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Understanding Windows Phone Location Services Architecture
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A Windows Phone device can determine its current position on the surface of the earth in one of three ways. The first approach is to use the built-in GPS receiver, which uses satellites and is the most accurate, but which also consumes the most power. The second and third approaches are to use Wi-Fi and the triangulation of the cell phone towers, which are much less accurate then GPS receiver but consume less power. Fortunately, the Windows Phone Location Service automatically decides which option is best for the location of a device and presents its best guess of longitude and latitude through the Bing Maps location service. With a longitude and latitude reading in hand, an application can plot it on a Bing Maps Silverlight control map. Or you can use a street or civic address returned by the on-board location service to query the Bing Maps web service for its corresponding GPS coordinates (longitude and latitude) and plot them on a Bing Maps map. In upcoming sections, you will learn to take advantage of the Windows Phone s GPS receiver to track your movements and also learn to plot an address on the Bing Maps Silverlight control using the Microsoft Bing Maps service.
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CHAPTER 14 USING LOCATION SERVICES
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Introducing the Windows Phone Location Service and Mapping APIs
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In order to use the location service on a device, you need to reference the System.Device assembly and declare System.Device.Location in your code. And before you can take advantage of the location service, you must enable the location service on the phone by going to Settings Location turn on Location Services option. You can detect whether the phone s location service is enabled using the StatusChanged event of GeoCoordinateWatcher, as seen in the following code. GeoCoordinateWatcher geoCoordinateWatcher; geoCoordinateWatcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High); geoCoordinateWatcher.MovementThreshold = 100; // in Meters geoCoordinateWatcher.StatusChanged += (s, e) => { if (e.Status == GeoPositionStatus.Disabled) { MessageBox.Show("Please enable your location service by going to Settings -> Location -> Turn on Location Services option."); } }; Another way to check if the location service is enabled is to use TryStart to see if the GeoCoordinateWatcher can be started. if (!_geoCoordinateWatcher.TryStart(true, TimeSpan.FromSeconds(5))) { MessageBox.Show("Please enable Location Service on the Phone.", "Warning", MessageBoxButton.OK); } Next you have to set DesiredAccuracy and provide MovementThreshold in GeoCoordinateWatcher as seen in the foregoing code. GeoPositionAccuracy.Default will use Wi-Fi or the cell phone towers and depends on the availability of the sources. Windows Phone will automatically choose one to use, and GeoPositionAccuracy.High will use the GPS receiver built into the phone device. MovementThreshold is a very important property to set because MovementThreshold specifies the change in distance in meters before the PositionChanged event notifies the application that new coordinates are available; the lower the value of MovementThreshold, the more accurately the position will be tracked, but you will pay a price in higher power consumption. Microsoft recommends that you set MovementThreshold to at least 20 meters to filter out this noise. In the following sections, you will learn how to use the Windows Phone Location Service by simulating the behavior of the GPS receiver. This simulation allows you to test location-aware applications, like the ones you ll build in this chapter, in the emulator, which lacks a real GPS receiver.
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Simulating the Location Service
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In order to simulate use of the location service, you will be intercepting the GeoCoordinateWatcher s PositionChanged event using an Observable object. With an Observable object, you can subscribe to an event and then stream the data received to the subscribed event delegates. For the examples in this chapter, you will subscribe to the PositionChanged event to feed GPS data to the parts of your application
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CHAPTER 14 USING LOCATION SERVICES
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that consume it. The use of Observable objects is covered in more detail in 18, Reactive Extensions.
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