Error while adding Kotlin Multiplatform module as dependency: "Android project without build variants, and cannot be built."

Question

I am trying to add a Kotlin-Multiplatform library as a dependency to Android Project. I am getting the following error:

ERROR: The module 'my-core' is an Android project without build variants, and cannot be built. Please fix the module's configuration in the build.gradle file and sync the project again.

The build.gradle for 'my-core' Kotlin-Multiplatform library is as follows:

buildscript {
    repositories {
        google()
    }
    dependencies {
        classpath 'com.squareup.sqldelight:gradle-plugin:1.3.0'
        classpath 'com.android.tools.build:gradle:3.6.3'
    }
}

plugins {
    id 'org.jetbrains.kotlin.multiplatform' version '1.3.72'
    id 'org.jetbrains.kotlin.plugin.serialization' version '1.3.72'
}
repositories {
    mavenCentral()
    jcenter()
    google()
}

def ktor_version = '1.3.2'
def sqldeligh_version = '1.3.0'

group 'com.zoho.im.core'
version '0.0.1'

apply plugin: 'com.squareup.sqldelight'
apply plugin: 'maven-publish'
apply plugin: 'com.android.library'

android {
    compileSdkVersion(29)
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 29
        versionCode = 1
        versionName = "0.0.1"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

        //This is for MultiplatformSettings
        debug {
            // MPP libraries don't currently get this resolution automatically
            matchingFallbacks = ['release']
        }
    }
}

kotlin {
    android()
    // This is for iPhone simulator
    // Switch here to iosArm64 (or iosArm32) to build library for iPhone device
    iosX64("ios") {
        binaries {
            framework()
        }
    }
    sourceSets {
        commonMain {
            dependencies {
                implementation kotlin('stdlib-common')
                implementation "io.ktor:ktor-client-core:$ktor_version"
                implementation "io.ktor:ktor-client-serialization-native:$ktor_version"
            }
        }
        commonTest {
            dependencies {
                implementation kotlin('test-common')
                implementation kotlin('test-annotations-common')
            }
        }
        androidMain {
            dependencies {
                implementation kotlin('stdlib')
                implementation "io.ktor:ktor-client-okhttp:$ktor_version"
                implementation "io.ktor:ktor-client-serialization-jvm:$ktor_version"
                implementation "com.squareup.sqldelight:android-driver:$sqldeligh_version"
            }
        }
        iosMain {
            dependencies {
                implementation "io.ktor:ktor-client-ios:$ktor_version"
                implementation "io.ktor:ktor-client-serialization-native:$ktor_version"
                implementation "com.squareup.sqldelight:native-driver:$sqldeligh_version"
            }
        }
    }
}

sqldelight {
    IMDatabase {
        packageName = "com.harley.core"
    }
}

configurations {
    compileClasspath
}

The android project that I imported into is just a simple fresh project. Please advice

Thanks @KurtAcosta. What you've pointed is the issue. As I've pointed in my answer, those changes fixed the issue. But there are still some issues. Please check that stackoverflow.com/a/62038809/10506244 — Alex
– Alex, Commented May 27, 2020 at 8:38

Dico · Accepted Answer · 2020-05-27 07:33:34Z

2

It might be because you have a native dependency in commonMain sourceset: io.ktor:ktor-client-serialization-native:$ktor_version The metadata system wouldn't be able to find an appropriate target for this dependency, which might lead to the error you demonstrate. This is just me speculating.

answered May 27, 2020 at 7:33

Dico

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Alex · Accepted Answer · 2020-05-27 08:36:10Z

1

Replacing, io.ktor:ktor-client-serialization-native:$ktor_version with io.ktor:ktor-client-serialization:$ktor_version fixed the issue and the aar file is generated.

Side Note: this .aar file didn't pack androidMain dependencies. I had to manually add those dependencies(io.ktor:ktor-client-okhttp:$ktor_version, io.ktor:ktor-client-serialization-jvm:$ktor_version, com.squareup.sqldelight:android-driver:$sqldeligh_version) to consuming android project.

answered May 27, 2020 at 8:36

Alex

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