Script para incrementar versão Android

version.gradle

def readVersion() {
    def versionFile = new File(project.rootDir, 'version.properties')
    def version = new Properties()
    def stream
    try {
        stream = new FileInputStream(versionFile)
        version.load(stream)
    } catch (FileNotFoundException ignore) {
        //
    } finally {
        if (stream != null) {
            stream.close()
        }
    }

    if (!version['major']) version['major'] = "0"
    if (!version['minor']) version['minor'] = "0"
    if (!version['build']) version['build'] = "1"
    return version
}

def readVersionName() {
    def version = readVersion()
    return "1.${version['major']}.${version['minor']}"
}

def readBuildCode() {
    def version = readVersion()
    def build = version['build'] as Integer
    return build
}

def incrementBuildNumber(def currentBuild = -1) {
    def versionFile = new File(project.rootDir, 'version.properties')
    def version = readVersion()

    def build = version['build'] as Integer
    if(currentBuild>0){
        build = currentBuild
    }
    build++
    version['build'] = build.toString()

    def stream = new FileOutputStream(versionFile)
    try {
        version.store(stream, null)
    } finally {
        stream.close()
    }
    println "Build number is now... " + build
    return build
}

def incrementVersionNumber(def type = "minor") {
    def versionFile = new File(project.rootDir, 'version.properties')
    def version = readVersion()

    def major = version['major'] as Integer
    def minor = version['minor'] as Integer

    if (type == 'major') {
        major++
        minor = 0
    } else if (type == 'minor') {
        minor++
    }

    version['major'] = major.toString()
    version['minor'] = minor.toString()

    def stream = new FileOutputStream(versionFile)
    try {
        version.store(stream, null)
    } finally {
        stream.close()
    }
    println "Version is now... " + major + "." + minor
    return major + "." + minor
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

task doMajorVersionIncrement() {
    println "Incrementing major version..."
    incrementVersionNumber('major')
}

task doMinorVersionIncrement() {
    println "Incrementing minor version..."
    incrementVersionNumber('minor')
}

task doBuildNumberIncrement() {
    println "Incrementing build number ${findProperty("build") as Integer}..."
    incrementBuildNumber(findProperty("build") as Integer)
}