集成Firebase时Gradle构建报错的解决求助

错误1：all buildscript {} blocks must appear before any plugins {} blocks #

问题原因 #

Gradle语法强制要求所有buildscript{}块必须放在plugins{}块之前，初始配置顺序颠倒导致编译失败。

临时调整（引发后续错误） #

将buildscript{}移至plugins{}之前，调整后的根目录build.gradle代码如下：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        google()
        mavenCentral()  // Maven Central repository
    }
    dependencies {
        classpath 'com.google.gms:google-services:4.3.13'
    }
}
plugins {
    id 'com.android.application' version '7.3.0' apply false
    id 'com.android.library' version '7.3.0' apply false
}
allprojects {
    repositories {
        google()
        mavenCentral()  // Maven Central repository
    }
}

错误2：Build was configured to prefer settings repositories over project repositories but repository 'Google' was added by build file 'build.gradle' #

问题原因 #

Gradle 7.0+版本默认启用Settings优先仓库配置，禁止在项目build.gradle中通过allprojects{repositories{}}声明仓库，必须统一在settings.gradle中管理全局仓库。

最终解决方案 #

1. 修改根目录settings.gradle

添加dependencyResolutionManagement块统一管理仓库：

pluginManagement {
    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
    }
}
dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
    }
}
rootProject.name = "app_Comic"
include ':app'

2. 修改根目录build.gradle

移除allprojects{}块，并改用现代Gradle语法引入插件：

// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
    id 'com.android.application' version '7.3.0' apply false
    id 'com.android.library' version '7.3.0' apply false
    id 'com.google.gms.google-services' version '4.3.13' apply false
}

说明：直接在plugins块声明google-services插件，替代原buildscript的classpath配置，更符合Gradle 7.x+的规范。

3. 保留app模块build.gradle不变

原app模块配置无需修改，确保com.google.gms.google-services插件已启用即可：

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

// 其余android、dependencies配置保持原样

验证步骤 #

1. 同步Gradle文件
2. 执行Clean Project（Build → Clean Project）
3. 执行Rebuild Project（Build → Rebuild Project）

内容的提问来源于stack exchange，提问作者Conf007