How to use final resolved applicationId in build.gradle

Question

Say I have the following build.gradle

android{
    defaultConfig{
        applicationId "com.example.base"
    }
    buildTypes{
        release{
            minifyEnabled true
        }
        debug{
            applicationIdSuffix ".dev"
            minifyEnabled false
        }
    }
    productFlavors{
        free{
            applicationId "com.example.free"
        }
        paid{
            applicationId "com.example.paid"
        }
    }
}

I want to add the resulting application id to strings.xml, like this:

resValue "string", "app_package", applicationId

So I can then use this value in intents targetPackage defined in preferences xml

But the value changes depending on what block I put that line in:

• defaultConfig -> "com.example.base" (always the base Id, useless)
• productFlavours.free -> "com.example.free" (problem is this does not change to "com.example.free.dev" for debug builds)
• productFlavours -> Error, does not build
• buildTypes.debug -> Error, does not build

By using the applicationIdSuffix, I need gradle to resolve the final id before I can use it. How do I do that?

Answer 1

Add this after productFlavors within android DSL:

applicationVariants.all { variant ->
    variant.resValue  "string", "app_package", variant.applicationId
}

In freeDebug build this will be added in app/intermediates/res/merged/free/debug/values/values.xml:

<string name="app_package" translatable="false">com.example.free.dev</string>

In paidDebug:

<string name="app_package" translatable="false">com.example.paid.dev</string>