Develop Reference

Extension of type 'LibraryExtension' does not exist

I created a gradle plugin to unify some settings between the various modules of the application. the summary of the error is this:
org.gradle.api.plugins.InvalidPluginException: An exception occurred applying plugin request [id: 'common.plugin']
Caused by: org.gradle.api.UnknownDomainObjectException: Extension of type 'LibraryExtension' does not exist. Currently registered extension types: [ExtraPropertiesExtension,....]
This is a summary image of the project architecture:
CommonPluginClass:
class CommonPluginClass : Plugin<Project> {
private val consumerProguardFileName = "consumer-rules.pro"
private val proguardFileName = "proguard-rules.pro"
private val sdkToCompile = 33
override fun apply(project: Project) {
println(">>> Adding sugar to gradle files!")
with(project)
{
applyPlugins(this)
androidConfig(this)
}
println(">>> Sugar added for core Module!")
}
private fun applyPlugins(project: Project) {
println(">>> apply plugins!")
project.pluginManager.run {
apply("com.android.application")
apply("kotlin-android")
apply("kotlin-kapt")
}
println(">>> end apply plugins!")
}
private fun androidConfig(project: Project) {
project.extensions.configure<LibraryExtension>{
defaultConfig.targetSdk = 33
}
}
}
the error occurs inside the androidConfig function when calling configure
I was inspired by now android, dependencies and imports are similar but not build. Can someone unlock it please.
build-logic:convention build.gradle
plugins {
alias(libs.plugins.kotlin.jvm) apply false
id "org.gradle.kotlin.kotlin-dsl" version "2.4.1"
}
dependencies {
compileOnly(libs.android.pluginGradle)
compileOnly(libs.kotlin.pluginGradle)
}
gradlePlugin {
plugins {
commonPlugin {
id = "common.plugin"
implementationClass = "CommonPluginClass"
}
}
}
LITTLE UPDATE:
I've noticed that any module I enter always identifies it to me as ApplicationExtension

I found the solution and as usual it's a stupid thing.
the application extension use plugin
apply("com.android.application")
the library or module use plugin
apply("com.android.library")

Kotlin Multiplatform: Can't reference class in commonMain sourceset from another module's androidMain sourceset

I have two multiplatform modules shared and other in a standard multiplatform template project that targets Android and iOS.
shared defines a class in commonMain source set
class SharedGreeting()
other is setup to depend on shared like this in the gradle file:
val commonMain by getting {
dependencies {
implementation(project(":shared"))
}
}
And in its androidMain sourceset it tries to reference SharedGreeting in some class, fx:
class AndroidGreeter{
val foo = SharedGreeting()
}
But no matter what I try, I get IDE errors when I try to reference the shared class, and I have to manually add an import statement.
The code compiles and deploys without problems though!
Any ideas on what I am missing or misunderstanding? Or is this a bug in KMM?
Full copy of other gradle file:
plugins {
kotlin("multiplatform")
kotlin("native.cocoapods")
id("com.android.library")
}
version = "1.0"
kotlin {
android()
iosX64()
iosArm64()
iosSimulatorArm64()
cocoapods {
summary = "Some description for the Shared Module"
homepage = "Link to the Shared Module homepage"
ios.deploymentTarget = "14.1"
framework {
baseName = "other"
}
}
sourceSets {
val commonMain by getting {
dependencies {
implementation(project(":shared"))
}
}
val commonTest by getting {
dependencies {
implementation(kotlin("test"))
}
}
val androidMain by getting
val androidTest by getting
val iosX64Main by getting
val iosArm64Main by getting
val iosSimulatorArm64Main by getting
val iosMain by creating {
dependsOn(commonMain)
iosX64Main.dependsOn(this)
iosArm64Main.dependsOn(this)
iosSimulatorArm64Main.dependsOn(this)
}
val iosX64Test by getting
val iosArm64Test by getting
val iosSimulatorArm64Test by getting
val iosTest by creating {
dependsOn(commonTest)
iosX64Test.dependsOn(this)
iosArm64Test.dependsOn(this)
iosSimulatorArm64Test.dependsOn(this)
}
}
}
android {
compileSdk = 32
sourceSets["main"].manifest.srcFile("src/androidMain/AndroidManifest.xml")
defaultConfig {
minSdk = 24
targetSdk = 32
}
}
For full project source code:
https://github.com/RabieJradi/kmm_import_error_sample
IDE suggested action for adding a dependency doesn't unfortunately do anything.

