CODEWITHSUNDEEP
androidandroid-ndk
Chandu Babu N
Chandu Babu N

Reputation: 21

Android native code building with NDK

I am trying to buikd a Android native module inside the Android build system using NDK. My module builds properly with out any error while building with Android module make command. But when I try the use NDK build setup I am facing problem with android system include files. My module structure is :

android
       |
       external
              |
              MyModule
                     |
                     jni --> Android.mk
                     mysharedobj --> Android.mk

My Native module includes many android includes such as

#include <JNIHelp.h>
#include "android_runtime/AndroidRuntime.h"
#include <gui/Surface.h>
#include <gui/ISurface.h>

With the help of NDK docs i was able to resolve the include errors, but i am facing somre error, eg: 

jni/com_my_module_NativeInterface.cpp:3:21: fatal error: JNIHelp.h: No such file or directory compilation terminated.

-->For resolving the JNIHelp.h include error, i had added the following line in Android.mk

LOCAL_C_INCLUDES += \
    $(LOCAL_PATH)/../../../libnativehelper/include/nativehelper

After this again one more error,

jni/../../../libnativehelper/include/nativehelper/JNIHelp.h:27:24: fatal error: cutils/log.h: No such file or directory compilation terminated.

--> To solve above error i had modified Android.mk

LOCAL_C_INCLUDES += \
    $(LOCAL_PATH)/../../../libnativehelper/include/nativehelper \
    $(LOCAL_PATH)/../../../system/core/include \

After this again one more error

/home/user/android-ndk-r8e/platforms/android-3/arch-arm/usr/include/linux/uio.h:18:8: error: redefinition of 'struct iovec'
jni/../../../system/core/include/cutils/uio.h:33:8: error: previous definition of 'struct iovec'

How to build a native module successfully that uses android system include files? Please help me.

Upvotes: 2

Views: 8145

Answers (2)

bonnyz
bonnyz

Reputation: 13548

I'm not sure, but try to put the flag -DHAVE_SYS_UIO_H on your LOCAL_CFLAGS:

LOCAL_CFLAGS += -DHAVE_SYS_UIO_H

Upvotes: 5

draganstankovic
draganstankovic

Reputation: 5436

You should use LOCAL_LDLIBS instead of adding ndk dependencies to LOCAL_C_INCLUDES. The example below is from my Android.mk:

LOCAL_LDLIBS := -L$(NDK_PLATFORMS_ROOT)/$(TARGET_PLATFORM)/arch-arm/usr/lib -L$(LOCAL_PATH) -llog -lz -lm

Checkout docs to see which libs you should add for your needs.

Upvotes: 0

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