH_SHORT).show()
        Log.e("TEST", "onMonthClick")
    }
})

        var dialog = CalendarViewDialog(this) // this is context
        dialog!!.setCancelable(false)
        dialog!!.show()
        var calendarView = dialog!!.getCalendarView()
        // Follow 1.3 Step. It is same configuration.