Hi,
What Location mode (in Android Settings) are you using?
To achieve 20m I think you need to have 'High Accuracy' or 'Device Only' so
that the GPS receiver will be used for your Geo fence.
2373 m accuracy indicates you are probably using 'Battery Saving' Location
mode (cell tower & wifi only)
Regards
On Sunday, March 8, 2015 at 9:28:53 AM UTC+11, Tony Pitman wrote:
>
> 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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