Determines whether one Location reading is better than the current Location - Android Map

Android examples for Map:Location

  1. HOME
  2. Android
  3. Map
  4. Location

Description

Determines whether one Location reading is better than the current Location

Demo Code


//package com.java2s;
import android.location.Location;

public class Main {
    private static final int TWO_MINUTES = 1000 * 60 * 2;

    /**/* ww w.  j a va2  s . c  om*/
     * Determines whether one Location reading is better than the current Location fix
     * http://developer.android.com/guide/topics/location/strategies.html
     * 
     * @param location
     *            The new Location that you want to evaluate
     */
    public static boolean isBetterLocation(Location currentBestLocation,
            Location newLocation) {
        if (currentBestLocation == null) {
            // A new location is always better than no location
            return true;
        }

        // 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 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) (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 true;
        } else if (isNewer && !isLessAccurate) {
            return true;
        } else if (isNewer && !isSignificantlyLessAccurate
                && isFromSameProvider) {
            return true;
        }
        return false;
    }

    private static boolean isSameProvider(String provider1, String provider2) {
        if (provider1 == null) {
            return provider2 == null;
        }
        return provider1.equals(provider2);
    }
}

Related Tutorials