Flutter Google 地图，正在尝试创建一个已创建的平台视图，视图 ID：0

Question

第一次 google 地图不稳定，加载完美，但热重启时，它会出现平台异常

google_maps_flutter: ^0.5.21+15

Github [google_maps_flutter] Trying to create an already created platform view #45695

[ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(error, java.lang.IllegalStateException: Trying to create an already created platform view, view id: 0

颤振医生-v

[✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Linux, locale en_IN)
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Answer 1

根据 API、

Do not change the camera with this camera update until the map has undergone layout (in order for this method to correctly determine the appropriate bounding box and zoom level, the map must have a size). Otherwise an IllegalStateException will be thrown.

我遇到了同样的问题，经过一些调试，似乎每当您在查看地图时热重载，它都会给出错误。

但是如果在处理地图后热重载，则可以避免错误。

换句话说，它是为了防止多个地图实例处于活动状态。

所以我建议在开发过程中在热重载之前处理地图。

在生产版本中，用户将无法热重载，因此他们不会遇到平台问题。

Answer 2

问题是由于在多个 GoogleMaps 小部件中使用了相同的控制器。只构建一个 GoogleMap 小部件并使用 GoogleMapController 对象进行任何更改。

Answer 3

这里引用了这个问题：https://github.com/flutter/flutter/issues/45695

Answer 4

为了解决这个问题，我通过终端执行了以下操作：

1- 将分支更改为 Master 分支：

flutter channel master

2- 升级版 Flutter

flutter upgrade

3- 清理代码：

flutter clean

Answer 5

我也遇到了同样的问题，使用 flutter clean 并没有为我解决问题（flutter version 1.12.13+hotfix 8）

但是，向小部件添加唯一键（不是它的状态）解决了我的问题。

演示这一点的最小工作代码示例。

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Map not crashing demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: LocationScreen(),
    );
  }
}

class LocationScreen extends StatefulWidget 
{
  final Key _mapKey = UniqueKey();
  @override
  _LocationScreenState createState() => _LocationScreenState();
}

class _LocationScreenState extends State<LocationScreen> 
{
  @override
  Widget build(BuildContext context) 
  {
    return Scaffold(
      appBar: AppBar(title: const Text('Map not crashing demo')),
      body: TheMap(key:widget._mapKey)
    );
  }
}

class TheMap extends StatefulWidget 
{
  ///key is required, otherwise map crashes on hot reload
  TheMap({ @required Key key})
  :
  super(key:key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<TheMap> 
{
  GoogleMapController _mapController ;

  void _onMapCreated(GoogleMapController controller) {
    _mapController = controller;
  }
  @override
  Widget build(BuildContext context) 
  {
    return Scaffold(
      //also this avoids it crashing/breaking when the keyboard is up
      resizeToAvoidBottomInset: false,
      body: GoogleMap(
          onMapCreated: _onMapCreated,
          initialCameraPosition: CameraPosition(
            target: const LatLng(30.0925973,31.3219982),
            zoom: 11.0,
          ),
        )
    );
  }
}

Flutter Google 地图，正在尝试创建一个已创建的平台视图，视图 ID：0

Flutter Google Maps, Trying to create an already created platform view, view id: 0

android

google-maps

flutter

google-maps-flutter