Question

我正在开发一个基于GPS服务的应用程序，我必须连续跟踪用户的位置，例如HERE Maps。

geolocator = new Geolocator();
geolocator.DesiredAccuracy = PositionAccuracy.High;
geolocator.MovementThreshold = 20; //Doesn't matter the value I put here, it won't work
geolocator.PositionChanged += geolocator_PositionChanged;

void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
{
    Dispatcher.BeginInvoke(() =>
    {
        if(args.Position != null)
        {
             myPosition = args.Position.Coordinate.ToGeoCoordinate();
             UpDateData();
        }
     });
}

（我曾尝试使用GeoCoordinateWatcher，但我什么也没得到）。当我站在同一个地方或移动得非常慢时，这些功能可以很好地工作，但是如果我进入汽车并在几秒钟后开始驱动应用程序崩溃，我不知道为什么。我搜索了大量具有相同终结性的代码，但所有代码都不起作用。你知道这个问题的其他任何解决方案，还是已经发现你和我的问题一样？

Answer 1

try
    {
        geolocator = new Geolocator();
        geolocator.DesiredAccuracy = PositionAccuracy.High;
        geolocator.ReportInterval = 2000;
        geolocator.PositionChanged += geolocator_PositionChanged;
    }
    catch (UnauthorizedAccessException)
    {
        MessageBox.Show("Location  is Disabled in Phone Settings.");
    }

    private void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
    {
    try
    {
        Dispatcher.BeginInvoke(() =>
        {
            if (args.Position != null && args.Position.Coordinate.ToGeoCoordinate() != myPosition)
            {
                if(args.Position.Coordinate.Accuracy <= 1500)
                {
                    myPosition = args.Position.Coordinate.ToGeoCoordinate();
                    UpDateMyPositionCircle(args.Position.Coordinate.Accuracy);
                }
            }
        });
    } 
    catch (TargetInvocationException tie) 
    {
        if (tie.Data == null) throw;
        else MessageBox.Show("TargetInvocationException while Tracking: " + tie.InnerException.ToString());                    
    }
    catch(SystemException se)
    {
        if (se.Data == null) throw;
        else MessageBox.Show("SystemException while Tracking: " + se.InnerException.ToString());
    }
    catch(Exception ex)
    {
        if (ex.Data == null) throw;
        else MessageBox.Show("Exception while Tracking: " + ex.InnerException.ToString());
    }
}

持续跟踪Windows Phone 8的位置

1 个答案: