I am doing a windows 8 App using c#. the app goes to suspend state if its inactive, I am trying to bring the app to front based on external events. So I used a background task with this app which monitors the external event. Once the event occurs I am able to send updates to the app but not able to bring it to front. any pointers will be helpful.
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Hai am developing an ios application using Nativescript-angular framework.My app contains local notifications functionality using timer. but I click the home button In my phone the timer was destroyed and notifications not came. Is there anyway to run the timer when my app is in background?
In order show notifications after app is moved to background, you should use BackgroundTask.
If you like to perform any operation even when the app is not running, then you should opt for BackgroundFetch
Is there a way to know if the app is sent to background or brought to foreground. I don't mean Suspended and Resuming events.
For example, user leaves the app to check something on Facebook app for a min. And then return to back to my app. So suspention doesn't take effect on this scenario. Then how to know user is back to the app on app.cs level?
As stated in the MSDN documentation:
Your app doesn't receive an activation event when app visibility changes, because the app is still running. Windows simply switches to and from the app as necessary. If your app needs to do something when the user switches away and back, it can handle the visibilitychange event (for HTML) or Window.VisibilityChanged event (for XAML).
I'm trying to build a script with javascript for automation to prevent certain applications from launching in OSX. In the documentation, there is a NSWorkspaceWillLaunchApplicationNotification notification. How can I listen for this notification, check which application is being launched, and then stop the application from launching?
I'd like to be able to do it programmatically because I'm building an app for people to be able to block timewasting applications while they're working.
I'm developing a windows phone app, suppose my app is running, user click start key, my app will bring to background, then next user long press back key, the task manager will be shown. My question is here: How can update the screenshots of my app when it was brought to background? I don't want expose anything of my app outside even in the task manager, could I do it? Thanks.
How can update the screenshots of my app when it was brought to background?
You cannot. And it's not a task manager, but a "fast app switch", allowing the user to easy swap between applications. The screenshot you see, will be the last screen of your application when it was in the foreground.
And your application will not be running in the background.
No - you cannot change the image shown in the app switching UI. This is built in OS functionality.
Is it possible to create an app the runs in the background? If so is there any samples out there for this?
In Windows Phone OS 7.1 you can actually use Background Agents now to perform tasks in the background.
from MSDN:
Scheduled Tasks and background agents allow an application to execute
code in the background, even when the application is not running in
the foreground. The different types of Scheduled Tasks are designed
for different types of background processing scenarios and therefore
have different behaviors and constraints.
You can use a PeriodicTask or ResourceIntensiveTasks. Read more about it in the MSDN article above.
And here's some sample code for you to integrate background agents into your existing app.
Sample Code: Background Agents in Mango
An application in the foreground can continue to run when the phone screen is locked(not background but...) by setting the PhoneApplicationService.ApplicationIdleDetectionMode property. By setting up your application to run when the phone screen is locked, a user is able to access the application quickly upon unlock. However, when your application runs under a locked screen, it could consume power outside of the user's control. For this reason, your application must minimize power usage when running under a locked screen
At the moment there is no way to create application that runs in background.
True multitasking for 3rd party Windows Phone 7 apps will come as an OS upgrade later this year. However, unless the app has to absolutely run in the background (like Pandora etc.), we as developers share some responsibility in making our apps feel at home with the rest of the OS.
Windows Phone OS offers app developers chances to save state of their applications to give the end users the feeling that it never stopped running; this is essentially the same as in other mobile platforms. As your app is being deactivated/closed, you have the option to "Tombstone" your state so that your users can come back to just where they left with BackStack navigation or future launches. Channel 9 had a nice set of demos & labs around tombstoning, found here.
Hope this helps!