Question

在SO上提出了同样的错误问题，但他们的解决方案对我不起作用。我自己无法理解，因此我需要帮助。这是我的build.gradle：

apply plugin: 'com.android.application'

def VUFORIA_SDK_DIR = '../../..'
def JAR_DIR = 'build/java/vuforia'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    sourceSets.main {
        jni.srcDirs = []
        jniLibs.srcDir "src/main/libs"
    }

    defaultConfig {
        applicationId "com.qualcomm.QCARSamples.ImageTargets"
        minSdkVersion 8
        targetSdkVersion 22
        versionCode 200
        versionName "5.0"
    }

    archivesBaseName = rootProject.projectDir.getName()

    buildTypes {
        release {
            minifyEnabled false
            ndk {
                abiFilters "armeabi-v7a"
            }
        }
        debug {
            minifyEnabled false
            debuggable true
            ndk {
                abiFilters "armeabi-v7a"
            }
        }
    }

    task buildNative(type: Exec, description: 'Compile JNI source via NDK') {
        println('compiling jni code with ndk-build...')
        def ndkDir = android.ndkDirectory
        if (System.properties['os.name'].toLowerCase().contains('windows')) {
            commandLine "$ndkDir/ndk-build.cmd",
                '-C', file('src/main/jni').absolutePath
                // Additional ndk-build arguments, such as NDK_DEBUG, can be provided here
        } else {
            commandLine "$ndkDir/ndk-build",
                '-C', file('src/main/jni').absolutePath
                // Additional ndk-build arguments, such as NDK_DEBUG, can be provided here
        }
    }

    task cleanNative(type: Exec, description: 'Clean JNI object files') {
        def ndkDir = android.ndkDirectory
        if (System.properties['os.name'].toLowerCase().contains('windows')) {
            commandLine "$ndkDir/ndk-build.cmd",
                '-C', file('src/main/jni').absolutePath,
                'clean'
        } else {
            commandLine "$ndkDir/ndk-build",
                '-C', file('src/main/jni').absolutePath,
                'clean'
        }
    }

    clean.dependsOn 'cleanNative'

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn buildNative
    }
}

dependencies {
    compile files("$VUFORIA_SDK_DIR/$JAR_DIR/Vuforia.jar")
}

Gradle构建始终因此错误而失败：

错误：任务'：app：buildNative'的执行失败。启动进程'command'null / ndk-build''
时出现问题

可能是什么原因？

Answer 1

我在这里阅读你的内容如下：

@Deprecated

可能会返回null值。我看到的另一个选择是

def ndkDir = android.ndkDirectory

未正确引用您的ndkDir变量，并且您的commandLine执行失败。

commandLine "$ndkDir/ndk-build",

与这两种理论很吻合。

尝试确保在尝试与ndkDir对齐时和/或在commandLine命令之前将变量转换为字符串时不会返回空值。

任务'：app：buildNative'的执行失败

1 个答案: