Generate APK with version names and date

apk_versioning.gradle

// This gist is tested with gradle version 2.1.2
// Create a method outside android { .... }
// Built apk file naming: AppName-VersionName-Date-BuildType.apk
def getBuildFileName(versionName) {
    def date = new Date().format('yyyy-MMM-dd')
    def appName

    if(project.hasProperty("applicationName")){
        appName = applicationName
    }else {
        appName = parent.name
    }

    return "${appName}-${versionName}-${date}"
}

android {
  ....
  ....
  defaultConfig {
        applicationId "<app_id>"
        minSdkVersion <min_sdk>
        targetSdkVersion <target_sdk>

        versionCode 71000
        // Major -> Millions, Minor -> Thousands, Bug fix -> Hundreds. E.g 1.3.72 == 1,003,072
        versionName "0.71.0"
        setProperty("archivesBaseName",getBuildFileName(versionName))
    }
    ...
    ...
  }