Android Gradle APK name

gradle_apk_name

buildTypes {
    release {
    //...
applicationVariants.all { variant ->
        variant.outputs.each { output ->
            output.outputFile = new File(
                    output.outputFile.parent,
                    output.outputFile.name.replace("app-release.apk", "YOURAPPNAME-${variant.versionName}.apk"))
        }
    }
    }
    }