Flutter项目Android端Gradle构建失败求助

先梳理下你当前配置里的几个关键问题：

• 错用了gradle-kotlin插件，应该用标准的Android Gradle插件
• Kotlin版本2.0.20太高，和当前Flutter版本不兼容
• 没正确引入Flutter Gradle插件，替代过时的app_plugin_loader
• 硬编码了版本号，没用到Flutter配置的数值

直接上修复后的配置文件 #

1. 修改android/build.gradle #

buildscript {
    ext.kotlin_version = '1.9.20'
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        // 替换成标准Android Gradle插件，版本和Flutter兼容
        classpath 'com.android.tools.build:gradle:8.2.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        // 添加官方Flutter Gradle插件，替代过时的app_plugin_loader
        classpath 'dev.flutter:flutter-gradle-plugin:2.0.0'
    }
}

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. 修改app/build.gradle #

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    // 引入Flutter Gradle插件，解决过时问题
    id 'dev.flutter.flutter-gradle-plugin'
//    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 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') ?: '1'
def flutterVersionName = localProperties.getProperty('flutter.versionName') ?: '1.0'

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    namespace 'com.semenov.canada'

    compileSdkVersion 34

    defaultConfig {
        applicationId "com.semenov.canada"
        minSdkVersion 21
        targetSdkVersion 34
        // 用Flutter提供的版本号，不要硬编码
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        manifestPlaceholders = [applicationName: "com.semenov.canada"]
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword keystoreProperties['storePassword']
        }
    }

    buildTypes {
        release {
            signingConfig signingConfigs.release
        }
    }
}

// 恢复Flutter配置，指向你的项目根目录
flutter {
    source '../'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

最后执行这些操作 #

1. 终端运行flutter clean清空旧缓存
2. 打开Android Studio点击Gradle同步按钮，重新同步项目
3. 如果还是有问题，执行flutter upgrade升级到最新稳定版Flutter SDK

内容的提问来源于stack exchange，提问作者SKV