Used Provider-Package to encapsulate state management

lib/services/flood_station_provider.dart

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+import 'package:flutter/material.dart';
+
+import '../model/flood_station.dart';
+import 'api.dart';
+
+class FloodStationProvider extends ChangeNotifier {
+  List<FloodStation> _allStations = [];
+  FloodStation? selectedStation;
+
+  List<FloodStation> get allStations => _allStations;
+
+  Future loadAllStations({silent = false}) {
+    return Api.fetchStations().then(
+      (value) {
+        _allStations = value;
+        if (!silent) {
+          notifyListeners();
+        }
+      },
+    );
+  }
+}