1. Google Cloud Messaging In Android
Presented by –
Amardeep Vijay

2. C2DM
• Stands for Cloud to Device Messaging
• Used to send message from cloud to device or
application
• Support Push Notification
• C2DM retired and It’s time to GCM (Google
Cloud Messaging)
• Part of Google API

3. Poll And Push Notifications
• Poll :- Application contact cloud to check new
message
Disadvantage :-
• Extra Network Usages
• Reduced Battery life
Server/Cloud App / Device

4. Poll And Push Notifications (Cont…)
• Push :- Server contact Application or device whenever new
message is available
Advantages :-
• Reduce extra network uses
• Consumes less battery
Server/Cloud App / Device

5. How C2DM Works
App Server C2DM Server
App / Device

6. C2DM : Advantages & Disadvantages
Advantages :
• Using C2DM Developers can develop more
productive apps
• C2DM is connected to cloud so developers can
get benefits of cloud computing in their apps
Disadvantage :
• Internet connectivity is required
• Limited message size

7. Google cloud messaging

8. Why GCM ?
• Google migrated its products like :
Blogger to Google Blogs
Picasa to Google Image
AdMob to Google AdMob
Android marketplace to Google play
• So It’s time to C2DM to GCM
• Overcome disadvantages of C2DM

9. GCM
• Stands for Google Cloud Messaging
• Used for sending message from Cloud to
Device
• Introduce With Android 4.1 Jelly Bean as a
part of Google API 16
• Supports Push Notifications

10. How GCM Works
App Server GCM Server
App / Device

11. GCM (Cont…)
• GCM is two way Process –
1. Either GCM server registration or
2. No GCM server registration required : only
use GCM specific API or simply Google API 16
Application Signing(Generate Application
specific fingerprint)

12. Advantage of GCM
Advantages :
• Using GCM Developers can develop more
productive apps
• GCM is connected to cloud so developers can
get benefits of cloud computing in their apps
• GCM is now connected with GAE(Google App
Engine)

13. Working Example of GCM
Google Play :
• Google play uses GCM to install requested
android apps from Google play official site.
(http://play.google.com)
• Google play android app uses GCM to receive
requested apps from google play

14. Summary
• Message Multicasting for News
• Multiple Senders for Social Updates
• Time to Live for Events and Promos
• Messages with Payload for IM

16. Thank you for your time.