Build in Android Studio didn't seem to have produced the native code libraries

[peterswang]

I downloaded this project and imported into a project in Android Studio as a module. Made following changes in build.grade:

compileSdkVersion 21
buildToolsVersion "21.1.2"

defaultConfig {
    applicationId "com.polysfactory.opencvocr"
    minSdkVersion 17
    targetSdkVersion 21
    versionCode 1
    versionName "0.1"
}

Then built the project and tried running this app on a Google Nexus 7 tablet. It crashed on start, with following logical errors:

03-05 23:26:22.154 29413-29413/com.polysfactory.opencvocr D/OpenCV/StaticHelper﹕ Trying to get library list
03-05 23:26:22.158 29413-29413/com.polysfactory.opencvocr E/OpenCV/StaticHelper﹕ OpenCV error: Cannot load info library for OpenCV
03-05 23:26:22.158 29413-29413/com.polysfactory.opencvocr D/OpenCV/StaticHelper﹕ Library list: ""
03-05 23:26:22.159 29413-29413/com.polysfactory.opencvocr D/OpenCV/StaticHelper﹕ First attempt to load libs
03-05 23:26:22.159 29413-29413/com.polysfactory.opencvocr D/OpenCV/StaticHelper﹕ Trying to init OpenCV libs
03-05 23:26:22.159 29413-29413/com.polysfactory.opencvocr D/OpenCV/StaticHelper﹕ Trying to load library opencv_java
03-05 23:26:22.159 29413-29413/com.polysfactory.opencvocr D/OpenCV/StaticHelper﹕ Cannot load library "opencv_java"
03-05 23:26:22.160 29413-29413/com.polysfactory.opencvocr W/System.err﹕ java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.polysfactory.opencvocr-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]] couldn't find "libopencv_java.so"
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at java.lang.Runtime.loadLibrary(Runtime.java:366)
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at java.lang.System.loadLibrary(System.java:989)
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at org.opencv.android.StaticHelper.loadLibrary(StaticHelper.java:54)
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at org.opencv.android.StaticHelper.initOpenCVLibs(StaticHelper.java:85)
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at org.opencv.android.StaticHelper.initOpenCV(StaticHelper.java:29)
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at org.opencv.android.OpenCVLoader.initDebug(OpenCVLoader.java:51)
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at com.polysfactory.opencvocr.OcrApplication.(OcrApplication.java:9)
03-05 23:26:22.165 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at java.lang.reflect.Constructor.newInstance(Native Method)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at java.lang.Class.newInstance(Class.java:1572)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.app.Instrumentation.newApplication(Instrumentation.java:994)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.app.Instrumentation.newApplication(Instrumentation.java:979)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.app.LoadedApk.makeApplication(LoadedApk.java:558)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4491)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.app.ActivityThread.access$1500(ActivityThread.java:144)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5221)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-05 23:26:22.166 29413-29413/com.polysfactory.opencvocr D/OpenCV/StaticHelper﹕ First attempt to load libs fails
03-05 23:26:22.210 29413-29413/com.polysfactory.opencvocr D/CameraBridge﹕ Attr count: 4
03-05 23:26:22.222 29413-29413/com.polysfactory.opencvocr E/art﹕ No implementation found for long com.polysfactory.opencvocr.jni.NativeMarkerDetector.nativeCreateObject(java.lang.String, java.lang.String) (tried Java_com_polysfactory_opencvocr_jni_NativeMarkerDetector_nativeCreateObject and Java_com_polysfactory_opencvocr_jni_NativeMarkerDetector_nativeCreateObject__Ljava_lang_String_2Ljava_lang_String_2)
03-05 23:26:22.223 29413-29413/com.polysfactory.opencvocr D/AndroidRuntime﹕ Shutting down VM
03-05 23:26:22.224 29413-29413/com.polysfactory.opencvocr E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.polysfactory.opencvocr, PID: 29413
java.lang.UnsatisfiedLinkError: No implementation found for long com.polysfactory.opencvocr.jni.NativeMarkerDetector.nativeCreateObject(java.lang.String, java.lang.String) (tried Java_com_polysfactory_opencvocr_jni_NativeMarkerDetector_nativeCreateObject and Java_com_polysfactory_opencvocr_jni_NativeMarkerDetector_nativeCreateObject__Ljava_lang_String_2Ljava_lang_String_2)
at com.polysfactory.opencvocr.jni.NativeMarkerDetector.nativeCreateObject(Native Method)
at com.polysfactory.opencvocr.jni.NativeMarkerDetector.(NativeMarkerDetector.java:12)
at com.polysfactory.opencvocr.MainActivity.onResume(MainActivity.java:68)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1241)
at android.app.Activity.performResume(Activity.java:6019)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2940)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2982)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Looks like there is something else I need to do, in order to bet the native libraries built?

Thx in advance for any help on this.

[GrantMStevens]

I'm encountering the same problem here. I'm not really an Android dev, so any help would be great.