Turns out it is a bug in KMM and a fix have been implemented by the Jetbrains team here https://youtrack.jetbrains.com/issue/KTIJ-22056/KMM-Cant-reference-shared-module-commonMain-source-set-classes-from-another-modules-androidMain-source-set

You cannot do this in that way.
To make your project work you have to work with expect and actual words.
So, make these changes:
change your SharedGreeting class in shared module like that:
expect class SharedGreeting {
fun greeting(): String
}
Then your IDE wants you to make two changes, in shared module.
Add a class in both modules, iosMain and androidMain named SharedGreeting. The code is the same for both classes:
actual class SharedGreeting {
actual fun greeting(): String {
return "Hello, ${Platform().platform}!"
}
}
The work is done, now your other library has no errors. From your androidMain module inside "other" you can work only on other androidMain modules inside other MKK libraries.

Actual/Expect classes doesn't work in Kotlin Mutliplatform proyect

I was develoing an KMM App, where I try to implement a regular localDatasource and remoteDatasource, using SQLDelight and Ktor respectively.
My problems comes when I try to shared the native code from AndroidApp and iosMain, into commonModule. I start to get the following error into my commonModule expect class:
Expected function 'cache' has no actual declaration in module KMM-APP.shared for JVM
Expected function 'cache' has no actual declaration in module KMM-APP.shared.iosArm64Main for Native
Expected function 'cache' has no actual declaration in module KMM-APP.shared.iosX64Main for Native
It's a bit confuse, in order I don't make use of jvm module in my proyect, although I do for IOS module.
Here it's my cacheAndroid.kt of AndroidApp module:
import android.content.Context
import com.example.kmp_app.db.PetsDatabase
import com.squareup.sqldelight.android.AndroidSqliteDriver
lateinit var appContext: Context
internal actual fun cache(): PetsDatabase {
val driver = AndroidSqliteDriver(PetsDatabase.Schema, appContext, "petsDB.db")
return PetsDatabase(driver)
}
Here is the classes of my IOS module:
import com.example.kmp_app.db.PetsDatabase
import com.squareup.sqldelight.drivers.native.NativeSqliteDriver
internal actual fun cache(): PetsDatabase {
val driver = NativeSqliteDriver(PetsDatabase.Schema, "petsDB.db")
return PetsDatabase(driver)
}
And the use into commonModule:
internal expect fun cache(): PetsDatabase
I in this last line of code where I reciving the error above, but I also get the error into the actual classes of Android and IOS modules, into their expect class variant.
Finally regarding my build.gradle(common)
plugins {
kotlin("multiplatform")
kotlin("native.cocoapods")
id("com.android.library")
id("kotlinx-serialization")
id("com.squareup.sqldelight")
}
version = "1.0"
kotlin {
targets{
ios {
binaries {
framework {
baseName = "shared"
}
}
}
// Block from https://github.com/cashapp/sqldelight/issues/2044#issuecomment-721299517.
val onPhone = System.getenv("SDK_NAME")?.startsWith("iphoneos") ?: false
if (onPhone) {
iosArm64("ios")
} else {
iosX64("ios")
}
android()
//iosSimulatorArm64() sure all ios dependencies support this target
}
cocoapods {
summary = "Some description for the Shared Module"
homepage = "Link to the Shared Module homepage"
ios.deploymentTarget = "14.1"
podfile = project.file("../iosApp/Podfile")
}
sourceSets {
all {
languageSettings.apply {
useExperimentalAnnotation("kotlinx.coroutines.ExperimentalCoroutinesApi")
}
}
val commonMain by getting{
dependencies {
implementation(kotlin("stdlib-common"))
implementation(Coroutines.Core.core)
implementation(Ktor.Core.common)
implementation(Ktor.Json.common)
implementation(Ktor.Logging.common)
implementation(Ktor.Serialization.common)
implementation(SqlDelight.runtime)
}
}
val commonTest by getting {
dependencies {
implementation(kotlin("test-common"))
implementation(kotlin("test-annotations-common"))
implementation(Ktor.Mock.common)
}
}
val androidMain by getting{
dependencies {
implementation(kotlin("stdlib"))
implementation(Coroutines.Core.core)
implementation(Ktor.android)
implementation(Ktor.Core.jvm)
implementation(Ktor.Json.jvm)
implementation(Ktor.Logging.jvm)
implementation(Ktor.Logging.slf4j)
implementation(Ktor.Mock.jvm)
implementation(Ktor.Serialization.jvm)
implementation(Serialization.core)
implementation(SqlDelight.android)
}
}
val androidAndroidTestRelease by getting
val androidTest by getting {
dependsOn(androidAndroidTestRelease)
dependencies {
implementation(kotlin("test-junit"))
implementation("junit:junit:4.13.2")
}
}
val iosX64Main by getting
val iosArm64Main by getting
//val iosSimulatorArm64Main by getting
val ios by creating {
dependsOn(commonMain)
iosX64Main.dependsOn(this)
iosArm64Main.dependsOn(this)
//iosSimulatorArm64Main.dependsOn(this)
dependencies {
implementation(SqlDelight.native)
}
}
}
}
android {
compileSdk = 31
sourceSets["main"].manifest.srcFile("src/androidMain/AndroidManifest.xml")
defaultConfig {
minSdk = 21
targetSdk = 31
versionCode = 1
versionName = "1.0"
}
}
sqldelight {
database("PetsDatabase") {
packageName = "com.example.kmp_app.db"
sourceFolders = listOf("sqldelight")
}
}
And my proyect build.gradle:
buildscript {
repositories {
google()
mavenCentral()
jcenter()
}
dependencies {
classpath("com.android.tools.build:gradle:4.2.0")
classpath(kotlin("gradle-plugin", version = Versions.kotlin))
classpath(kotlin("serialization", version = Versions.kotlin))
classpath("com.squareup.sqldelight:gradle-plugin:${Versions.sqldelight}")
}
}
allprojects {
repositories {
google()
mavenCentral()
jcenter()
}
}
plugins{
//kotlin("android") version "${Versions.kotlin}" apply false
}
I hope you can help and if like this, take thanks in advance !

