I am trying to follow this tutorial for Android application works on iOS using Kotlin Multiplatform.
Basically my goal is to reuse the business logic Kotlin code in existing Android code so our team can experiment on new iPhone user base.
However after I tried the step for adding new Kotlin Multiplatform Shared Module. It cannot compile.
The error is
Unresolved reference: libs
I tried comparing with the source code they provided.
https://github.com/Kotlin/kmm-integration-sample/tree/final
It seems that the Android Studio version and/or the Gradle version of the sample code is outdated.
My code of shared/build.gradle.kts is below
plugins {
alias(libs.plugins.kotlinMultiplatform)
alias(libs.plugins.androidLibrary)
}
kotlin {
androidTarget {
compilations.all {
kotlinOptions {
jvmTarget = "1.8"
}
}
}
listOf(
iosX64(),
iosArm64(),
iosSimulatorArm64()
).forEach {
it.binaries.framework {
baseName = "shared"
isStatic = true
}
}
sourceSets {
commonMain.dependencies {
//put your multiplatform dependencies here
}
commonTest.dependencies {
implementation(libs.kotlin.test)
}
}
}
android {
namespace = "net.petrabarus.poc.android.shared"
compileSdk = 34
defaultConfig {
minSdk = 24
}
compileOptions {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
}
while the code of shared/build.gradle.kts in the sample code is below.
plugins {
kotlin("multiplatform")
id("com.android.library")
}
kotlin {
android()
listOf(
iosX64(),
iosArm64(),
iosSimulatorArm64()
).forEach {
it.binaries.framework {
baseName = "shared"
}
}
sourceSets {
val commonMain by getting
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 = 31
sourceSets["main"].manifest.srcFile("src/androidMain/AndroidManifest.xml")
defaultConfig {
minSdk = 21
targetSdk = 31
}
}
It seems that the newest one uses the shared dependency configuration from Gradle.
https://docs.gradle.org/current/userguide/platforms.html
I added this libs.versions.toml below from the KMM Project Wizard
[versions]
agp = "8.2.0"
kotlin = "1.9.22"
[plugins]
androidLibrary = { id = "com.android.library", version.ref = "agp" }
kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
The error is now like below
Error resolving plugin [id: 'org.jetbrains.kotlin.multiplatform', version: '1.9.22']
> The request for this plugin could not be satisfied because the plugin is already on the classpath with an unknown version, so compatibility cannot be checked.
This is the code
https://github.com/petrabarus/poc-android-export-kmm-module-to-maven/tree/add-shared
What did I do wrong, and how do I fix this?
The Android Studio I am using is below
Android Studio Hedgehog | 2023.1.1
Build #AI-231.9392.1.2311.11076708, built on November 9, 2023
Runtime version: 17.0.7+0-17.0.7b1000.6-10550314 aarch64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 14.2.1
GC: G1 Young Generation, G1 Old Generation
Memory: 1024M
Cores: 8
Metal Rendering is ON
Registry:
external.system.auto.import.disabled=true
ide.text.editor.with.preview.show.floating.toolbar=false
Non-Bundled Plugins:
com.jetbrains.kmm (0.8.2(231)-25)
org.jetbrains.compose.desktop.ide (1.6.0)
I tried to match the dependencies and version of the libraries from the shared/build.gradle.kts, root build.gradle.kts and libs.versions.toml
// gradle/libs.versions.toml
[versions]
agp = "8.2.0"
kotlin = "1.9.0"
[plugins]
androidLibrary = { id = "com.android.library", version.ref = "agp" }
kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
//build.gradle.kts
// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
id("com.android.library") version "8.2.0" apply false
id("com.android.application") version "8.2.0" apply false
id("org.jetbrains.kotlin.android") version "1.9.0" apply false
id("org.jetbrains.kotlin.multiplatform") version "1.9.0" apply false
}
Now the error change to
Build was configured to prefer settings repositories over project repositories but repository 'ivy' was added by build file 'shared/build.gradle.kts'
The problem is in these lines
listOf(
iosX64(),
iosArm64(),
iosSimulatorArm64()
).forEach {
it.binaries.framework {
baseName = "shared"
isStatic = true
}
}
Finally I tried matching the settings.gradle.kts with the KMM Project Wizard.
Previous is
pluginManagement {
repositories {
google()
mavenCentral()
gradlePluginPortal()
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
}
}
Now is
pluginManagement {
repositories {
maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
google()
mavenCentral()
gradlePluginPortal()
}
}
dependencyResolutionManagement {
//repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
}
}
The build runs! I am not sure why, but it runs!