ONLINE CONFERENCE

DESIGN.BUILD.DELIVERwith WINDOWS PHONE

THURSDAY 24 MARCH 2011

Yochay KiriatyMicrosoft

@yochayk

http://windowsteamblog.com/

yochayk@microsoft.com

Windows Phone Platform Integration

http://learningwindowsphone.com

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

Not running

Launching

Running

Closing

Basic Application Lifecycle

Tombstone Application lifecycle

Running

Deactivated

Tombstoned (in most cases)

Activated

The application’s process is killed (in most cases)*

Save state for later use

Load state to continue where she left off

User is back where he` left off

Press Start Open toast Lock screen

7

• 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

App Management

8

• 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

Lifecycle Events

9

Application Lifecycle 1

Start

Launching event

App Running

User ‘Backs’ past

first pageClosing event

User invokes chooser or

launcher, or presses Start to launch another

app

Deactivated event

Application Lifecycle 2

10

Restored app instance

App Running

User presses Start and launches your

application

User completes chooser or

launcher. Or user navigates back

from other app to reach your app

Deactivated event

Activated event

New app instance

Launching event

App Running

Application Lifecycle

Demo

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.

Tombstone & Controls

Demo

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

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)

Launchers and Chooser

• Common tasks used by users– Camera, SMS, Contacts, Marketplace, etc…

• Tombstone the application– Some have relaxed tombstoning policy

• PhotoChooserTask• CameraCaptureTask• MediaPlayerLauncher• EmailAddressChooserTask• PhoneNumberChooserTask• Game Invite – Used in XNA Games• Gamer Card – Used in XNA Games

Launchers, Choosers And Tombstone

Demo

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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