Flutter-Google Maps等不及去位置 [英] Flutter - Google Maps doesn´t wait to Location

问题描述

我正在尝试显示当前位置的地图.为此，我使用了 位置 和 Google Map 插件(最新版本).

I´m trying to show a map with current location. For do this i used Location and Google Map plugins (last version).

我有类似的代码:

var lng, lat;

          @override
          initState() {
            super.initState();
            loading = true;
            getLocation();
          }

              Future getLocation() async {
                    final location = Location();
                    var currentLocation = await location.getLocation();
                    setState(() {
                      lat = currentLocation.latitude;
                      lng = currentLocation.longitude;
                      loading=false;
                    });
                  }

             loading==false ? GoogleMap(
                 mapType: MapType.hybrid,
                 myLocationButtonEnabled: true,
                 myLocationEnabled: true,
                 initialCameraPosition: CameraPosition(
                      target: LatLng(lat, lng),
                      zoom: 15.0,
                            )):null,

当我们进入带有地图的视图时，控制台中出现此错误的时间约为1秒(然后正确加载了视图)

When we go the view with map a error appear around 1s (then view load properly) with this error in the console

I/flutter(15567):══╡小组件库引起的异常提示 ╞═════════════════════════════════════════════════ ══════════我/扑 (15567):以下断言被抛出 HomePageScreen(脏，依赖项:I/flutter(15567): [_LocalizationsScope- [GlobalKey#78c30]，MediaQuery]，状态: _HomePageScreen#9c9d2):I/flutter(15567):"package:google_maps_flutter/src/location.dart":失败的断言: 第17行pos 16:'latitude！= I/flutter(15567):null':不正确.

I/flutter (15567): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ I/flutter (15567): The following assertion was thrown building HomePageScreen(dirty, dependencies: I/flutter (15567): [_LocalizationsScope-[GlobalKey#78c30], MediaQuery], state: _HomePageScreen#9c9d2): I/flutter (15567): 'package:google_maps_flutter/src/location.dart': Failed assertion: line 17 pos 16: 'latitude != I/flutter (15567): null': is not true.

我对其进行调试，错误相对简单: Location 插件加载纬度和经度较慢， Google Maps 插件加载速度更快.所以我们有一个错误.

I debug it and the error is relative simple: The Location plugin load latitude and longitude slow , Google Maps plugin load more fast. So we have a error.

问题是:如何强制Google地图通过位置"插件等待位置和经度?

The question is: How can i force Google map to wait location and longitude from Location plugin?

推荐答案

在lat和lng为空时显示空的Container()或任何加载指示器.

Show an empty Container() or any loading indicator while your lat and lng is null.

lat == null || lng == null
  ? Container()
  : GoogleMap(
      mapType: MapType.hybrid,
      myLocationButtonEnabled: true,
      myLocationEnabled: true,
      initialCameraPosition: CameraPosition(
        target: LatLng(lat, lng),
        zoom: 15.0,
      ),
    );

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