Flutter Android接入Firebase时Gradle构建失败求助

错误信息 #

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mapDebugSourceSetPaths'.
> Error while evaluating property 'extraGeneratedResDir' of task ':app:mapDebugSourceSetPaths'
   > Failed to calculate the value of task ':app:mapDebugSourceSetPaths' property 'extraGeneratedResDir'.
      > Querying the mapped value of provider(java.util.Set) before task ':app:processDebugGoogleServices' has completed is not supported

* 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 59s
Exception: Gradle task assembleDebug failed with exit code 1

当前配置文件 #

/android/build.gradle #

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

    dependencies {
        classpath 'com.android.tools.build:gradle:7.3.0'
        classpath 'com.google.gms:google-services:4.3.10'
        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
}

/android/app/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: 'com.google.gms.google-services'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    // ... (other configurations)

    buildTypes {
        release {
            // ... (other configurations)
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    // ... (other dependencies)
}

解决方案 #

1. 调整插件应用顺序 #

将com.google.gms.google-services插件的应用移到flutter.gradle之后，确保flutter插件生成必要资源后再执行google-services的处理：

修改/android/app/build.gradle的插件顺序：

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
apply plugin: 'com.google.gms.google-services' // 移至此处

2. 升级google-services插件版本 #

旧版本插件与Gradle 7.x存在兼容性问题，升级到4.3.15或更高版本：

修改/android/build.gradle中的依赖：

classpath 'com.google.gms:google-services:4.3.15'

3. 移除subprojects的evaluationDependsOn配置 #

该配置会打乱Gradle任务依赖顺序，注释或删除以下代码：

// subprojects {
//     project.evaluationDependsOn(':app')
// }

4. 清理缓存并重新构建 #

执行命令清理缓存后重新构建：

flutter clean
rm -rf android/.gradle
flutter run

内容的提问来源于stack exchange，提问作者Shivang Srivastava