在Flutter Google Map中自定义中心位置按钮

dependencies:
  google_maps_flutter: ^2.0.10

import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';

class GoogleMapPage extends StatefulWidget {
  @override
  _GoogleMapPageState createState() => _GoogleMapPageState();
}

class _GoogleMapPageState extends State<GoogleMapPage> {
  GoogleMapController? _mapController;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Google Map'),
      ),
      body: GoogleMap(
        onMapCreated: (controller) {
          setState(() {
            _mapController = controller;
          });
        },
        initialCameraPosition: CameraPosition(
          target: LatLng(37.42796133580664, -122.085749655962),
          zoom: 14.0,
        ),
      ),
    );
  }
}

class _GoogleMapPageState extends State<GoogleMapPage> {
  GoogleMapController? _mapController;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Google Map'),
      ),
      body: Stack(
        children: [
          GoogleMap(
            onMapCreated: (controller) {
              setState(() {
                _mapController = controller;
              });
            },
            initialCameraPosition: CameraPosition(
              target: LatLng(37.42796133580664, -122.085749655962),
              zoom: 14.0,
            ),
          ),
          Positioned(
            top: 16.0,
            right: 16.0,
            child: FloatingActionButton(
              onPressed: () {
                _mapController?.animateCamera(
                  CameraUpdate.newLatLng(
                    LatLng(37.42796133580664, -122.085749655962),
                  ),
                );
              },
              child: Icon(Icons.location_searching),
            ),
          ),
        ],
      ),
    );
  }
}