Snippet for adding current version value in android apk release file name

android-custom-apk-file-name.gradle

/**
 * Define 'APP_MODULE_NAME' and 'APK_NAME' vars in gradle.properties file.
 */
android {
    applicationVariants.all { variant ->
        variant.outputs.each { output ->
            def outputFile = output.outputFile
            if (outputFile != null && outputFile.name.endsWith('.apk')) {
                def fileName = outputFile.name.replace('.apk', "-${versionName}.apk")
                fileName = fileName.replace(APP_MODULE_NAME, APK_NAME)
                output.outputFile = new File(outputFile.parent, fileName)
            }
        }
    }
}