Flutter集成Firebase Auth遇依赖错误：找不到com.google.gms.google-services:4.3.15

问题分析 #

错误提示Could not find com.google.gms.google-services:4.3.15:，核心问题有两点：

• 模块目录（app/build.gradle）错误复制了根目录的完整buildscript配置，导致依赖解析逻辑混乱
• 旧版本的google-services插件与当前gradle版本（7.2.0）存在兼容性冲突

修复步骤 #

1. 修正根目录build.gradle配置 #

保留根目录的buildscript结构，将google-services插件版本升级到适配gradle 7.2.0的稳定版：

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

    dependencies {
        // 升级至兼容gradle 7.x的版本
        classpath 'com.google.gms.google-services:4.4.0'
        classpath 'com.android.tools.build:gradle:7.2.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

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
}

2. 修正模块目录（app/build.gradle）配置 #

模块目录无需重复根目录的buildscript配置，仅保留app模块专属配置并应用google-services插件：

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'dev.flutter.flutter-gradle-plugin'
    // 应用google-services插件
    id 'com.google.gms.google-services'
}

android {
    namespace "com.example.app_layout"
    compileSdkVersion 33

    defaultConfig {
        applicationId "com.example.app_layout"
        minSdkVersion 21
        targetSdkVersion 33
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    // Firebase依赖会通过google-services插件自动引入，无需手动添加
}

3. 清理并重建项目 #

• 执行Flutter命令清除缓存并重新获取依赖：

flutter clean
flutter pub get

• 在Android Studio中点击File -> Invalidate Caches... -> Invalidate and Restart，清除IDE缓存后重启

关键注意事项 #

• google-services插件仅需在根目录build.gradle的buildscript中声明依赖，在app模块build.gradle中通过插件ID应用即可，禁止重复配置buildscript
• 确保google-services.json文件放在android/app/目录下，文件名无拼写错误
• 保持gradle插件、kotlin版本与google-services版本的兼容性，避免使用过于老旧的插件版本

内容的提问来源于stack exchange，提问作者BabouG