I think it related with packageName in your Gradle:
packageName = "com.example.kmp_app.db"
Try to pass route of your cache function instead of "com.example.kmp_app.db"
like if my cache function exists on dataSource.cacheSource, we will pass "com.example.kmp_app.db.dataSource.cacheSource"
Be sure your Cache actual / expect function have the same package name like this "com.example.kmp_app.db.dataSource.cacheSource"
Shared gradle
sqldelight {
database("RecipeDatabase") {
packageName = "com.example.food1fork.Food1ForkKmm.DataSource.cacheSource"
sourceFolders = listOf("SqlDelight")
}
}
iOS module
package com.example.food1fork.Food1ForkKmm.DataSource.cacheSource
actual class DriverFactory {
actual fun createDriver(): SqlDriver {
return NativeSqliteDriver(RecipeDatabase.Schema, "recipes.db")
}
}
Android module
package com.example.food1fork.Food1ForkKmm.DataSource.cacheSource
actual class DriverFactory(private val context: Context) {
actual fun createDriver(): SqlDriver {
return AndroidSqliteDriver(RecipeDatabase.Schema, context, "recipes.db")
}
}
Shared module
package com.example.food1fork.Food1ForkKmm.DataSource.cacheSource
expect class DriverFactory {
fun createDriver(): SqlDriver
}

Why are some of these imports from the same library returning as unresolved references?

