Custom active-flavor-specific gradle task included in build process

Question

Per an Android Gradle build environment:

I currently read my Version Code and Version Name from a local version.properties file via a "readVersions" gradle task. I am in the process of adding flavors to my app. These flavors would need different versions. So I was thinking of putting two different version.properties files inside of flavor specific directories (e.g. one/version.properties, two/version.properties) next to the flavor specific "res" and "src" directories.

I have a readVersions task:

task readVersions() {
    def Properties versionProps = new Properties()
    def versionPropsFile = file('version.properties')
    if (versionPropsFile.exists())
        versionProps.load(new FileInputStream(versionPropsFile))
    def v_code = (versionProps['VERSION_CODE'] ?: "0").toInteger()
    def v_name = versionProps['VERSION_NAME']

    // Set
    versionCode v_code
    versionName v_name
}

project.afterEvaluate {
    preBuild.dependsOn readVersions
}

I would like to have a new readVersions task that incorporates the flavor so that I can use it in accessing the "version.properties" file within the "flavor" directory.

I have tried:

android.productFlavors.all{ flavor ->
    task ("${flavor.name}_readVersions")<<{
    def versionPropsFile = file(flavor.name+'/version.properties')
...

But then I don't know how to get only the active flavor's task to run during the "preBuild" step.

Conceptually I want this:

project.afterEvaluate {
    preBuild.dependsOn ${active_flavor}_readVersions
}

To those who recommend reorganizing and finding simpler solutions. My build process currently has other dependencies on these version.properties files. I could just define the version code and version name in two places (e.g. inside the "flavor" as well as within a flavor's version.properties file, but I really want DRY configs)

Answer 1

I split my "readVersions" task into "readVersionName" and "readVersionCode"

def getVersionName(flavor) {
    return getVersion(flavor, "VERSION_NAME", false)
}
def getVersionCode(flavor) {
    return getVersion(flavor, "VERSION_CODE", true)
}
def getVersion(flavor, type, intRequired) {
    // READ
    def Properties versionProps = new Properties()
    def versionPropsFile = file("${flavor}/version.properties")
    if (versionPropsFile.exists())
        versionProps.load(new FileInputStream(versionPropsFile))
    def value = versionProps["${type}"]
    return intRequired ? value.toInteger() : value
}

Then I run them inside each flavor's definition:

productFlavors {
    one {
        versionName getVersionName("one")
        versionCode getVersionCode("one")
    }
    two {
        versionName getVersionName("two")
        versionCode getVersionCode("two")
    }

One thing to note, my previous attempt was trying to incorporate the versionName and versionCode setting into dependencies on the preBuild task. It seems like by this time in the process, 'versionName' can no longer be set properly. My tasks were not setting it from the correct flavor, which is why I came up with another solution, but reading it after setting it was always 'null'.

Thank you CommonsWare for the comments and suggestions.