Fix null pointer when setting week day formatter via XML

- Update version number

Author: dmanluc

app/src/main/res/layout/activity_basic_calendar.xml

@@ -26,6 +26,7 @@
         app:mk_firstDayOfWeek="monday"
         app:mk_showWeekDayLabels="true"
         app:mk_showingModes="standard"
+        app:mk_weekDayLabels="@array/weekDaysCalendar"
         />
 
     <TextView

app/src/main/res/values/arrays.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string-array name="weekDaysCalendar">
+        <item>L</item>
+        <item>M</item>
+        <item>X</item>
+        <item>J</item>
+        <item>V</item>
+        <item>S</item>
+        <item>D</item>
+    </string-array>
+
+</resources>

dependencies.gradle

@@ -4,7 +4,7 @@ ext {
     targetSdkVersion = 28
     versionMajor = 1
     versionMinor = 0
-    versionPatch = 5
+    versionPatch = 6
     versionClassifier = null
     isSnapshot = true
 

library/src/main/java/com/uxsmobile/materialkalendar/presentation/ui/MaterialKalendar.kt

@@ -85,6 +85,7 @@ class MaterialKalendar
     @ShowingDateModes private var showingDateFlagModes = SHOWING_MODE_DEFAULT
     private var allowClickDaysOutsideCurrentMonth: Boolean = true
     private var allowDynamicWeeksHeightResize: Boolean = false
+    private var weekLabelsArray: Array<CharSequence>? = null
     private var shouldShowWeekDays: Boolean = true
 
     init {
@@ -118,10 +119,7 @@ class MaterialKalendar
 
             shouldShowWeekDays = a.getBoolean(R.styleable.MaterialKalendar_mk_showWeekDayLabels, true)
 
-            val weekLabelsArray: Array<CharSequence>? = a.getTextArray(R.styleable.MaterialKalendar_mk_weekDayLabels)
-            weekLabelsArray?.let {
-                setWeekDayFormatter(ArrayKalendarWeekDayDateFormatter(weekLabelsArray))
-            }
+            weekLabelsArray = a.getTextArray(R.styleable.MaterialKalendar_mk_weekDayLabels)
 
             showingDateFlagModes = a.getInteger(R.styleable.MaterialKalendar_mk_showingModes,
                                                 SHOWING_MODE_DEFAULT)
@@ -143,7 +141,11 @@ class MaterialKalendar
 
         adapter = KalendarMonthPagerAdapter(this@MaterialKalendar).apply {
             setShowingDatesMode(showingDateFlagModes)
+            weekLabelsArray?.let {
+                setWeekDayFormatter(ArrayKalendarWeekDayDateFormatter(it))
+            } ?: setWeekDayFormatter(KalendarWeekDayDateFormatter())
         }
+
         pager = KalendarPager(context).apply {
             addOnPageChangeListener(pageChangeListener)
             pageMargin = 16.dpToPx()
@@ -302,8 +304,8 @@ class MaterialKalendar
         adapter.setShowingDatesMode(flagsMode)
     }
 
-    fun setWeekDayFormatter(formatter: DateFormatter<DayOfWeek>?) {
-        adapter.setWeekDayFormatter(formatter ?: KalendarWeekDayDateFormatter())
+    fun setWeekDayFormatter(formatter: DateFormatter<DayOfWeek>) {
+        adapter.setWeekDayFormatter(formatter)
     }
 
     fun setAllowClickDaysOutsideCurrentMonth(enable: Boolean) {