Automatically add Git revision information when building SNAPSHOT versions of an App

build.gradle

Integer VERSION_CODE = 16
String VERSION_NAME = getVersionName("0.4-SNAPSHOT")


def getVersionName(String preferredVersionName) {
    if (preferredVersionName.contains("-SNAPSHOT")) {
        return getGitStatus(preferredVersionName)
    } else {
        return preferredVersionName
    }
}

def getGitStatus(String versionName) {
    try {
        def stdout = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'describe'
            standardOutput = stdout
        }
        return versionName + '-' + stdout.toString().trim()
    }
    catch (ignored) {
        return versionName;
    }
}