Explains how to use Android C2DM.

2. Independent Eclipse and Android Consultant and Trainer Team Lead and Android developer at SAP AG Maintains http://www.vogella.de Java, Eclipse and Android related Tutorials with ~30 000 visitors per day @vogella About me

3. Why is push good? Androids C2DM The server side

4. Data in the Cloud Mobile Phone The challenge

5. Internet creates value for your application

6. How to get data updates?

7. Getting the data Polling Pushing

8. Polling is easy to implement Data? No Data? No Data? NO Data? NOOOOO!!! Data? Yes

10. An average battery has approx. 820 – 1150 mAh power

12. Nobody likes apps which reduce the battery life of the phone

13. Nobody likes apps with stale data

14. Pushing Server informs the phone once new data is available

15. Androids C2DM

16. Why should a constant push connection consume less energy?

18. Cloud to Device Messaging Available for Android 2.2 (Beta – Invite only) Requires the Market available on the device Use existing Google connections Use AlarmManager to keep the connection (Heartbeat)

19. What components do you need?

20. Android App

21. Googles C2DM Server

22. Your application server

23. Trust - Everyone needs to know each other

24. Registration of the Server with Google Googles C2DM Server Your application server HTTP POST Token

25. Registration of the mobile device Googles C2DM Server Android App Request registration ID Unique registration ID Server might send new registration ID

26. Let my server know Android App Sends Registration ID to server Server stores the registration ID

27. Now my server is registered with Google AND has at least one device it can send message to

28. C2DM is ready to be used

29. Sending messages New HTTP Post message with registration id and authentication token * 200 – ok (with id==ok) 404 – get no auth token 503 – Retry with backoff

30. I hope Google treats my data confidential

31. Real Data is fetched from my server Sends notification message to device Reads the real data from server

32. Enforced by the message limit C2DM push can send 1024 bytes of data

33. Message Receiver Code...

34. Further points Best effort delivery: Google will try to deliver all messages but some might get lost collapse_key to ensure that old messages are overritten Message limit per sender, approx. 200 000

35. Server implementation can be anything curl, PHP, Python, C#, Scala,....

36. Android Developers like Java the Programming language

37. Your Java application server

38. from Guillaume Laforge and Patrick Chanezon http://www.slideshare.net/glaforge/google-app-engine-java-groovy-baby

39. Deployment of Java web application is....

40. Google App Engine Scalable Infrastructure GAE allows you to host webapplications on the Google infrastructure.

42. It automatically scales up and down Computing power over time

45. Building the app

49. Futher information C2DM Tutorial http://www.vogella.de/articles/AndroidCloudToDeviceMessaging/article.html Google App Engine Tutorial http://www.vogella.de/articles/GoogleAppEngineJava/article.html Chrome to Phone Example http://code.google.com/p/chrometophone/