Make sure that location permission is granted by user.
Use WiFiForIoTPlugin.onWifiScanResultReady with WiFiForIoTPlugin.loadWifiList

This is how I do it in my proj:

class _WifiSSIDPickDialogState extends State<WifiSSIDPickDialog> {
  bool isScanning = true;
  List<WifiNetwork> networks;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) => scan(context));
  }

  Future<void> scan(BuildContext context) async {
    if (await _checkAndRequestLocationPermission()) {
      setState(() => isScanning = true);
      final scannedNetwork = await WiFiForIoTPlugin.loadWifiList();
      setState(() => networks = scannedNetwork);
      setState(() => isScanning = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<List<WifiNetwork>>(
      stream: WiFiForIoTPlugin.onWifiScanResultReady,
      builder: (context, snapshot) {
        final _networks = snapshot?.data ?? networks ?? [];
        ...
      },
    );
  }
}

Unofruntaley, this is not documented anywhere. If it works for you then any PR for doc improvement is welcomed.

WifiForIotPlugin.loadWifiList() always returns empty list. in Android 10 #184

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