This document discusses background tasks in Universal Windows Platform (UWP) apps. It explains that apps are not notified when they are being terminated. It provides code samples for registering background tasks to run on triggers like time or push notifications, and setting conditions like internet availability. It also shows the application manifest configuration for declaring background tasks of different types.

6. Apps do not get notified when
they are getting terminated

7. demo

8. User
Launches
App
Splash
screen

9. //Register for the Suspending event and call suspendingHandler when received
Windows.UI.WebUI.WebUIApplication.addEventListener("suspending", suspendingHandler);
//Handle the suspending event and save the current user session using WinJS sessionState
function suspendingHandler(eventArgs) {
//We are getting suspended
}
//Register for the Resuming event and call resumingHandler when received
Windows.UI.WebUI.WebUIApplication.addEventListener("resuming", resumingHandler);
function resumingHandler() {
//We are getting resumed, in general do nothing
}

11. demo

14. Scenario You should….

15. demo

20. demo

23. Tile launch activation
activated
User taps on Tile Running app
launch event
eventArgs.kind
Splash Screen shown

27. HTTP POST
Notification
Delivered

34. Trigger Condition
TimeTrigger* InternetAvailable,
PushNotificationTrigger* InternetNotAvailable,
SessionStart* SessionConnected,
ControlChannelTrigger*(**) SessionDisconnected,
ServicingComplete UserNotPresent,
SessionConnected UserPresent
SessionDisconnected
SmsReceived
TimeZoneChange
UserAway/UserPresent,
LockScreenApplicationAdded/Removed
OnlineIdConnectedStateChangeInternetAvailable
InternetAvailable/InternetNotAvailable
NetworkNotificationChannelReset
NetworkStateChange
MaintenanceTrigger *requires lock permission
PushNotificationTrigger** **can run in App (not BackgroundHost.exe)

35. function RegisterSampleBackgroundTaskWithCondition()
{
var builder = new Windows.ApplicationModel.Background.BackgroundTaskBuilder();
builder.name = "BackgroundTestWorker";
builder.taskEntryPoint = "BackgroundTestWorker.js";
// run a timetrigger for every 15 minutes
var myTrigger = new Windows.ApplicationModel.Background.TimeTrigger(15, true);
builder.setTrigger(myTrigger);
// required condition: internetAvailable
var condition = new
Windows.ApplicationModel.Background.SystemCondition(Windows.ApplicationModel.Background.Sys
temConditionType.internetAvailable);
builder.addCondition(condition);
// register the task
var task = myTaskBuilder.register();
task.addEventListener("progress", task_Progress);
task.addEventListener("completed", task_Completed);
}

36. <Application Id="App" StartPage="default.html">
<VisualElements DisplayName="SimpleBackgroundTask" Logo="imageslogo.png" SmallLogo="imagessmalllogo.png"
Description="SimpleBackgroundTask" ForegroundText="light" BackgroundColor="#000000">
<LockScreen Notification="badge" BadgeLogo="badgelogo.png" />
<SplashScreen Image="imagessplashscreen.png" />
</VisualElements>
<Extensions>
<Extension Category="windows.backgroundTasks" StartPage="backgroundTaskLogger.js">
<BackgroundTasks>
<Task Type="timer" />
<Task Type="systemEvent" />
</BackgroundTasks>
</Extension>
</Extensions>
</Application>

37. demo

39. CPU resource quota Refresh period
Lock screen app
Non-lock screen app