关键在于，这款应用在使用时不会在屏幕上显示出图标，这意味着智能手机的持有者甚至可能永远不会发现它已经被安装在手机里了。
Critically, the application did not show an icon on the screen when it was being utilised, meaning that the owner of the smartphone might not even realise that it had been installed.
自然，别人也要在手机上安装“条形码扫描器”(或者其他类似的条形码扫描应用程序)。
Naturally, they will have to have barcode Scanner (or another similar barcode scanning app) installed on their phone.
在Android手机上实现google+的服务，首先，你需要在手机上安装一个google+的应用； 然后通过网页登录google+并且设置一个同手机应用的链接；
To get Google+ Android app working you must first install the app, then log into Google+ via the Web to set up a link to your phone.
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