Android 4.2 ndk: library loading crash: load_library(linker.cpp:750) || soinfo_link_image || libhoudini.so || opencv

Question

I am using a native library that includes opencv. The library builds well and works well in all devices and emulators, but not on Android 4.2 ones. It crashes on System.loadLibrary("mylib");.

The library is built for armeabi-v7a armeabi x86 mips (I see in the jnilibs folder that all the so files were generated)

I am stuck on this bug because I couldn't find any answer on the internet which could explain my problem.

Cannot load library: soinfo_link_image(linker.cpp:1635): could not load library "libopencv_java.so", log trace:

1755-1755/com.ex.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
   java.lang.UnsatisfiedLinkError: Cannot load library: soinfo_link_image(linker.cpp:1635): could not load library "libopencv_java.so" needed by "libmylib.so"; caused by load_library(linker.cpp:745): library "libopencv_java.so" not found
           at java.lang.Runtime.loadLibrary(Runtime.java:371)
           at java.lang.System.loadLibrary(System.java:535)
           at com.ex.app.core.MyApplication.initVippAsync(MyApplication.java:198)
           at com.ex.app.core.MyApplication.onCreate(MyApplication.java:100)
           at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1000)
           at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4391)
           at android.app.ActivityThread.access$1300(ActivityThread.java:141)
           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1294)
           at android.os.Handler.dispatchMessage(Handler.java:99)
           at android.os.Looper.loop(Looper.java:137)
           at android.app.ActivityThread.main(ActivityThread.java:5039)
           at java.lang.reflect.Method.invokeNative(Native Method)
           at java.lang.reflect.Method.invoke(Method.java:511)
           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
           at dalvik.system.NativeStart.main(Native Method)

Android.mk:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
OPENCV_INSTALL_MODULES:=on
include /Users/ahmed/Documents/openCv4android/OpenCV-2.4.10-android-sdk/sdk/native/jni/OpenCV.mk
LOCAL_MODULE    := mylib
LOCAL_LDLIBS += -llog -ldl
LOCAL_SRC_FILES := myFile.c
include $(BUILD_SHARED_LIBRARY)

Application.mk:

APP_ABI := armeabi-v7a armeabi x86 mips
APP_PLATFORM := android-16

Answer 1

I found my answer. It's two steps:

1/ If you're using an emulator Genymotion, with an Android 4.2.2, you will have a missing library, caused by one of the updates of Genimotion. See this. Solution : (1)> download the following zip file: here. (2)> simply drag and drop it to your emulator. (3)> restart your emulator.

2/ In the Android 4.2 the OS has problems to find paths to jni libraries shipped in the apk. For example in my case, I am using a jni library that uses the openCV library. For every device and android version calling System.loadLibrary("mylib"); worked well and mylib loaded automatically the opencv library. For the Android 4.2, as @Chris said in his comment, I loaded openCV explicitly, so :

System.loadLibrary("opencv_java");
System.loadLibrary("mylib");