QGeoCoordinate returns Nan

GrishaE

Hi!
I` m trying to implement positioning on Android, but it returns coordinates as "nan";
Here is the code:

 QString *text = new QString;


    auto source = QGeoPositionInfoSource::createDefaultSource(this);
    if(source){
    text->append("sourceName: " + source->sourceName()); //return: core location
    source->setPreferredPositioningMethods(QGeoPositionInfoSource::AllPositioningMethods);
    source->setUpdateInterval(1000);
    source->requestUpdate();


    }

    QLabel *lbl = new QLabel;
    QGeoPositionInfo info = source->lastKnownPosition();
    QGeoCoordinate coordinate = info.coordinate();
    auto  latitude = QString::number(coordinate.latitude());
    auto longitude = QString::number(coordinate.longitude());

    lbl->setText(*text);

    QString all;
    all = latitude;
    all += ",";
    all += longitude;
    //lbl->setText(all);

    QString URL("https://www.google.ru/maps/@" + all);

    QUrl myUrl(URL);
    QDesktopServices::openUrl(myUrl);