Android C2DM Presentation at O'Reilly AndroidOpen Conference
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This document discusses push notifications on Android using Google Cloud to Device Messaging (C2DM). It explains that polling for updates consumes more battery life than push notifications, which allow a server to push new data to a device. The key components needed for C2DM are an Android app, Google's C2DM server, and an application server. It also discusses using Google App Engine to build the application server.
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Android C2DM Presentation at O'Reilly AndroidOpen Conference
- 1. Pushing bits from the cloud - Android and Push Notification (C2DM) Lars Vogel – vogella.de
- 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
- 11. Polling every 5 min can consume 10 % of your battery Polling every 5 min can consume 10 % of your battery
- 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?
- 17. So why should that consume less battery? Connection is much cheaper then sending data .... and Market is anyhow holding a connection Connection Data transfer
- 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
- 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
- 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.
- 41. Google App Engine No Server maintenance Super easy deployment
- 42. It automatically scales up and down Computing power over time
- 43. GAE Key points Free to get started, ideal for prototyping Price was recently increased Supports subset of JPA / JDO for persistence Lots of additional services
- 44. Caching Channel API (push to client, comet) URL Fetching Mail Instant Messaging (XMPP) Image Manipulation User Management Background Tasks Map (no Reduce) XMPP (Chat) Pull Tasks (new) API’s
- 45. Building the app
- 46. Help is available Google for „Android C2DM tutorial“ Latest Google Plugin for Eclipse has a new wizard http://code.google.com/eclipse/docs/appeng_android_install_setup.html
- 47. Summary C2DM powerful and relatively simple to use Google App Engine makes prototyping Lets hope C2DM leaves beta soon and have a reasonable price model….
- 48. Picture Credits Add the prefix http://www.sxc.hu/photo Elephant: http://www.sxc.hu/photo/103473 Mouse http://www.sxc.hu/photo/ 1097314 Liquid http://www.sxc.hu/photo/ 1109534 Happy jumping people /930008 Beta /853828 Despair /150108 Broken Glass 1046397 Old Computer http://www.sxc.hu/photo/1028528 Person with remote http://www.sxc.hu/photo/ 485640 Victory fingers 906072 Guy with a tie 877661
- 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/
- 50. For further questions: [email_address] http://www.vogella.de http://www.twitter.com/vogella Thank you