Variant-aware configuration for replacing strings in manifest (as placeholders) and resources

build.gradle

android.applicationVariants.all { variant ->
    String propsName = "../local/${variant.baseName}.properties"
    Properties props = new Properties()
    props.load(new FileInputStream(file(propsName)))

    println "Building \"${variant.baseName}\" tag..."

    props.stringPropertyNames().forEach {
        variant.resValue("string", it, props[it])
    }

    props = new Properties()
    String manifestName = "../local/manifest-${variant.baseName}.properties"
    props.load(new FileInputStream(file(manifestName)))
    def manifest = [:]
    props.stringPropertyNames().forEach { manifest[it] = props[it] }
    variant.mergedFlavor.manifestPlaceholders = manifest

    println "Properties generated!"
}