android - Multiple signingConfigs for multiple variants

Question

How can I set different signing configs for different variants?

For instance, we currently have the buildtypes Debug/Beta/Release with 2 flavors, free and paid, resulting in 6 variants. To make it a bit easier, let's forget the Debug variants and only focus on freeBeta/paidBeta/freeRelease/paidRelease.

What I'd like, is for each variant to use a separate different signingConfig.

So far the only solutions I could find is either putting the signingConfigs in the buildTypes so all Beta variants would have the same signingConfigs:

buildTypes {
    beta {
        signingConfigs.beta
    }
    release {
        signingConfigs.release
    }
}

Alternatively, using the flavors, in which case all free variants would have the same signingConfigs:

productFlavors {
    free {
        signingConfig signingConfigs.free
        applicationId 'com.example.free'
    }
    paid {
        signingConfig signingConfigs.paid
        applicationId 'com.example.paid'
    }
}

Is there a way to do this in the current productFlavor closure? Can this only be fixed by overridding the android.applicationVariants.all { variant -> and manually applying a signingConfig for each application variant based on some naming scheme or some other ugly hack?

I also found this answer, but it doesn't appear to work in the latest build tools; when compiling I get the following error:

FAILURE: Build failed with an exception.

• Where: Build file '/home/dev/projects/app/build.gradle' line: 61

• What went wrong: A problem occurred evaluating project ':app'.

  Could not find property 'free' on ProductFlavor container.

Answer 1

The https://stackoverflow.com/a/32810290/3961802 answer will not work.

    beta {
        productFlavors.free.signingConfig signingConfigs.freeBeta
        productFlavors.paid.signingConfig signingConfigs.paidBeta
    }
    release {
        productFlavors.free.signingConfig signingConfigs.freeRelease
        productFlavors.paid.signingConfig signingConfigs.paidRelease                
    }

In this case, the release build type will overwrite all flavors. So signing config for the freeBeta will be freeRelease.

At the moment, the only solution that I know is to sign all the build variants in a separate task.

signingConfigs {

    bananaDebug {}
    bananaBeta {}
    bananaRelease {}

    orangeDebug {}
    orangeBeta {}
    orangeRelease {}

    lemonDebug {}
    lemonBeta {}
    lemonRelease {}
}

productFlavors {

    banana {}

    orange {}

    lemon {}
}

buildTypes {

    debug {}

    beta {}

    release {}
}

applicationVariants.all {
    def flavorName = it.getFlavorName()
    def buildTypeName = it.buildType.name
    def buildVariantName = flavorName + buildTypeName.capitalize()
    def currentSigningConfig = signingConfigs.getByName(buildVariantName)

    it.mergedFlavor.signingConfig = currentSigningConfig
    // If you want to sign debug build
    buildTypes.debug.signingConfig currentSigningConfig
}