LocationUtils.java

package cz.destil.wearsquare.util;

import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.os.SystemClock;

import cz.destil.wearsquare.core.App;

/**
 * Location-related utils.
 *
 * @author David Vávra (david@vavra.me)
 */
public class LocationUtils {

    private static final int MAX_LOCATION_AGE_MINUTES = 2;

    public static void getLastLocation(final LocationListener listener) throws SecurityException {
        // return "51.497470, -0.135633";//"40.765068,-73.983172"; // FAKE FOR screenshots
        final LocationManager locationManager = (LocationManager) App.get().getSystemService(Context.LOCATION_SERVICE);
        Location location = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
        if (location == null) {
            requestSingleLocation(listener, locationManager);
        } else {
            double locationAgeMinutes = ((double) (SystemClock.elapsedRealtimeNanos() - location.getElapsedRealtimeNanos())) / 60000000000L;
            if (locationAgeMinutes > MAX_LOCATION_AGE_MINUTES) {
                requestSingleLocation(listener, locationManager);
            } else {
                listener.onLocationUpdate(location.getLatitude() + "," + location.getLongitude());
            }
        }
    }

    private static void requestSingleLocation(final LocationListener listener, final LocationManager locationManager) throws SecurityException {
        IntentFilter locIntentFilter = new IntentFilter("SINGLE_LOCATION_UPDATE_ACTION");
        Intent updateIntent = new Intent("SINGLE_LOCATION_UPDATE_ACTION");
        final PendingIntent singleUpdatePI = PendingIntent.getBroadcast(App.get(), 0, updateIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        BroadcastReceiver singleUpdateReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                context.unregisterReceiver(this);
                String key = LocationManager.KEY_LOCATION_CHANGED;
                Location location = (Location) intent.getExtras().get(key);
                if (location != null) {
                    listener.onLocationUpdate(location.getLatitude() + "," + location.getLongitude());
                }
                locationManager.removeUpdates(singleUpdatePI);
            }
        };
        App.get().registerReceiver(singleUpdateReceiver, locIntentFilter);
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_MEDIUM);
        locationManager.requestSingleUpdate(criteria, singleUpdatePI);
    }


    public static int getLastAccuracy() throws SecurityException {
        LocationManager locationManager = (LocationManager) App.get().getSystemService(Context.LOCATION_SERVICE);
        Location location = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
        return (int) location.getAccuracy();
    }

    public static int getLastAltitude() throws SecurityException {
        LocationManager locationManager = (LocationManager) App.get().getSystemService(Context.LOCATION_SERVICE);
        Location location = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
        return (int) location.getAltitude();
    }

    public interface LocationListener {
        void onLocationUpdate(String location);
    }
}