Cluster perform no update after adding new marker to list

[cwreden]

I am using the version 1.2.0 and trying to add new markers to list by button or search results.

When I using the flutter_map MarkerLayer the added maker is displayed on the map, but not for the cluster layer.

Maybe I missed something from the examples and you can give me a hint what I have to change.

Here a code snippet:

List<Marker> _markers = [];
List<Marker> _testMarkers = [];

...
PopupScope(
        popupController: _popupController,
        child: FlutterMap(
          mapController: mapController,
          options: MapOptions(
            zoom: 9.2,
            onTap: (_, __) => _popupController.hideAllPopups(),
          ),
          nonRotatedChildren: [
            RichAttributionWidget(
              attributions: [
                TextSourceAttribution(
                  'OpenStreetMap contributors',
                  onTap: () => Uri.parse('https://openstreetmap.org/copyright'),
                ),
              ],
            ),
          ],
          children: [
            TileLayer(
              urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
              userAgentPackageName: 'com.example.app',
            ),
            MarkerLayer(markers: _testMarkers),
            MarkerClusterLayerWidget(
                options: MarkerClusterLayerOptions(
                  markers: _markers,
                  popupOptions: PopupOptions(
                  //     popupSnap: PopupSnap.markerTop,
                      popupController: _popupController,
                      popupBuilder: (_, marker) {
                        return MarkerPopup(marker: marker,);
                      }),
                  builder: (context, markers) {
                    return Container(
                      decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(20),
                          color: Colors.blue),
                      child: Center(
                        child: Text(
                          markers.length.toString(),
                          style: const TextStyle(color: Colors.white),
                        ),
                      ),
                    );
                  },
                ),
            ),
          ],
        ),
      ),
...
addMarker() {
_markers.add(...);  // did not work
_testMarkers.add(...); // works
}

Best regards
Chris

[nahit-fidanci-alg]

I have the same issue. I tried to rebuild the whole widget tree but it didn't work.

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[SimonTellier]

I don't know if anyone has answered your question, but I had the same problem as you.
You need to rebuild a new list of markers for your cluster to be updated.

    setState(() {
      markers = List.from(markers);
    });

[nahit-fidanci-alg]

@SimonTellier Thank you for your reply Simon. I started to use SuperCluster which makes things easier. But, your answer makes sense to me. The map cannot respond to changes in the list since it doesn't look up inside. I think a new list would need to be solved as you suggested. Thanks!