How to set different applicationId for each flavor combination using flavorDimensions when using Gradle Kotlin-DSL?

I am converting an Android app to the Gradle Kotlin-DSL by using Kotlinscript files.

I have a problem converting our applicationId logic. We don't use the defaultConfiguration with applicationId plus various applicationIdSuffix for our flavors but a custom logic. The logic is described in this SO answer, here is the groovy code:

flavorDimensions "price", "dataset"

productFlavors {
    free { dimension "price" }
    paid { dimension "price" }
    dataset1 { dimension "dataset" }
    dataset2 { dimension "dataset" }
}

android.applicationVariants.all { variant ->
    def mergedFlavor = variant.mergedFlavor
    switch (variant.flavorName) {
        case "freeDataset1":
            mergedFlavor.setApplicationId("com.beansys.freeappdataset1")
            break
        case "freeDataset2":
            mergedFlavor.setApplicationId("com.beansys.freedataset2")
            break
        case "paidDataset1":
            mergedFlavor.setApplicationId("com.beansys.dataset1paid")  
            break
        case "paidDataset2":
            mergedFlavor.setApplicationId("com.beansys.mypaiddataset2")
            break
    }
}

With kotlin I cannot alter the applicationId of the mergedFlavor like in groovy. It is a val and therefore can't be changed.

Any elegant solution to solve this?

Solution

Google added the variants API with the Android Gradle Plugin 7.0.0. With it we can alter the applicationId.

android {
    flavorDimensions.addAll(listOf("price", "dataset"))

    productFlavors {
        create("free") { dimension = "price" }
        create("pro") { dimension = "price" }
        create("dataset1") { dimension = "dataset" }
        create("dataset2") { dimension = "dataset" }
    }
}

androidComponents {
    onVariants { variant ->
        val applicationId = when(variant.flavorName) {
            "freeDataset1" -> "com.beansys.freeappdataset1"
            "freeDataset2" -> "com.beansys.freedataset2"
            "proDataset1" -> "com.beansys.dataset1paid"
            "proDataset2" -> "com.beansys.mypaiddataset2"
            else -> throw(IllegalStateException("Whats your flavor? ${variant.flavorName}!"))
        }
        variant.applicationId.set(applicationId)
    }
}

Note that it is probably better to use a task to determine the applicationId.

For more informations see the following resources: