System.Device.Location.GeoCoordinateWatcher.Position.Location.Speed always is NaN
Category: visual studio graphics tools
Question
Vladyslav Koshyl on Fri, 19 Feb 2016 23:08:11
Hi all! I'm making a simple app for my WP8.1 device, which will be track my maximum speed. I'm using System.Device.Location.GeoCoordinateWatcher for this. I can detect my position, but speed always is NaN. And I don't understand, why. What is wrong? Thanks for any help or info. It is my full code below:
namespace SpeedTracker{
public partial class MainPage : PhoneApplicationPage
{
GeoCoordinateWatcher watcher;
double maxSpeed = 0.0;
public MainPage()
{
InitializeComponent();
}
private void StartTrackingBtn_Click(object sender, RoutedEventArgs e)
{
this.watcher = new GeoCoordinateWatcher(GeoPositionAccuracy.Default);
this.watcher.MovementThreshold = 10;
this.watcher.StatusChanged += new EventHandler<GeoPositionStatusChangedEventArgs>(watcher_StatusChanged);
this.watcher.PositionChanged += new EventHandler<GeoPositionChangedEventArgs<GeoCoordinate>>(watcher_PositionChanged);
this.watcher.Start();
}
private void StopTrackingBtn_Click(object sender, RoutedEventArgs e)
{
this.watcher.StatusChanged -= new EventHandler<GeoPositionStatusChangedEventArgs>(watcher_StatusChanged);
this.watcher.PositionChanged -= new EventHandler<GeoPositionChangedEventArgs<GeoCoordinate>>(watcher_PositionChanged);
this.watcher.Stop();
}
private void watcher_PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
{
if (this.watcher.Position.Location.IsUnknown != true)
{
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
this.maxSpeed = Math.Max(this.maxSpeed, e.Position.Location.Speed);
this.SpeedValueTxblck.Text = this.maxSpeed.ToString();
});
}
else
{
this.SpeedValueTxblck.Text = "Please wait while your prosition is determined...";
}
}
private void watcher_StatusChanged(object sender, GeoPositionStatusChangedEventArgs e)
{
switch (e.Status)
{
case GeoPositionStatus.Disabled:
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
this.SpeedValueTxblck.Text = "Location Service is not enabled on the device";
});
break;
case GeoPositionStatus.NoData:
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
this.SpeedValueTxblck.Text = "The Location Service is working, but it cannot get location data";
});
break;
default:
break;
}
}
private void GetLocationCourseAndSpeed()
{
this.watcher.TryStart(true, TimeSpan.FromMilliseconds(1000));
if (watcher.Position.Location.IsUnknown != true)
{
GeoCoordinate coord = watcher.Position.Location;
this.maxSpeed = Math.Max(this.maxSpeed, coord.Speed);
this.SpeedValueTxblck.Text = this.maxSpeed.ToString();
}
else
{
this.SpeedValueTxblck.Text = "Unknown";
}
}
}
}
Replies
SeanMcDev on Wed, 18 May 2016 22:20:19
Wrong forum.