build.gradle

def tag = 'git describe --tags --always --abbrev=0'.execute().getText().trim()
def (versionMajor, versionMinor, versionPatch) = tag.tokenize('.')
def buildNumber = System.getenv("BUILD_NUMBER") as Integer ?: 1
def VERSION_NAME = "$versionMajor.$versionMinor.$versionPatch.$buildNumber"
def VERSION_CODE = versionMajor.toInteger() * 1000 + versionMinor.toInteger() * 100 + versionPatch.toInteger() * 10 + buildNumber.toInteger()

 defaultConfig {
        applicationId ""
        minSdkVersion 19
        targetSdkVersion 28
        versionCode VERSION_CODE
        versionName VERSION_NAME
}