Get the last known location of the device, using the list of providers given - Android Map

Android examples for Map:Location Provider

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Description

Get the last known location of the device, using the list of providers given

Demo Code


import java.util.ArrayList;
import java.util.List;
import android.location.Location;
import android.location.LocationManager;
import android.util.Log;

public class Main{
    /**//w w w. j a va 2s. c om
     * According to Wolfram Alpha mean walking speed is 1.1m/s and so every second of age is 1.1
     * meters of additional inaccuracy
     */
    private static final double TIMEFACTOR = 1100;
    /**
     * Get the last known location of the device, using the list of providers given
     * 
     * @param providers
     * @param locationManager
     * @return
     */
    public static Location getLastKnownLocation(
            LocationManager locationManager) {
        List<String> providers = locationManager.getProviders(true);
        Log.i("Nearby", "Providers: " + providers);
        List<Location> lastLocations = new ArrayList<Location>(
                providers.size());
        for (String provider : providers) {
            Location last = locationManager.getLastKnownLocation(provider);
            if (last != null) {
                lastLocations.add(last);
            }
        }
        return selectBestLocation(lastLocations);
    }
    public static Location selectBestLocation(List<Location> locations) {
        long currentTime = System.currentTimeMillis();
        Location best = null;
        double accuracy = -1;
        for (Location location : locations) {
            if (null == best) {
                best = location;
                accuracy = location.getAccuracy()
                        * ((currentTime - location.getTime()) / LocationHelper.TIMEFACTOR);
            } else if (location.hasAccuracy()) {
                double newAccuracy = location.getAccuracy()
                        * ((currentTime - location.getTime()) / LocationHelper.TIMEFACTOR);
                if (newAccuracy > 0 && newAccuracy < accuracy) {
                    best = location;
                    accuracy = newAccuracy;
                }
            }
        }
        return best;
    }
}

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