A new affection of Windows Store apps, utilizing accomplishments tasks will not alone advice abstain some challenges from the Windows Store app lifecycle, but they can accumulate your app acknowledging to what’s activity on with the user’s device.
Developing Windows Store apps is a change of clip for a lot of developers. Unless you’ve migrated from the Silverlight, Windows Phone 7 or Windows Phone 8 world, the sandboxed and controlled ambiance ability alarm for a bit of an adjustment. One affection you’ll accept to argue with is the lifecycle of a Windows Store app. In acceptable desktop development, the user controls back an application’s running. He can accept to run one or 20 applications at once, and anniversary appliance continues to accept admission to arrangement assets and the CPU.
In the apple of Windows Store apps, things accept changed. If an app isn’t actively active on the user’s screen, at any accustomed time Windows can append that app in adjustment to advance achievement and bottle arrangement resources.
What does this beggarly for you? This agency that if your app isn’t currently on the screen, you can accept it’s in a abeyant accompaniment and no best running. If your app is assured to do alternating abstracts polling or is absolute time, you’re activity to accept to attending for a workaround. Fortunately, the Windows Runtime (WinRT) includes a accumulating of accomplishments tasks your app can advance to assemble a workflow that will assignment with the new lifecycle.
>What Is a Accomplishments Task?In its simplest form, a accomplishments assignment is a chic that accouterments the IBackgroundTask interface amid in the Windows.ApplicationModel.Background namespace. The IBackgroundTask includes a distinct Run adjustment that passes in an IBackgroundTaskInstance that allows the assignment to collaborate with the accepted run process. Here’s a basal accomplishing of IBackgroundTask:
When registering a accomplishments assignment to execute, it charge be assigned to a distinct activate that’s amenable for free back and how frequently a assignment will be executed. Windows Runtime currently includes bristles altered types of triggers, which are apparent in Table 1. A Ascendancy Approach activate is acclimated for high-availability, real-time apps that advance accessible atrium connections. A Ascendancy Approach activate allows the app to run in a low-power approach until abstracts is accustomed beyond the socket. The Push Notification activate allows an app to acknowledge back a raw notification is accustomed from the Windows Notification Service. The Aliment and Timer triggers are both time-based triggers that blaze at a accustomed time interval. The aberration amid the two is that the Aliment activate will alone blaze if the accessory is acquainted into a ability source, and the Timer activate requires the app to be added to the lock awning to function.
Table 1. Accessible activate types.
The aftermost activate type, Arrangement Accident trigger, is one of the best absorbing and able triggers. A Arrangement Accident activate allows you to annals a accomplishments assignment to a array of predefined arrangement events. For instance, you can annals a accomplishments assignment to run anytime an Internet affiliation becomes available. There are currently 12 accessible arrangement events, which are listed in Table 2.
Table 2. Accessible contest apparent as a Arrangement Accident trigger.
The final allotment of a accomplishments assignment is an alternative accumulating of one or added conditions. There are six altered altitude that can be activated to your accomplishments task:
Using altitude allows you to ensure that your accomplishments assignment is successful, and additionally prevents accidental acceptance of arrangement resources. For instance, application the Internet Accessible action comes in accessible if your accomplishments assignment requires Internet access.
It’s important to accede the aggregate of activate and altitude acclimated back registering a accomplishments task, to abstain creating a action that will anticipate your assignment from anytime running. Combining an Internet Not Accessible action with an Internet Accessible trigger, for instance, will aftereffect in your assignment declining to anytime run.
Background Tasks and the Lock ScreenBefore abacus accomplishments tasks to your Windows Store app, booty into annual the appulse of the lock awning on accomplishments tasks. A user can abode up to seven apps on his lock screen. Already an app is added to the lock screen, it gets a college antecedence over added apps. This college antecedence has a absolute affect on accomplishments tasks. I mentioned beforehand that the app charge be on the lock awning afore the Timer activate would work. In fact, the Ascendancy Approach and Push Notification triggers additionally crave the app to be on the lock screen. Similarly, several of the Arrangement Accident triggers additionally crave the app to be added to the lock screen.
In accession to accepting added triggers available, apps placed on the lock awning get added arrangement assets for their accomplishments tasks. Anniversary accomplishments assignment associated with a lock awning app is accustomed a two-second CPU allocation and can be active every 15 minutes. Apps not on the lock awning alone accept a one-second allocation with a two-hour refresh. Abstracts throughput is scaled based on the boilerplate arrangement acceleration of the device, but lock awning apps are accustomed about six times added throughput than others.
Thus, back designing the workflow for your accomplishments tasks, it’s acute to accede whether the lock awning will comedy an important role. If your app does await on actuality on the lock screen, it’s important to accommodate a workflow that handles back the app isn’t on the lock screen. This could absorb advice the user that assertive appearance will be disabled, or accepting an alternating workflow to apparatus back the app has been removed from the lock screen. Fortunately, there are two arrangement contest that you can attach a accomplishments assignment to in adjustment to administer this: Lock Awning Appliance Added or Lock Awning Appliance Removed.
The absolute implementations of IBackgroundTask charge abide in a WinRT basic library. If included in the app activity itself or a accepted chic library, they won’t auspiciously annals or run. After the band-aid is generated, right-click the Band-aid bulge in the Band-aid Explorer and baddest Add | New Project. In the New Activity Dialog, baddest Windows Runtime basic and appellation the new activity BackgroundTasks.
It’s acutely important to add a advertence to the new activity from your app, because the capital app never absolutely calls the accomplishments assignment directly. A compile-time absurdity won’t be generated after a reference, but your app will blast already the activate is fired. To add the advertence to your app, right-click on the References binder beneath the BackgroundTaskDemo activity in the Solutions Explorer and baddest Add Reference. In the larboard column, beneath Solution, baddest Projects. Check the BackgroundTasks activity and baddest OK.
Now your band-aid should accept a new BackgroundTasks library absolute a distinct class, Class1. Rename Class1 to MyBackgroundTask and apparatus the accomplishments assignment apparent in Listing 1.
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