O'Reilly logo

Beginning Windows® Phone 7 Application Development: Building Windows® Phone Applications Using Silverlight® and XNA® by Robert Fonseca-Ensor, Karli Watson, Nick Lecrenski

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

CHAPTER 8 EXERCISE SOLUTIONS

Exercise 1 Solution

The most appropriate answer is b. Answer c is also correct, but it's far too narrow a definition because web services can do much more.

Exercise 2 Solution

To start with, you would use location services only if requested, perhaps with a “near me” link. You might provide other options, such as letting users choose from a list of locations. You would then perform a one-shot location detection to locate nearby restaurants, and then you'd shut off the location service again. Default accuracy would be enough for this. If you were to also provide route-finding functionality to help users find restaurants, you might use high accuracy and keep the location service running while the user gets to the location.

Exercise 3 Solution

You use the GeoCoordinateWatcher class for obtaining location information.

Exercise 4 Solution

You use the GeoCoordinate.GetDistanceTo() method, which gets the distance between two GeoCoordinate instances, in meters.

Exercise 5 Solution

Before using the Bing Maps Silverlight control, you must obtain a usage key.

Exercise 6 Solution

You use the Scale class, which you would include in XAML as follows:

<m:Map CredentialsProvider=“<My Key>”
  <m:Map.Children>
    <o:Scale />
  </m:Map.Children>
</m:Map>

This code assumes the following namespaces:

xmlsn:m=“clr-namespace:Microsoft.Phone.Controls.Maps; assembly=Microsoft.Phone.Controls.Maps” xmlsn:o=“clr-namespace:Microsoft.Phone.Controls.Maps.Overlays; assembly=Microsoft.Phone.Controls.Maps” ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required