trying to get the most accurate device location from GPS or Network in Android
- by arc
I am trying to determine the most accurate location of a device, in the shortest time possible.
I am storing the data as a geopoint, and have it displayed on a mapview.
The last time I activated the GPS on my device and let it get a location lock, i was approx 80 miles from where I am now.
I have a location manager setup and a location listener.
If I do this, I get NULL.
myLocOverlay = new MyLocationOverlay(this, mapView);
GeoPoint test = myLocOverlay.getMyLocation();
but in the next couple of lines;
myLocOverlay.enableMyLocation();
mapView.getOverlays().add(myLocOverlay);
With this, the overlay on the map shows the current location. It is using the Network provider, but is also attempting to get a GPS fix (it can't as I am indoors and no where near the top floor).
If I construct the geopoint like this;
if(lm.getLastKnownLocation("gps") != null)
{
test = new GeoPoint(
(int) (lm.getLastKnownLocation("gps").getLatitude() * 1E6),
(int) (lm.getLastKnownLocation("gps").getLongitude() * 1E6));
}
else
{
if(lm.getLastKnownLocation("network") != null)
{
test = new GeoPoint(
(int) (lm.getLastKnownLocation("network").getLatitude() * 1E6),
(int) (lm.getLastKnownLocation("network").getLongitude() * 1E6));
}
//bad things
}
Then I get confusing results. If I disable the devices GPS provider then the code moves onto the Network Provider and gives me a fairly accurate result. If I enable the GPS provider, then the geopoint comes back as the last place I allowed the device to get a GPS lock.
I want to avoid the above results, and so was looking at using;
GeoPoint test = myLocOverlay.getMyLocation();
BUT as I said above, I just get NULL from that.
Short of getting the geopoints from both GPS and Network and then comparing them, and disregarding the GPS result if it is say 1 mile out of the Network location - i'm a bit stuck. why doesn't getMyLocation() work, shouldnt that return the GeoPoint of what myLocOverlay is showing on the mapview?
