How to auto-increment cocos2d-x android build number

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from: http://stackoverflow.com/questions/21405457/autoincrement-versioncode-with-gradle-extra-properties

To auto-increment the build number of an android app, following gradle code can be used: proj.android-studio/app/build.gradle

apply plugin: 'com.android.application'

android {
  compileSdkVersion 22
  buildToolVersion "22.0.1"

// get version/build numbers
  def versionPropsFile= file('version.properties')
  if (versionPropsFile.canRead()) {
    def Properties versionProps= new Properties()
    versionProps.load(new FileInputStream(versionPropsFile))
    def version = versionProps['VERSION']
    def build= versionProps['BUILD'].toInteger() + 1
    versionProps['BUILD']= code.toString()
    versionProps.store(versionPropsFile.newWriter(), null)

    defaultConfig {
      applicationId "kr.jachong.newgame"
      minSdkVersion 10
      targetSdkVersion 22
// apply version/build numbers
      versionCode build
      versionName version
      ....
    }
  } else {
    throw new GradleException("Could not read version.properties")
  }
  ...
}

To enable above script, proj.android-studio/app/version.properties file should be prepared.

VERSION 1.0
BUILD 1