undefined reference to 'ncnn::Net::load_param(unsigned char const*)'

[zym1119]

use 'ndk-build' in jni folder got these following errors:

[armeabi-v7a] SharedLibrary : libncnn.so
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:29: error: undefined reference to 'ncnn::Net::load_param(unsigned char const*)'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:38: error: undefined reference to 'ncnn::Net::load_model(unsigned char const*)'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:42: error: undefined reference to 'ncnn::Option::Option()'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:48: error: undefined reference to 'ncnn::set_default_option(ncnn::Option const&)'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:69: error: undefined reference to 'ncnn::Mat::from_pixels(unsigned char const*, int, int, int, ncnn::Allocator*)'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:81: error: undefined reference to 'ncnn::Mat::substract_mean_normalize(float const*, float const*)'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:83: error: undefined reference to 'ncnn::Net::create_extractor() const'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:84: error: undefined reference to 'ncnn::Extractor::input(int, ncnn::Mat const&)'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:87: error: undefined reference to 'ncnn::Extractor::extract(int, ncnn::Mat&)'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:12: error: undefined reference to 'ncnn::UnlockedPoolAllocator::UnlockedPoolAllocator()'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:13: error: undefined reference to 'ncnn::PoolAllocator::PoolAllocator()'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:17: error: undefined reference to 'ncnn::Net::Net()'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:0: error: undefined reference to 'ncnn::UnlockedPoolAllocator::~UnlockedPoolAllocator()'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:0: error: undefined reference to 'ncnn::PoolAllocator::~PoolAllocator()'
/home/zym/AndroidStudioProjects/ncnn1/app/src/main/jni/ncnn_jni.cpp:0: error: undefined reference to 'ncnn::Net::~Net()'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [/home/zym/AndroidStudioProjects/ncnn1/app/src/main/obj/local/armeabi-v7a/libncnn.so] Error 1

in my Android.mk,
LOCAL_C_INCLUDES := $(NCNN_INSTALL_PATH)/include
where
NCNN_INSTALL_PATH := /home/zym/ncnn/build-android-armv7/install
and i got both include and lib in that folder with many header files and libncnn.a

so how can i solve these errors?

[zym1119]

solved. forgot to change LOCAL_MODULE so that it is the same as LOCAL_SRC_FILES'name

before:
LOCAL_MODULE := ncnn
LOCAL_SRC_FILES := ncnn_jni.cpp

after:
LOCAL_MODULE := ncnn_jni
LOCAL_SRC_FILES := ncnn_jni.cpp