Maps and location for windows phone.

1. Location and Maps
Nguyen Tuan | Microsoft Certified Trainer

2. Agenda
 RuntimeLocation API
 Current Location
 How to Continuously Track the Phone’s Location
 How to Run Location-TrackingApps in the Background
 How to use Map Control
 Specifying Map Center and Zoom
 Animating Map Display Using Map Views

3. 8/16/2014 3
WP Runtime
Location API

4. Location APIs on Windows Phone 8
• .NET Location API from Windows Phone OS 7.1 is still
supported
• System.Device.Location.GeoCoordinateWatcher and related
classes
• New Windows Phone Runtime location API
• Accessible from managed and native code
• Improved ability for one-shot location acquisition
• Improved capabilities for location tracking
• Convergent with Windows 8 location API

5. ID_CAP_LOCATION Capability
• You must include the ID_CAP_LOCATION capability in your app
manifest
• If you forget, calls to location APIs throw an
UnauthorizedAccessException
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6. Location Sources
Location
Services
+ Accuracy
- Power
- Speed
- Indoors
- Accuracy
+ Power
+ Speed
- Wilderness
+/- Accuracy
+/- Power
+/- Speed
+/- Urban areas
GPS
Cell Towers
WiFi

7. • You can’t!
• You can set the DesiredAccuracyproperty of the Geolocator object:
• PositionAccuracy.High – if you want the most accurate data available, but at the cost of increased
battery usage, network bandwidth and possibly monetary charges from wireless network operators.
Often this causes the GPS to be activated
• PositionAccuracy.Default – to optimize for power
• You can also set the DesiredAccuracyInMeters property to indicate to
the Geolocation service the desired accuracy of any results
• However, the Geolocation service determines the best location data to
provide to the application
Controlling the Sources the Geolocation Service Uses
8/16/2014 ‹#›

8. How to Get the Phone’s Current Location
private async void OneShotLocation_Click(object sender, RoutedEventArgs e)
{
Geolocator geolocator = new Geolocator();
geolocator.DesiredAccuracyInMeters = 50;
try
{
Geoposition geoposition = await geolocator.GetGeopositionAsync(
maximumAge: TimeSpan.FromMinutes(5),
timeout: TimeSpan.FromSeconds(10)
);
LatitudeTextBlock.Text = geoposition.Coordinate.Latitude.ToString("0.00");
LongitudeTextBlock.Text = geoposition.Coordinate.Longitude.ToString("0.00");
}
catch (UnauthorizedAccessException)
{
// the app does not have the right capability or the location master switch is off
StatusTextBlock.Text = "location is disabled in phone settings.";
}
}

9. User Consent
• Application certification requirements on user consent still the same
as in 7.1
• If you are using location data just within your app, you do not need to
ask explicitly for user consent (although they give consent when they
install your app)
• You only have to get user consent if you plan to make location data
available to any other service or other person:
2.7.4 If your application publishes or makes available location data obtained from the Location ServiceAPI to
any other service or other person (including advertising networks), your application must implement a method to
obtain opt-in consent. …
8/16/2014 9

10. • Windows Phone Emulator comes with Location simulator
Location on Emulator
10

11. • If your app only needs the user’s location at
the current time, use GetGeopositionAsync
as already described
• Continuously tracking the user’s location
drains the user’s battery more and should
only be used for apps that require it
Location Tracking
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12. private void TrackLocation_Click(object sender, RoutedEventArgs e)
{
if (!tracking) {
geolocator = new Geolocator();
geolocator.DesiredAccuracy = PositionAccuracy.High;
geolocator.MovementThreshold = 100; // The units are meters.
geolocator.StatusChanged += geolocator_StatusChanged;
geolocator.PositionChanged += geolocator_PositionChanged;
tracking = true;
}
else {
geolocator.PositionChanged -= geolocator_PositionChanged;
geolocator.StatusChanged -= geolocator_StatusChanged;
geolocator = null;
tracking = false;
}
}
How to Track Location
8/16/2014

13. void geolocator_StatusChanged(Geolocator sender, StatusChangedEventArgs args)
{
string status = "";
switch (args.Status)
{
case PositionStatus.Disabled:
// the application does not have the right capability or the location master switch is off
status = "location is disabled in phone settings";
break;
case PositionStatus.Initializing:
// the geolocator started the tracking operation
status = "initializing";
break;
case PositionStatus.NoData:
// the location service was not able to acquire the location
status = "no data";
break;
Geolocator Status
8/16/2014 13

