如何使用android-ndk？

Question

I use PTAM code taken from here . I try to make an android application with this code.

The PTAM code uses libcvd, TooN, gvars3 library. I generate a .so file from my c++ test file using ndk-build .

Firstly, I try to run below code on android phone :

#include <string.h>
#include <jni.h>

extern "C" {

    int returnInt()
    {

        int returnVal = 4;
        return returnVal;
    }
}

It can generate .so file without any errors. If I add #include < TooN/TooN.h > , `ndk-build says that

fatal error: TooN/TooN.h: No such file or directory
 #include <TooN/TooN.h>
                       ^
compilation terminated.

Android.mk is :

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := test-jni
LOCAL_SRC_FILES := test-jni.cpp

include $(BUILD_SHARED_LIBRARY)

How can I solve this error message?

Answer 1

fatal error: TooN/TooN.h: No such file or directory #include <TooN/TooN.h>

When you use <> with #include , the compiler will search for the file in your include path (and possibly other predefined directories).

To add a directory to your include path when building a module in Android.mk you would add it to LOCAL__INCLUDES . For example, if the full path to TooN.h is /home/foobar/TooN/TooN.h you should do this:

LOCAL_C_INCLUDES += /home/foobar

---

I get fatal error: iostream: No such file or directory.There is no folder named iostream under usr/include or usr/local/include.

The iostream class is part of the STL, so you need to specify an STL implementation to build against. This can be done using the APP_STL variable in Application.mk . For example:

APP_STL := gnustl_shared

See this page for a list of STL implementations available with the NDK.