java.lang.UnsatisfiedLinkError when using with android 5.0

Question

I'm building an android application. Encode and decode using Opus codec. I'm using native code from here http://www.opus-codec.org/ and the wrapper from here https://github.com/jitsi/libjitsi/tree/master/src/native/opus . In Android 4.0+, I created .so file and run, everything is OK. but in Android 5.0, It crash when I call native method. Here is the detail of crash:

 java.lang.UnsatisfiedLinkError: No implementation found for long my.package.name.codec.Opus.encoder_create(int, int) (tried Java_my_package_name_codec_Opus_encoder_1create and Java_my_package_name_codec_Opus_encoder_1create__II)

I also search a lot but can't find the root cause and nobody has a same problem with me. below is my mk file, I think it useful.

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

MY_MODULE_DIR       := opus

LOCAL_MODULE        := $(MY_MODULE_DIR)
LOCAL_SRC_FILES     := $(wildcard ( libopus/src/*.c \
    libopus/celt/*.c \
    libopus/celt/arm/*.c \
    libopus/silk/*.c \
    libopus/silk/arm/*.c \
    libopus/include/*.c \
    libopus/silk/fixed/*.c \
    my_package_name_codec_Opus.c ))

LOCAL_C_INCLUDES    := \
    libopus/src \
    libopus/include \
    libopus/silk \
    libopus/silk/fixed \
    libopus/silk/arm \
    libopus/celt \
    libopus/celt/arm \
    libopus \

LOCAL_CFLAGS        := -DNULL=0 -DSOCKLEN_T=socklen_t -DLOCALE_NOT_USED -D_LARGEFILE_SOURCE=1 -D_FILE_OFFSET_BITS=64
LOCAL_CFLAGS    += -Drestrict='' -D__EMX__ -DOPUS_BUILD -DFIXED_POINT -DUSE_ALLOCA -DHAVE_LRINT -DHAVE_LRINTF -O3 -fno-math-errno
LOCAL_CPPFLAGS      := -DBSD=1 
LOCAL_CPPFLAGS          += -ffast-math -O3 -funroll-loops

include $(BUILD_SHARED_LIBRARY)

PS: if you need more files, please let me know.

Answer 1

After spending a ridiculous amount of time debugging the same issue myself, enabling checkjni, running javah in order to make sure my headers match my java code, compiling with PIE - I eventually found the issue.

Android 5.0 has added opus support. This means the system already comes with a libopus.so file. When you run loadlibrary - it isn't your compiled version that's loaded, but rather the libopus.so that was bundled with Android.

Just change your library name to libmyopus.so, and this should solve your problem. MY_MODULE_DIR := myopus and ofcourse update your System.loadlibrary call as well.