[Flutter]打包APK报错The binary version of its metadata is 1.9.0, expected version is 1.6.0._android the binary version of its metadata is 1.9.

问题：

flutter run运行项目没任何问题，但打包时终端会报错，最后打包还能成功。虽然能打包，不过这个错误警告还是要处理。

e: /Users/gamin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.9.23/dbaadea1f5e68f790d242a91a38355a83ec38747/kotlin-stdlib-1.9.23.jar!/META-INF/kotlin-stdlib-jdk8.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.

Flutter Fix

│ [!] Your project requires a newer version of the Kotlin Gradle plugin.                           

│ Find the latest version on https://kotlinlang.org/docs/releases.html#release-details, then update

│ /Users/gamin/Documents/sanqi/app_teleprompter/android/build.gradle:                             

│ ext.kotlin_version = '<latest-version>'

在stackoverflow上有这个问题

https://stackoverflow.com/questions/67699823/module-was-compiled-with-an-incompatible-version-of-kotlin-the-binary-version-o/74425347#74425347

修复：

1.在项目级android/build.gradle如下配置

buildscript {
    ext.kotlin_version = '1.9.23' // 定义一个扩展属性来指定 Kotlin 的版本
    repositories {
        google()
        mavenCentral()
    }
 
    dependencies {
        classpath 'com.android.tools.build:gradle:8.1.3'
        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
}

2.在settings.gradle中注意com.android.application和org.jetbrains.kotlin.android指定的版本

plugins {
	...
    id "com.android.application" version "8.1.3" apply false 
    id "org.jetbrains.kotlin.android" version "1.9.23" apply false
}

3.在android/gradle/wrapper/gradle-wrapper.properties指定Gradle Wrapper的版本

...
# distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.3-all.zip
distributionUrl = https\://services.gradle.org/distributions/gradle-8.4-bin.zip

4.配置的版本需要对应

比如，文档中说Android Gradle插件版本为8.3时所需的最低Gradle版本为8.4。这时，你com.android.tools.build:gradle配置8.3.x后Gradle Wrapper版本就要改成gradle-8.4-bin.zip。

本来上面我使用版本8.3.1，但同步时报错，就改成8.1.3了。

The project is using an incompatible version (AGP 8.3.1) of the Android Gradle plugin.  Latest supported version is AGP 8.1.3

注意：有时遇到同步问题，就去Android Studio中去同步，会有错误提示。在VS Code中运行时，看不到详细提示。

5.相关网站

其中ext.kotlin_version版本信息查询：

Kotlin releases | Kotlin Documentation

com.android.tools.build版本信息查询：

https://maven.google.com/web/index.html?q=com.android.tools.build

https://mvnrepository.com/artifact/com.android.tools.build/gradle

Android Gradle插件版本配置说明：

https://developer.android.com/build/releases/gradle-plugin?hl=zh-cn#updating-gradle

distributionUrl查询：

https://services.gradle.org/distributions/

6.重新打包APK

$ flutter clean
$ flutter pub get
$ flutter run
$ flutter build apk