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Development Process Goals Tailspin also identified a number of goals that relate to their own development processes. The following table lists some examples.
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Goal description Tailspin wants to have highly testable code. Tailspin wants to able to support other mobile platforms in the future. Tailspin wants to have an efficient development process. Example A significant advantage of the MVVM pattern is that it makes the code more testable. Using standards-based approaches to interact with the back end makes it easier to develop other clients for other platforms. Developers and designers can work in parallel. Designers can prototype and build the UI using Microsoft Expression Blend design software while the developers focus on the application s logic. The current version of the application uses an abstract persistence model to wrap local isolated storage on the device. Tailspin could easily change this to use Microsoft SQL Server Compact Edition in the future.
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The Windows Phone 7 platform is new, so expect it to change and design your application so that you can easily modify it to use new features.
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Tailspin wants to be able to adapt the application to work with any new capabilities of future versions of the Windows Phone 7 platform.
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Figure 1 shows the main components that comprise the Tailspin Surveys client application.
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The Components of the Mobile Client Application
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Notifcation Services
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Storage
Synchronization Services
Network Services
Tailspin Backend in the Cloud
Tailspin Surveys Mobile Client Application
figure 1 The Tailspin Surveys client application
building the mobile client
The developers at Tailspin built three key components of the application: the UI, the storage sub-system, and the synchronization service. The application also uses some components of the Windows Phone 7 platform, in particular the on-board device sensors, the notification services, and the network services that the application uses to communicate with the back-end web services. This chapter focuses on the UI components and also describes how the application components are linked together through Tailspin s implementation of the MVVM pattern. 5, Using Services on the Phone, will examine the storage and synchronization components, and 6, Connecting with Services, will look at the notification process and the integration with the back end in more detail. There is some discussion of device sensors in this chapter, but you will find more in-depth information in Appendix C, Leveraging Device Capabilities.
The application uses a number of features offered by the Windows Phone 7 platform.
Figure 2 shows the structure of the Tailspin Surveys mobile client application in more detail. For clarity, the diagram does not show all the links between all the components. In particular, multiple links exist between the model components and the view model and the application services, but showing all of these would unnecessarily clutter the diagram.
The Structure of the Tailspin Surveys client Application
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Views
WMAppManifest.xaml
<Task> <DefaultTaskName = _default NavigationPage= Views/SurveyList/SurveyListView.xaml > </Tasks>
AppSettingsView.xaml
FilterSettingsView.xaml
SurveyListView.xaml
TakeSurveyView.xaml Question Views
View Models
AppSettingsViewModel SurveyListViewModel
FilterSettingsViewModel
TakeSurveyViewModel
Models
TenantItem Question QuestionAnswer QuestionType SurveyAnswer SurveyTemplate
OpenQuestionViewModel MultipleChoiceQuestionViewModel FiveStarsQuestionViewModel PictureQuestionViewModel VoiceQuestionViewModel
Application Services
Settings Store
Tombstoning
Surveys Store
App.xaml ViewModelLocator Noti cation Service Surveys Synchronization Service Other Infrastructure Services
Network
figure 2 Tailspin Surveys mobile client application structure
To understand how Tailspin built the UI components (such as the SurveyListView page and the AppSettingsView page), how the navigation between the pages work, and how the application determines which page to display to the user when the user launches the application, you should read the section, The Design of the User Interface, later in this chapter.
building the mobile client
To understand how and why Tailspin uses the MVVM pattern, you should read the section, Using the Model-View-ViewModel Pattern, later in this chapter. This section explains the roles of the view, view model, and model components and how they are linked together, including the role of the ViewModelLocator class. This section also describes some data binding scenarios in the application, including the way the application uses the Pivot control on the SurveyListView page and the Panorama control on the TakeSurveyView page. To understand how the application manages its state when it s tombstoned, you should read the section, Handling Activation and Deactivation, in 5, Using Services on the Phone. Note: An application is tombstoned by the Windows Phone 7 device when, for example, the user navigates to another application or answers a call while using the application. The application should preserve any state it needs to return to the correct state when it is reactivated. To understand how the application manages persistent data on the phone, such as application settings and survey responses, you should read the section, Using Isolated Storage on the Phone, in 5, Using Services on the Phone. To understand how the Tailspin Surveys cloud application can notify the mobile client of new surveys by using the push notification service, you should read 6, Connecting with Services. To understand how the application transfers survey data between the mobile client application and the cloud application, you should read 6, Connecting with Services. Dependency Injection The developers at Tailspin use a dependency injection container to manage the instantiation of many of the classes, including the view model classes, in the application. Tailspin uses the Funq dependency injection container (available at http://funq.codeplex.com/) instead of the Unity Application Block (Unity) because Unity requires the ability to emit Microsoft intermediate language (MSIL) code, which is not currently possible on the Windows Phone 7 platform. The Funq dependency injection container is also lightweight and fast. The ContainerLocator class shows how the application creates the registrations and mappings in the Funq dependency injection container. In the Tailspin mobile client application, the ViewModel Locator instantiates the ContainerLocator object and is the only class in the application that holds a reference to a ContainerLocator object.
Dependency injection enables decoupling of concrete types from the code that depends on these types. It uses a container that holds a list of registrations and mappings between interfaces and abstract types and the concrete types that implement or extend these types.
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