java.lang.UnsatisfiedLinkError：无法从加载器加载native_sample

错误：

Process: com.example.syafiq.opencvoi, PID: 7760
java.lang.UnsatisfiedLinkError: Couldn't load native_sample from loader dalvik.system.PathClassLoader[dexPath=/data/app/com.example.syafiq.opencvoi-13.apk,libraryPath=/data/app-lib/com.example.syafiq.opencvoi-13]: findLibrary returned null
at java.lang.Runtime.loadLibrary(Runtime.java:358)
at java.lang.System.loadLibrary(System.java:526)
at com.example.syafiq.opencvoi.Sample3Native$1.onManagerConnected(Sample3Native.java:79)
at org.opencv.android.AsyncServiceHelper$3.onServiceConnected(AsyncServiceHelper.java:319)
at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1114)
at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1131)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)

sample3Native.java第79行是：

 public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "OpenCV loaded successfully");

                // Load native library after(!) OpenCV initialization
                System.loadLibrary("native_sample");

而AsyncServiceHelper.Java第319行是

mUserAppCallback.onManagerConnected(status);

Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include ../../sdk/native/jni/OpenCV.mk
LOCAL_MODULE    := native_sample
LOCAL_SRC_FILES := jni_part.cpp
LOCAL_LDLIBS +=  -llog -ldl
include $(BUILD_SHARED_LIBRARY)

和application.mk

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi armeabi-v7a
LOCAL_ARM_NEON := true

代码没有错误。我尝试了几种解决方案，但结果仍然相同，这些代码是从开源网站获得的。我对android studio不够好，而且我还在学习。希望你们能帮助我解决这个错误。非常感谢您的帮助和考虑，以帮助我解决我的错误。我感谢您的时间:)