All the ndk samples only make use of basic C functions declared as extern in the header and defined in the cpp file. Then after including the header file in the C file containing the jni callback, everything works fine.

Is it possible to use C++ classes with the android ndk? My application is not going to be a native activity, it will still have an important java part but it will call native C code for CPU-intensive computation (already written in C++, with classes and other C++ stuff).

Here is my hello-world like strcuture for now:

File "first.h"

```
#ifndef FIRST_H
#define FIRST_H

class Test
{};

#endif /* FIRST_H */

```

File "second.cpp"

```
#include <jni.h>
#include "first.h"

#ifdef __cplusplus
extern "C" {
#endif

jint Java_com_example_twolibs_TwoLibs_add( JNIEnv*  env,
                                      jobject  this,
                                      jint     x,
                                      jint     y )
{
    Test t;
    return 0;
}

#ifdef __cplusplus
}
#endif

```

And finally Android.mk

```
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := libtwolib-second
LOCAL_SRC_FILES := second.cpp

include $(BUILD_SHARED_LIBRARY)

```

Pretty basic but that does not compile. Turning second.cpp in a .c file raises an error when including the header file, I guess this is because it is not a C++ file.

```
error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Test'

```

Making it .cpp raises the following error:

```
make: *** No rule to make target `/cygdrive/c/android-ndk-r5c/samples/twolibs/jni/second.c', needed by `/cygdrive/c/android-ndk-r5c/samples/two-libs/obj/local/armeabi/objs/twolib-second/second.o'.  Stop.

```

Any idea how I can make that thing compile?

Thanks