Codigo para utilizar GoogleApiClient para el GPS

GPSServices.java

package py.com.puntofarma.deliverytracker30.services;
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.os.Bundle;
import android.os.IBinder;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

/**
 * Created by dario on 22/02/17. Mejoras para el DeliveryTracker20 V1.20
 */
//noinspection
public class GPSServices extends Service implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {
    private static final String TAG = "GPSServices";
    /**
     * The Location listener.
     */
//    LocationListener locationListener;
    /**
     * The Location manager.
     */
//    LocationManager locationManager;
//    protected static final int REQUEST_CHECK_SETTINGS = 0x1;
    private GoogleApiClient googleApiClient = null;
    private LocationRequest locationRequest = null;
//    private LocationSettingsRequest locationSettingsRequest;
    private Location currentLocation;
    
    private static String LOCATION = "location";
    
    @Override
    public void onCreate() {
        /*configurar el cliente de google*/
        googleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        
        /*conectar al servicio*/
        Log.w(TAG, "onCreate: Conectando el google client");
        googleApiClient.connect();
   
    }
    
    @Override
    public void onDestroy() {
        super.onDestroy();
       
        /*remover las actualizaciones*/
        LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, this);
      
        /*desconectar del servicio*/
        if (googleApiClient != null) {
            googleApiClient.disconnect();
        }
       
    }
    

    
    
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
    
    @Override
    public void onConnected(@Nullable Bundle bundle) {
        Log.w(TAG, "onConnected: Conectado");
        /*conectar a la libreria de google*/
 
        currentLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
         
      
        if (currentLocation != null){
            Intent intent = new Intent("servicio_posicion");
            intent.putExtra("location", currentLocation);
            sendBroadcast(intent);
        }
        
        /*iniciar las peticiones*/
        locationRequest = LocationRequest.create()
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                .setInterval(5000)
                .setFastestInterval(2000);
        
        LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
                
        
    }
    
    @Override
    public void onConnectionSuspended(int i) {
        if (i == CAUSE_SERVICE_DISCONNECTED) {
            Log.w(TAG, "onConnectionSuspended: Desconectado");;
        } else if (i == CAUSE_NETWORK_LOST) {
            Log.w(TAG, "onConnectionSuspended: Sin Red" );
        }
    }
    
    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        Log.w(TAG, "onConnectionFailed: Coneccion fallida: " + connectionResult.getErrorCode());
    }
    
    @Override
    public void onLocationChanged(Location location) {
        Log.w(TAG, "onLocationChanged: " + location.toString() );
        currentLocation = location;
        Intent intent = new Intent("servicio_posicion");
        intent.putExtra("location", currentLocation);
        sendBroadcast(intent);
    }
}