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Question:

How to build Android C/C++ version?

Mar 15 '16 at 23:16

I'm using Android Studio 1.5 with Android NDK to build but I can't link to static library. My folder stuct look like this: src --main

----jni

------chilkat

--------include

--------libs

------Android.mk

------Application.mk

------com_example_vinhle_ndksample2_MyNDK.h

------MyLibrary.cpp

Here is content of Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := ChilkatAndroid
LOCAL_SRC_FILES := D:\Tutorials\Android\NDKSample2\app\src\main\jni\chilkat\libs\$(TARGET_ARCH_ABI)\libchilkatAndroid.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_STATIC_LIBRARIES := ChilkatAndroid
LOCAL_C_INCLUDES = D:\Tutorials\Android\NDKSample2\app\src\main\jni\chilkat\include
LOCAL_MODULE := MyLibrary
LOCAL_SRC_FILES := MyLibrary.cpp
include $(BUILD_SHARED_LIBRARY)

And content of MyLibrary.cpp

#include "com_example_vinhle_ndksample2_MyNDK.h"
#include <stdio.h>
#include <C_CkRsa.h>

JNIEXPORT jstring JNICALL Java_com_example_vinhle_ndksample2_MyNDK_getMyString (JNIEnv *env, jobject){
    HCkRsa rsa;
    rsa = CkRsa_Create();
    return (*env).NewStringUTF("So sad");
}

And this is error message appear when build with ndk-build.cmd

jni/MyLibrary.cpp:54: error: undefined reference to 'CkRsa_Create()'
collect2.exe: error: ld returned 1 exit status
make: *** [obj/local/x86_64/libMyLibrary.so] Error 1

Process finished with exit code 2

I think there is some problem with static library that was provided by chilkat android c/c++ because when I did like above with a static library that was built by me, the work is done with no error

Accepted Answer

extern "C" {
#include <c_ckrsa.h>
}