Tutorial: Implement Android Push Notifications in your Couchbase Mobile app

Using push and pull replication in continuous mode can be helpful when developing an application, but it can also have an impact on battery life. An alternative to continuous pull replication is using Google Cloud Messaging (GCM) to send push notifications to Android devices. To implement GCM syncing in an application, a new Google API project must be created and the device token retrieved from GCM. A wakeful service kicks off the GcmMessageHandler class, which performs a one-shot pull replication of data from Sync Gateway when a notification is received. The user profile document stores the device tokens, and changes to the database are monitored through the Sync Gateway Changes Feed endpoint, which returns a sorted list of changes made to documents in the database. When a change is detected, the GcmMessageHandler class sends a request to Google Cloud Messaging servers with the API Key and notification payload.

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