后台地理围栏Windows Phone 8.1（WinRT）

问题

我试图在WP8.1（WinRT）发生地理栅栏事件（进入/退出）时触发BackgroundTask。 我已经写了一个示例应用程序，试图让它工作，但似乎无法做到这一点。

到目前为止，这些是我为了让Geofences在后台工作而采取的步骤：

1. 检查位置function
2. 创build+注册地理围栏
3. 创build+注册一个BackgroundTask，用于侦听LocationTrigger(LocationTriggerType.Geofence);
4. 在我的后台任务中，触发一个简单的popup通知

事情我已经做了解决

我已经启用了我的app.manifest：

• Toast Capable =>是的
• function：位置，Internet（客户端和服务器）
• 声明：BackgroundTasks（位置）。 EntryPoint = BackgroundTask.GeofenceBackgroundTask

我的后台任务位于一个单独的项目中，名为BackgroundTask 。 它是一个WindowsRT组件，包含一个类GeofenceBackgroundTask 。

示例项目

该项目的代码可以在这个[link] （ https://github.com/kiangtengl/GeofenceSample ）find：

如何testing

1. 在模拟器中运行代码

2. 将位置设置为：纬度= 01.3369，经度= 103.7364

3. 单击注册Geofence + BackgroundTasksbutton

4. 退出应用程序（按主页button）

5. 将当前位置更改为距离您之前设置的位置100米的任何地方。 应该popup一个通知。

项目代码：

检查位置function

  public static async Task GetLocationCapabilities() { try { var geolocator = new Geolocator(); await geolocator.GetGeopositionAsync(); var backgroundAccessStatus = await BackgroundExecutionManager.RequestAccessAsync(); Debug.WriteLine("background access status" + backgroundAccessStatus); } catch (UnauthorizedAccessException e) { Debug.WriteLine(e); } catch (TaskCanceledException e) { Debug.WriteLine(e); } } 

创build地理围栏

  public static void CreateGeofence(BasicGeoposition position, double radius, string id = "default") { // The Geofence is a circular area centered at (latitude, longitude) point, with the // radius in meter. var geocircle = new Geocircle(position, radius); // Sets the events that we want to handle: in this case, the entrace and the exit // from an area of intereset. var mask = MonitoredGeofenceStates.Entered | MonitoredGeofenceStates.Exited; // Specifies for how much time the user must have entered/exited the area before // receiving the notification. var dwellTime = TimeSpan.FromSeconds(1); // Creates the Geofence and adds it to the GeofenceMonitor. var geofence = new Geofence(id, geocircle, mask, false, dwellTime); try { GeofenceMonitor.Current.Geofences.Add(geofence); } catch (Exception e) { Debug.WriteLine(e); // geofence already added to system } } 

注册后台任务

  public static async Task RegisterBackgroundTask() { try { // Create a new background task builder var geofenceTaskBuilder = new BackgroundTaskBuilder() { Name = GeofenceBackgroundTaskName, TaskEntryPoint = "BackgroundTask.GeofenceBackgroundTask" }; // Create a new location trigger var trigger = new LocationTrigger(LocationTriggerType.Geofence); // Associate the location trigger with the background task builder geofenceTaskBuilder.SetTrigger(trigger); var geofenceTask = geofenceTaskBuilder.Register(); // Associate an event handler with the new background task geofenceTask.Completed += (sender, e) => { try { e.CheckResult(); } catch(Exception error) { Debug.WriteLine(error); } }; } catch(Exception e) { // Background task probably exists Debug.WriteLine(e); } } 

BackgroundTask代码来触发吐司

 namespace BackgroundTask { public sealed class GeofenceBackgroundTask : IBackgroundTask { public void Run(IBackgroundTaskInstance taskInstance) { var toastTemplate = ToastTemplateType.ToastText02; var toastXML = ToastNotificationManager.GetTemplateContent(toastTemplate); var textElements = toastXML.GetElementsByTagName("text"); textElements[0].AppendChild(toastXML.CreateTextNode("You have left!")); var toast = new ToastNotification(toastXML); ToastNotificationManager.CreateToastNotifier().Show(toast); } } }