Best location data, regardless of provider?

by Anna PS » Thu, 30 Apr 2009 06:20:00 GMT


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 i there,

Sorry if this has been answered already - I can't find the answer
either here or in Android Developers.

I want to get the user's location, using the best provider - either
GPS or network. If GPS is not updating, then I want to use the network
provider. If the user is outside and GPS is more accurate, then I want
to use GPS.

Does Android have some built-in method to grab the most accurate + up-
to-date location, from whichever provider?

I've got code working to register the LocationManager with every
available provider, but I don't know how to choose the most accurate
one - short of manually comparing the accuracy and age of the location
data given by each provider. (Which could get a bit complex, because
you don't want to discard data that's only a few seconds older, if
it's more accurate, but you do want to discard data that's more than a
few minutes old...)

Surely there's a simple way of doing this?

thanks!
Anna

-------------------------

public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.home);

// Register for location listener
String location_context = Context.LOCATION_SERVICE;
locationmanager = (LocationManager) getSystemService
(location_context);
testProviders();

// Do some stuff

// Now, get the best location from either network or GPS - how?
Location locationGPS =
locationmanager.getLastKnownLocation("gps");
Location locationNetwork = locationmanager.getLastKnownLocation
("network");
// Compare the two...?

}

public void testProviders() {
Log.e(LOG_TAG, "testProviders");
StringBuilder sb = new StringBuilder("Enabled Providers");
List<String> providers = locationmanager.getProviders(true);
for (String provider : providers) {
listener = new LocationListener() {
public void onLocationChanged(Location
location) {
}

public void onProviderDisabled(String provider)
{
}

public void onProviderEnabled(String provider) {
}

public void onStatusChanged(String provider,
int status,
Bundle extras) {
}
};
locationmanager.requestLocationUpdates(provider, 1000,
0,
listener);

sb.append("\n*").append(provider).append(": ");

Location location =
locationmanager.getLastKnownLocation(provider);

// It's clear from this that the various
providers are quite different in the age & accuracy of their data...
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
float locAccuracy = location.getAccuracy();
long locAge = location.getTime();



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