14. void geolocator_StatusChanged(Geolocator sender, StatusChangedEventArgs args)
{
string status = "";
switch (args.Status)
{
case PositionStatus.Disabled:
// the application does not have the right capability or the location master
switch is off
status = "location is disabled in phone settings";
break;
case PositionStatus.Initializing:
// the geolocator started the tracking operation
status = "initializing";
break;
case PositionStatus.NoData:
// the location service was not able to acquire the location
status = "no data";
break;
case PositionStatus.Ready:
// the location service is generating geopositions as specified by the
tracking parameters
Geolocator Status

15. void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs
args)
{
Dispatcher.BeginInvoke(() =>
{
LatitudeTextBlock.Text =
args.Position.Coordinate.Latitude.ToString("0.00");
LongitudeTextBlock.Text =
args.Position.Coordinate.Longitude.ToString("0.00");
});
}
Position Changed
8/16/2014 15

16. Demo
LocationTracker
16

17. • Normally, when your user navigates away from your app, it is made
dormant and all activity – includinglocation tracking – is suspended
• In Windows Phone 8, a location-trackingapp can continue to run in the
background after the user navigates away, as long as the app continues
to actively track location
• This feature enables scenarios such as an app that provides turn-by-turn
directions or a run tracker
Enable Location Tracking in the Background
8/16/2014 17

18. • Edit WMAppManifest.xml using the XML (Text) Editor
•Replace <DefaultTask> element as shown
Enable Background Execution
18

19. • In App.Xaml, register an event handler for the RunningInBackground
event
• This event is raised when the user navigates away from your background execution-enabled app while
you are actively tracking location
• When this event is raised, your app should stop all tasks that are not related to location tracking,
including updates to the app’s UI
<Application.ApplicationLifetimeObjects>
<!--Required object that handles lifetime events for the application-->
<shell:PhoneApplicationService
Launching="Application_Launching" Closing="Application_Closing“
Activated="Application_Activated" Deactivated="Application_Deactivated“
RunningInBackground="Application_RunningInBackground"/>
</Application.ApplicationLifetimeObjects>
Register Event Handler for RunningInBackground
Event
8/16/2014 19

20. // Static variables global to application to support tracking
public static Geolocator Geolocator { get; set; }
public static bool RunningInBackground { get; set; }
// Code to execute when the application is activated (brought to foreground)
private void Application_Activated(object sender, ActivatedEventArgs e)
{
RunningInBackground = false;
}
// Code to execute when the application is deactivated and is tracking location
private void Application_RunningInBackground(object sender, RunningInBackgroundEventArgs e)
{
RunningInBackground = true;
// Suspend all unnecessary processing such as UI updates
}
Implement RunningInBackground Event Handler
8/16/2014 20

21. void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
{
if (!App.RunningInBackground)
{
Dispatcher.BeginInvoke(() => {
LatitudeTextBlock.Text = args.Position.Coordinate.Latitude.ToString("0.00");
LongitudeTextBlock.Text = args.Position.Coordinate.Longitude.ToString("0.00"); });
}
else
{ // DEMO purposes only: Show toast if running in background
Microsoft.Phone.Shell.ShellToast toast = new Microsoft.Phone.Shell.ShellToast();
toast.Content = args.Position.Coordinate.Latitude.ToString("0.00");
toast.Title = "Location: ";
toast.NavigationUri = new Uri("/Page2.xaml", UriKind.Relative);
toast.Show();
}
}
Do Not Update UI When Running in the Background
Example

22. • As we have seen, Background Location Tracking apps continue to run in the
background
• But if it is not actively tracking location when deactivated, it is made dormant as normal
• If the user launches *another* location tracking app and deactivates that, then your app will be made dormant
• If the user launches a new instance of the app, if there is a dormant instance,
that is reactivated instead
• Background Location Tracking apps get the Fast Application Resume behavior, which reactivates a dormant
application if the user launches a new copy
• The dormant instance of the app, including the history of visited app pages, is reactivated
• By default, the list of previously visited pages is cleared for these ‘Reset’
activations
• This may not be what you want…
App Lifecycle for Background Location Tracking Apps
Fast Application Resume
8/16/2014 22

23. private void InitializePhoneApplication()
{
...
// Handle reset requests for clearing the backstack
RootFrame.Navigated += CheckForResetNavigation;
...
}
private void CheckForResetNavigation(object sender, NavigationEventArgs e)
{
// If the app has received a 'reset' navigation, then we need to check
// on the next navigation to see if the page stack should be reset
if (e.NavigationMode == NavigationMode.Reset)
RootFrame.Navigated += ClearBackStackAfterReset;
}
Clearing Previously Launched Pages on Fast App
Resume
Add Logic to App.Xaml.cs to Check for Reset Navigation(Behavior Already Implemented in Project Templates)
8/16/2014 23

24. private void InitializePhoneApplication()
{
...
// Handle reset requests for clearing the backstack
RootFrame.Navigated += CheckForResetNavigation;
...
}
private void CheckForResetNavigation(object sender, NavigationEventArgs e)
{
// If the app has received a 'reset' navigation, then we need to check
// on the next navigation to see if the page stack should be reset
if (e.NavigationMode == NavigationMode.Reset)
RootFrame.Navigated += ClearBackStackAfterReset;
}
private void ClearBackStackAfterReset(object sender, NavigationEventArgs e)
{
// Unregister the event so it doesn't get called again
RootFrame.Navigated -= ClearBackStackAfterReset;
// Only clear the stack for 'new' (forward) and 'refresh' navigations
if (e.NavigationMode != NavigationMode.New && e.NavigationMode != NavigationMode.Refresh)
return;
// For UI consistency, clear the entire page stack
while (RootFrame.RemoveBackEntry() != null) { } // do nothing
}
Clearing Previously Launched Pages on Fast App
Resume
Add Logic to App.Xaml.cs to Check for Reset Navigation(Behavior Already Implemented in Project Templates)
8/16/2014 24

25. Demo
BackgroundLocationTracker

26. Maps

27. Maps APIs on Windows Phone 8
• Windows Phone 8 has new Map controls, accessible in
the following namespaces:
• Microsoft.Phone.Maps
• Microsoft.Phone.Maps.Controls
• Microsoft.Phone.Maps.Services
• The Bing Maps Control is still supported, but is
deprecated
• You should only use the Bing Maps Control when you upgrade
an app from Windows Phone OS 7.1 to Windows Phone 8
• Usage of the new Maps control differs from the Bing
Maps control

28. ID_CAP_MAP Capability
• You must include the ID_CAP_MAP capability in your app manifest
• If you forget, calls to location APIs throw an
UnauthorizedAccessException
8/16/2014 28

29. • Add a Map to your UI
•In XAML:
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<maps:Map x:Name="MyMap"/>
</Grid>
•In Code:
private void CreateMap()
{
Map MyMap = new Map();
ContentPanel.Children.Add(MyMap);
}
Map Control

30. • By default, map displays at zoom level
1 (world view) and centered at Lat: 0,
Long: 0
• Use the Center and ZoomLevel
properties to change this, in XAML or
in code
//Set the Map center by using Center property
MyMap.Center = new GeoCoordinate(47.6097, -
122.3331);
//Set the map zoom by using ZoomLevel property
MyMap.ZoomLevel = 10;
Center and Zoom Level
8/16/2014 30

31. • It is common to move a map display from one location to another
• A new map view is defined any time the position of the map is changed as a result of panning, zooming,
rotating, or tilting
• You can use the SetView method to define a map view.
This takes the following parameters:
• Center: A GeoCoordiante object defining the center of the map view
• ZoomLevel:zoom level between 1 and 20
• Heading: specifies the directional heading that is pointing “up” on the mapin geometric degrees between 0 and 360
• Pitch: specifies the degree to which the map is tilted as a value between 0 and 180
• BoundingRectangle:a LocationRectangle object that contains the Map control
• AnimationKind: sets the kind of animationyou want to see (None, Linear or Parabolic) when the view changes
MapViews
8/16/2014 31

32. • Set the cartographic mode of the map with the CartographicMode
property
Cartographic Mode
8/16/2014 32
Road (default) Aerial Hybrid Terrain

33. • You can display the map in a light or dark color mode by setting the
ColorMode property
Light and Dark Color Modes
8/16/2014 33
Light (default) Dark

34. • You can display additional elements on
your map, such as landmarks and
pedestrian features
•Set the LandmarksEnabled property to
true to display landmarks
•Set the PedestrianFeaturesEnabled to
true to display pedestrian features
• Landmarks are visible only when the
ZoomLevel is 7 or higher, and the Pitch
property is 25 or higher
Pedestrian Features and Landmarks
8/16/2014 34

35. Demo
1. BasicLocationandMap
2. MapViews
35

36. • Unlike the Bing Maps API, the Windows
Phone Maps API does not have a
specific PushPin object
• However, you can create your own
PushPins by drawing UIElements onto a
MapOverlay, then add the MapOverlay
to a MapLayer which you add to the
Map
Pushpins
8/16/2014 36

