Android Studio连接Firebase遇build.gradle报错：buildscript需在plugins块前

错误原因 #

错误提示已明确说明：all buildscript {} blocks must appear before any plugins {} blocks in the script，即**buildscript代码块必须放在所有plugins代码块之前**，你当前根目录的build.gradle将plugins块写在了buildscript块前面，违反了Gradle的语法规则。

修复步骤 #

1. 修正根目录build.gradle #

把buildscript块移到plugins块之前，修正后的代码如下：

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

buildscript {
    repositories {
        google()  // Google's Maven repository
        mavenCentral()  // Maven Central repository
    }
    dependencies {// Add the dependency for the Google services Gradle plugin
        classpath 'com.google.gms:google-services:4.3.15'
    }
}

plugins {
    id 'com.android.application' version '8.0.2' apply false
    id 'com.android.library' version '8.0.2' apply false
}

allprojects {
    repositories {// Make sure that you have the following two repositories
        google()  // Google's Maven repository
        mavenCentral()  // Maven Central repository
    }
}

2. 修正app模块build.gradle #

你当前的app模块代码复制了根目录的内容，这是错误的，app模块需要配置自身的应用信息，正确示例如下：

plugins {
    id 'com.android.application'
    id 'com.google.gms.google-services' // 应用Firebase的Google服务插件
}

android {
    namespace "com.yourpackage.myweb" // 替换为你的应用包名
    compileSdk 34

    defaultConfig {
        applicationId "com.yourpackage.myweb" // 替换为你的应用包名
        minSdk 21
        targetSdk 34
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

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

dependencies {
    // 添加Firebase实时数据库依赖（可根据需求调整）
    implementation 'com.google.firebase:firebase-database:20.3.0'
    
    implementation 'androidx.appcompat:appcompat:1.6.1'
    implementation 'com.google.android.material:material:1.10.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
}

3. 同步项目 #

修改完成后，点击Android Studio右上角的Sync Now按钮，同步Gradle配置即可解决该编译错误。

内容的提问来源于stack exchange，提问作者Niru 15