Use a local.properties field when declaring a buildConfigField

Question

I have a build.gradle and a local.properties file. I want to declare a value in local.properties, which isn't checked in to version control, to use in build.gradle.

I have the buildConfigField working with:

buildTypes {
    debug {
        buildConfigField "String", "TEST", "test"
    }
}

Unfortunately though, this causes an error:

buildTypes {
    debug {
        buildConfigField "String", "TEST", local.properties.get("test")
    }
}

Answer 1

It can be achieved like:

def getProps(String propName) {
  def propsFile = rootProject.file('local.properties')
  if (propsFile.exists()) {
    def props = new Properties()
    props.load(new FileInputStream(propsFile))
    return props[propName]
  } else {
    return "";
  }
}

in your buildTypes block:

buildTypes {
    debug {
        buildConfigField "String", "TEST", getProps("test")
    }
}