GCM (Google Cloud Messaging) is a free service that allows application servers to send lightweight messages to Android applications. It eliminates the need for continuous polling of a server for updates by allowing messages to be pushed to devices even when apps are not running. Developers must integrate the GCM client library into their Android apps, register their apps with the Google API console to obtain an API key, and handle incoming messages with a GCMIntentService. The GCM service replaces the deprecated C2DM service with easier setup and no quotas on messages.

2. Android, let’s chat!
Google Cloud Messaging
By
Maria Magdalena Bădiţa

8. I’m so lonely…

13. What is GCM?
Push: lightweight message to
GCM (Google Cloud Messaging) is
applications telling that there is
a free service that helps
new data to be fetched from the
developers send data from servers
server or a message containing
to their Android applications on
up to 4kb of payload data (e.g:
Android devices.
instant messaging apps).
This can eliminate continuous
query to server for updates
using background services

14. GCM Characteristics
Allows 3rd-party GCM makes no
application servers to send guarantees about delivery
messages to their Android or the order of messages.
applications.
Application on an Android device
doesn't need to be running to
receive messages.

15. Device registration

16. Send the notification

17. Google API Console
1.Creating a Google API project
2.Enabling the GCM Service http://developer.android.com/google/gcm/gs.html
3.Obtaining an API Key

18. Writing the Android Client I
Copy the gcm.jar file into your application classpath.

19. Writing the Android Client II
Write the my_app_package.GCMIntentService class
Write your application's main activity

20. Migration
Android Cloud to Device
Messaging (C2DM) is
deprecated. GCM replaces C2DM
The focus of GCM is as follows:
* Ease of use. No sign-up forms.
* No quotas.
* GCM and C2DM stats are available
through the Developer Console.
* Battery efficiency.
* Rich set of new APIs.

21. Client changes
Server changes
Sending messages to GCM devices requires a few changes:
* The request should be sent to a new endpoint:
https://android.googleapis.com/gcm/send.
* The Authorization header of the request should contain the
API key generated during sign up. This key replaces the
deprecated ClientLogin Auth token.

22. Resources
• http://developer.android.com/
• https://developers.google.com/events/io/

24. Thank you!!! Now I can
chat with my Android
friends! :)
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)
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