2. Windows Phone Platform Integration Yochay Kiriaty Microsoft @yochayk

4. Agenda Love and hate tombstoning
What is tombstone and why you should care?
The basic
Advance
Choosers and Launchers and Tombstone
What, why, and how
Tombstoning

5. Basic Application Lifecycle
Not running
Launching
Running
Closing

6. Tombstoned (in most cases)
Tombstone Application lifecycle
Press Start
Open toast
Lock screen
Running
Deactivated
Tombstoned (in most cases)
Activated
User is back where he` left off
Load state to continue where she left off
Save state for later use
The application’s process is killed (in most cases)*

7. App Management
The Windows Phone execution model is designed to provide end users with a fast, responsive experience
Only one 3rd-party application can run in the foreground
System terminates your application when user navigates away
App is Tombstoned when user “navigates” away
System saves some state information then terminates the app
When user navigates back to the application, system restarts it and passes state information back to the client
Developer must write code to respond to lifecycle events
Save and restore state
Maintain illusion that the application is running continuously

8. Lifecycle Events Application_Launching Application_Activated
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Lifecycle Events
Application_Launching
When the application is launching
Not fired when the application is reactivated
Application_Activated
When the application is activated
Not fired when the application is first launched
Application_Deactivated
When the application is deactivated
Not fired when the application is closing
Application_Closing
When the application is closing
Not fired when the application is deactivated
© 2010 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.

9. Application Lifecycle 1
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Application Lifecycle 1
User ‘Backs’ past first page
App Running
Launching event
Closing event
Start
User invokes chooser or launcher, or presses Start to launch another app
Deactivated event
© 2010 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.

10. Application Lifecycle 2
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Application Lifecycle 2
User completes chooser or launcher. Or user navigates back from other app to reach your app
Restored app instance
App Running
Deactivated event
Activated event
New app instance
User presses Start and launches your application
App Running
Launching event
© 2010 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.

11. Demo Application Lifecycle Demo #1 Launch app - Run normal
Show logger, events and such,
Show code App.xaml
Page1 and Page 2
Exit the app and launch again…
Show logger
Demo #2
Launch app
Nav to page 2
Tombstone
Launch the app
Show log as new app
Demo #3
Press back button
Show log and show tombstone
Notice constructor of app and page 2
Press back to return to page 1
Show log, explain
You cant take dependency about page creation and or object creation

12. Tombstone and Controls
Pivot
Use SelectedIndex
Must used in the page (control) loaded event
Pano
DefaultItem
But….
Scrollbar
VerticalOffset
Map Control
Zoom levels and other transforms
Picture viewer or any other control
manipulation.

13. Demo Tombstone & Controls Demo #1 – Pivot: Save the right pivot
Demo #2 – Pano
With Pano, you cant really do anything
Show code
pano.SelectedIndex is read only
Pano Default item changes
With Pano – recommendation is not to do anything unless you are willing to take the hit for the background
Demo #3 – Pivot save scrollbox location

14. Tombstone and Resources
Camera, Video, Mic
Release on Page OnNavigatingFrom (or earlier)
Location
Deactivated (ideal on OnNavigatingFrom)
Remember warm-up time
Sensors
Stop on Page OnNavigatingFrom

15. Application’s load time
Advance Topics
Application’s load time
Lunching , Existing, Deceived, Activated: all in just 10 sec
Defer loading and use background thread
Serlilization frameworks and times
Make sure you read this
Optimize save state
Per page
Global (MVVM)

16. Launchers and Chooser Common tasks used by users
Camera, SMS, Contacts, Marketplace, etc…
Tombstone the application
Some have relaxed tombstoning policy
PhotoChooserTask
CameraCaptureTask
MediaPlayerLauncher
AddressChooserTask
PhoneNumberChooserTask
Game Invite – Used in XNA Games
Gamer Card – Used in XNA Games

17. Demo Launchers, Choosers And Tombstone
Demo #1 – show app lifecycle demo
select phone number – doesn’t tombstone, therefore load log differently
Send SMS - tombstones…

18. Summary
Tombstone is part of your Windows Phone application – deal with it!
Understand method call order
Do not rely on classes or page constructors
Check global objects before using
Defer work as much as possible
Be smart when saving your state
Be aware of startup and shutdown times
Delight your users by working smart with controls, UI, and resources

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