public Task <Position> GetPositionAsync(int timeout, CancellationToken cancelToken, bool includeHeading)
{
if (timeout <= 0 && timeout != Timeout.Infinite)
{
throw new ArgumentOutOfRangeException("timeout", "timeout must be greater than or equal to 0");
}
var tcs = new TaskCompletionSource <Position>();
if (!IsListening)
{
GeolocationSingleListener singleListener = null;
singleListener = new GeolocationSingleListener((float)DesiredAccuracy, timeout,
providers.Where(manager.IsProviderEnabled), () =>
{
for (int i = 0; i < providers.Length; ++i)
{
manager.RemoveUpdates(singleListener);
}
});
if (cancelToken != CancellationToken.None)
{
cancelToken.Register(() =>
{
singleListener.Cancel();
for (int i = 0; i < providers.Length; ++i)
{
manager.RemoveUpdates(singleListener);
}
}, true);
}
try
{
Looper looper = Looper.MyLooper() ?? Looper.MainLooper;
int enabled = 0;
for (int i = 0; i < providers.Length; ++i)
{
if (manager.IsProviderEnabled(providers[i]))
{
enabled++;
}
manager.RequestLocationUpdates(providers[i], 0, 0, singleListener, looper);
}
if (enabled == 0)
{
for (int i = 0; i < providers.Length; ++i)
{
manager.RemoveUpdates(singleListener);
}
tcs.SetException(new GeolocationException(GeolocationError.PositionUnavailable));
return(tcs.Task);
}
}
catch (SecurityException ex)
{
tcs.SetException(new GeolocationException(GeolocationError.Unauthorized, ex));
return(tcs.Task);
}
return(singleListener.Task);
}
// If we're already listening, just use the current listener
lock (positionSync)
{
if (lastPosition == null)
{
if (cancelToken != CancellationToken.None)
{
cancelToken.Register(() => tcs.TrySetCanceled());
}
EventHandler <PositionEventArgs> gotPosition = null;
gotPosition = (s, e) =>
{
tcs.TrySetResult(e.Position);
PositionChanged -= gotPosition;
};
PositionChanged += gotPosition;
}
else
{
tcs.SetResult(lastPosition);
}
}
return(tcs.Task);
}
public Task<Position> GetPositionAsync(int timeout, CancellationToken cancelToken, bool includeHeading)
{
if (timeout <= 0 && timeout != Timeout.Infinite)
throw new ArgumentOutOfRangeException("timeout", "timeout must be greater than or equal to 0");
var tcs = new TaskCompletionSource<Position>();
if (!IsListening)
{
GeolocationSingleListener singleListener = null;
singleListener = new GeolocationSingleListener((float) DesiredAccuracy, timeout,
providers.Where(manager.IsProviderEnabled), () =>
{
for (int i = 0; i < providers.Length; ++i)
manager.RemoveUpdates(singleListener);
});
if (cancelToken != CancellationToken.None)
{
cancelToken.Register(() =>
{
singleListener.Cancel();
for (int i = 0; i < providers.Length; ++i)
manager.RemoveUpdates(singleListener);
}, true);
}
try
{
Looper looper = Looper.MyLooper() ?? Looper.MainLooper;
int enabled = 0;
for (int i = 0; i < providers.Length; ++i)
{
if (manager.IsProviderEnabled(providers[i]))
enabled++;
manager.RequestLocationUpdates(providers[i], 0, 0, singleListener, looper);
}
if (enabled == 0)
{
for (int i = 0; i < providers.Length; ++i)
manager.RemoveUpdates(singleListener);
tcs.SetException(new GeolocationException(GeolocationError.PositionUnavailable));
return tcs.Task;
}
}
catch (SecurityException ex)
{
tcs.SetException(new GeolocationException(GeolocationError.Unauthorized, ex));
return tcs.Task;
}
return singleListener.Task;
}
// If we're already listening, just use the current listener
lock (positionSync)
{
if (lastPosition == null)
{
if (cancelToken != CancellationToken.None)
{
cancelToken.Register(() => tcs.TrySetCanceled());
}
EventHandler<PositionEventArgs> gotPosition = null;
gotPosition = (s, e) =>
{
tcs.TrySetResult(e.Position);
PositionChanged -= gotPosition;
};
PositionChanged += gotPosition;
}
else
{
tcs.SetResult(lastPosition);
}
}
return tcs.Task;
}
