How to take XML data from API and extract data list from it

To handle the issues in the comments:

1. It should actually be returning a list (note the toList())
2. It should return something (not null - at least for now) on exception or non-200

Rewrite this method as:

Future<List<VehicleActivity>> fetchLiveLocations() async {
  var client = http.Client();

  try {
    var response = await client.get(Uri.parse('https_call'));
    if (response.statusCode == 200) {
      final doc = XmlDocument.parse(utf8.decode(response.bodyBytes));
      return doc
          .findAllElements('VehicleActivity')
          .map((e) => VehicleActivity.fromElement(e))
          .toList();
    } else {
      // todo - fix later - for now return empty list
      return <VehicleActivity>[];
    }
  } catch (e) {
    print('Exception Happened: ${e.toString()}');
    // todo - fix later - for now return empty list
    return <VehicleActivity>[];
  }
}