采用Android NDK和C ++ [英] Using Android NDK and C++

问题描述

我拿到样品HelloJni项目的工作，它采用了原生code A C文件。我一直没能得到与C ++工作的简单的例子。看看下面的JNI code：

I got the sample HelloJni project working, which uses a C file for the native code. I have not been able to get any simple examples working with C++. Take the following JNI code:

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

JNIEXPORT void JNICALL Java_com_test_testActivity_doSomething(JNIEnv * env, jobject obj)
{

}

如果我有一个.c文件的code，它工作正常。如果我改变扩展.CPP它编译罚款，但运行（强制关闭）时炸毁。由于图书馆和方法签名是相同的无论哪种方式，我不怀疑问题是在Java端。

If I have the code in a .c file, it works fine. If I change the extension to .cpp it compiles fine, but blows up when running (force closes). Since the library and method signature is the same either way, I don't suspect the problem being on the Java side.

推荐答案

您可能需要围绕你的code与的externC块：

You might need to surround your code with an extern "C" block:

extern "C" {

    JNIEXPORT ...

}

您应该能够使一个版本将在C和C ++的工作在包裹的extern块＃如果：

You should be able to make a version that will work in both C and C++ by wrapping the extern block in #if:

#ifdef __cplusplus
extern "C" {
#endif

JNIEXPORT ...

#ifdef __cplusplus
}
#endif

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