loadFeatureLayers.dart

Future<void> loadFeatureLayers() async {
  final portal = Portal.arcGISOnline();
  final item = PortalItem.withPortalAndItemId(
    portal: portal,
    itemId: '49e3861dd16d4b4abdadbb1acbf26bd8',
  );
  final bufferItem = PortalItem.withPortalAndItemId(
    portal: portal,
    itemId: 'ad36192fc08340cb877d31593e3ef204',
  );
  _pointFeatureLayer = FeatureLayer.withFeatureLayerItem(item);
  _bufferFeatureLayer = FeatureLayer.withFeatureLayerItem(bufferItem);
  await _pointFeatureLayer.load();
  await _bufferFeatureLayer.load();
  _pointFeatureLayer.isVisible = false;
  _bufferFeatureLayer.isVisible = false;
  _warningPointsTable = _pointFeatureLayer.featureTable;
  _mapViewController.arcGISMap!.operationalLayers.addAll([
    _bufferFeatureLayer,
    _pointFeatureLayer,
  ]);
}