allowed using extended classes of WeekViewEvent in various functions

Author: AndroidDeveloperLB

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.0-alpha15'
+        classpath 'com.android.tools.build:gradle:3.2.0-alpha16'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong

library/src/main/java/com/alamkanak/weekview/MonthLoader.kt

@@ -8,7 +8,7 @@ class MonthLoader(var onMonthChangeListener: MonthChangeListener?) : WeekViewLoa
         return (instance.get(Calendar.YEAR) * 12).toDouble() + instance.get(Calendar.MONTH).toDouble() + (instance.get(Calendar.DAY_OF_MONTH) - 1) / 30.0
     }
 
-    override fun onLoad(periodIndex: Int): MutableList<WeekViewEvent>? {
+    override fun onLoad(periodIndex: Int): MutableList<out WeekViewEvent>? {
         return onMonthChangeListener!!.onMonthChange(periodIndex / 12, periodIndex % 12 + 1)
     }
 
@@ -25,6 +25,6 @@ class MonthLoader(var onMonthChangeListener: MonthChangeListener?) : WeekViewLoa
          *month of the events required by the view **1 based (not like JAVA API) : January = 1 and December = 12**.
          * @return a list of the events happening **during the specified month**.
          */
-        fun onMonthChange(newYear: Int, newMonth: Int): MutableList<WeekViewEvent>?
+        fun onMonthChange(newYear: Int, newMonth: Int): MutableList<out WeekViewEvent>?
     }
 }

library/src/main/java/com/alamkanak/weekview/WeekView.kt

@@ -222,7 +222,7 @@ class WeekView @JvmOverloads constructor(context: Context, attrs: AttributeSet?
      * your custom event loader by extending WeekViewLoader.
      */
     val weekViewLoader: WeekViewLoader = PrefetchingWeekViewLoader(MonthLoader(object : MonthChangeListener {
-        override fun onMonthChange(newYear: Int, newMonth: Int): MutableList<WeekViewEvent>? {
+        override fun onMonthChange(newYear: Int, newMonth: Int): MutableList<out WeekViewEvent>? {
             return monthChangeListener?.onMonthChange(newYear, newMonth)
         }
     }))
@@ -1932,7 +1932,7 @@ class WeekView @JvmOverloads constructor(context: Context, attrs: AttributeSet?
      *
      * @param events The events to be cached and sorted.
      */
-    private fun cacheAndSortEvents(events: MutableList<WeekViewEvent>?) {
+    private fun cacheAndSortEvents(events: MutableList<out WeekViewEvent>?) {
         if (events != null)
             for (event in events)
                 cacheEvent(event)

library/src/main/java/com/alamkanak/weekview/WeekViewLoader.kt

@@ -22,5 +22,5 @@ interface WeekViewLoader {
      * @param periodIndex the period to load
      * @return A list with the events of this period
      */
-    fun onLoad(periodIndex: Int): MutableList<WeekViewEvent>?
+    fun onLoad(periodIndex: Int): MutableList<out WeekViewEvent>?
 }

sample/src/main/java/com/alamkanak/weekview/sample/BaseActivity.kt

@@ -228,7 +228,7 @@ abstract class BaseActivity : AppCompatActivity(), WeekView.EventClickListener,
         Toast.makeText(this, "Empty view" + " clicked: " + getEventTitle(date), Toast.LENGTH_SHORT).show()
     }
 
-    override fun onMonthChange(newYear: Int, newMonth: Int): MutableList<WeekViewEvent>? {
+    override fun onMonthChange(newYear: Int, newMonth: Int): MutableList<out WeekViewEvent>? {
         return null
     }
 

sample/src/main/java/com/alamkanak/weekview/sample/BasicActivity.kt

@@ -20,7 +20,7 @@ open class BasicActivity : BaseActivity() {
         weekView.typeface = ResourcesCompat.getFont(this, R.font.lato)
     }
 
-    override fun onMonthChange(newYear: Int, newMonth: Int): MutableList<WeekViewEvent>? {
+    override fun onMonthChange(newYear: Int, newMonth: Int): MutableList<out WeekViewEvent>? {
         // Populate the week view with some events.
         val events = ArrayList<WeekViewEvent>()