我需要在Windows Phone 8.1上创建一个应用程序,在后台任务中每15分钟更新一次我的位置。
即使用户在场,任务也必须有效。 我怎么能这样做?
我刚刚创建了一个BackgroundTask
,我用TimeTrigger
注册了它,但它不起作用。
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
}
}
}
}
答案 0 :(得分:1)
我假设您输入的值为15时会出现异常。
然而,在Windows Phone 8.1中,时间触发最少30分钟,Windows应用程序应用最少为15分钟。