void StartLocationUpdates()
{
if (locationUpdatesStarted)
{
return;
}
else
{
locationUpdatesStarted = true;
}
if (indoorManager != null)
{
Log.Debug("app", "indoorManager already initialized, starting position updates");
indoorManager.StartPositioning();
return;
}
// starting with Android 8.0, the most reliable way to keep
// Bluetooth scanning active when the user leaves the app is through
// a foreground service, and for that to work we're required to show
// a notification that informs the user about the activity
//
// read more about it on:
// https://developer.android.com/guide/components/services.html#Foreground
var channelId = "indoor_location";
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
// Android 8.0 and up require a channel for the notifications
var channel = new NotificationChannel(channelId, "Bluetooth activity", NotificationImportance.Low);
var notificationManager = this.GetSystemService(Context.NotificationService) as NotificationManager;
notificationManager.CreateNotificationChannel(channel);
}
var notification = new NotificationCompat.Builder(this, channelId)
.SetSmallIcon(global::Android.Resource.Drawable.IcDialogInfo)
.SetContentTitle("Indoor Location")
.SetContentText("Indoor Location updates are running")
.Build();
var creds = new EstimoteCloudCredentials(APP_ID, APP_TOKEN);
var getLocationHandler = new GetLocationHandler();
getLocationHandler.GetLocationSuccess += (location) =>
{
Log.Debug("app", $"Successfully fetched location from Estimote Cloud: {location}");
Log.Debug("app", "Initializing indoorManager and starting position updates");
locationView.SetLocation(location);
indoorManager = new IndoorLocationManagerBuilder(this, location, creds)
// see the longer comment above about the foreground service and
// the notification
//
// if you only intend to use beacons while the app is open, you
// can safely remove this line
.WithScannerInForegroundService(notification)
.Build();
indoorManager.SetOnPositionUpdateListener(new PositionUpdateHandler(locationView));
indoorManager.StartPositioning();
};
getLocationHandler.GetLocationFailure += (error) =>
{
Log.Error("app", $"Failed to fetch the location from Estimote Cloud: {error}");
};
Log.Debug("app", $"Fetching location '{LOCATION_ID}' from Estimote Cloud...");
new IndoorCloudManagerFactory()
.Create(this, creds)
.GetLocation(LOCATION_ID, getLocationHandler);
}
protected override async Task StartListeningAsync()
{
await base.StartListeningAsync();
Notification notification = (SensusContext.Current.Notifier as AndroidNotifier).CreateNotificationBuilder(AndroidNotifier.SensusNotificationChannel.ForegroundService)
.SetSmallIcon(Resource.Drawable.notification_icon_background)
.SetContentTitle("Beacon Scan")
.SetContentText("Scanning...")
.SetOngoing(true)
.Build();
if (Beacons.Count > 0)
{
_proximityObserver = new ProximityObserverBuilder(Application.Context, new Estimote.Android.Proximity.EstimoteCloudCredentials(EstimoteCloudAppId, EstimoteCloudAppToken))
.WithBalancedPowerMode()
.WithScannerInForegroundService(notification)
.OnError(new ProximityErrorHandler())
.Build();
List <IProximityZone> zones = new List <IProximityZone>();
foreach (EstimoteBeacon beacon in Beacons)
{
IProximityZone zone = new ProximityZoneBuilder()
.ForTag(beacon.Tag)
.InCustomRange(beacon.ProximityMeters)
.OnEnter(new ProximityHandler(this, beacon, EstimoteBeaconProximityEvent.Entered))
.OnExit(new ProximityHandler(this, beacon, EstimoteBeaconProximityEvent.Exited))
.Build();
zones.Add(zone);
}
_proximityObservationHandler = _proximityObserver.StartObserving(zones);
}
if (Location != null)
{
Estimote.Android.Indoor.EstimoteCloudCredentials credentials = new Estimote.Android.Indoor.EstimoteCloudCredentials(EstimoteCloudAppId, EstimoteCloudAppToken);
IIndoorCloudManager indoorCloudManager = new IndoorCloudManagerFactory().Create(Application.Context, credentials);
AndroidEstimoteIndoorCloudCallback cloudCallback = new AndroidEstimoteIndoorCloudCallback();
indoorCloudManager.GetLocation(Location.Identifier, cloudCallback);
Estimote.Android.Indoor.Location cloudLocation = await cloudCallback.GetValueAsync();
_indoorLocationManager = new IndoorLocationManagerBuilder(Application.Context, cloudLocation, credentials)
.WithPositionUpdateInterval(IndoorLocationUpdateIntervalMS)
.WithOnErrorAction(new IndoorErrorHandler())
.WithScannerInForegroundService(notification)
.Build();
AndroidEstimoteIndoorPositionUpdateListener indoorPositionUpdateListener = new AndroidEstimoteIndoorPositionUpdateListener();
indoorPositionUpdateListener.UpdatedPositionAsync += async(estimoteLocation) =>
{
EstimoteIndoorLocationDatum datum = null;
if (estimoteLocation != null)
{
datum = new EstimoteIndoorLocationDatum(DateTimeOffset.UtcNow, estimoteLocation.GetX(), estimoteLocation.GetY(), estimoteLocation.Orientation, EstimoteIndoorLocationAccuracy.Unknown, Location.Name, Location.Identifier, cloudLocation, estimoteLocation);
}
await StoreDatumAsync(datum);
};
_indoorLocationManager.SetOnPositionUpdateListener(indoorPositionUpdateListener);
_indoorLocationManager.StartPositioning();
}
}
