Fix issue tasks/tasks#2870 (#1)

* Update dependencies ical4j (3.2.19) and gradle (8.10.1)

* Add android.buildFeatures.buildConfig

* Revert "task list is not optional"

This reverts commit 3fbd449.

* Uncomment task.userAgents

* Update comment

Author: devn1x

build.gradle

@@ -6,7 +6,7 @@ buildscript {
     ext.versions = [
         kotlin: '1.7.21',
         dokka: '1.7.20',
-        ical4j: '3.2.7',
+        ical4j: '3.2.19',
         // latest Apache Commons versions that don't require Java 8 (Android 7)
         commonsIO: '2.6'
     ]
@@ -17,7 +17,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.1'
+        classpath 'com.android.tools.build:gradle:8.10.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:${versions.dokka}"
     }
@@ -42,7 +42,7 @@ android {
 
     defaultConfig {
         minSdkVersion 21        // Android 5.0
-        targetSdkVersion 32     // Android 12
+        targetSdkVersion 33     // Android 13
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
@@ -73,6 +73,10 @@ android {
     sourceSets {
         main.java.srcDirs = [ "src/main/java", "opentasks-contract/src/main/java" ]
     }
+
+    buildFeatures {
+        buildConfig = true
+    }
 }
 
 dependencies {
@@ -89,9 +93,9 @@ dependencies {
     }
     // ical4j requires newer Apache Commons libraries, which require Java8. Force latest Java7 versions.
     // noinspection GradleDependency
-    api("org.apache.commons:commons-collections4:4.2") { force = true }
+    api("org.apache.commons:commons-collections4:4.2")
     // noinspection GradleDependency
-    api("org.apache.commons:commons-lang3:3.8.1") { force = true }
+    api("org.apache.commons:commons-lang3:3.8.1")
 
     // noinspection GradleDependency
     implementation "commons-io:commons-io:${versions.commonsIO}"

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,6 @@
+#Mon Jun 02 17:38:23 CEST 2025
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

src/main/java/at/bitfire/ical4android/AndroidTask.kt

@@ -43,9 +43,12 @@ import java.util.logging.Level
  *
  */
 abstract class AndroidTask(
-        val taskList: AndroidTaskList<AndroidTask>
+        private val taskListOpt: AndroidTaskList<AndroidTask>?
 ) {
 
+    val taskList: AndroidTaskList<AndroidTask>
+        get() = taskListOpt!!
+
     companion object {
         const val UNKNOWN_PROPERTY_DATA = Properties.DATA0