Apps Location using google api without GPS (only network/gsm)

[Smartgatto]

Hello everyone ,
I'm developing an app to display the coordinates of my phone and I would use the google api for localization ( FusedLocationProvider ) but without using the GPS, only coordinates by wifi or GSM (network?) , so I thought to use PRIORITY_LOW_POWER or PRIORITY_NO_POWER, but if I deactivate GPS gives me error ( NULL ), whereas if the active GPS gives me the coordinates . How can I do?
thanks !

public class MainActivity extends FragmentActivity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener{

    TextView tvLocation;
    GoogleApiClient mGoogleApiClient;
    Location locationUp;
    LocationRequest mLocationRequest=new LocationRequest();
    boolean requestingLocationUpdate=true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);

        tvLocation = (TextView) findViewById(R.id.longitude_label);//last location

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

        mLocationRequest.setInterval(10000);
        mLocationRequest.setFastestInterval(5000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
    }

    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();//be connected with GoogleApiClient
    }

    @Override
    public void onConnected(Bundle bundle) {
        updateUI();
        if(requestingLocationUpdate){
            startLocationUpdate();//trying to get the update location
        }
    }

    private void startLocationUpdate() {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,mLocationRequest,this);
    }

    private void updateUI() {
        tvLocation.setText(String.valueOf(getLocation().getLatitude())+String.valueOf(getLocation().getLongitude()));
    }

    private Location getLocation() {
        Location lastKnownLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        return lastKnownLocation;
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

         }

    @Override
    protected void onPause() {
        super.onPause();
        stopLocationUpdate();//when activity is on pause, need to stop the location update since we
//do not need that any more
    }

    private void stopLocationUpdate() {

        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);//stopping the update location
    }
    //no need to use googleplayservices
    @Override
    protected void onStop() {
        super.onStop();
        mGoogleApiClient.disconnect();//disconnect the GoogleApiClient from the google play services
    }

    @Override
    protected void onResume() {
        super.onResume();
        if(mGoogleApiClient.isConnected()){
            startLocationUpdate();// since we need to get the update location continuously like gps
//when activity is in foreground(resume), then we have to request to get update location
//here alos
        }
    }

    //to get the location change
    @Override
    public void onLocationChanged(Location location) {

        locationUp=location;//this location is the update location,
// came from the requestLocationUpdate() method’s interface
        updateView();//put your value in the text or whatever you want to do
    }

    private void updateView() {
   //     tvLocationUpdate.setText(“Update Location:”+String.valueOf(locationUp.getLatitude())+String.valueOf(locationUp.getLongitude()));
    }
}