Opencv4android:non-system libraries in linker flags:-lopencv_java Error resolution

Recently engaged in an old code, found OpenCV to 2.4. After 11, the previous MK file was not used and reported a pile of errors.

First, as mentioned above, local_ldlibs + =-lm-llog this sentence + = must not be wrongly written: =. In addition, a bug is reported:

Android NDK:WARNING:APP_PLATFORM android-17 is larger than android:minsdkversion in./androidmanifest.xmlandroid NDK: Warning:jni/android.mk:processimg:non-system libraries in linker flags:-lopencv_javaandroid Ndk:this was likely to result in incorrect builds. Try using local_static_librariesandroid ndk:or local_shared_libraries instead to list the library dependencies of the Android ndk:current module[armeabi-v7a] compile++ thumb:processimg <= detectface_jni.cppjni/detectface_jni.cpp:i n function ' _jstring* java_org_yan_processlib_libprocessimg_processiplimg (jnienv*, Jobject, jintarray, int, int) ': JNI /detectface_jni.cpp:97:44:warning:converting ' false ' to pointer type for argument 2 of ' jint* _jnienv::getintarrayelemen                                            TS (Jintarray, jboolean*) ' [-wconversion-null] cbuf = Env->getintarrayelements (buf, false); ^jni/detectface_jni.cpp:in function ' _jstring* java_org_yan_processlib_libprocessimg_processstaticimg (JN Ienv*, Jobject, jintarray, int, int) ': Jni/detectface_jni.cpp:131:44:warning:converting ' false ' to pointer type for Argumen T 2 of ' jint* _jnienv::getintarrayelements (Jintarray, jboolean*) ' [-wconversion-null] cbuf = env->                                            Getintarrayelements (buf, false); ^[ARMEABI-V7A] compile++ thumb:processimg <= copytoassets.cpp[armeabi-v7a] compile++ thumb:processimg <= DETECTFACE.CPP[ARMEABI-V7A] sharedlibrary:libprocessimg.so/users/yanzi/work/android-ndk-r10d/toolchains/ arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/. /lib/gcc/arm-linux-androideabi/4.8/. /.. /.. /.. /arm-linux-androideabi/bin/ld:warning:hidden symbol ' __aeabi_atexit ' in/users/yanzi/work/android-ndk-r10d/sources /CXX-STL/GNU-LIBSTDC++/4.8/LIBS/ARMEABI-V7A/THUMB/LIBGNUSTL_STATIC.A (ATEXIT_ARM.O) is referenced by dso/users/ yanzi/work/opencv-android-sdk/sdk/native/jni/. /LIBS/ARMEABI-V7A/LIBOPENCV_JAVA.SO[ARMEABI-V7A] Install:libProcessImg.so = libs/armeabi-v7a/libprocessimg.so 

Although the so file was generated, it was installed, but reported a Non-system libraries in linker flags:-lopencv_java error, compiled so file only about 330KB, Theoretically this so should be around 4.5M. Run know find libopencv.so found. This is the Mk file that produces this error:

Local_path: = $ (call My-dir) include $ (clear_vars) ifeq ("$ (wildcard $ (Opencv_mk_path))", "") #try to the load opencv.mk from Def Ault Install location #include $ (toolchain_prebuilt_root)/user/share/opencv/opencv.mk include/users/yanzi/work/ Opencv-android-sdk/sdk/native/jni/opencv.mkelse include $ (opencv_mk_path) endiflocal_ldlibs    + =-lm-llog LOCAL_ MODULE    

The correct MK file should be as follows:

Local_path: = $ (call My-dir) include $ (clear_vars) opencv_install_modules:=onopencv_camera_modules:=offopencv_lib_ Type:=staticifeq ("$ (wildcard $ (Opencv_mk_path))", "") #try to the load OPENCV.MK from the default install location #include $ (TOOL Chain_prebuilt_root)/user/share/opencv/opencv.mk include/users/yanzi/work/opencv-android-sdk/sdk/native/jni/ Opencv.mkelse include $ (opencv_mk_path) endiflocal_module    : = processimg local_src_files: = Detectface_jni.cpp src/ CopyToAssets.cpp Src/detectface.cpplocal_ldlibs    

The problem is:

Opencv_install_modules:=on
Opencv_camera_modules:=off
Opencv_lib_type:=static

These three sentences, especially the opencv_lib_type:=static is the key, not this sentence compiled so or to rely on libopencv_java.so. And this sentence must be placed before the include Opencv.mk file . Remember, remember!

Welcome to join Opencv4android 3 Group: 272250397 Remarks: Yanzi

Opencv4android:non-system libraries in linker flags:-lopencv_java Error resolution