First flutter app. Trying to call a method from widget home screen - flutter

Question

I took an application from the internet using flutter_google_maps plugin. To this I added a method called centermap. I have tried countless things to try and get the app to read centermap and relocate the google map to the coordinates. I have tried googling but can't find any examples of doing this in Flutter.
Can some help to get me going. In the orginal code I copied the raised button works.
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
GoogleMapController mapController;
void main() {
runApp(MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Google Maps demo')),
body: MapsDemo(),
),
));
centerMap(mapController);
}
class MapsDemo extends StatefulWidget {
#override
State createState() => MapsDemoState();
}
class MapsDemoState extends State<MapsDemo> {
#override
Widget build(BuildContext context) {
return Padding (
padding: EdgeInsets.all(15.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Center(
child: SizedBox(
width: 400.0,
height: 500.0,
child: GoogleMap(
onMapCreated: _onMapCreated,
),
),
),
RaisedButton(
child: const Text('Go to London'),
onPressed: mapController == null ? null : (){
mapController.animateCamera(CameraUpdate.newCameraPosition(
const CameraPosition(
bearing: 270.0,
target: LatLng(51.5160895, -0.1294527),
tilt: 30.0,
zoom: 17.0,
),
));
},
),
],
),
);
}
void _onMapCreated(GoogleMapController controller) {
setState(() {
mapController = controller;
});
}
}
void centerMap(GoogleMapController mapController) {
mapController.animateCamera(
CameraUpdate.newCameraPosition(
CameraPosition(
target: LatLng(37.4219999, -122.0862462), zoom: 20.0),
),
);
}

Answer 1

I should have kept trying a few more minutes
This seems to work
void _onMapCreated(GoogleMapController controller) {
setState(() {
mapController = controller;
});
centerMap(mapController);
}
}
void centerMap(GoogleMapController mapController) {
mapController.animateCamera(
CameraUpdate.newCameraPosition(
CameraPosition(
target: LatLng(37.4219999, -122.0862462), zoom: 20.0),
),
);
}