I need to receive location changes both from Network and GPS providers.
If GPS provider not avaliable or has not location (bad sattelite visibility) I would receive location from Network provider else from GPS provider.
Is it possible to select provider using criteria according to my necessity?
Actually Android Developers - Making Your App Location Aware has a great example code to meet your needs.
in its code, if you use both providers (from GPS and from Network) it will do a comparison:
...
} else if (mUseBoth) {
// Get coarse and fine location updates.
mFineProviderButton.setBackgroundResource(R.drawable.button_inactive);
mBothProviderButton.setBackgroundResource(R.drawable.button_active);
// Request updates from both fine (gps) and coarse (network) providers.
gpsLocation = requestUpdatesFromProvider(
LocationManager.GPS_PROVIDER, R.string.not_support_gps);
networkLocation = requestUpdatesFromProvider(
LocationManager.NETWORK_PROVIDER, R.string.not_support_network);
// If both providers return last known locations, compare the two and use the better
// one to update the UI. If only one provider returns a location, use it.
if (gpsLocation != null && networkLocation != null) {
updateUILocation(getBetterLocation(gpsLocation, networkLocation));
} else if (gpsLocation != null) {
updateUILocation(gpsLocation);
} else if (networkLocation != null) {
updateUILocation(networkLocation);
}
}
...
It implement the idea of best location providers (by determine the accuracy within a specified period of time like:
/** Determines whether one Location reading is better than the current Location fix.
* Code taken from
* http://developer.android.com/guide/topics/location/obtaining-user-location.html
*
* @param newLocation The new Location that you want to evaluate
* @param currentBestLocation The current Location fix, to which you want to compare the new
* one
* @return The better Location object based on recency and accuracy.
*/
protected Location getBetterLocation(Location newLocation, Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return newLocation;
}
// Check whether the new location fix is newer or older
long timeDelta = newLocation.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location, use the new location
// because the user has likely moved.
if (isSignificantlyNewer) {
return newLocation;
// If the new location is more than two minutes older, it must be worse
} else if (isSignificantlyOlder) {
return currentBestLocation;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (newLocation.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(newLocation.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return newLocation;
} else if (isNewer && !isLessAccurate) {
return newLocation;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return newLocation;
}
return currentBestLocation;
}
For complete code, please have a look at the link provided above.
For search best location Provider please user belowe code : Please refer https://developer.android.com/reference/android/location/Criteria.html for understand, How criteria will going to work ?
public String getProviderName() {
LocationManager locationManager =(LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setPowerRequirement(Criteria.POWER_LOW);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setSpeedRequired(true);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(false);
return locationManager.getBestProvider(criteria, true);
}
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