This document provides information about building apps for Windows Phone 8.1 including background tasks. It discusses different types of triggers that can launch background tasks such as time triggers and location triggers. It also describes conditions that can apply to tasks and limitations on CPU and memory usage for background tasks depending on the device. The document contains examples of how to register a background task using a BackgroundTaskBuilder and notes that the BackgroundExecutionManager must be used to request access before registering tasks on Windows Phone.

1. Windows XAML+
Silverlight 8.1
Building Apps for Windows Phone 8.1 Jump Start
24 апреля 2014

4. PeriodicTask, ResourceIntensiveTask

10. Триггер Инфо
System Trigger Запускается при определенном событии
События: UserPresent/Away, NetworkStateChange, InternetAvailable,
SessionConnected, ServicingComplete, TimeZoneChange
Также: LockScreenApplicationAdded и LockScreenApplicationRemoved
недоступны для Windows Phone
TimeTrigger Запускается периодически (минимальный интервал - 30 мин)
LocationTrigger Запускается при изменении местоположения
MaintenanceTrigger Запускается периодически (минимальный интервал - 30 мин), но
только если устройство работает на зарядке
PushNotificationTrigger Запускается при получении raw push notification

11. Триггер Инфо
RfcommConnectionTrigger Bluetooth: когда установлено RFCOMM соединение
DeviceChangeTrigger Bluetooth: когда установлено/закрыто ACL соединение
BluetoothSignalStrengthTrigger Bluetooth: когда изменяются параметры сигнала
GattCharacteristicNotificationTrigger Bluetooth: когда получены изменения от Bluetooth LE устройства

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

15. 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...
}
}

16. Появился в Windows Phone 8.1
Управляет списком приложений,
которые работают в фоне:
текущий статус, нагрузка на
батарею

17. 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;

18. // 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;

22. 3 2 1
4
<?xml version=“1.0”>
Type = raw, Data = Man City....
</xml>

25. Ограничения основаны на текущем использовании ЦПУ. В Windows Phone: ограничение ЦПУ - 2
секунды на приложение, обновляется каждые 15 минут
Ограничения на память зависят от параметров устройства

26. Тип задачи 512 МБ 1 ГБ 2 ГБ и более
Местоположение 16 30 40
Bluetooth 16 16 16
Сервисные задачи 10 10 10
Другие 16 30 40
В режиме отладки 30 40 50

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