Windows Phone 8.1背景位置跟蹤

Question

我需要在Windows Phone 8.1上執行一個應用程序，該應用程序在后台任務中每15分鍾更新一次我的位置。

即使用戶不在場，該任務也必須工作。 我怎樣才能做到這一點 ？

我剛剛創建了BackgroundTask ， TimeTrigger注冊了它，但是它不起作用。

這是我的注冊方法：

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();

這是我的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

我假設您輸入的值15出現異常。

但是，在Windows Phone 8.1中，時間觸發時間最少為30分鍾，Windows存儲應用程序最少為15分鍾。