I wrote an app that uses location services. It creates a geofence around my
house and lets my app know when I come home. I am doing this in a service
in the background so that my app doesn't have to be the active app to
function. I was using the LocationManager api.
I have a Samsung Galaxy Note 2 with Android 4.1 on it.
The app was working perfectly.
I upgrade the phone to Android 4.3 because it just became available.
Now all of a sudden my app started getting notifications that I was outside
of the geofence when I was still inside and not even really moving.
I did some searching and saw a video presentation from the Google IO
conference in 2013. It talked about the new Google Play Services (at the
time new) and all the great stuff they were doing with location.
I decided to switch to that because it seemed like a better way to go. When
I studied the api I found that even the stuff in that video was deprecated
and there was newer stuff. I got excited thinking it would solve my problem
of accuracy.
I just finished implementing my app using the Google Play services
Geofencing. Guess what? I have the same problem.
I put in some logging and basically here is what happens:
I use the Fusion request for location updates to figure out where I am. I
first look for an accuracy of < 10 meters for at least 5 samples. This is
done because my radius is 80 meters, so I have to have a high accuracy when
starting out.
Once I get that I turn OFF the location updates and set up the geofence. I
use the location of my house that was previously gathered from a mapping
piece of my app with a radius of 80 meters. I would like to be able to go
down to 20 meters if I can get it working, but 80 for now.
When I first create the geofence I get 2 notifications right away. The
accuracy on those events is 3.8 meters.
I then let the app sit for about a minute.
At that point I then get 2 more transition events. Both of them say I am
outside of the geofence. The accuracy on these events is 2373 meters.
I can only assume that after a minute the api has switched to a lower
accuracy system for some reason.
I then walked at least 80 meters away from my house and I never got any
more transition events at all.
The question is what do I do about it? My app is even still the active app,
so this is not a background issue. I assume it might even be worse if I was
in the background.
I have requested the highest accuracy.
I have heard people say that the answer to this problem is to leave a
location update request going. Doesn't the defeat the whole purpose of
letting the api take over for us? Shouldn't I be able to say I need high
accuracy geofencing and the api just takes care of it?
Here are some snippets from my code:
public synchronized void buildGoogleApiClient() {
_googleApiClient = new GoogleApiClient.Builder(_context)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
Geofence geofence = new Geofence.Builder()
.setRequestId(door.Id)
.setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
Geofence.GEOFENCE_TRANSITION_EXIT)
.setCircularRegion(door.Latitude, door.Longitude, door.
ActivationDistance)
.setExpirationDuration(Geofence.NEVER_EXPIRE)
.build();
GeofencingRequest geofenceRequest = new GeofencingRequest.Builder()
.addGeofence(geofence)
.setInitialTrigger(door.IsInside ? GeofencingRequest.
INITIAL_TRIGGER_ENTER : GeofencingRequest.INITIAL_TRIGGER_EXIT)
.build();
LocationServices.GeofencingApi.addGeofences(_googleApiClient,
geofenceRequest, pi);
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