added loading indicator for mapview

lib/state/mapState.dart

@@ -2,11 +2,18 @@ import 'package:flutter/cupertino.dart';
 
 class MapState extends ChangeNotifier {
   bool _isLocationLock = false;
+  bool _isCurrentlyFetchin = true;
 
   bool get followLocation => _isLocationLock;
+  bool get isCurrentlyFetching => _isCurrentlyFetchin;
 
   toggleLocationLock() {
     _isLocationLock = !_isLocationLock;
     notifyListeners();
   }
+
+  set setNetworkActivity(bool active) {
+    _isCurrentlyFetchin = active;
+    notifyListeners();
+  }
 }