Google function for better location verification. - Android Map

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Description

Google function for better location verification.

Demo Code

/* **************************************************
Copyright (c) 2014, University of Birmingham
Karthikeya Udupa, kxu356@bham.ac.uk/*from w  ww.j  a  v  a 2 s  .c  o m*/

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 ************************************************** */
import java.util.Date;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;

public class Main{
    /**
     * Google function for better location verification.
     * http://developer.android.com/guide/topics/location/strategies.html
     * @param location
     * @param currentBestLocation
     * @return
     */
    public static boolean isBetterLocation(Location location,
            Location currentBestLocation) {
        if (currentBestLocation == null) {
            // A new location is always better than no location
            return true;
        }

        if (location == null) {
            // A new location is always better than no location
            return false;
        }

        // Check whether the new location fix is newer or older
        long timeDelta = location.getTime() - currentBestLocation.getTime();
        boolean isSignificantlyNewer = timeDelta > Constants.MAXIMUM_ACCEPTABLE_TIME;
        boolean isSignificantlyOlder = timeDelta < -Constants.MAXIMUM_ACCEPTABLE_TIME;
        ;
        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 true;
            // If the new location is more than two minutes older, it must be
            // worse
        } else if (isSignificantlyOlder) {
            return false;
        }

        // Check whether the new location fix is more or less accurate
        int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation
                .getAccuracy());
        boolean isLessAccurate = accuracyDelta > Constants.MAXIMUM_ACCEPTABLE_DISTANCE;
        boolean isMoreAccurate = accuracyDelta < Constants.MAXIMUM_ACCEPTABLE_DISTANCE;
        boolean isSignificantlyLessAccurate = accuracyDelta > 400;

        // Check if the old and new location are from the same provider
        boolean isFromSameProvider = isSameProvider(location.getProvider(),
                currentBestLocation.getProvider());

        // Determine location quality using a combination of timeliness and
        // accuracy
        if (isMoreAccurate) {
            return true;
        } else if (isNewer && !isLessAccurate) {
            return true;
        } else if (isNewer && !isSignificantlyLessAccurate
                && isFromSameProvider) {
            return true;
        }
        return false;
    }
    /**
     * Compare location providers.
     * http://developer.android.com/guide/topics/location/strategies.html
     * @param provider1
     * @param provider2
     * @return
     */
    public static boolean isSameProvider(String provider1, String provider2) {
        if (provider1 == null) {
            return provider2 == null;
        }
        return provider1.equals(provider2);
    }
}

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