Flutter google maps: update markers - google-maps

Question

I'm trying to update the coordinates of a marker (Google Maps flutter)
I'm 'creating' the marker like this.
Map<MarkerId, Marker> markers = <MarkerId, Marker>{};
Uint8List resizedMarkerImageBytesTemp = await convertUserImage(
"imgurl");
MarkerId id = MarkerId(uid);
Marker _marker = Marker(
markerId: id,
onTap: () {
print("tapped");
},
position: LatLng(lat, lng),
icon: BitmapDescriptor.fromBytes(resizedMarkerImageBytesTemp),
infoWindow: InfoWindow(title: 'myTitle'),
);
setState(() {
markers[id] = _marker;
});
What's the best / most efficient way to update the coordinates of a marker?
Thanks!
UPDATE: I tried the following.
MarkerId id = MarkerId(uid); //uid of the marker I want to update
markers[id].position.longitude = 3.12493;
But then I get the error:
error: 'longitude' can't be used as a setter because it is final.

Answer 1

You can create a function and pass the markerId to replace the actual marker:
updateMarker(id){
final marker = markers.values.toList().firstWhere((item) => item.markerId == id);
Marker _marker = Marker(
markerId: marker.markerId,
onTap: () {
print("tapped");
},
position: LatLng(marker.position.latitude, marker.position.longitude),
icon: marker.icon,
infoWindow: InfoWindow(title: 'my new Title'),
);
setState(() {
//the marker is identified by the markerId and not with the index of the list
markers[id] = _marker;
});
}

Answer 2

You can easily use this code anywhere you want to change the position:
setState((){markers[id]=markers[id].copyWith(positionParam:LatLng(yournewlat,your new long));});
You can even use it in marker on tap callback.