如何从函数获取和打印地图数据(Flutter)

import 'package:flutter/material.dart';
import 'package:腾讯云地图插件库';

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

class _MapScreenState extends State<MapScreen> {
  TencentMapController _mapController;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Map'),
      ),
      body: TencentMap(
        onMapCreated: (controller) {
          _mapController = controller;
        },
      ),
    );
  }
}

class _MapScreenState extends State<MapScreen> {
  TencentMapController _mapController;
  LatLng _center;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Map'),
      ),
      body: TencentMap(
        onMapCreated: (controller) {
          _mapController = controller;
          _mapController.onMapMoveEnd.listen((_) {
            _getCenterLatLng();
          });
        },
      ),
    );
  }

  void _getCenterLatLng() async {
    LatLng center = await _mapController.getLatLng();
    setState(() {
      _center = center;
    });
    print('Center LatLng: $_center');
  }
}