Flutter怎么实现地图导航功能？

flutter_svg: ^0.19.1  ##只在使用图标的使用导入，不用可以不导入
  map_launcher: ^1.1.3+1
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<key>LSApplicationQueriesSchemes</key>
<array>
    <string>comgooglemaps</string>
    <string>baidumap</string>
    <string>iosamap</string>
    <string>waze</string>
    <string>yandexmaps</string>
    <string>yandexnavi</string>
    <string>citymapper</string>
    <string>mapswithme</string>
    <string>osmandmaps</string>
    <string>dgis</string>
    <string>qqmap</string>
    <string>here-location</string>
</array>
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import 'package:map_launcher/map_launcher.dart';
final availableMaps = await MapLauncher.installedMaps;
print(availableMaps); 
await availableMaps.first.showMarker(
  coords: Coords(28, 120),
  title: "坚果前端",
);
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import 'package:map_launcher/map_launcher.dart';
if (await MapLauncher.isMapAvailable(MapType.google)) {
  await MapLauncher.showMarker(
    mapType: MapType.google,
    coords: coords,
    title: title,
    description: description,
  );
}
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import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:map_launcher/map_launcher.dart';
class MapsSheet {
  static show({
    @required BuildContext context,
    @required Function(AvailableMap map) onMapTap,
  }) async {
    final availableMaps = await MapLauncher.installedMaps;
    for (var map in availableMaps) {
      map.mapName = getLocalName(amap: map);
    }
    showModalBottomSheet(
      context: context,
      backgroundColor: Colors.transparent,
      builder: (BuildContext context) {
        return SafeArea(
          child: Container(
            decoration: BoxDecoration(
              color: Colors.white,
              borderRadius: BorderRadius.all(Radius.circular(20)),
            ),
            child: Column(
              children: <Widget>[
                Expanded(
                  child: SingleChildScrollView(
                    child: Container(
                      child: Wrap(
                        children: <Widget>[
                          for (var map in availableMaps)
                            ListTile(
                              onTap: () => onMapTap(map),
                              title: Text(map.mapName),
                              leading: SvgPicture.asset(
                                map.icon,
                                height: 50.0,
                                width: 50.0,
                              ),
                            ),
                        ],
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
        );
      },
    );
  }
}
String getLocalName({AvailableMap amap}) {
  switch (amap.mapType) {
    case MapType.amap:
      return '高德地图';
    case MapType.baidu:
      return '百度地图';
    case MapType.tencent:
      return '腾讯地图';
    case MapType.google:
      return '谷歌地图';
    case MapType.apple:
      return '苹果地图';
    default:
      return amap.mapName;
  }
}
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MapsSheet.show(
                context: context,
                onMapTap: (map) {
                  map.showMarker(
                    coords: Coords(_local.lat, _local.lng),
                    title: _local.addr,
                    zoom: 20,
                  );
                },
              );
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