Question

I have these files in jni folder:

• Android.mk

• Application.mk

• m_lanczos.c

• m_lanczos.h

• sresolution.cpp

and I just want to use my library in resolution.cpp like:

#include"m_lanczos.h"

What else do I have to add in Android.mk? Thank you!

 LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE := super
LOCAL_SRC_FILES := sresolution.cpp 
LOCAL_LDLIBS +=  -llog -ldl

include $(BUILD_SHARED_LIBRARY)

Answer 1

There are two things that could be wrong:

1. You have forgot to compile m_lanczos.c:
   Then your Android.mk should look like this:

   LOCAL_PATH := $(call my-dir)  
   include $(CLEAR_VARS)  
   
   LOCAL_MODULE := super  
   LOCAL_SRC_FILES := sresolution.cpp m_lanczos.c  
   LOCAL_LDLIBS +=  -llog -ldl  
   
   include $(BUILD_SHARED_LIBRARY)  
   

2. m_lanczos is a STATIC_LIBRARY:
   Then you have to build it and include it:

   LOCAL_PATH := $(call my-dir) 
   
   include $(CLEAR_VARS)       
   LOCAL_MODULE := m_lanczos
   LOCAL_SRC_FILES := m_lanczos.c  
   LOCAL_LDLIBS +=           #needed librarys for m_lanczos, probably nothing       
   include $(BUILD_STATIC_LIBRARY) 
   
   include $(CLEAR_VARS)         
   LOCAL_MODULE := super  
   LOCAL_SRC_FILES := sresolution.cpp
   LOCAL_LDLIBS +=  -llog -ldl  
   LOCAL_STATIC_LIBRARIES := m_lanczos
   include $(BUILD_SHARED_LIBRARY)
   

But i think it will be the first one,
i hope that i helped 🙂