Flutter集成Firebase时Gradle插件找不到问题求助

我按照Firebase官方说明配置Flutter项目集成Firebase，已按要求修改build.gradle文件，并将google-services.json放置在android/app目录下，但构建时始终报错找不到Google Services插件，以下是详细信息：

当前配置文件 #

根目录/build.gradle #

buildscript {
    ext.kotlin_version = '1.7.10'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.3.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

plugins {
    id 'com.google.gms.google-services' version '4.3.15' apply false
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

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

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}

app目录/build.gradle #

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    namespace "com.example.chat"
    compileSdkVersion flutter.compileSdkVersion
    ndkVersion flutter.ndkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        applicationId "com.example.chat"
        minSdkVersion flutter.minSdkVersion
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

plugins {
    id 'com.android.application'
    id 'com.google.gms.google-services'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation platform('com.google.firebase:firebase-bom:32.2.0')
}

google-services.json（放置于android/app目录） #

{
  "project_info": {
    "project_number": "90796036267",
    "project_id": "chatflutter-92032",
    "storage_bucket": "chatflutter-92032.appspot.com"
  },
  "client": [
    {
      "client_info": {
        "mobilesdk_app_id": "1:90796036267:android:54ef4c10ee30c08c5527ee",
        "android_client_info": {
          "package_name": "com.example.chat"
        }
      },
      "oauth_client": [
        {
          "client_id": "90796036267-7lrefr1ltb27cehouki0p77qdlu4q3ei.apps.googleusercontent.com",
          "client_type": 1,
          "android_info": {
            "package_name": "com.example.chat",
            "certificate_hash": "a84f187140210a747f937ed89ceef6213d9cc676"
          }
        },
        {
          "client_id": "90796036267-lh6arnnstp7sumrft3jfnp8ln19bl08f.apps.googleusercontent.com",
          "client_type": 3
        }
      ],
      "api_key": [
        {
          "current_key": "AIzaSyB4AkDYnF-F14Jisg2gn3JrBkjH4LL0sIQ"
        }
      ],
      "services": {
        "appinvite_service": {
          "other_platform_oauth_client": [
            {
              "client_id": "90796036267-lh6arnnstp7sumrft3jfnp8ln19bl08f.apps.googleusercontent.com",
              "client_type": 3
            }
          ]
        }
      }
    }
  ],
  "configuration_version": "1"
}

构建错误信息 #

FAILURE: Build failed with an exception.

* Where:
Build file 'D:\cursoFlutter\chat\android\build.gradle' line: 15

* What went wrong:
Plugin [id: 'com.google.gms.google-services', version: '4.3.15', apply: false] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'com.google.gms.google-services:com.google.gms.google-services.gradle.plugin:4.3.15')
  Searched in the following repositories:
    Gradle Central Plugin Repository

* 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 1s
Exception: Gradle task assembleDebug failed with exit code 1

解决方案 #

问题根源 #

1. Gradle的plugins块依赖pluginManagement配置的仓库查找插件，当前根目录build.gradle未配置该块，导致仅从Gradle Central仓库查找，而Google Services插件不在此仓库中。
2. app目录build.gradle重复声明了com.android.application插件，会引发构建冲突。

修改步骤 #

1. 更新根目录/build.gradle，添加pluginManagement配置：

pluginManagement {
    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}

buildscript {
    ext.kotlin_version = '1.7.10'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.3.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

plugins {
    id 'com.google.gms.google-services' version '4.3.15' apply false
}

// 其余代码保持不变

2. 修复app目录/build.gradle的插件声明，删除重复的com.android.application：

plugins {
    id 'com.google.gms.google-services'
}

3. 执行命令清理缓存并重新构建：

flutter clean
flutter run

内容的提问来源于stack exchange，提问作者Eduardo Machado