未配置 NDK。使用 SDK 管理器下载它。首选 NDK 版本是“21.0.6113669”

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【中文标题】未配置 NDK。使用 SDK 管理器下载它。首选 NDK 版本是“21.0.6113669”【英文标题】：NDK not configured. Download it with SDK manager. Preferred NDK version is '21.0.6113669' 【发布时间】：2021-01-16 02:56:30 【问题描述】：

我已经安装了 NDK 版本“21.0.6113669”，但在尝试将项目与 Gradle 文件同步时，仍然出现以下错误：

NDK not configured. Download it with SDK manager. Preferred NDK version is '21.0.6113669'. 
Update NDK version to 21.0.6113669 and sync project

请在我的 build.gradle 下面找到

buildscript 
    repositories 
        jcenter()
        google()
    
    dependencies 
        classpath 'com.android.tools.build:gradle:4.0.0'
    


plugins 
  id "com.android.application"


android 
    compileSdkVersion project.properties.compileSdkVersion.toInteger()
    ndkVersion '21.0.6113669'
        
    dependencies 
        implementation "androidx.annotation:annotation:1.1.0"
        implementation "androidx.viewpager:viewpager:1.0.0"
        implementation "androidx.drawerlayout:drawerlayout:1.1.0"
        implementation project(":terminal-view")
    

    defaultConfig 
        applicationId "com.termux"
        minSdkVersion project.properties.minSdkVersion.toInteger()
        targetSdkVersion project.properties.targetSdkVersion.toInteger()
        versionCode 101
        versionName "0.101"

        externalNativeBuild 
            ndkBuild 
                cFlags "-std=c11", "-Wall", "-Wextra", "-Werror", "-Os", "-fno-stack-protector", "-Wl,--gc-sections"
            
        

        ndk 
            abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
        

    

    signingConfigs 
        debug 
            storeFile file('dev_keystore.jks')
            keyAlias 'alias'
            storePassword 'xrj45yWGLbsO7W0v'
            keyPassword 'xrj45yWGLbsO7W0v'
        
    

    buildTypes 
        release 
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        

        debug 
            signingConfig signingConfigs.debug
        
    

    compileOptions 
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    

    externalNativeBuild 
        ndkBuild 
            path "src/main/cpp/Android.mk"
        
    

    testOptions 
        unitTests 
            includeAndroidResources = true
        
    
    buildToolsVersion '27.0.3'


dependencies 
    testImplementation 'junit:junit:4.13'
    testImplementation 'org.robolectric:robolectric:4.3.1'


task versionName 
  doLast 
    print android.defaultConfig.versionName
  


def downloadBootstrap(String arch, String expectedChecksum, int version) 
    def digest = java.security.MessageDigest.getInstance("SHA-256")

    def localUrl = "src/main/cpp/bootstrap-" + arch + ".zip"
    def file = new File(projectDir, localUrl)
    if (file.exists()) 
        def buffer = new byte[8192]
        def input = new FileInputStream(file)
        while (true) 
            def readBytes = input.read(buffer)
            if (readBytes < 0) break
            digest.update(buffer, 0, readBytes)
        
        def checksum = new BigInteger(1, digest.digest()).toString(16)
        if (checksum == expectedChecksum) 
            return
         else 
            logger.quiet("Deleting old local file with wrong hash: " + localUrl)
            file.delete()
        
    

    def remoteUrl = "https://bintray.com/termux/bootstrap/download_file?file_path=bootstrap-" + arch + "-v" + version + ".zip"
    logger.quiet("Downloading " + remoteUrl + " ...")

    file.parentFile.mkdirs()
    def out = new BufferedOutputStream(new FileOutputStream(file))

    def connection = new URL(remoteUrl).openConnection()
    connection.setInstanceFollowRedirects(true)
    def digestStream = new java.security.DigestInputStream(connection.inputStream, digest)
    out << digestStream
    out.close()

    def checksum = new BigInteger(1, digest.digest()).toString(16)
    if (checksum != expectedChecksum) 
        file.delete()
        //throw new GradleException("Wrong checksum for " + remoteUrl + ": expected: " + expectedChecksum + ", actual: " + checksum)
        throw new FileNotFoundException("Wrong checksum for " + remoteUrl + ": expected: " + expectedChecksum + ", actual: " + checksum)
    


clean 
    doLast 
        def tree = fileTree(new File(projectDir, 'src/main/cpp'))
        tree.include 'bootstrap-*.zip'
        tree.each  it.delete() 
    


task downloadBootstraps()
    doLast 
        def version = 30
        downloadBootstrap("aarch64", "7a90034285c614d23fa450547a5e2aec77d4242c9891ad662bf0c6fd3bd7ef4e", version)
        downloadBootstrap("arm",     "f030869ce9a43f84d88560d7ac5153ee4f7e517bca0b37ab01df3e1acba0fe37", version)
        downloadBootstrap("i686",    "1ea9b63f21602231140d58a5545cfbc6bc2ded56ef2b3c31cba2759d913eef00", version)
        downloadBootstrap("x86_64",  "a50eb8a4dd02b7898bbd4a9653a25c14b56c1737409ce7f64110fd33c2c69382", version)
    


//buildscript 
//    dependencies 
//        classpath 'com.android.tools.build:gradle:4.0.0'
//    
//

afterEvaluate 
  android.applicationVariants.all  variant ->
    variant.javaCompileProvider.get().dependsOn(downloadBootstraps)

我已从笔记本电脑中删除 .gradle 文件夹并重新安装，还尝试了 Android Studio 中的 Invalidate Caches/Restart 选项，但问题仍未解决。 欢迎提出任何建议。

【问题讨论】：

【参考方案1】：

这是build.gradle 在Android 目录中！你必须添加

android 
    ndkVersion '21.3.6528147'
...

到Android/app 中的build.gradle 并从Android/build.gradle 中删除ndk version ...

我在Android/app 中的简单build.gradle 代码：

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"

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


android 
    compileSdkVersion 30
    ndkVersion '21.0.6113669'
    sourceSets 
        main.java.srcDirs += 'src/main/kotlin'
    

    lintOptions 
        disable 'InvalidPackage'
        checkReleaseBuilds false
    

    defaultConfig 
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.test.test"
        minSdkVersion 16
        targetSdkVersion 30
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    

    signingConfigs 
        release 
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword keystoreProperties['storePassword']
        
    
    buildTypes 
        release 
            signingConfig signingConfigs.release
        
    


flutter 
    source '../..'


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

【讨论】：

虽然这可行，但其他机器可能有不同的NDK 版本。我更喜欢在属性文件中或最好在环境变量中。【参考方案2】：

从“https://developer.android.com/ndk”下载 Ndk 并将其解压缩到一个位置，在 local.properties 文件中添加它的路径，如下所示：

ndk.dir=C:\Users\AppData\android-ndk-r23b

并在 build.gradle 文件中更改 ndk 的版本

安卓

ndkVersion '23.1.7779620'
...

Syc Now 并构建您的应用程序

【讨论】：

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