对于任何Google服务，您都应在控制台上注册您的添加应用。

For any google service,you should register your add app at console.

如果您不想添加应用那么您可以将任何第三方API用于条形码。

If you don't want to add your app then you can use any third party API for barcode.

https ：//github.com/zxing/zxing