Gradle Auto Versioning Logic

auto_versioning.gradle

//auto versioning logic
def versionPropertiesFile = file('version.properties')
if (versionPropertiesFile.canRead()) {
    def Properties properties = new Properties()
    properties.load(new FileInputStream(versionPropertiesFile))
    def build = properties['BUILD'].toInteger() + 1
    properties['BUILD'] = build.toString()
    properties.store(versionPropertiesFile.newWriter(), null)

    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 18
        targetSdkVersion 21
        versionCode 1
        versionName "0.1.${build}"
    }
}

version.properties

MAJOR=0
MINOR=1
BUILD=422
PATCH=0