使用youtube_player_flutter v9.0.1时遇flutter_inappwebview未设置错误求助

错误信息 #

The following assertion was thrown building RawYoutubePlayer(dirty, dependencies: [InheritedYoutubePlayer], state: _RawYoutubePlayerState#d7415):
A platform implementation for `flutter_inappwebview` has not been set. Please ensure that an implementation of `InAppWebViewPlatform` has been set to `InAppWebViewPlatform.instance` before use. For unit testing, `InAppWebViewPlatform.instance` can be set with your own test implementation.
'package:flutter_inappwebview_platform_interface/src/in_app_webview/platform_inappwebview_widget.dart':
Failed assertion: line 202 pos 7: 'InAppWebViewPlatform.instance != null'

使用插件的代码 #

import 'package:flutter/material.dart';
import 'package:fitness_project/models/workout.dart';
import 'package:youtube_player_flutter/youtube_player_flutter.dart';

class WorkoutDetail extends StatefulWidget{
  Workout? workout;
  WorkoutDetail({super.key,this.workout});

  @override
  WorkoutDetailState createState() => WorkoutDetailState(workout: workout);
}

class WorkoutDetailState extends State<WorkoutDetail>{
  Workout? workout;
  WorkoutDetailState({this.workout});

  YoutubePlayerController controller = YoutubePlayerController(
    initialVideoId: 'CbggneVFrx8',
    flags: YoutubePlayerFlags(autoPlay:false,
    ),
  );

  @override
  Widget build(BuildContext context) {
   return Scaffold(
       appBar: AppBar(automaticallyImplyLeading: false,
         backgroundColor: Colors.indigoAccent,
    title: Text(("Workout Details"),
    style:const TextStyle(color: Colors.white)),
    ),
    backgroundColor: Colors.black,
     body: Container(
         child: Center(
             child:Container(
                 child:Column(mainAxisAlignment: MainAxisAlignment.center ,
                   children: [
                     YoutubePlayer(
                       controller: controller,
                     ),
                     
                     Container(decoration: BoxDecoration(border: Border.all(color: Colors.white),
                         color: Colors.white24,
                         borderRadius: BorderRadius.all(Radius.circular(15)) ),
                       height: 150,
                       padding: EdgeInsets.only(top:10,bottom: 20),
                       margin: EdgeInsets.only(left: 20,right:20,top:15,bottom:15),
                       child: Column(children: [

                         Text("Steps to do this workout ",style: TextStyle(color: Colors.white, fontSize: 24)),

                         Divider(color: Colors.white, indent: 10,endIndent:10  ),

                        Expanded(child: Container(
                         child:  Text("Put your hands on ground and jump ",
                             style: TextStyle(color: Colors.white, fontSize: 19)), ))

           ],)
                     )],
                 ))))
   );
  }
}

已完成的配置 #

• minSdkVersion 设置为21
• 开启 android.useAndroidX=true 和 android.enableJetifier=true
• Android Gradle插件版本为7.3.0

pubspec.yaml配置 #

name: fitness_project
description: "A new Flutter project."
# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
# In Windows, build-name is used as the major, minor, and patch parts
# of the product and file versions while build-number is used as the build suffix.
version: 1.0.0+1

environment:
  sdk: '>=3.2.5 <4.0.0'

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  firebase_core: ^2.27.0
  firebase_auth: ^4.17.8
  cloud_firestore: ^4.15.8
  youtube_player_flutter: ^9.0.1
  syncfusion_flutter_gauges: ^25.1.39


dev_dependencies:
  flutter_test:
    sdk: flutter

  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^2.0.0

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter packages.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - assets/images/


  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

解决方案 #

这个错误是因为youtube_player_flutter v9.x版本依赖flutter_inappwebview，但依赖的版本可能存在兼容问题，或者没有正确初始化平台实现。可以按以下步骤解决：

• 手动添加指定版本的flutter_inappwebview依赖
  在pubspec.yaml的dependencies中添加：

flutter_inappwebview: ^5.8.0

执行flutter pub get拉取依赖。

• 清理并重建项目
  依次执行flutter clean清除缓存，重启IDE后重新编译运行项目。

• 调整控制器初始化时机
  将YoutubePlayerController的初始化移到initState中，避免提前初始化导致的问题，同时记得在dispose中释放资源：

YoutubePlayerController? controller;

@override
void initState() {
  super.initState();
  controller = YoutubePlayerController(
    initialVideoId: 'CbggneVFrx8',
    flags: const YoutubePlayerFlags(autoPlay: false),
  );
}

@override
void dispose() {
  controller?.dispose();
  super.dispose();
}

内容的提问来源于stack exchange，提问作者Mohammad Saim