Avoid disconnecting the map from the controller, as it can cause problems. If you need to change the map's contents:
Change its children (layers) individually
Usage In initState()
It is a fairly common requirement to need to use the MapController in initState(), before the map has been built. Unfortunately, this is not possible, as the map must be built for the controller to be attached.
This isn't a problem however! The MapOptions contains an onMapReady callback (see ) is called once when the map is initialised, and the initialised map controller can be used freely within it.
Whilst animated movements through MapControllers aren't built-in, the provides this, and much more!
The example application also includes a page demonstrating a custom animated map movement.
Re-initialise a new MapController, and keep it in an external state system
If you still get issues, and FlutterMap is located inside a PageView, ListView or another complex lazy layout, try setting keepAlivetrue in MapOptions: .
final mapController = MapController();
@override
Widget build(BuildContext context) =>
FlutterMap(
mapController: mapController,
options: MapOptions(
onMapReady: () {
mapController.mapEventStream.listen((evt) {});
// And any other `MapController` dependent non-movement methods
},
),
);
It may also be possible to use SchedulerBinding or WidgetsBinding in initState to run a method after the first frame has been built, as detailed here: . You'll probably see this approach in many older projects.
That method will, however, not work if the map is not built on the first frame. This may be the case if it is, for example, in a FutureBuilder.
MapController methods that change the position of the map should not be used instantly in onMapReady - see .
Using them as a reaction to a map event is still fine.