/// <summary>
/// Requests a single GPS reading by starting the listener and stopping once a reading is received
/// Requests a single GPS reading - This will start & stop the gps listener if wasn't running already
/// </summary>
/// <param name="gpsManager"></param>
/// <returns></returns>
public static IObservable <IGpsReading> GetCurrentPosition(this IGpsManager gpsManager) => Observable.FromAsync(async ct =>
{
var iStarted = false;
try
{
await currentLocSemaphore
.WaitAsync(ct)
.ConfigureAwait(false);
var task = gpsManager
.WhenReading()
.Take(1)
.ToTask(ct);
if (!gpsManager.IsListening())
{
iStarted = true;
await gpsManager
.StartListener(GpsRequest.Foreground)
.ConfigureAwait(false);
}
var reading = await task.ConfigureAwait(false);
return(reading);
}
finally
{
currentLocSemaphore.Release();
if (iStarted)
{
await gpsManager.StopListener().ConfigureAwait(false);
}
}
});
/// <summary>
/// This method will start the GPS with realtime and close on disposable (or when the app backgrounds)
/// </summary>
/// <param name="gpsManager"></param>
/// <returns></returns>
public static IObservable <IGpsReading> StartAndReceive(this IGpsManager gpsManager) => Observable.Create <IGpsReading>(ob =>
{
var composite = new CompositeDisposable();
var platform = ShinyHost.Resolve <IPlatform>();
gpsManager
.WhenReading()
.Subscribe(
ob.OnNext,
ob.OnError
)
.DisposedBy(composite);
platform
.WhenStateChanged()
.Where(x => x == PlatformState.Background)
.Subscribe(_ => ob.Respond(null))
.DisposedBy(composite);
gpsManager
.StartListener(GpsRequest.Foreground)
.ContinueWith(x =>
{
if (x.IsFaulted)
{
ob.OnError(x.Exception);
}
});
return(() =>
{
composite.Dispose();
gpsManager.StopListener();
});
});
public async Task Run(CancellationToken token)
{
if (_gpsManager.IsListening)
{
return;
}
#region Subscribe GPS reading event
//購読重複を避けるために購読を解除する
_gpsObserver?.Dispose();
//位置情報取得イベントを購読
_gpsObserver = _gpsManager
.WhenReading()
.Subscribe(async x =>
{
if (token.IsCancellationRequested)
{
await _gpsManager.StopListener();
_gpsObserver?.Dispose();
return;
}
MainThread.BeginInvokeOnMainThread(() => {
var message = new LocationReadMessage
{
GpsInfo = x,
};
MessagingCenter.Send(message, nameof(LocationReadMessage));
});
await _notificationManager.ScheduleNotification($"{x.Position.Latitude}, {x.Position.Longitude}", "test");
});
#endregion
#region GPS start listen.
//位置情報取得許可を得る
var checkResult = await Permissions.CheckStatusAsync <Permissions.LocationAlways>();
if (checkResult != PermissionStatus.Granted)
{
var requestResult = await Permissions.RequestAsync <Permissions.LocationAlways>();
if (requestResult != PermissionStatus.Granted)
{
return;
}
}
var request = new GpsRequest
{
Interval = TimeSpan.FromSeconds(5),
UseBackground = false,
};
await _gpsManager.StartListener(request);
#endregion
}
public GpsViewModel(IGpsManager gps)
{
this.Start = ReactiveCommand.CreateFromTask(
async() =>
{
this.foreground = gps
.WhenReading()
.Subscribe(reading =>
{
this.Latitude = reading.Position.Latitude;
this.Longitude = reading.Position.Longitude;
});
await gps.StartListener(GpsRequest.Realtime(true));
}
);
this.Stop = ReactiveCommand.CreateFromTask(async() =>
{
await gps.StopListener();
this.foreground?.Dispose();
});
}
