Better location handling on map

frontend/lib/modules/new_trip_map.dart

@@ -7,6 +7,7 @@ import 'package:anyway/structs/landmark.dart';
 import 'package:anyway/structs/trip.dart';
 import 'package:flutter/material.dart';
 import 'package:google_maps_flutter/google_maps_flutter.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:widget_to_marker/widget_to_marker.dart';
 
 
@@ -72,6 +73,23 @@ class _NewTripMapState extends State<NewTripMap> {
   @override
   Widget build(BuildContext context) {
     widget.trip.addListener(updateTripDetails);
+    Future<SharedPreferences> preferences = SharedPreferences.getInstance();
+
+    return FutureBuilder(
+      future: preferences,
+      builder: (context, snapshot) {
+        if (snapshot.hasData) {
+          SharedPreferences prefs = snapshot.data as SharedPreferences;
+          bool useLocation = prefs.getBool('useLocation') ?? true;
+          return _buildMap(useLocation);
+        } else {
+          return const CircularProgressIndicator();
+        }
+      }
+    );
+  }
+
+  Widget _buildMap(bool useLocation) {
     return GoogleMap(
       onMapCreated: _onMapCreated,
       initialCameraPosition: _cameraPosition,
@@ -80,8 +98,8 @@ class _NewTripMapState extends State<NewTripMap> {
       cloudMapId: MAP_ID,
       mapToolbarEnabled: false,
       zoomControlsEnabled: false,
-      // TODO: should be loaded from the sharedprefs
-      myLocationEnabled: true,
+      myLocationButtonEnabled: false,
+      myLocationEnabled: useLocation,
     );
   }
 }