This document provides an overview of building apps for Windows Phone 8.1. It discusses introducing the app development platform, page navigation, lists and controls, localization, data storage, background tasks, maps, camera, notifications, and tooling. It also covers new features in Windows Phone 8.1 like background task quotas and managing which apps can run in the background.

1. Andy Wigley | Technical Evangelist
Matthias Shapiro | Program Manager / Technical Evangelist

2. http://andywigley.com

3. http://blogs.msdn.com/b/matthiasshapiro/
http://codeiuse.tumblr.com

4. Building Apps for Windows Phone 8.1
01 | Introducing the Windows Phone 8.1 App
Development Platform
06 | Adapting UI for Different Screens and
Orientations
02 | Getting Started Building Windows
Runtime Apps
07 | Windows Runtime App Lifecycle
03 | Page Navigation and Data Binding in
Windows Runtime Apps
08 | Localization and Globalization in
Windows Runtime Apps
04 | Lists and List Items in Windows Runtime
Apps
09 | Data Storage, Backup and Roaming
05 | Programming Page Controls and Page
Transition Animations
10 | Sharing Files and Data in Windows
Phone 8.1

5. Building Apps for Windows Phone 8.1
11 | Background Tasks and Multitasking
16 | Interacting with User Data: Contacts and
Appointments
12 | Maps, Geolocation and Geofencing
17 | Camera, Media and Audio in Windows
Phone 8.1
13 | Networking, Mobile Services and
Authentication
18 | Enterprise in Windows Phone 8.1
14 | Tiles, Notifications and Action Center
19 | Programming SQLite on Windows
Phone 8.1
15 | Sensors and Proximity: NFC and
Bluetooth
20 | Tooling and Diagnostics

6. Building Apps for Windows Phone 8.1
21 | App packaging, monetization and
publication
22 | Best practices: Building Universal Apps
for Windows and Windows Phone
23 | Silverlight apps on Windows Phone 8.1

7. Windows XAML+
Silverlight 8.1
30 April 2014
Building Apps for Windows Phone 8.1 Jump Start

10. PeriodicTask, ResourceIntensiveTask

16. Trigger Notes
System Trigger Runs on a specified system event.
Events: UserPresent/Away, NetworkStateChange, InternetAvailable,
SessionConnected, ServicingComplete, TimeZoneChange
Note: LockScreenApplicationAdded and LockScreenApplicationRemoved are
not supported on Windows Phone
TimeTrigger Runs on a frequency (minimum gap of 30 minutes)
LocationTrigger Runs as user enters/leaves a geofenced location
MaintenanceTrigger Runs on a frequency (minimum gap of 30 minutes)
but only when the device is on AC power
PushNotificationTrigger Runs in response to an incoming raw push notification sent to the
app.

17. Trigger Notes
RfcommConnectionTrigger Bluetooth: when an RFCOMM connection has been established.
DeviceChangeTrigger Bluetooth: when an ACL connection has been created/destroyed.
BluetoothSignalStrengthTrigger Bluetooth: when signal strength goes outside of bounds.
GattCharacteristicNotificationTrigger Bluetooth: when a characteristic change is received from a Bluetooth
LE device

18. Condition
User[Not]Present
Internet[Not]Available
FreeNetworkAvailable
BackgroundWorkCostNotHigh
“run this task every 30 minutes if the internet is available”

21. async void RegisterBackgroundTasks()
{
// On Windows, RequestAccessAsync presents the user with a confirmation
// dialog that requests that an app be allowed on the lock screen.
// On Windows Phone, RequestAccessAsync does not show any user confirmation UI
// but *must* be called before registering any tasks
var access = await BackgroundExecutionManager.RequestAccessAsync();
// A 'good' status return on Phone is BackgroundAccess.AllowedMayUseActiveRealTimeConnectivity
if (access == BackgroundAccessStatus.Denied)
{
// Either the user has explicitly denied background execution for this app
// or the maximum number of background apps across the system has been reached
// Display some informative message to the user...
}
}

22. New in Windows Phone 8.1
Sort and manage which apps can
execute in the background
Controls number of apps that can
run in the background

23. BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
taskBuilder.Name = "MyBackgroundTask";
// Many different trigger types could be used here
SystemTrigger trigger = new SystemTrigger(SystemTriggerType.TimeZoneChange, false);
taskBuilder.SetTrigger(trigger);
taskBuilder.AddCondition(new SystemCondition(SystemConditionType.InternetAvailable));
// Entry point is the full name of our IBackgroundTask implementation
// Good practice to use reflection as here to ensure correct name
taskBuilder.TaskEntryPoint = typeof(MyBackgroundTask.TheTask).FullName;
BackgroundTaskRegistration registration = taskBuilder.Register();
// Optionally, handle the progress/completed events of the task
registration.Progress += registration_Progress;
registration.Completed += registration_Completed;

24. // AllTasks is a dictionary <Guid, IBackgroundTaskRegistration> so you can get back
// to your registration by id or by posiiton, or select First if you only have one registration.
var taskRegistration = BackgroundTaskRegistration.AllTasks.Values.FirstOrDefault();
// We could then unregister the task, optionally cancelling any running instance
if (taskRegistration != null)
{
taskRegistration.Unregister(true);
}
// Release the progress/completed event subscriptions
registration.Progress -= registration_Progress;
registration.Completed -= registration_Completed;

28. 123
4
<?xml version=“1.0”>
Type = raw, Data = Man City....
</xml>

31. Quotas are based on actual CPU usage instead of wall clock time limits only. On Windows Phone, CPU
usage quota is 2 seconds per app, refreshed every 15 minutes.
Wall-clock CPU quota will also be enforced (at least 30 secs)
Memory quota scales based on device capabilities
TimeTrigger will have a 30 min floor on Phone

32. Background task
type
512 MB 1 GB 2 GB or greater
Location 16 30 40
Bluetooth 16 16 16
Servicing Complete 10 10 10
Other background
tasks
16 30 40
Limit while debugging 30 40 50

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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. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.