已更新至最新版仍提示Kotlin Gradle插件版本过低的Flutter打包问题

执行flutter build apk时控制台报错：

Your project requires a newer version of the Kotlin Gradle plugin

提示需更新指定路径下build.gradle中的ext.kotlin_version至最新版本，但已将根项目build.gradle中的ext.kotlin_version设置为1.8.20，且尝试过flutter upgrade、flutter clean、flutter pub upgrade操作，Flutter版本为3.7.11，问题仍未解决。

相关配置文件 #

根项目build.gradle #

buildscript {
    ext.kotlin_version = '1.8.20' 
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.1.2'
        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')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

AndroidManifest.xml #

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.signuppage">
    
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

   <application
        android:label="AppName"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

/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: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {

    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'
    }

    namespace "com.example.signuppage"

    defaultConfig {
        applicationId "com.example.signuppage"
        minSdkVersion 21 //flutter.minSdkVersion
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName

        multiDexEnabled true
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.work:work-runtime-ktx:2.7.0'
}

系统信息 #

• 操作系统：Windows 10
• 编辑器：Visual Studio Code

解决办法 #

1. 匹配Gradle插件与Kotlin版本
   当前使用的Gradle插件7.1.2仅兼容最高1.6.21版本的Kotlin插件，与你设置的1.8.20不匹配。修改根项目build.gradle中的Gradle插件版本为7.4.2（兼容Kotlin 1.8.x）：

   classpath 'com.android.tools.build:gradle:7.4.2'
   

2. 更新Gradle wrapper版本
   打开/android/gradle/wrapper/gradle-wrapper.properties，将distributionUrl修改为对应Gradle 7.5版本（匹配7.4.2插件）：

   distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip
   

3. 彻底清理后重新构建
   执行以下命令：

   flutter clean
   rm -rf android/.gradle android/build
   flutter pub get
   flutter build apk
   

4. 检查依赖库兼容性
   项目依赖的androidx.work:work-runtime-ktx:2.7.0可能依赖旧版Kotlin，可升级至兼容版本：

   implementation 'androidx.work:work-runtime-ktx:2.8.1'
   

内容的提问来源于stack exchange，提问作者Henry Davis