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Encode QR Code 2d barcode in Office Word Declaring the UI Resources

Declaring the UI Resources
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Most of the namespaces you see in this snippet are typically declared by default when you first create a Windows Phone project. The following namespace is unique to this application and allows you to add the Bing Maps control you will use to plot your location: xmlns:BingMap="clrnamespace:Microsoft.Phone.Controls.Maps;assembly=Microsoft.Phone.Controls.Maps". <phone:PhoneApplicationPage x:Class="BingMapDemo.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:BingMap= "clr-namespace:Microsoft.Phone.Controls.Maps;assembly=Microsoft.Phone.Controls.Maps " FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" shell:SystemTray.IsVisible="True">
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Building the Main Page and Adding a Bing Maps Control
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To the main page, you will be adding a Bing Maps control to display your position and a button to start the location service. You ll also add an animation storyboard named BlinkLocator to cause the locator icon to blink by changing its color. Notice that inside bingMap control there is a BingMap:Pushpin named bingMapLocator. The map layer bingMapLocator contains an Ellipse control named locator, whose initial map position in latitude and longitude is (0, 0). In this application, the location service will provide changing positions in the latitude and longitude so that the locator position can be properly updated. This is a very simple but very powerful demonstration of using the location service and Bing Maps control. You can use the same technique for Yahoo or Google Maps, as their API is very similar to Bing Maps. <phone:PhoneApplicationPage.Resources> <Storyboard x:Name="BlinkLocator" AutoReverse="True" RepeatBehavior="Forever"> <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" Storyboard.TargetName="locator"> <EasingColorKeyFrame KeyTime="0" Value="Red"/> <EasingColorKeyFrame KeyTime="0:0:1" Value="#FFCEFF00"/> </ColorAnimationUsingKeyFrames>
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CHAPTER 14 USING LOCATION SERVICES
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</Storyboard> </phone:PhoneApplicationPage.Resources> <Grid x:Name="LayoutRoot" Background="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="24,24,0,12"> <TextBlock x:Name="ApplicationTitle" Text="Bing Map Demo" Style="{StaticResource PhoneTextNormalStyle}"/> </StackPanel> <Grid x:Name="ContentGrid" Grid.Row="1"> <BingMap:Map Name="bingMap" NavigationVisibility="Collapsed" Margin="0,0,0,72"> <BingMap:Pushpin Name="bingMapLocator"> <BingMap:Pushpin.Content> <Ellipse Fill="Red" Width="20" Height="20" BingMap:MapLayer.Position="0,0" Name="locator" /> <BingMap:Pushpin.Content> </BingMap: Pushpin> </BingMap:Map> <Button Content="Start" Height="72" HorizontalAlignment="Right" Margin="0,633,0,0" Name="btnStart" VerticalAlignment="Top" Width="160" Click="btnStart_Click" /> <TextBlock Height="30" HorizontalAlignment="Left" Margin="6,657,0,0" Name="txtStatus" Text="Status" VerticalAlignment="Top" Width="308" /> </Grid> </Grid> </phone:PhoneApplicationPage>
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Tip Notice here that we changed the content of the Pushpin, which is the locator that specifies where you are. You can add any type of control and change the appearance of the Pushpin. You can even put a placeholder and dynamically change the content of the Pushpin.
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Once you have loaded the XAML code, you should see the layout shown in Figure 14 8. In the next section, you will be adding an event to consume the GPS data and then to plot the data onto the map layer of the Bing Maps Silverlight control.
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CHAPTER 14 USING LOCATION SERVICES
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Figure 14 8. BingMapDemo design view
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Coding the Application
In Solution Explorer, open MainPage.xaml.cs and replace the code there with the following C# code blocks, which will implement the media player s functionalities.
Specifying the Namespaces
Begin by listing the namespaces the application will use. Notice the inclusion of Microsoft.Maps.Control, which will allow you to manipulate Bing Maps control, and System.Device, which will allow you to work with geoCoordinateWatcher, which will retrieve the location data from GPS, Wi-Fi, or cellular towers. using using using using using System; System.Windows; Microsoft.Phone.Controls; Microsoft.Maps.MapControl; System.Device.Location;
CHAPTER 14 USING LOCATION SERVICES
namespace BingMapDemo { public partial class MainPage : PhoneApplicationPage {
Initializing Variables
The variable _geoCoordinateWatcher is an instance of the location service class that you ll use to access and retrieve location data. Notice that you will be using GeoPositionAccuracy.High, which will use the phone device s GPS, and for this to work you must use the real Windows Phone device. If you need to simulate the location service, you can refer to the previous section in this chapter or 18 ( Reactive Extensions ) to simulate fake GeoCoordinateWatcher service. Also here you will be setting MovementThreshold to 100 meters so that the PositionChanged event fires every 100 meters, and you will be plotting your current location on the Bing Maps map. GeoCoordinateWatcher has StatusChanged and PositionChanged events that notify the application whenever the new updated position is received from the GPS. As for bingMap, you will hide the Microsoft Bing Maps logo and copyright in order to make things cleaner and make more space for other controls for the application. Finally, in order to use the map control at all, you must set ClientTokenCredentialsProvider to the value of the application key you obtained when you registered at the Bing Maps site. GeoCoordinateWatcher _geoCoordinateWatcher; public MainPage() { InitializeComponent(); // Add your own BingMap Key bingMap.CredentialsProvider = new ApplicationIdCredentialsProvider("ADD-YOUR-OWN-KEY"); // Remove Bing Maps logo and copyrights in order to gain // extra space at the bottom of the map bingMap.LogoVisibility = Visibility.Collapsed; bingMap.CopyrightVisibility = Visibility.Collapsed; // Delcare GeoCoordinateWatcher with high accuracy // in order to use the device's GPS _geoCoordinateWatcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High); _geoCoordinateWatcher.MovementThreshold = 100; // Subscribe to the device's status changed event _geoCoordinateWatcher.StatusChanged += new EventHandler<GeoPositionStatusChangedEventArgs>( _geoCoordinateWatcher_StatusChanged); // Subscribe to the device's position changed event // to receive GPS coordinates (longitude and latitude) _geoCoordinateWatcher.PositionChanged += New EventHandler<GeoPositionChangedEventArgs<GeoCoordinate>>( _geoCoordinateWatcher_PositionChanged); }
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