Windows Phone 8 Maps and Location Services

Adina TrufinescuProgram Manager Windows Phone Developer Platform

Agenda

Location Service APIs

Map Control and Services

Location Tracking in Background

Fast Resume

Location Service API

Periodic and distance based trackingDesired accuracy in metersSingle location requestCaching and timeoutPosition source

Location for Windows Phone 8

.Net APIs

Windows RuntimeAPIs

Track location changesDesired accuracy Movement thresholdPositionChangedStatusChangedStart & Stop

A-GPS

Wi-fi

Cell

Location Trackingprivate Geolocator trackingGeolocator;private TypedEventHandler<Geolocator, PositionChangedEventArgs> positionChangedHandler; public void StartTracking(){ trackingGeolocator = new Geolocator(); trackingGeolocator.MovementThreshold = 100; // or trackingGeolocator.ReportInterval = (uint)TimeSpan.FromSeconds(30).TotalMilliseconds;

  positionChangedHandler = (geolocator, eventArgs) => {}; trackingGeolocator.PositionChanged += positionChangedHandler;}public void StopTracking(){ trackingGeolocator.PositionChanged -= positionChangedHandler;}

Single Location Request

public async Task<Geocoordinate> GetSinglePositionAsync(){ Geolocator geolocator = new Geolocator();  geolocator.DesiredAccuracyInMeters = 10;

Geoposition geoposition = await geolocator.GetGeopositionAsync(TimeSpan.FromMinutes(1), TimeSpan.FromSeconds(30));

  return geoposition.Coordinate;}

Tips for Location Apps

Use single location request when you can

Leverage caching for faster results

Find the right tradeoff between accuracy and timeout

Is wifi on?

Map Control and Services

Windows Phone 8 Map Control

Nokia Mapping Data110+ Countries, vector maps, 3D landmarks, new map modes

Offline MapsDownloadable by users, MapsDownloader tasks expose download and update to developers

Map ControlSmooth interactions, lag-less overlays, rotation, pitch

Route DisplayEasy to display Route calculated via Maps Services

Windows Phone Maps Services

Geocoding Latitude,Longitude to Address

Reverse Geocoding Address to Latitude,Longitude

RoutingRouteQuery, Route, RouteLeg, RouteManeuver

Part of Windows Phone ToolkitMapsUserControlPushPinToGeoCoordinate

Windows Phone Map and Services APIMap Control &ServiceAPIs

Map ToolkitExtensions

ID_CAP_MAP and ID_CAP_LOCATION

Developer Token assigned through Windows Phone Developer Center

.Net

Map Control and Services Demo

Mike O’MalleyProgram Manager

Windows Phone 7.x Maps API

Deprecated for Windows Phone 8 AppsBing Maps ControlBing Maps Task

Continue to use for 7.x apps

Map Control and Services Takeaway

Map Control and Maps Services APIs powered by Nokia

Map Extensions Toolkit

Users can manage offline maps

Bing Map control is deprecated for 8.0

Location Tracking in Background

Location Tracking in BackgroundApp manifest:<defaultTask Name="_default" NavigationPage="MainPage.xaml" >    <BackgroundExecution>      <ExecutionType Name="LocationTracking" />    </BackgroundExecution ></defaultTask>

Actively listen for location change events

16

Background Execution Constraints

XAML apps only

A single Location Tracking App runs in the background

App runs with limited access to resources

17

Resource ManagementCPU allocation is capped at 10%App has access to• Location• Audio\Speech• Network• Storage• Sensors

No access to Camera, MicrophoneShellToast and ShellTile.Update

User Awareness and ControlID_CAP_LOCATION

Users can close the running app

Users can disable background functionality per app

DeactivationApp runs in the background until:• App stops tracking location• User disables Location Services• 4 hours without bringing the app in the foreground• Battery Saver ON• Another Location Tracking app moves to background• Low memory

DeactivationReason providedNotify the user!

Location Tracking in Background Demo

App Lifecycle Events

PhoneApplicationServiceLaunchingDeactivated

RunningInBackgroundActivatedClosed

Application Lifecycle

running

deactivated

suspended

activated

tombstoned

Activ

ated

deactivated

Deactivated

Application Lifecycle for Location Tracking

running

running in background

suspended

activated

tombstoned

Activ

ated

RunningInB

g

deactivated

Application Lifecycle – Launching&Closing

Not Running ClosingRunningLaunchin

g

Running in Background

Launching

Launching

Closing

Application Lifecycle – Launching&Closing

Not Running ClosingRunningLaunchin

g

Running in Background

Launching

Launching

Closing

RunningInBg

Closing

Tips for Running in Background Use sound and toasts wisely

Inform the user when the app was deactivated

Stop active timers and animations

Stop tracking location when done

Optimize for Fast Resume

What is Fast Resume?

Fast Resume for Windows Phone 8 Apps“Replace” is the default activation policyOpt-in to “Resume" via manifest setting

<defaultTask Name ="_default" NavigationPage="MainPage.xaml" ActivationPolicy="Resume"/>

Apps are still suspended or tombstoned

Fast Resume UXResume previous experience for Primary tilewhen previously launched via Primary tile

Start fresh for Deep Linkswhen previously launched via Primary tile or a different Deep Link

Don’t block OnBackKeyPressthis is how users close your app

30

Backstack – Do nothing

Backstack – Clear page stack

Reset: Clear the page stack

Backstack – Clear page stack

Backstack - Cancel navigation

Reset: Cancel navigation

Backstack - Cancel navigation

Navigation Events

NavigationMode.Resetraised on page at the top of the backstack; indicates that the app is relaunched

NavigationMode.Newraised when a page is created for new launch Uri

NavigationMode.Refresh raised when launch Uri is same as the page at the top of the backstack

NavigationMode.Reset

Top Page OnNavigatedTo

Top Page OnNavigatedFrom

NavigationMode.New

NavigationMode.Reset

New Page OnNavigatingTo

NavigationMode.New

Clear Page Stack

Cancel Navigation

NavigationMode.Reset - Resume

Top Page OnNavigatedTo

Top Page OnNavigatedFrom

NavigationMode.New

NavigationMode.Reset

Cancel Navigation

Top Page

Resume!!

!

NavigationMode.Reset – Start Fresh

Top Page OnNavigatedTo

Top Page OnNavigatedFrom

NavigationMode.New

NavigationMode.Reset

New Page OnNavigatingTo

NavigationMode.New

Clear Page Stack

Fast Resume Demo

Fast Resume Takeaway

Main Tile: Resume!

Deep Links: Clear the back stack

OnBackKeyPress: Do not block

Test relaunch: between primary tile and deep links

Don’t forget Tombstoning!

In Conclusion…

Take Away

Map Control and Map Services powered by Nokia

Windows Runtime Location APIs

Background Execution for Location Tracking Apps

Want to resume fast? Use Fast Resume!

Maps Toolkit Extension @

http://phone.codeplex.com

App to App Communication Session

Resources

Questions?

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