Access Azure DevOps variables from Android Gradle

Question

While building my Android App inside DevOps Pipeline, I want to access the predefined Azure DevOps variables from inside my gradle script, which looks like this:

apply plugin: 'com.android.application'

// When running on the CI, this will return the build-number. Otherwise use 1
def buildNumber = System.getenv("Build.BuildNumber") as Integer ?: 1

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "my.app.id"
        minSdkVersion 23
        targetSdkVersion 29
        versionCode buildNumber
        versionName "1.0." + buildNumber
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    ...
}

On Bitrise, the call def buildNumber = System.getenv("BITRISE_BUILD_NUMBER") as Integer ?: 1 worked just fine, but I have no idea, how to access the Build.BuildNumber variable in Azure DevOps Pipeline.

Answer 1

Ok, I figured out how to access the variables. The trick is to replace the dot with an underscore and lowercase letters with uppercase letters.

So

def buildNumber = System.getenv("Build.BuildNumber") as Integer ?: 1

becomes

def buildNumber = System.getenv("BUILD_BUILDNUMBER") as Integer ?: 1

And given that Build.BuildNumber looks like 20191129.16, which is an invalid version code, I switched to

def buildNumber = System.getenv("BUILD_BUILDID") as Integer ?: 1