在开始一个新的 Flutter 项目后，我想在我的项目中使用 Firebase，我在项目中添加了以下内容：

• firebase_core并firebase_auth于pubspec.yaml
• google-services.json到对应路径
• classpath 'com.google.gms:google-services:4.3.6'到android/build.gradle
• implementation platform('com.google.firebase:firebase-bom:28.0.0')在“依赖关系”在应用/的build.gradle

到目前为止一切正常，但在将此行添加到app/build.gradle 之后：

• apply plugin: 'com.google.gms.google-services'

添加此行后，即使没有编辑应用程序代码，我也收到以下错误消息：

Launching libmain.dart on sdk gphone x86 arm in debug mode...
Running Gradle task 'assembleDebug'...
FAILURE: Build failed with an exception.
* Where:
Build file 'C:Users1337StudioProjectsteestandroidbuild.gradle' line: 27
* What went wrong:
A problem occurred evaluating root project 'android'.
> A problem occurred configuring project ':app'.
   > org.gradle.internal.metaobject.AbstractDynamicObject$CustomMessageMissingMethodException: Could not find method setVariantDir() for arguments [debug] on task ':app:processDebugGoogleServices' of type com.google.gms.googleservices.GoogleServicesTask.
* 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 4s
Exception: Gradle task assembleDebug failed with exit code 1

这是我的android/build.gradle

buildscript {...}
    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.6'
    }
}
allprojects {...}
rootProject.buildDir = '../build'
subprojects {... }
subprojects {
    project.evaluationDependsOn(':app')
}
task clean(type: Delete) {...}

Ps：通过运行flutter doctor -v一切正常。

回答