flutter googlemap缩放控制位置

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 mapController;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Google Maps'),
      ),
      body: GoogleMap(
        onMapCreated: (controller) {
          setState(() {
            mapController = controller;
          });
        },
        initialCameraPosition: CameraPosition(
          target: LatLng(37.7749, -122.4194), // 初始地图位置
          zoom: 12.0, // 初始缩放级别
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          mapController.animateCamera(
            CameraUpdate.zoomIn(), // 放大地图
          );
        },
        child: Icon(Icons.add),
      ),
    );
  }
}