Flutter集成Firebase时Android根项目build.gradle执行错误求助

错误原因分析 #

• 根build.gradle结构违规：你将plugins块嵌套在了buildscript内部，Gradle脚本不允许这种嵌套结构，plugins块必须放在脚本最外层。
• 插件ID拼写错误：app/build.gradle里的com.google.gms.google-servides多了一个字母d，正确ID为com.google.gms.google-services。
• 重复声明插件：根build.gradle同时用classpath和plugins两种方式声明Google Services插件，导致配置冲突。

修复后的配置代码 #

1. 根目录build.gradle（android/build.gradle） #

// 将plugins块移至最外层，禁止嵌套在buildscript内
plugins {
    id("com.google.gms.google-services") version "4.4.0" apply false
}

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"
        // 移除重复的google-services classpath，已通过plugins方式声明
    }
}

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. app/build.gradle（android/app/build.gradle） #

plugins {
    id "com.android.application"
    id "kotlin-android"
    id "dev.flutter.flutter-gradle-plugin"
    // 修正插件ID的拼写错误
    id "com.google.gms.google-services"
}

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

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

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

android {
    namespace "com.example.myapp"
    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.deal_diligence"
        minSdkVersion flutter.minSdkVersion
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation(platform("com.google.firebase:firebase-bom:32.3.1"))
    // 可在此添加具体Firebase依赖，比如：
    // implementation 'com.google.firebase:firebase-analytics-ktx'
}

验证步骤 #

1. 保存两个修改后的build.gradle文件。
2. 执行flutter clean清理项目缓存。
3. 重新运行flutter run即可正常构建。

内容的提问来源于stack exchange，提问作者LostTexan