IT WORKS

app/build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
+    id("com.google.devtools.ksp") version "1.9.0-1.0.13" // Use the latest KSP version
 }
 
 android {
@@ -50,6 +51,9 @@ android {
 }
 
 dependencies {
+    implementation (libs.androidx.room.runtime)
+    ksp (libs.androidx.room.compiler)
+
     implementation(libs.androidx.navigation.compose)
     implementation(libs.androidx.material)
 

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <application
+        android:name=".TaskApplication"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"

app/src/main/java/at/xaxa/demonstrator2/data/db/TaskEntity.kt

@@ -1,9 +1,11 @@
 package at.xaxa.demonstrator2.data.db
 
 import androidx.room.Entity
+import androidx.room.PrimaryKey
 
 @Entity(tableName = "tasks")
 data class TaskEntity(
+    @PrimaryKey
     val _id: Int = 0,
     val name :String,
     val details: String = "empty"

app/src/main/java/at/xaxa/demonstrator2/ui/AppViewModelProvider.kt

@@ -15,9 +15,5 @@ object AppViewModelProvider {
         initializer {
             DemoDetailsViewModel(this.createSavedStateHandle(), (this[APPLICATION_KEY] as TaskApplication).taskRepository)
         }
-
-        initializer {
-            DemoDetailsViewModel(this.createSavedStateHandle(), (this[APPLICATION_KEY] as TaskApplication).taskRepository)
-        }
     }
 }

gradle/libs.versions.toml

@@ -16,13 +16,17 @@ material3 = "1.2.0"
 navigationCompose = "2.8.4"
 navigationComposeVersion = "2.7.2"
 roomCommon = "2.6.1"
+roomCompiler = "2.6.1"
 roomKtx = "2.6.1"
+roomRuntime = "2.5.0"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
 androidx-material = { module = "androidx.compose.material:material", version.ref = "material" }
 androidx-navigation-compose = { module = "androidx.navigation:navigation-compose", version.ref = "navigationCompose" }
 androidx-navigation-compose-v272 = { module = "androidx.navigation:navigation-compose", version.ref = "navigationComposeVersion" }
+androidx-room-compiler = { module = "androidx.room:room-compiler", version.ref = "roomCompiler" }
+androidx-room-runtime = { module = "androidx.room:room-runtime", version.ref = "roomRuntime" }
 converter-kotlinx-serialization = { module = "com.squareup.retrofit2:converter-kotlinx-serialization", version.ref = "converterKotlinxSerialization" }
 junit = { group = "junit", name = "junit", version.ref = "junit" }
 androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }