Windows Phone 8 - location and maps
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  • 1. Toan Huynh Technical Evangelist Location and Maps
  • 2. Agenda Location and Maps on Windows Phone 8 Introducing the new Location API and the new Maps Controls Windows Phone Runtime Location API How to Get the Phone’s Current Location How to Continuously Track the Phone’s Location How to Run Location-Tracking Apps in the Background Getting Started with the New Map Control Specifying Map Center and Zoom Animating Map Display Using Map Views
  • 3. 8/14/2013Microsoft confidential3 Windows Phone 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 8/14/20135
  • 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 DesiredAccuracy property 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 8/14/2013‹#›
  • 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 Service API to any other service or other person (including advertising networks), your application must implement a method to obtain opt-in consent. … 8/14/20139
  • 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 8/14/2013Microsoft confidential12
  • 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 8/14/2013
  • 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 8/14/2013Microsoft confidential14
  • 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: 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 8/14/2013Microsoft confidential16
  • 16. 17 Demo 2 Tracking Phone Position
  • 17. • Normally, when your user navigates away from your app, it is made dormant and all activity – including location tracking – is suspended • In Windows Phone 8, a location-tracking app 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 8/14/2013Microsoft confidential18
  • 18. • Edit WMAppManifest.xml using the XML (Text) Editor • Replace <DefaultTask> element as shown Enable Background Execution 19
  • 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 8/14/2013Microsoft confidential20
  • 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 8/14/2013Microsoft confidential21
  • 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. 23 Demo 3 Background Location Tracking
  • 23. • 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 8/14/2013Microsoft confidential24
  • 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; } 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) 8/14/2013Microsoft confidential25
  • 25. 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) 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) 8/14/2013Microsoft confidential26
  • 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 8/14/201329
  • 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 8/14/2013Microsoft confidential31
  • 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 animation you want to see (None, Linear or Parabolic) when the view changes MapViews 8/14/2013Microsoft confidential32
  • 32. • Set the cartographic mode of the map with the CartographicMode property Cartographic Mode 8/14/2013Microsoft confidential33 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 8/14/2013Microsoft confidential34 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 8/14/2013Microsoft confidential35
  • 35. • 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 8/14/2013Microsoft confidential37
  • 36. 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 8/14/2013Microsoft confidential38
  • 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 8/14/2013Microsoft confidential39
  • 38. 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 8/14/2013Microsoft confidential40
  • 39. New Maps Launchers in Windows Phone 8.0
  • 40. MapsTask MapsTask makes 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();
  • 41. • Launching built-in Maps tasks with directions enabled is trivial too! MapsDirectionsTask 44 // 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();
  • 42. • 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();
  • 43. • 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();
  • 44. Review • Windows Phone Runtime location API is new in Windows Phone 8. It has the following features: • 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
  • 45. The information herein is for informational purposes only an represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. © 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.