Google Cloud Messaging，如何控制邮件队列？

Question

I have implemented Google Cloud Messaging on Android. When the device is no internet connection and receives messages accumulate in queue and when he returns to have internet connection receives all. This is a problem for me. I want that when the device has more than one message queue receives only one. This is possible?

Is there any way to see the queue on the server?

Thank you

Update...

Work fine...

$fields = array(
            'registration_ids' => $registrationIDs,
            'data' => array("message" => $message),
            'collapse_key' => $collapse_key,
        );

Answer 1

You do that with collapse_key .

It all the messages have the same collapge_key , only the last message will be stored in GCM server and delivered to the device when it's back online.

collapse_key

An arbitrary string (such as "Updates Available") that is used to collapse a group of like messages when the device is offline, so that only the last message gets sent to the client. This is intended to avoid sending too many messages to the phone when it comes back online. Note that since there is no guarantee of the order in which messages get sent, the "last" message may not actually be the last message sent by the application server. Collapse keys are also called send-to-sync messages.

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