Windows Phone multitasking

1. APP-823T Windows Phone multitasking Peter Torr - http://blogs.msdn.com/ptorr Program Manager Microsoft Corporation

2. Key Takeaways for Windows Phone Mango Broad set of multitasking features Balances user experience with phone health Familiar .NET programming model

3. Windows Phone Multitasking Block Diagram Alarms & Reminders File Transfers Background Audio Periodic Execution Fast App Switching Built-in services 3rd-party services Resource Management

4. Windows Phone Harmony Delightful and Responsive UX Battery-Friendly Health Never Regret Installing Apps Network-Aware Integrated Experiences Hardened Services UX

5. Multitasking and Phone Health New OS services Processing on demand Balance foreground and background Align with system and user activity Monitor resource usage

6. demo Fast Application Switching

7. Fast Application Switching Support Keeps user in control Compile and test for Mango Suspends application threads Load or refresh state* OS Compatible with 7.0 apps Reattach resources* * Only if needed.

8. Application Lifecycle Reload / refresh state only if needed Activated Running Tombstoned Dormant Deactivated Application is resident in memory; system detaches resources and pauses threads Save state but do not discard it

9. demo + code Alarms and Reminders

10. Alarms and Reminders - Overview Same UX as built-in alarms and reminders Deep link back into the application Efficient implementation based on OS services

11. demo + code Background Transfer Service

12. Background Transfer Service - Limits 1 2 3 4 5

13. Background Transfer Service - Limits 20 MB 20 MB Unlimited 100 MB 5 MB

14. Background Transfer Service - Overview Balances functionality with phone health and user cost Simplifies download management in apps Efficient implementation based on OS services Persists across reboots

15. demo + code Live Tiles

16. Live Tiles - Overview Pin multiple tiles to Start New flip animation with additional content Update three ways: push, schedule, or local API

17. demo Background Agents

18. End-to-End Architecture Developer Application OS MyApp Solution MyApp.dll MyApp Project Single App UX WMAppManifest Logic System Services ISO Store Cloud MyAppAgent Project Logic Different Processes MyAppAgent.dll

19. code Background Agents

20. Background Agents – Basic Functionality Allowed Restricted • Tile updates • Toasts • Location • Networking • Storage • Most framework APIs • Microphone • Camera • Sensors • Graphics • Audio • All XNA libraries

21. Background Agents – Two Flavours Periodic Agent Resource-Intensive Agent • Runs every 30 minutes • Any network connection • Runs for 25 seconds • Used for location, data sync, etc. • Runs on external power • Non-cell network connection • Runs for 10 mins, recurring • Used for daily tasks, large data syncs, etc. ...when battery level is > 20% and battery saver is not on ...when battery level is > 90%

22. Background Agents - Overview Separate resource-constrained process Managed by the OS to maintain phone health User stays in control via system settings Familiar .NET programming model

23. demo Background Audio

24. End-to-End Architecture 20/30 West End Girls Pet Shop Boys MusicApp.dll UX Zune Playback Cloud ISO Store All playback logic lives in the agent! Logic MusicAgent.dll

25. code Background Audio

26. Background Audio Playback - Overview HTML 5 Audio Playback in Internet Explorer Track-based playback for standard formats Buffer-based playback for custom formats Guaranteed resources for continuous playback

27. Recap for Windows Phone Mango Broad set of multitasking features Balances user experience with phone health Familiar .NET programming model

28. Health UX

29. © 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. Microsoft makes no warranties, express, implied or statutory, as to the information in this presentation.

30. thank you Feedback and questions http://forums.dev.windows.com Session feedbackhttp://bldw.in/SessionFeedback

31. © 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.