Android NDK共享库UnsatisfiedLinkError OpenGLESv2

Question

I'm getting "cannot locate symbol" errors to OpenGLESv2 functions when I launch my app.

02-28 12:49:43.443: E/art(1258): dlopen("/data/app-lib/com.xxx.xxx-2/libmy_ndk.so", RTLD_LAZY) failed: dlopen failed: cannot locate symbol "glGenRenderbuffers" referenced by "libmy_ndk.so"...

The library structure is as follows:

C++ Library compiled with toolchain -> libmy_ndk.so
JNI Code calls C++ Library -> libmy.so

If I put the OpenGL functions in the JNI code and discard the C++ library entirely, it works as expected. But for some reason it's not dynamically linking OpenGL at runtime if I'm using the prebuilt C++ shared library.

My make file looks like this:

include $(CLEAR_VARS)
LOCAL_CFLAGS := -std=gnu++11
LOCAL_MODULE := my_ndk
LOCAL_SRC_FILES := libmy_ndk.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_EXPORT_LDLIBS := -lGLESv2
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE    := my
LOCAL_CFLAGS := -std=gnu++11
LOCAL_SRC_FILES := ndk.cpp
LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog -landroid -lz
LOCAL_SHARED_LIBRARIES := my_ndk
include $(BUILD_SHARED_LIBRARY)

I'm not getting any compile errors, and everything but the OpenGL functions work. I tried using LOCAL_LDLIBS := -lGLESv2 for both the prebuilt and shared libraries, and then changed it to LOCAL_EXPORT_LDLIBS as shown above, and no combination of those seem to work either.

SOLUTION:

The problem was the compilation of the C++ library with the toolchain. The libGLESv2.so it was initially linking against was not the same version that was loaded on the device, which was causing the conflict when loading.

Answer 1

There are different folders for different architecture, There is a high possibility that you have not provided your Native Libraries for a specific architecture that you are currently debugging on.

Kindly copy your .so Libs in these folders aswell.
I hope this helps.

Please add the feature as required from the list below in your Manifest.xml file :

<-- require OpenGL ES version 1.0 (default) -->
<uses-feature android:glEsVersion="0x00010000"/>

<-- require OpenGL ES version 1.1 -->
<uses-feature android:glEsVersion="0x00010001"/>

<-- require OpenGL ES version 2.0 -->
<uses-feature android:glEsVersion="0x00020000"/>

<-- require OpenGL ES version 3.0 -->
<uses-feature android:glEsVersion="0x00030000"/>

:
Please go through This link : NDK OpenGL undefined reference to glVertexPointer