WINDOWS PHONE 7 DEVELOPER GUIDE

A guide to 3 screens and the cloud

Scott DensmoreSr. Software Development Engineer

Microsoft patterns & practices

ABOUT YOU (AN ASSUMPTION)

• You… • are a developer• know C#• are building applications for Windows Phone 7• are building applications for other mobile platforms• want to connect your mobile application to the cloud

GOALS FOR THIS SESSION

• Intro Windows Phone 7• How to build applications for Windows Phone 7

• Simple examples• How to connect your Windows Phone 7

application to the cloud• TailSpin survey application connected to Windows

Azure

WINDOWS PHONE 7

METRO

METRO

• Clean, light, open, fast• Celebrate typography• Alive & in motion• Content not chrome• Authentically digital

Metro Principals

WHAT ARE YOU BUILDING?Silverlight vs XNA

WHAT ARE YOU BUILDING?

• Performance is impressive, especially in 3D• Hardware based graphics acceleration

• There are some very interesting input options• You can use all the hardware and sensors in

your Windows Phone games• Potential for Xbox Live integration

• Support for Avatars and Achievements• Support for in-game advertising

• Viable alternative to charging for your code

XNA

WHAT ARE YOU BUILDING?

• Do not try to adapt an existing UI design directly to the phone

• Design for both portrait and landscape• Place menus and other options at the bottom so

the users hand does not obstruct the rest of the content

• Provide feedback to actions• Set the InputScope for text controls• Follow the Windows Phone 7 Design Guidelines

Considerations

DEMO

What are you building?

CONNECTIVITY

CONNECTIVITY

• Device is occasionally connected• Signal can switch between Wi-Fi to GPRS

(General Packet Radio Service)• Have an offline experience

Considerations

DEMO

Connectivity

SHARED ENVIRONMENT

SHARED ENVIRONMENT

• Minimize device resource usage• e.g. Only enable GPS when you need it

• Use async programming techniques • Reactive Extensions

• Optimize memory usage• Maximize GPU usage• Do not use all of the storage for your application• Mango – Multi-tasking

Considerations

STORAGE

STORAGE

• Isolated storage is used to store data

• 256 MB of memory and to 8 GB of flash

• Serializable collections is a good way to store data

• Third party databases are available

• Mango – includes SQL CE

hardware

phone storage

STORAGE

• Use the DeviceExtendedProperties to check for memory installed and avialble

• Clean up resources that are no longer needed• Consider using a cache to improve performance• Compress data or use data formats that are

compact (JSON / Binary)

Considerations

SECURITY

SECUIRTY

• Use HTTPS when connecting to services• Encrypt data that you store on the phone• User HTTPS when communicating with the Push

Notification Service• Do not store sensitive data and keys on the

device• Mango – DPAPI

Considerations

INTERRUPTIONS

INTERRUPTIONS

• Many events can cause interruptions on the phone• Camera task• Email task• A phone call

• Handle the events exposed by the operating system to save state of the application (Tombstoning)

Considerations

DEMO

Tombstoning

TAILSPINWhy Phone + Cloud?

BUILDING THE CLIENT

BUILDING THE CLIENTOverview

BUILDING THE CLIENTMVVM

DEMO

Building the Client

CONNECTING TO THE CLOUD

Why Phone + Cloud?

• The cloud levels the playing field

• The cloud provides a larger pool of resources from which to pull

• The cloud provides a way to reach across device platforms

CONNECTING TO THE CLOUD

• HTTP-based, request/response• Framework choices (WCF, OData, WebRequest,

etc.)• Wire format choices (SOAP, JSON, POX, etc.)

Services

CONNECTING TO THE CLOUDTailSpin Services

CONNECTING TO THE CLOUDPush Notifications

HTTP Post to URI with payloadPush URI request/response

Push enabled application

Push client service

1

Push client/server negotiation

2

3

Push URI to Cloud Service 4

5

Push notification to device6

Cloud Service

MPNS

Windows Phone 7

CONNECTING TO THE CLOUDTailSpin Push Notifications

DEMO

Connecting to the Cloud

RESOURCES

• WP7 Book• http://wp7guide.codeplex.com

• Windows Phone 7• http://www.windowsphone.com

• Me• scottden@microsoft.com• @scottdensmore• http://scottdensmore.typepad.com

QUESTIONS?After the session please fulfil the questionnaire.

Questionnaires will be sent to you by e-mail and will be available in the profile section of the NT Conference website www.ntk.si .

Thank you!