Flutter构建失败：inappwebview错误：包okhttp3不存在

添加youtube_player_Flatter v8.0.0时的说明（链接：https://github.com/sarbagyastha/youtube_player_flutter)Flutter（android）应用程序无法生成，错误日志如下：

C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\in_app_webview\InAppWebView.java:97: error: package okhttp3 does not exist
import okhttp3.OkHttpClient;
              ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\in_app_webview\InAppWebView.java:121: error: cannot find symbol

  public OkHttpClient httpClient;
         ^
  symbol:   class OkHttpClient
  location: class InAppWebView
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:24: error: package okhttp3 does not exist
import okhttp3.Request;
              ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:25: error: package okhttp3 does not exist
import okhttp3.Response;
              ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\Util.java:46: error: package okhttp3 does not exist

import okhttp3.OkHttpClient;
              ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\Util.java:175: error: cannot find symbol
  public static OkHttpClient getUnsafeOkHttpClient() {
                ^
  symbol:   class OkHttpClient
  location: class Util
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\in_app_webview\InAppWebView.java:184: error: cannot find symbol
    httpClient = new OkHttpClient().newBuilder().build();
                     ^
  symbol:   class OkHttpClient
  location: class InAppWebView
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:180: error: cannot find symbol
                            Request mRequest = new Request.Builder().url(urlHttps).build();
                            ^
  symbol:   class Request
  location: class ContentBlockerHandler
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:180: error: package Request does not exist

                            Request mRequest = new Request.Builder().url(urlHttps).build();
                                                          ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:181: error: cannot find symbol
                            Response response = null;
                            ^
  symbol:   class Response
  location: class ContentBlockerHandler
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:231: error: cannot find symbol
            Request mRequest = new Request.Builder().url(url).head().build();
            ^
  symbol:   class Request
  location: class ContentBlockerHandler
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:231: error: package Request does not exist
            Request mRequest = new Request.Builder().url(url).head().build();

                                          ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\content_blocker\ContentBlockerHandler.java:232: error: cannot find symbol

            Response response = null;
            ^
  symbol:   class Response
  location: class ContentBlockerHandler
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\Util.java:201: error: package OkHttpClient does not exist
      OkHttpClient.Builder builder = new OkHttpClient.Builder();
                  ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\Util.java:201: error: package OkHttpClient does not exist

      OkHttpClient.Builder builder = new OkHttpClient.Builder();
                                                     ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\flutter_inappwebview-5.3.2\android\src\main\java\com\pichillilorenzo\flutter_inappwebview\Util.java:210: error: cannot find symbol
      OkHttpClient okHttpClient = builder
      ^
  symbol:   class OkHttpClient
  location: class Util
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
16 errors

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':flutter_inappwebview:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 27s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

配置我有以下配置：
Flutter医生输出：

[√] Flutter (Channel master, 2.3.0-17.0.pre.411, on Microsoft Windows [Version 10.0.19042.1052], locale en-IN)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[√] Chrome - develop for the web
[√] Android Studio (version 4.0)
[√] VS Code (version 1.57.1)
[√] Connected device (3 available)

pubspec.yaml：

environment:
  sdk: ">=2.12.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.1
  get_it:
  google_fonts: ^2.1.0
  shimmer: ^2.0.0
  lottie: ^1.0.1
  stacked: ^2.1.9
  firebase_core: ^1.4.0
  cloud_firestore: ^2.4.0
  firebase_auth: ^3.0.1
  firebase_analytics: ^8.2.0
  pin_code_fields: ^7.2.0
  geolocator: ^7.1.0
  google_maps_flutter: ^2.0.6
  geocoding: ^2.0.0
  url_launcher: ^6.0.6
  rflutter_alert: ^2.0.2
  sms_autofill: ^2.0.0
  carousel_slider: ^4.0.0
  razorpay_flutter: ^1.2.6
  flutter_tts: ^3.1.0
  intl: ^0.17.0
  webview_flutter: ^2.0.8
  flutter_icons:
    git:
      url: https://github.com/adarsh-technocrat/flutter-icons
  timelines: ^0.1.0
  scrollable_positioned_list: ^0.1.10
  in_app_review: ^2.0.2
  share: ^2.0.4
  connectivity: ^3.0.6
  cached_network_image: ^3.0.0
  youtube_player_flutter: ^8.0.0

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_launcher_icons: "^0.9.0"

build.gradle文件：

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.5'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

技术细节：
设备：华硕z01rd（移动式）
操作系统：安卓
安卓10版
已经尝试过的解决方案
我已经在互联网上搜索了很多解决方案，也尝试了一些我自己的技巧，但都没有成功。
以下是相同的列表：
尝试了此处提到的解决方案：https://github.com/sarbagyastha/youtube_player_flutter/issues/490
我试着升级gradle版本。
我试着运行干净的安装。
我尝试将整个应用程序升级到空安全，因此使用 environment: sdk: ">=2.12.0 <3.0.0" 尝试通过pubspec.yaml显式安装Flatter_inappwebview插件。
尝试删除一些我认为可能存在冲突的其他现有依赖项（如webview_Flatter插件）。
已尝试将所有依赖项列表升级到最新版本。

Flutter构建失败：inappwebview错误：包okhttp3不存在

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