Hi there! I have issues with my KMM module. I wrot...

# multiplatform

[Adi Pilav]

Hi there! I have issues with my KMM module. I wrote an expect class in commonMain and actual implementations in androidMain , jvmMain and iosMain . However, Android Studio requires me to add additional actual implementation in main source set, which shouldn't even exist, per my understanding at least. When I tried to use this module as a project dependency in another feature module, the feature module was actually using the implementation from the main source set instead of androidMain. I am using Kotlin 1.7.10 and Android Studio Electric Eel | 2022.1.1 Patch 2. Am I doing something wrong here? I'll post build.gradle configuration in the reply.

[Adi Pilav]

plugins {
    id 'org.jetbrains.kotlin.multiplatform'
    id 'org.jetbrains.kotlin.plugin.serialization'
    id 'com.android.library'
}

apply from: "../dependencies.gradle"

kotlin {
    jvm()
    android()
    ios()
    iosSimulatorArm64()

    sourceSets {
        commonMain.dependencies {
            ...
        }

        androidMain {
            dependsOn(commonMain)
        }

        iosMain {
            dependsOn(commonMain)
        }

        iosSimulatorArm64Main {
            dependsOn(iosMain)
        }

        jvmMain {
            dependsOn(commonMain)
        }

        jvmTest.dependencies {
            ...
        }
    }
}

android {
    compileSdk 33
    sourceSets.named("main") {
        manifest.srcFile("src/androidMain/AndroidManifest.xml")
    }
    defaultConfig {
        minSdk 24
        targetSdk 33
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_11
        targetCompatibility = JavaVersion.VERSION_11
    }
}

[Jeff Lockhart]

Is there a reason you're not using a newer version of Kotlin? There have been a lot of fixes and improvements in KMP since 1.7.10.

[Adi Pilav]

Yeah, you are right. I will try to update the Kotlin and see if that helps, I just hope it doesn't require a newer Java version as I have to use Java 11. Thank you @Jeff Lockhart for the feedback, I appreciate your input!

[Jeff Lockhart]

You won't need to update Java. Kotlin supports a minimum of Java 8 since 1.5.