Android Build with Kotlin DSL - 如何访问风味额外属性？

Question

Traditionally, in Groovy, it was possible to define flavor-specific variables in the ext {} block, but switching to Kotlin DSL it seems that the extra map has the project scope.

It looks like it is possible to force a flavor scope for extras by using:

productFlavors {
        register("flavor1") {
            require(this is ExtensionAware)
            ...
        }

        register("flavor2") {
            require(this is ExtensionAware)
            ...
        }
}

(source: https://github.com/gradle/kotlin-dsl-samples/issues/1254 )

But if it needs to be used later, for example to tweak the variables based on buildType like this:

variants.forEach { variant ->
  val flavor = variant.productFlavors[0]
  val size = ?? // extra??
  variant.buildConfigField("String", "SIZE", size)
}

how would these flavor-scoped references to extra be used?

Answer 1

Currently, only one working method to access ext properties on ProductFlavor is this way

    variant.productFlavors.forEach { flavor ->
        require(flavor is ReadOnlyProductFlavor)
        val properties = (flavor.getProperty("ext") as DefaultExtraPropertiesExtension).properties
    }

Or maybe more clear

    val flavor = variant.productFlavors[0] as ReadOnlyProductFlavor
    val extra = flavor.getProperty("ext") as DefaultExtraPropertiesExtension
    extra.get("myPropertyName")

It just does the same thing what Groovy does when you call the non-existing property ext

I created a feature request for making it easier https://issuetracker.google.com/issues/161115878