-converted project to Kotlin. Code can be shortened a lot, but requires some delicate work.

-fixed some time/date formatting related issues:
alamkanak#497
alamkanak#495 (but not fixed RTL alignment issue)
-created a new activity to demonstrate the paging of entire view (example: week by week snapping), based on this pull request:
Quivr#88

Author: AndroidDeveloperLB

build.gradle

@@ -1,12 +1,14 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext.kotlin_version = '1.2.41'
     repositories {
         jcenter()
         google()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.0-alpha13'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

library/build.gradle

@@ -1,4 +1,6 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
 repositories {
     mavenCentral()
@@ -19,6 +21,7 @@ configurations {
 dependencies {
     compile 'com.android.support:appcompat-v7:27.1.1'
     javadocDeps 'com.android.support:appcompat-v7:27.1.1'
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }
 
 apply from: 'gradle-mvn-push.gradle'

library/gradle-mvn-push.gradle

@@ -18,7 +18,7 @@ apply plugin: 'maven'
 apply plugin: 'signing'
 
 def isReleaseBuild() {
-    return VERSION_NAME.contains("SNAPSHOT") == false
+    return !VERSION_NAME.contains("SNAPSHOT")
 }
 
 def getReleaseRepositoryUrl() {
@@ -112,4 +112,4 @@ afterEvaluate { project ->
         archives androidSourcesJar
         // archives androidJavadocsJar
     }
-}
+}

library/src/main/AndroidManifest.xml

@@ -1 +1 @@
-<manifest package="com.alamkanak.weekview"></manifest>
+<manifest package="com.alamkanak.weekview"/>

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

@@ -1,6 +1,6 @@
 package com.alamkanak.weekview
 
-import java.util.Calendar
+import java.util.*
 
 /**
  * Created by Raquib on 1/6/2015.

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

@@ -1,14 +1,14 @@
 package com.alamkanak.weekview
 
-import java.util.Calendar
+import java.util.*
 
 class MonthLoader(var onMonthChangeListener: MonthChangeListener?) : WeekViewLoader {
 
     override fun toWeekViewPeriodIndex(instance: Calendar): Double {
         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): List<WeekViewEvent> {
+    override fun onLoad(periodIndex: Int): List<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): List<WeekViewEvent>
+        fun onMonthChange(newYear: Int, newMonth: Int): List<WeekViewEvent>?
     }
 }

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

@@ -2,11 +2,8 @@ package com.alamkanak.weekview
 
 import android.graphics.Shader
 import android.support.annotation.ColorInt
-
-import java.util.ArrayList
-import java.util.Calendar
-
 import com.alamkanak.weekview.WeekViewUtil.isSameDay
+import java.util.*
 
 /**
  * Created by Raquib-ul-Alam Kanak on 7/21/2014.
@@ -26,15 +23,13 @@ class WeekViewEvent {
 
     var id: Long
         @Deprecated("")
-        get() = java.lang.Long.parseLong(identifier!!)
+        get() = java.lang.Long.parseLong(identifier)
         @Deprecated("")
         set(id) {
             this.identifier = id.toString()
         }
 
-    constructor() {
-
-    }
+    constructor()
 
     /**
      * Initializes the event for week view.
@@ -103,7 +98,7 @@ class WeekViewEvent {
      * @param allDay    Is the event an all day event.
      * @param shader    the Shader of the event rectangle
      */
-    @JvmOverloads constructor(id: String, name: String, location: String?, startTime: Calendar, endTime: Calendar, allDay: Boolean = false, shader: Shader? = null) {
+    @JvmOverloads constructor(id: String, name: String?, location: String?, startTime: Calendar, endTime: Calendar, allDay: Boolean = false, shader: Shader? = null) {
         this.identifier = id
         this.name = name
         this.location = location
@@ -150,11 +145,11 @@ class WeekViewEvent {
     constructor(id: Long, name: String, startTime: Calendar, endTime: Calendar) : this(id, name, null, startTime, endTime) {
     }
 
-    override fun equals(o: Any?): Boolean {
-        if (this === o) return true
-        if (o == null || javaClass != o.javaClass) return false
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || javaClass != other.javaClass) return false
 
-        val that = o as WeekViewEvent?
+        val that = other as WeekViewEvent?
 
         return identifier == that!!.identifier
     }
@@ -173,7 +168,7 @@ class WeekViewEvent {
             endTime = this.startTime!!.clone() as Calendar
             endTime.set(Calendar.HOUR_OF_DAY, 23)
             endTime.set(Calendar.MINUTE, 59)
-            val event1 = WeekViewEvent(this.identifier, this.name, this.location, this.startTime, endTime, this.isAllDay)
+            val event1 = WeekViewEvent(this.identifier!!, this.name, this.location, this.startTime!!, endTime, this.isAllDay)
             event1.color = this.color
             events.add(event1)
 
@@ -187,7 +182,7 @@ class WeekViewEvent {
                 val endOfOverDay = overDay.clone() as Calendar
                 endOfOverDay.set(Calendar.HOUR_OF_DAY, 23)
                 endOfOverDay.set(Calendar.MINUTE, 59)
-                val eventMore = WeekViewEvent(this.identifier, this.name, null, overDay, endOfOverDay, this.isAllDay)
+                val eventMore = WeekViewEvent(this.identifier!!, this.name, null, overDay, endOfOverDay, this.isAllDay)
                 eventMore.color = this.color
                 events.add(eventMore)
 
@@ -199,7 +194,7 @@ class WeekViewEvent {
             val startTime = this.endTime!!.clone() as Calendar
             startTime.set(Calendar.HOUR_OF_DAY, 0)
             startTime.set(Calendar.MINUTE, 0)
-            val event2 = WeekViewEvent(this.identifier, this.name, this.location, startTime, this.endTime, this.isAllDay)
+            val event2 = WeekViewEvent(this.identifier!!, this.name, this.location, startTime, this.endTime!!, this.isAllDay)
             event2.color = this.color
             events.add(event2)
         } else {
@@ -209,41 +204,3 @@ class WeekViewEvent {
         return events
     }
 }
-/**
- * Initializes the event for week view.
- *
- * @param id        The id of the event as String.
- * @param name      Name of the event.
- * @param location  The location of the event.
- * @param startTime The time when the event starts.
- * @param endTime   The time when the event ends.
- * @param allDay    Is the event an all day event
- */
-/**
- * Initializes the event for week view.
- *
- * @param id        The id of the event.
- * @param name      Name of the event.
- * @param location  The location of the event.
- * @param startTime The time when the event starts.
- * @param endTime   The time when the event ends.
- * @param allDay    Is the event an all day event
- */
-/**
- * Initializes the event for week view.
- *
- * @param id        The id of the event as String.
- * @param name      Name of the event.
- * @param location  The location of the event.
- * @param startTime The time when the event starts.
- * @param endTime   The time when the event ends.
- */
-/**
- * Initializes the event for week view.
- *
- * @param id        The id of the event.
- * @param name      Name of the event.
- * @param location  The location of the event.
- * @param startTime The time when the event starts.
- * @param endTime   The time when the event ends.
- */

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

@@ -1,25 +1,25 @@
-package com.alamkanak.weekview
-
-import java.util.Calendar
-
-interface WeekViewLoader {
-    /**
-     * Convert a date into a double that will be used to reference when you're loading data.
-     *
-     *
-     * All periods that have the same integer part, define one period. Dates that are later in time
-     * should have a greater return value.
-     *
-     * @param instance the date
-     * @return The period index in which the date falls (floating point number).
-     */
-    fun toWeekViewPeriodIndex(instance: Calendar): Double
-
-    /**
-     * Load the events within the period
-     *
-     * @param periodIndex the period to load
-     * @return A list with the events of this period
-     */
-    fun onLoad(periodIndex: Int): List<WeekViewEvent>
-}
+package com.alamkanak.weekview
+
+import java.util.*
+
+interface WeekViewLoader {
+    /**
+     * Convert a date into a double that will be used to reference when you're loading data.
+     *
+     *
+     * All periods that have the same integer part, define one period. Dates that are later in time
+     * should have a greater return value.
+     *
+     * @param instance the date
+     * @return The period index in which the date falls (floating point number).
+     */
+    fun toWeekViewPeriodIndex(instance: Calendar): Double
+
+    /**
+     * Load the events within the period
+     *
+     * @param periodIndex the period to load
+     * @return A list with the events of this period
+     */
+    fun onLoad(periodIndex: Int): List<WeekViewEvent>?
+}