Non-system libraries in linker flags: -lopencv_java3

Issue

In the android.mk file I want to include the OpenCV3 library. so the file looks like this:

android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_EXPORT_C_INCLUDES  := D:\path to\OpenCV-android-sdk\sdk\native\jni\include
include D:\path to\OpenCV-android-sdk\sdk\native\jni\OpenCV.mk

LOCAL_MODULE    := MyLib
LOCAL_SRC_FILES := file1.cpp
LOCAL_SRC_FILES += file2.cpp

OPENGLES_LIB := -lGLESv1_CM
OPENGLES_DEF := -DUSE_OPENGL_ES_1_1
LOCAL_LDLIBS += -lGLESv1_CM -ldl -llog
include $(BUILD_SHARED_LIBRARY)

But when I build the project, I got this warning message:

Android NDK: WARNING:jni/Android.mk:MyLib: non-system libraries in linker flags: -lopencv_java3    
Android NDK:     This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES    
Android NDK:     or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the    
Android NDK:     current module 

How can I solve this issue ?

Solution

If you only use OpenCV from your C++ code, you don't need this libopencv_java.so. To indicate this, add

OPENCV_LIB_TYPE=STATIC

Before including OpenCV.mk.

Some explanations can be found at answers.opencv.org.

Answered By - Alex Cohn