如何在google maps flutter中获取当前摄像头位置

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

class MapScreen extends StatefulWidget {
  @override
  _MapScreenState createState() => _MapScreenState();
}

class _MapScreenState extends State<MapScreen> {
  GoogleMapController _controller;
  CameraPosition _cameraPosition;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Google Maps Flutter'),
      ),
      body: GoogleMap(
        onMapCreated: (controller) {
          _controller = controller;
        },
        onCameraMove: (position) {
          _cameraPosition = position;
        },
        initialCameraPosition: CameraPosition(
          target: LatLng(37.7749, -122.4194), // 设置初始位置
          zoom: 12.0, // 设置初始缩放级别
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          if (_controller != null) {
            // 获取当前摄像头位置
            final currentPosition = _controller.cameraPosition.target;
            print('当前摄像头位置：$currentPosition');
          }
        },
        child: Icon(Icons.location_searching),
      ),
    );
  }
}