CODEWITHSUNDEEP
javaandroidopencvandroid-studioandroid-ndk
user3504563
user3504563

Reputation: 39

ndk.dir error in Android Studio

I was trying to use opencv library, so I imported one of its projects in Android Studio and when I tried to run it I got this error:

Error:Execution failed for task ':openCVSamplefacedetection:compileDebugNdk'. NDK not configured. Download the NDK from http://developer.android.com/tools/sdk/ndk/.Then add ndk.dir=path/to/ndk in local.properties. (On Windows, make sure you escape backslashes, e.g. C:\ndk rather than C:\ndk)

So I downloaded the ndk and I addes this line to the local.properties file where it became:

sdk.dir=C\:\\Users\\skoon\\AppData\\Local\\Android\\sdk
ndk.dir=C\:\\Users\\skoon\\AppData\\Roaming\\IDM\\android-ndk-r10d

but I still got this error which I didn't understand:

Error:Execution failed for task ':openCVSamplefacedetection:compileDebugNdk'. com.android.ide.common.internal.LoggedErrorException: Failed to run command: C:\Users\skoon\AppData\Roaming\IDM\android-ndk-r10d\ndk-build.cmd NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=C:\Users\skoon\Downloads\Compressed\OpenCV-2.4.10-android-sdk\OpenCV-2.4.10-android-sdk\samples\face-detection\openCVSamplefacedetection\build\intermediates\ndk\debug\Android.mk APP_PLATFORM=android-14 NDK_OUT=C:\Users\skoon\Downloads\Compressed\OpenCV-2.4.10-android-sdk\OpenCV-2.4.10-android-sdk\samples\face-detection\openCVSamplefacedetection\build\intermediates\ndk\debug\obj NDK_LIBS_OUT=C:\Users\skoon\Downloads\Compressed\OpenCV-2.4.10-android-sdk\OpenCV-2.4.10-android-sdk\samples\face-detection\openCVSamplefacedetection\build\intermediates\ndk\debug\lib APP_ABI=all Error Code: 2 Output: make.exe: *** No rule to make target 'C:\Users\skoon\Downloads\Compressed\OpenCV-2.4.10-android-sdk\OpenCV-2.4.10-android-sdk\samples\face-detection\openCVSamplefacedetection\build\intermediates\ndk\debug\obj/local/arm64-v8a/objs/detection_based_tracker/C_\Users\skoon\Downloads\Compressed\OpenCV-2.4.10-android-sdk\OpenCV-2.4.10-android-sdk\samples\face-detection\openCVSamplefacedetection\src\main\jni', needed by `C:\Users\skoon\Downloads\Compressed\OpenCV-2.4.10-android-sdk\OpenCV-2.4.10-android-sdk\samples\face-detection\openCVSamplefacedetection\build\intermediates\ndk\debug\obj/local/arm64-v8a/objs/detection_based_tracker/C_\Users\skoon\Downloads\Compressed\OpenCV-2.4.10-android-sdk\OpenCV-2.4.10-android-sdk\samples\face-detection\openCVSamplefacedetection\src\main\jni\DetectionBasedTracker_jni.o'. Stop.

I didn't change anything in the code, so what should I do? do I need to change or add any variables to point to the ndk?

P.S. This is my first time trying to build Android application so I don't have any experience.

Thank you in advance.

UPDATE:

To import the project I just used import project from file, then I synced the gardle, and run the project. the package that I downloaded from opencv was the Android one, and I tried to use the face detection sample. when I run it I got the error above.

Upvotes: 1

Views: 13739

Answers (3)

Shyam Kumar
Shyam Kumar

Reputation: 919

Install NDK in your SDK manager, if you already installed open app's "build.gradle" replace these lines

sourceSets { main { jni.srcDirs = ['src/main/jni', 'src/main/jniLibs/', 'src/main/jni/'] } }

to

sourceSets.main { jniLibs.srcDir 'src/main/jniLibs' // mention your JNI lib path(where ".so" files contains) jni.srcDirs = [] //disable automatic ndk-build call }

I'm tried to configure OpenCV and its fixed

Upvotes: 0

Ha Dang
Ha Dang

Reputation: 1238

You need to setup OpenCV librairies for your project. You can follow the instruction here.

Upvotes: 1

quanhua92
quanhua92

Reputation: 66

OpenCV sample projects haven't support gradle officially. I think it will be easier if you start a new project and configure it to work as in examples. I have implemented a tutorial project using Android Studio + NDK + OpenCV. You may have a look. https://github.com/quanhua92/NDK_OpenCV_AndroidStudio

Upvotes: 0

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