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Introducing Windows Phone 7 Launchers and Choosers
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When an application executes, the Windows Phone 7 OS confines it to its own space, or sandbox. Both memory and file storage are isolated within that sandbox one application cannot access or alter another s memory or file storage. Neither can one application directly call another or access a shared data store such as a list of contacts, for example. There are obvious reasons for this behavior; Microsoft must ensure that the Windows Phone 7 platform is as secure and stable as possible, and isolating applications is one giant step toward getting there. There is a set of built-in APIs that provide access to the most common features of Windows Phone 7. These APIs help us perform tasks, such as saving a contact s e-mail address or phone number, or placing a phone call (with the mandatory prior user authorization, of course), that require access to shared resources on the phone. Launchers and choosers, which can be thought of as system functions provided by the Windows Phone OS, provide you with the means to call into these applications. The difference between a launcher and a chooser is small but important: choosers provide a return value into the calling application, whereas launchers do not. If you think about a task of composing an e-mail message, for example, then
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CHAPTER 10 INTEGRATING APPLICATIONS WITH THE WINDOWS PHONE OS
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it is sufficient to fire and forget an e-mail application, allowing users to create and send an e-mail. A launcher is an ideal solution for this task. On the other hand, an application allowing us to select a photo from the photo library on the phone needs to pass the selected photo to our application. Windows Phone 7 provides a chooser to perform such a task. An important concept to remember is that launchers and choosers are separate applications. Since one of the core design principles behind Windows Phone 7 is to maximize battery life, only one application is allowed to execute on the phone at any time. Therefore, if you invoke a launcher or chooser from within your application, that launcher or chooser will replace your application and become the running application. Depending on the circumstances, your application may enter one of several states when that happens. We will cover the possibilities when we cover the application life cycle in depth later in this chapter, but in the meantime, Tables 10 1 and 10 2 list the launchers and choosers available on the Windows Phone 7 platform today. You ll find all of them in the Microsoft.Phone.Tasks namespace; therefore, to use any of them, be sure to import that namespace into your application.
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Table 10 1 lists launchers offered on the Windows Phone 7 platform, together with a brief description of functionality offered by each one of those launchers. Table 10 1. Windows Phone 7 Launchers and Their Functions
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EmailComposeTask MarketplaceDetailTask
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Launch the e-mail application with a new message displayed. Launch the Windows Phone Marketplace client application and display the details page for the specified product. Launch the Windows Phone Marketplace client application. Launch the Windows Phone Marketplace client application and display the review page for the specified product. Launch the Windows Phone Marketplace client application and display the search results from the specified search terms. Launch the media player. Launch the Phone application; use this to allow users to make a phone call from your application. Launch the Contacts application; use this to allow users to save an e-mail address from your application to a new or existing contact. Launch the Contacts application; use this to allow users to save a phone number from your application to a new or existing contact.
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MarketplaceHubTask MarketplaceReviewTask
MarketplaceSearchTask
MediaPlayerLauncher PhoneCallTask SaveEmailAddressTask
SavePhoneNumberTask
CHAPTER 10 INTEGRATING APPLICATIONS WITH THE WINDOWS PHONE OS
Launcher
SearchTask SmsComposeTask WebBrowserTask
Function
Launch the Web Search application. Launch the SMS application. Launch the Web Browser application.
Choosers
Table 10 2 lists and describes the choosers available on the Windows Phone 7 platform. Table 10 2. Windows Phone Choosers and Their Functions
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