LocationUtils.java

/*******************************************************************************
 * Copyright (c) 2011 Michel DAVID mimah35-at-gmail.com
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package fr.gotorennes.util;

import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;

public class LocationUtils implements LocationListener {

	private static LocationUtils instance;

	private LocationManager locationManager;

	private Location lastLocation = null;

	private boolean active;
	
	private Timer timer = new Timer();
	
	private class DisableTask extends TimerTask {
		
		@Override
		public void run() {
			removeListener(LocationUtils.this);
			active = false;
			lastLocation = null;
		}
	};

	private LocationUtils(Context context) {
		locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
	}

	private static synchronized LocationUtils getInstance(Context context) {
		if (instance == null) {
			instance = new LocationUtils(context);
		}
		return instance;
	}

	public static void activeLocation(Context context) {
		getInstance(context).activeLocation();
	}

	private synchronized void activeLocation() {
		timer.cancel();
		if (!active) {
			addListener(this);
			active = true;
		}
	}

	public static void desactiveLocation(Context context) {
		getInstance(context).desactiveLocation();
	}

	private synchronized void desactiveLocation() {
		if (active) {
			timer = new Timer();
			timer.schedule(new DisableTask(), 2000);
		}
	}

	public static Location getLocation(Context context) {
		return getInstance(context).lastLocation;
	}

	public static void addListener(Context context, LocationListener listener) {
		getInstance(context).addListener(listener);
	}

	private void addListener(LocationListener listener) {
		List<String> providers = locationManager.getAllProviders();
		if (providers.contains(LocationManager.GPS_PROVIDER) && locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
			locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000L, 0L, listener);
		} 
		if (providers.contains(LocationManager.NETWORK_PROVIDER) && locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
			locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000L, 0L, listener);
		}
		
	}

	public static void removeListener(Context context, LocationListener listener) {
		getInstance(context).removeListener(listener);
	}

	private void removeListener(LocationListener listener) {
		locationManager.removeUpdates(listener);
	}

	@Override
	public void onLocationChanged(Location location) {		
		if(LocationManager.NETWORK_PROVIDER.equals(location.getProvider())) {
			if(lastLocation == null || LocationManager.NETWORK_PROVIDER.equals(lastLocation.getProvider()) || !locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
				lastLocation = location;
				//Log.d("GoToRennes", location.toString());
			}
		}
		else {
			lastLocation = location;
			//Log.d("GoToRennes", location.toString());
		}
	}

	@Override
	public void onProviderDisabled(String provider) {
		
	}

	@Override
	public void onProviderEnabled(String provider) {
		
	}

	@Override
	public void onStatusChanged(String provider, int status, Bundle extras) {

	}
}