私のアプリの一部のユーザーは、追跡側が機能しないと不満を漏らしています。アプリがGeoCoordinateWatcherを起動し、現在の場所を取得しようとしている間、画面の上部にGPSアイコンが点滅します。これが完了して問題がなければ、アイコンの点滅が止まり、準備完了というメッセージが表示されます。ユーザーはこれが発生すると報告していますが、速度などの画面上の項目は更新されません. アプリが追跡した場所を保存すると、そこには何もありません。
追跡部分のコードは次のとおりです。ページ読み込みイベントでは、次を呼び出します
/// <summary>
/// Starts tracking the user
/// </summary>
private void StartTracking()
{
var app = (Application.Current as App);
// check to see if tracking is enabled by the user
if (app.LocationTrackingIsEnabled)
{
(new Thread(() =>
{
// Create the GeoWatcher
var watcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High) { MovementThreshold = 1 };
// Check to see if we have permission to use the location services of the phone
if (watcher.Permission == GeoPositionPermission.Granted)
{
watcher.StatusChanged += new EventHandler<GeoPositionStatusChangedEventArgs>(watcher_StatusChanged);
var status = Observable.FromEvent<GeoPositionStatusChangedEventArgs>(watcher, "StatusChanged");
var readys = status.Where(o => o.EventArgs.Status == GeoPositionStatus.Ready);
var notReadys = status.Where(o => o.EventArgs.Status != GeoPositionStatus.Ready);
var readyPos = from r in readys
from i in Observable.Interval(TimeSpan.FromSeconds(LocationTrackInterval))
.TakeUntil(notReadys)
where (DateTime.Now - watcher.Position.Timestamp.DateTime) < TimeSpan.FromSeconds(12)
select watcher.Position;
LocationSubscribe = readyPos.Subscribe(loc =>
{
if (!HasPaused)
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
// Get current speed (meters per second);
if (!double.IsNaN(loc.Location.Speed))
app.CurrentPos.CurrentSpeed = Math.Round(loc.Location.Speed, 2);
else
app.CurrentPos.CurrentSpeed = 0;
// Calculate distance
if (RunLocations.Count > 0)
app.CurrentPos.DistanceMeters += Math.Round(new GeoCoordinate(RunLocations[RunLocations.Count - 1].Latitude,
GPSLocations[GPSLocations.Count - 1].Longitude).GetDistanceTo(loc.Location), 2);
// Add Location
GPSLocations.Add(new GPSLocation()
{
Latitude = loc.Location.Latitude,
Longitude = loc.Location.Longitude,
Altitude = loc.Location.Altitude,
Speed = app.CurrentRun.CurrentSpeed
});
// Get the average speed
app.CurrentPos.AverageSpeed = Math.Round((from r in GPSLocations
select r.Speed).Average(), 2);
// Set last position for use later
Lastlocation = loc.Location;
}));
}
});
// Try and start the watcher
if (!watcher.TryStart(false, TimeSpan.FromSeconds(5)))
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
MessageBox.Show("There was an error trying to get your location. Tracking is not possible.");
}));
}
}
else
{
sbGpsFlash.Stop(); // stop the flashing gps symbol
gpsStatus.Text = "Denied";
}
})).Start();
}
else
{
sbGpsFlash.Stop(); // stop the flashing gps symbol
gpsStatus.Text = "Disabled";
}
}
void watcher_StatusChanged(object sender, GeoPositionStatusChangedEventArgs e)
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
gpsStatus.Text = e.Status.ToString();
switch (e.Status)
{
case GeoPositionStatus.Initializing:
gpsStatus.Text = "Locating...";
break;
case GeoPositionStatus.Disabled:
gpsStatus.Text = "Disabled";
break;
case GeoPositionStatus.NoData:
gpsStatus.Text = "No Data";
break;
case GeoPositionStatus.Ready:
gpsStatus.Text = "Ready";
break;
}
sbGpsFlash.Stop();
}));
}
問題を引き起こす可能性のあるコードの問題を誰でも見ることができますか?