main.dart

  void main() => runApp(DemoApp());

  class DemoApp extends StatelessWidget {
    const DemoApp();

    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        home: Scaffold(
            appBar: AppBar(
              title: const Text("Using Geolocator"),
            ),
            body: const Center(
              child: GPSWidget(),
            )
        ),
      );
    }

  }
  

gps_widget.dart

  class GPSWidget extends StatelessWidget {
    static final _stream = getPositionStream();
    const GPSWidget();

    @override
    Widget build(BuildContext context) {
      return Wrap(
        spacing: 20,
        direction: Axis.vertical,
        crossAxisAlignment: WrapCrossAlignment.center,
        children: <Widget>[
          SvgPicture.asset(
            "assets/geolocate.svg",
            height: 70,
          ),

          StreamBuilder<Position>(
            stream: _stream,
            builder: (context, positionData) {
              if (positionData.hasData) {
                final data = positionData.data;

                if (data != null) {
                  final lat = data.latitude.toStringAsFixed(5);
                  final lon = data.longitude.toStringAsFixed(5);

                  return Text("$lat | $lon");
                } else {
                  return const Text("No data available.");
                }
              }

              return const CircularProgressIndicator();
            },
          )
        ],
      );
    }

  }