Execution failed for ':app:ndkBuild'. Process 'command ndk-build.cmd' finished with non-zero exit value 2

Issue

I have been stuck on this problem for 2 days and have tried out all possible solutions given on stackoverflow. Below is my build.gradle file:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    sourceSets.main.jni.srcDirs = []
    sourceSets.main.jniLibs.srcDir 'src/main/libs'

defaultConfig {
    applicationId "com.example.anannyauberoi.testingcam"
    minSdkVersion 15
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    ndk {
        moduleName "app"
        cFlags "-std=c++11 -fexceptions"
        ldLibs "log"
        stl "gnustl_shared"
        abiFilter "armeabi-v7a"
    }
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
sourceSets { main { jni.srcDirs = []
    res.srcDirs = ['src/main/res']
    jniLibs.srcDirs=['src/main/libs']
} }
//sourceSets.main.jni.srcDirs = []
// disable automatic ndk-build call, which ignore our Android.mk

task ndkBuild(type: Exec, description: 'Compile JNI source via NDK') {
    commandLine "C:/Users/Anannya-Uberoi/AppData/Local/Android/sdk/ndk-bundle/ndk-build.cmd",
            'NDK_PROJECT_PATH=build/intermediates/ndk',
            'NDK_LIBS_OUT=src/main/jniLibs',
            'APP_BUILD_SCRIPT=src/main/jni/Android.mk',
            'NDK_APPLICATION_MK=src/main/jni/Application.mk'
}
tasks.withType(JavaCompile) {
    compileTask -> compileTask.dependsOn ndkBuild
}

tasks.all { task ->
    if (task.name.startsWith('compile') && task.name.endsWith('Ndk')) {
        task.enabled = false
    }
}

// call regular ndk-build(.cmd) script from app directory

}
    //Modify the below set of code to the ndk-build.cmd location in your computer.

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile project(':openCVLibrary249')
}

I have already tried all possible solutions- deleting the obj folder in the build folder, trying to avoid automatic Android.mk call by setting the sourceSets.main, trying to avoid the compileDebugNdk task from getting called. I also do not have any cmake.txt files. I cannot seem to get over the problem.

I have used Android Studio 2.3.2 and 2.1.1 and the problem has persisted in both of them.

Any help would be appreciated.

Solution

You should use the latest Android Studio, 2.3.2 is OK. It has integrated externalNativeBuild in android gradle plugin, so you don't need the tricks with custom gradle task.

I could not actually test the build.gradle script below, so please forgive me any typos:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"

defaultConfig {
    applicationId "com.example.anannyauberoi.testingcam"
    minSdkVersion 15
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    externalNativeBuild {
        ndkBuild {
            targets "app"
            cppFlags "-std=c++11 -fexceptions"
            arguments "APP_STL=gnustl_shared"
            abiFilters "armeabi-v7a"
        }
    }
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
sourceSets { main { 
  res.srcDirs = ['src/main/res']
} }

externalNativeBuild {
    ndkBuild {
        path "src/main/jni/Android.mk"
    }
}

    //Modify the below set of code to the ndk-build.cmd location in your computer.

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile project(':openCVLibrary249')
}

Answered By - Alex Cohn