android different applicationId & applicationIdSuffix by flavors chains

Question

I have 2 target android flavor, with 2 different customer flavor. I need:

1. first target with an appId and different suffix by customer
2. second target with a different appId without any suffix.

My tries:

flavorDimensions "customer","target"
productFlavors {
    customerA {
        dimension "customer"
        applicationId = "com.mycompany.newappname.customerA"
    }
    customerB {
        dimension "customer"
        applicationId = "com.mycompany.newappname.customerB"
    }
    targetA{
        dimension "target"
    }
    targetB{
        dimension "target"
        applicationId = "com.mycompany.oldappname"
    }
}

it doesn't work on targetB. I get appId defined in dimension customer, not the one in dimension target.

And I tried:

defaultConfig {
    applicationId "com.mycompany.newappname"
}
...
flavorDimensions "customer","target"
productFlavors {
    customerA {
        dimension "customer"
        applicationIdSuffix = ".customerA"
    }
    customerB {
        dimension "customer"
        applicationIdSuffix = ".customerB"
    }
    targetA{
        dimension "target"
    }
    targetB{
        dimension "target"
        applicationIdSuffix = ""
        applicationId = "com.mycompany.oldappname"
    }
}

but I get on resulting targetB appId= "com.mycompany.oldappname.customerB"

EDIT

I have specialized code in folders java/res of companyA/companyB needed both for targetA and targetB

Answer 1

Found the solution, developing on this answer and this other one

applicationVariants.all { variant ->
        variant.outputs.each { output ->
            if (variant.productFlavors[1].name.equals("targetb")) {
                variant.mergedFlavor.applicationId = "com.mycompany.oldappname"
            } else if (variant.productFlavors[0].name.equals("companya")) {
                variant.mergedFlavor.applicationId = "com.mycompany.newappname.companya"
            } else if (variant.productFlavors[0].name.equals("companyb")) {
                variant.mergedFlavor.applicationId = "com.mycompany.newappname.companyb"
            }
        }
}

Answer 2

It seems like customer dimension takes part for targetA only. Probably, you need targetB without any customer dimension. So I would try to add a new flavor for the default customer and variantFilter by target dimension.

    flavorDimensions "target", "customer"
    productFlavors {
        targetA {
            dimension "target"
            applicationId = "com.mycompany.newappname"
        }
        targetB {
            dimension "target"
            applicationId = "com.mycompany.oldappname"
        }
        customerUndefined {
            dimension "customer"
        }
        customerA {
            dimension "customer"
            applicationIdSuffix = ".customerA"
        }
        customerB {
            dimension "customer"
            applicationIdSuffix = ".customerB"
        }
    }


    variantFilter { variant ->
        def names = variant.flavors*.name
        switch (variant) {
            case { names.contains("targetA") and names.contains("customerUndefined") }:
                setIgnore(true)
                break
            case { names.contains("targetB") and names.contains("customerA") }:
                setIgnore(true)
                break
            case { names.contains("targetB") and names.contains("customerB") }:
                setIgnore(true)
                break
            default:
                break
        }
    }