How to create circle on current location in flutter

If you use flutter_map plugin, then you can draw radius circle easily. Here is the code.

FlutterMap(
    options: MapOptions(
        center: LatLng(latitude, longitude),
        zoom: 16.0
    ),
    layers: [
        TileLayerOptions(
            urlTemplate: "map url",
            additionalOptions:  {
            "accessToken" : "xxx",
            "id" : "map id"
            }
        ), 
        MarkerLayerOptions(
            markers: Marker( //marker
                width: 25.0,
                height: 25.0,
                point: LatLng(latitude, longitude),
                builder: (context) {
                return Container(
                    child: IconButton(
                        icon: Icon(Icons.my_location),
                        iconSize: 25.0,
                        color: Color(0xff9045f7),
                        onPressed: () {
                            print('marker tapped');
                        },
                        ),
                    );
                }
            )
        ),
        CircleLayerOptions(
            circles: CircleMarker( //radius marker
                point: LatLng(latitude, longitude),
                color: Colors.blue.withOpacity(0.3),
                borderStrokeWidth: 3.0,
                borderColor: Colors.blue,
                radius: 100 //radius
            )
        )
    ],
),)

One way to do this is by changing the icon of the Marker

mapController.addMarker(MarkerOptions(
    position: LatLng(37.4219999, -122.0862462),
    icon: BitmapDescriptor.fromAsset('images/circle.png',),
     ),
);

After setting appropriate permission on android/ios, set trackCameraPosition: true and myLocationEnabled: true on google maps options, after that you can add your image in current location by following code

mapController.addMarker(MarkerOptions(
    position: mapController.cameraPosition.target,
    icon: BitmapDescriptor.fromAsset('images/circle.png',),
    ),
);

Here is an excellent article which explains all possible things you can do with Google Maps for Flutter (Developers Preview) plugin article

You could use google_maps_flutter plugin, here is the code:

circles: Set.from([Circle( circleId: CircleId('currentCircle'),
      center: LatLng(position.latitude,position.longitude),
      radius: 4000,
          fillColor: Colors.blue.shade100.withOpacity(0.5),
          strokeColor:  Colors.blue.shade100.withOpacity(0.1),
    ),],),

This functionality is now available in the google_maps_flutter package:

https://pub.dev/documentation/google_maps_flutter_platform_interface/latest/google_maps_flutter_platform_interface/Circle-class.html

Partial example:

Set<Circle> circles = Set.from([Circle(
    circleId: CircleId(id),
    center: LatLng(latitude, longitude),
    radius: 4000,
)]);

GoogleMap(
    mapType: MapType.normal,
    myLocationEnabled: true,
    myLocationButtonEnabled: true,
    initialCameraPosition: initialMapLocation,
    onMapCreated: (GoogleMapController controller) {
      _controller.complete(controller);
    },
    onCameraMove: null,
    circles: circles,
  );