0

When I go to the Google Play on-line store and install an app, how does my phone know to install it? Is it using push notifications? Quite often it happens within a few seconds so presumably it can't be using polling.

I just don't understand the nature of the connection between my phone and Google's servers.

3

Yes, it's using a push notification via Google Cloud Messaging (GCM), the same as Google+ Hangouts, Google+, Gmail, and some third-party apps.

1

Google Play uses C2DM (Cloud to Device Messaging) to inform your device about the download. On your device, the Google Play Store app has registered a corresponding "receiver", so it knows this message was meant for it, and downloads the .apk – which then gets installed to your device.

And yes, your guess was right: C2DM is also often referred to with the term "push notification".

  • 2
    C2DM is deprecated, and replaced by Google Cloud Messaging, in the Google Play Services library. – Dan Hulme Jun 4 '14 at 16:43
  • @DanHulme Ah, didn't know that. As a non-dev, I always assumed the two being the same (even the corresponding app permissions are called c2dm.permission.SEND resp. c2dm.permission.RECEIVE). So thanks for the pointer! – Izzy Jun 4 '14 at 17:40

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.