37. private Grid CreatePushpin()
{
//Creating a Grid element.
Grid MyGrid = new Grid();
MyGrid.RowDefinitions.Add(new RowDefinition());
MyGrid.RowDefinitions.Add(new RowDefinition());
MyGrid.Background = new SolidColorBrush(Colors.Transparent);
//Creating a Rectangle
Rectangle MyRectangle = new Rectangle();
MyRectangle.Fill = new SolidColorBrush(Colors.Black);
MyRectangle.Height = 20;
MyRectangle.Width = 20;
MyRectangle.SetValue(Grid.RowProperty, 0);
MyRectangle.SetValue(Grid.ColumnProperty, 0);
//Adding the Rectangle to the Grid
MyGrid.Children.Add(MyRectangle);
Creating a Pushpin
8/16/2014 37

38. private Grid CreatePushpin()
{
//Creating a Grid element.
Grid MyGrid = new Grid();
MyGrid.RowDefinitions.Add(new RowDefinition());
MyGrid.RowDefinitions.Add(new RowDefinition());
MyGrid.Background = new SolidColorBrush(Colors.Transparent);
//Creating a Rectangle
Rectangle MyRectangle = new Rectangle();
MyRectangle.Fill = new SolidColorBrush(Colors.Black);
MyRectangle.Height = 20;
MyRectangle.Width = 20;
MyRectangle.SetValue(Grid.RowProperty, 0);
MyRectangle.SetValue(Grid.ColumnProperty, 0);
//Adding the Rectangle to the Grid
MyGrid.Children.Add(MyRectangle);
Creating a Pushpin
8/16/2014 38

39. private void AddMapOverlay()
{
Grid MyGrid = CreatePushpin();
//Creating a MapOverlay and adding the Grid to it.
MapOverlay MyOverlay = new MapOverlay();
MyOverlay.Content = MyGrid;
MyOverlay.GeoCoordinate = new GeoCoordinate(47.6097, -122.3331);
MyOverlay.PositionOrigin = new Point(0, 0.5);
//Creating a MapLayer and adding the MapOverlay to it
MapLayer MyLayer = new MapLayer();
MyLayer.Add(MyOverlay);
MyMap.Layers.Add(MyLayer);
}
Drawing a UIElement onto a MapLayer
8/16/2014 39

40. Demo
LocationAndMaps
40

41. Maps Launchers

42. MapsTask
MapsTaskmakes launching the built-in Maps application easy
MapsTask mapsTask = new MapsTask();
//Omit the Center property to use the user's current location.
mapsTask.Center = new GeoCoordinate(47.6204, -122.3493);
mapsTask.SearchTerm = "coffee";
mapsTask.ZoomLevel = 17;
mapsTask.Show();

43. • Launchingbuilt-in Maps tasks with directions enabled is trivial too!
MapsDirectionsTask
43
// Get Directions
MapsDirectionsTask mapsDirectionsTask = new MapsDirectionsTask();
// You can specify a label and a geocoordinate for the end point.
// GeoCoordinate spaceNeedleLocation = new GeoCoordinate(47.6204,-122.3493);
// LabeledMapLocation spaceNdleLML = new LabeledMapLocation("Space Needle",
spaceNeedleLocation);
// If you set the geocoordinate parameter to null, the label parameter
// is used as a search term.
LabeledMapLocation spaceNdleLML = new LabeledMapLocation("Space Needle", null);
// If mapsDirectionsTask.Start is not set, the user's current location
// is used as start point.
mapsDirectionsTask.End = spaceNdleLML;
mapsDirectionsTask.Show();

44. • Use the map downloader task to enable users to
download map data for offline use
• The task launches the Maps settings application
which allows the user to select a region of map data
to download
MapDownloaderTask
MapDownloaderTask mapDownloaderTask = new
MapDownloaderTask();
mapDownloaderTask.Show();

45. • Use the map updater task to enable users to update map data
they have previously downloaded for offline use
• The task launches the Maps settings application which
immediately checks to see if there are updates available for
any previously downloaded map data
MapUpdaterTask
MapUpdaterTask mapUpdaterTask = new MapUpdaterTask();
mapUpdaterTask.Show();

46. Demo
MapsTask
46

47. Summaries
• Windows Phone Runtime location API is new in Windows Phone 8. It
has the followingfeatures:
• Accessible from managed and native code
• Greater support for one-shot location acquisition
• Support for Background Location Tracking
• Convergent with Windows 8
• Use the new Maps APIs in Windows Phone 8 to develop maps-based
apps, and incorporate location and search features
• Set Center and Zoom Level
• Animate to new location and zoom using map views
• Select Road, Aerial, Hybrid or Terrain cartographic display modes
• Draw UIElements onto a MapOverlay on top of the Map