Android source set layout

The new layout requires Android Gradle plugin 7.0 or later and is supported in Android Studio 2022.3 and later. Check your version of the Android Gradle plugin and upgrade if necessary.

If applicable, rename the source sets in your project, following this pattern:

{AndroidSourceSet.name} maps to {KotlinSourceSet.name} as follows:

If applicable, move your source files to the new directories, following this pattern:

{AndroidSourceSet.name} maps to {SourceDirectories included} as follows:

If you have the AndroidManifest.xml file in your project, move it to the new directory, following this pattern:

{AndroidSourceSet.name} maps to {AndroidManifest.xml location} as follows:

The new Android source set layout changes the relationship between Android-instrumented tests (renamed to androidInstrumentedTest in the new layout) and common tests.

Previously, the dependsOn relationship between androidAndroidTest and commonTest was the default. It meant the following:

• The code in commonTest was available in androidAndroidTest.

• expect declarations in commonTest had to have corresponding actual implementations in androidAndroidTest.

• Tests declared in commonTest were also running as Android instrumented tests.

In the new Android source set layout, the dependsOn relationship is not added by default. If you prefer the previous behavior, manually declare the following relationship in your build.gradle.kts file:

kotlin {
// ...
    sourceSets {
        val commonTest by getting
        val androidInstrumentedTest by getting {
            dependsOn(commonTest)
        }
    }
}

Previously, the Kotlin Gradle plugin eagerly created source sets that corresponded to Android source sets containing debug and release build types or custom flavors like demo and full. It made the source sets accessible by using expressions like val androidDebug by getting { ... }.

The new Android source set layout makes use of Android's onVariants to create source sets. It makes such expressions invalid, leading to errors like org.gradle.api.UnknownDomainObjectException: KotlinSourceSet with name 'androidDebug' not found.

To work around that, use the new invokeWhenCreated() API in your build.gradle.kts file:

kotlin {
// ...
    @OptIn(ExperimentalKotlinGradlePluginApi::class)
    sourceSets.invokeWhenCreated("androidFreeDebug") {
// ...
    }
}