So I am currently trying to add a room database to an open-source project as part of my thesis, I grabbed the most recent example I could from android itself and modified it for Kotlin DSL, I used the same DAO and database structure but both have import errors. Normally this wouldn't be a problem to fix except I am getting errors from the same library in places which is why I had to ask this question in the first place. The main import problem is to do with androidx.room. Below is the kotlin file in question and after that, is the build.gradle.kts.
Just to add, android studio suggests I use persistence.room.runtime but from what I have tried and what I could find, this does not solve my problem either.
import androidx.room.Database //works
import androidx.room.Room // unresolved reference
import androidx.room.RoomDatabase // unresolved reference
#Database(entities = [GameDatabase::class], version = 1, exportSchema = false)
abstract class Database : RoomDatabase() {
abstract val DatabaseDAO: DatabaseDAO
companion object {
#Volatile
private var INSTANCE: Database? = null
fun getInstance(): Database {
synchronized(this) {
var instance = INSTANCE
if (instance == null) {
instance = Room.databaseBuilder(
Database::class.java,
"game_database"
)
.fallbackToDestructiveMigration()
.build()
INSTANCE = instance
}
return instance
}
}
}
}
Here is the module gradle build:
plugins {
//id("kotlin")
kotlin("kapt")
//kotlin("android")
//kotlin("android-extensions")
//id("kotlin-android")
//id("kotlin-android-extensions")
//id("androidx.navigation.safeargs")
}
java {
sourceCompatibility = JavaVersion.VERSION_1_6
}
tasks {
compileJava {
options.encoding = "UTF-8"
}
compileTestJava {
options.encoding = "UTF-8"
}
}
sourceSets {
main {
java.srcDir("src/")
}
}
// added
dependencies {
val room_version = "2.2.6"
val life_version = "2.2.0"
// Room and Lifecycle dependencies
implementation("androidx.room:room-runtime:$room_version")
kapt("androidx.room:room-compiler:$room_version")
//implementation("androidx.room:room-ktx:$room_version")
implementation("androidx.legacy:legacy-support-v4:1.0.0")
implementation("androidx.lifecycle:lifecycle-extensions:$life_version")
implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:$life_version")
implementation("androidx.lifecycle:lifecycle-livedata-ktx:$life_version")
implementation("androidx.lifecycle:lifecycle-common-java8:$life_version")
// adding Firebase dependencies
//implementation("android.arch.persistence.room:runtime:1.1.1")
//annotationProcessor("android.arch.persistence.room:compiler:2.2.6")
}
I am quite new to Kotlin DSL so it might be an obvious error but I also couldn't find anything like this in the area.

This is how I usually place the implementations:
//Room
implementation "androidx.room:room-runtime:2.2.6"
kapt "androidx.room:room-compiler:2.2.6"
// optional - Kotlin Extensions and Coroutines support for Room
implementation "androidx.room:room-ktx:2.2.6"
Also, have you placed the kapt plugin? if not:
plugins {
id 'kotlin-android'
id 'kotlin-kapt'//this one
}
And, try to clean and rebuild the project.

Using Android library in Kotlin multiplatform library

I have three targets commonMain/androidMain/iOSMain respectively. Because I need to access the assets in Android devices in androidMain module. I found I cannot use the Android API... The following is part of my build.gradle.kts:
import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget
plugins {
id("com.android.application")
kotlin("multiplatform")
}
repositories {
google()
jcenter()
}
android {
compileSdkVersion(29)
buildToolsVersion("29.0.1")
defaultConfig {
minSdkVersion(19)
targetSdkVersion(29)
}
sourceSets {
getByName("main") {
manifest.srcFile("src/androidMain/AndroidManifest.xml")
java.srcDirs(file("src/androidMain/kotlin"))
res.srcDirs(file("src/androidMain/res"))
}
}
}
kotlin {
//select iOS target platform depending on the Xcode environment variables
val iOSTarget: (String, KotlinNativeTarget.() -> Unit) -> KotlinNativeTarget =
if (System.getenv("SDK_NAME")?.startsWith("iphoneos") == true)
::iosArm64
else
::iosX64
iOSTarget("ios") {
binaries {
framework {
baseName = "Example"
}
}
}
jvm("android")
sourceSets["commonMain"].dependencies {
implementation("org.jetbrains.kotlin:kotlin-stdlib-common")
}
sourceSets["androidMain"].dependencies {
implementation("org.jetbrains.kotlin:kotlin-stdlib")
}
sourceSets["commonTest"].dependencies {
implementation ("org.jetbrains.kotlin:kotlin-test")
implementation ("org.jetbrains.kotlin:kotlin-test-junit")
}
}
How can I use Android library in androidMain? For example,
val inputStream = assets.open("Test.txt")

Make sure to create an AndroidManifest.xml with (library module) package name different than the (app module) package name underneath the SharedCode/src directory. And as Nagy Robi said use android() instead of jvm('android'). Please check the below references also:
Adding an Android Target to a Kotlin Multiplatform Project
Multiplatform sample

Try using android() instead of jvm('android') to load the target from the presets.