Windows Phone 8.1背景位置跟踪

Question

我需要在Windows Phone 8.1上执行一个应用程序，该应用程序在后台任务中每15分钟更新一次我的位置。

即使用户不在场，该任务也必须工作。 我怎样才能做到这一点 ？

我刚刚创建了BackgroundTask ， TimeTrigger注册了它，但是它不起作用。

这是我的注册方法：

var access = await BackgroundExecutionManager.RequestAccessAsync();
BackgroundTaskBuilder builder = new BackgroundTaskBuilder();
IBackgroundTrigger trigger = new TimeTrigger(15, false);
builder.Name = "BackgroundTask";
builder.SetTrigger(trigger);
builder.TaskEntryPoint = typeof(LocationTask).FullName;
BackgroundTaskRegistration register = builder.Register();

这是我的LocationTask ：

public sealed class LocationTask : IBackgroundTask
{
    public async void Run(IBackgroundTaskInstance taskInstance)
    {
        try
        {
            Geolocator geolocator = new Geolocator();
            Geoposition geoposition = await geolocator.GetGeopositionAsync();
            Risorse.lat = Math.Round(geoposition.Coordinate.Point.Position.Latitude, 6);
            Risorse.lon = Math.Round(geoposition.Coordinate.Point.Position.Longitude, 6);
            DrupalBridge db = new DrupalBridge("http://interventi.computerhalley.it", "/rest", Risorse.utente, Risorse.lat.ToString().Replace(',', '.'), Risorse.lon.ToString().Replace(',', '.'));
            db.postCoordinate();
        }
        catch (Exception ex)
        {
            if ((uint)ex.HResult == 0x80004004)
            {
                MessageDialog messaggio = new MessageDialog("GPS disattivato...l'applicazione verrà chiusa...\r\nRiavviarla dopo aver attivato la geolocalizzazione");
                await messaggio.ShowAsync();
                Application.Current.Exit();
                //await Windows.System.Launcher.LaunchUriAsync(new Uri("ms - impostazioni - posizione"));
            }
            else
            {
                MessageDialog messaggio = new MessageDialog("Errore imprevisto\r\nriavviare l'applicazione...");
                await messaggio.ShowAsync();
                Application.Current.Exit();
                // something else happened acquring the location
            }
        }
    }
}

Answer 1

我假设您输入的值15出现异常。

但是，在Windows Phone 8.1中，时间触发时间最少为30分钟，Windows存储应用程序最少为15分钟。