/// <inheritdoc/>
public Task<Position> GetPositionAsync (int timeout = Timeout.Infinite, CancellationToken? cancelToken = null, bool includeHeading = false)
{
if (!CheckPermission("android.permission.ACCESS_COARSE_LOCATION"))
{
Console.WriteLine("Unable to get location, ACCESS_COARSE_LOCATION not set.");
return null;
}
if (!CheckPermission("android.permission.ACCESS_FINE_LOCATION"))
{
Console.WriteLine("Unable to get location, ACCESS_FINE_LOCATION not set.");
return null;
}
if (timeout <= 0 && timeout != Timeout.Infinite)
throw new ArgumentOutOfRangeException ("timeout", "timeout must be greater than or equal to 0");
if (!cancelToken.HasValue)
cancelToken = CancellationToken.None;
var tcs = new TaskCompletionSource<Position>();
if (!IsListening)
{
GeolocationSingleListener singleListener = null;
singleListener = new GeolocationSingleListener ((float)DesiredAccuracy, timeout, this.providers.Where (this.manager.IsProviderEnabled),
finishedCallback: () =>
{
for (int i = 0; i < this.providers.Length; ++i)
this.manager.RemoveUpdates (singleListener);
});
if (cancelToken != CancellationToken.None)
{
cancelToken.Value.Register (() =>
{
singleListener.Cancel();
for (int i = 0; i < this.providers.Length; ++i)
this.manager.RemoveUpdates (singleListener);
}, true);
}
try
{
Looper looper = Looper.MyLooper() ?? Looper.MainLooper;
int enabled = 0;
for (int i = 0; i < this.providers.Length; ++i)
{
if (this.manager.IsProviderEnabled (this.providers[i]))
enabled++;
this.manager.RequestLocationUpdates (this.providers[i], 0, 0, singleListener, looper);
}
if (enabled == 0)
{
for (int i = 0; i < this.providers.Length; ++i)
this.manager.RemoveUpdates (singleListener);
tcs.SetException (new GeolocationException (GeolocationError.PositionUnavailable));
return tcs.Task;
}
}
catch (Java.Lang.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 (this.positionSync)
{
if (this.lastPosition == null)
{
if (cancelToken != CancellationToken.None)
{
cancelToken.Value.Register (() => tcs.TrySetCanceled());
}
EventHandler<PositionEventArgs> gotPosition = null;
gotPosition = (s, e) =>
{
tcs.TrySetResult (e.Position);
PositionChanged -= gotPosition;
};
PositionChanged += gotPosition;
}
else
{
tcs.SetResult (this.lastPosition);
}
}
return tcs.Task;
}
/// <inheritdoc/>
public Task <Position> GetPositionAsync(int timeoutMilliseconds = Timeout.Infinite, CancellationToken?cancelToken = null, bool includeHeading = false)
{
if (!CheckPermission("android.permission.ACCESS_COARSE_LOCATION"))
{
Console.WriteLine("Unable to get location, ACCESS_COARSE_LOCATION not set.");
return(null);
}
if (!CheckPermission("android.permission.ACCESS_FINE_LOCATION"))
{
Console.WriteLine("Unable to get location, ACCESS_FINE_LOCATION not set.");
return(null);
}
if (timeoutMilliseconds <= 0 && timeoutMilliseconds != Timeout.Infinite)
{
throw new ArgumentOutOfRangeException("timeoutMilliseconds", "timeout must be greater than or equal to 0");
}
if (!cancelToken.HasValue)
{
cancelToken = CancellationToken.None;
}
var tcs = new TaskCompletionSource <Position>();
if (!IsListening)
{
GeolocationSingleListener singleListener = null;
singleListener = new GeolocationSingleListener((float)DesiredAccuracy, timeoutMilliseconds, this.providers.Where(this.manager.IsProviderEnabled),
finishedCallback: () =>
{
for (int i = 0; i < this.providers.Length; ++i)
{
this.manager.RemoveUpdates(singleListener);
}
});
if (cancelToken != CancellationToken.None)
{
cancelToken.Value.Register(() =>
{
singleListener.Cancel();
for (int i = 0; i < this.providers.Length; ++i)
{
this.manager.RemoveUpdates(singleListener);
}
}, true);
}
try
{
Looper looper = Looper.MyLooper() ?? Looper.MainLooper;
int enabled = 0;
for (int i = 0; i < this.providers.Length; ++i)
{
if (this.manager.IsProviderEnabled(this.providers[i]))
{
enabled++;
}
this.manager.RequestLocationUpdates(this.providers[i], 0, 0, singleListener, looper);
}
if (enabled == 0)
{
for (int i = 0; i < this.providers.Length; ++i)
{
this.manager.RemoveUpdates(singleListener);
}
tcs.SetException(new GeolocationException(GeolocationError.PositionUnavailable));
return(tcs.Task);
}
}
catch (Java.Lang.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 (this.positionSync)
{
if (this.lastPosition == null)
{
if (cancelToken != CancellationToken.None)
{
cancelToken.Value.Register(() => tcs.TrySetCanceled());
}
EventHandler <PositionEventArgs> gotPosition = null;
gotPosition = (s, e) =>
{
tcs.TrySetResult(e.Position);
PositionChanged -= gotPosition;
};
PositionChanged += gotPosition;
}
else
{
tcs.SetResult(this.lastPosition);
}
}
return(tcs.Task);
}
