package com.wwj.jni;public class TestJNI {    public native boolean Init();    public native int Add(int x, int y);    public native void Destory();
}

/* DO NOT EDIT THIS FILE - it is machine generated */#include <jni.h>
/* Header for class com_wwj_jni_TestJNI */#ifndef _Included_com_wwj_jni_TestJNI#define _Included_com_wwj_jni_TestJNI#ifdef __cplusplusextern "C" {
#endif
/** Class:     com_wwj_jni_TestJNI* Method:    Init* Signature: ()Z*/JNIEXPORT jboolean JNICALL Java_com_wwj_jni_TestJNI_Init(JNIEnv *, jobject);
/** Class:     com_wwj_jni_TestJNI* Method:    Add* Signature: (II)I*/
JNIEXPORT jint JNICALL Java_com_wwj_jni_TestJNI_Add(JNIEnv *, jobject, jint, jint);
/** Class:     com_wwj_jni_TestJNI* Method:    Destory* Signature: ()V */JNIEXPORT void JNICALL Java_com_wwj_jni_TestJNI_Destory(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif

#ifndef _TEST_JNI_ADD_H_#define _TEST_JNI_ADD_H_class CAdd {public:CAdd();    ~CAdd();    int Add(int x, int y);};
#endif

#include "Add.h"CAdd::CAdd() {}CAdd::~CAdd() {}int CAdd::Add(int x, int y) {    return x + y;
}

#include <stdio.h>
#include <stdlib.h>
#include "com_wwj_jni_TestJNI.h"
#include "Add.h"
Add *pCAdd = NULL;
JNIEXPORT jboolean JNICALL Java_com_wwj_jni_TestJNI_Init(JNIEnv *env,jobject obj) {   if (pCAdd == NULL) {pCAdd = new CAdd;}    return pCAdd != NULL;
}
JNIEXPORT jint JNICALL Java_com_wwj_jni_TestJNI_Add(JNIEnv *env, jobject obj,jint x, jint y) {    int res = -1;    if (pCAdd != NULL) {res = pCAdd->Add(x, y);}    return res;
}
JNIEXPORT void JNICALL Java_com_wwj_jni_TestJNI_Destory(JNIEnv *env, jobject obj)
{    if (pCAdd != NULL){pCAdd = NULL;}
}

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := TestJNI
LOCAL_SRC_FILES := com_wwj_jni_TestJNI.cpp
LOCAL_SRC_FILES += Add.cpp
include $(BUILD_SHARED_LIBRARY)

APP_PROJECT_PATH := $(call my-dir)
APP_MODULES := TestJNI

package com.wwj.jni;
import android.os.Bundle;
import android.widget.TextView;
import android.app.Activity;
public class TestJNIActivity extends Activity {
private TextView textView;
static {        // 加载动态库System.loadLibrary("TestJNI");}@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView = (TextView) findViewById(R.id.textview);TestJNI testJNI = new TestJNI();        // 调用native方法boolean init = testJNI.Init();        if (init == true) {            // 调用Add函数int sum = testJNI.Add(100, 150);textView.setText("你真是个" + sum);} else {textView.setText("你比二百五还要二百五");}testJNI.Destory();}
}

Android NDK: Could not find application project directory !
Android NDK: Please define the NDK_PROJECT_PATH variable to point to it.
D:\java\android-ndk-r9d\build/core/build-local.mk:148: *** Android NDK: Aborting.  Stop.

APP_PROJECT_PATH := $(call my-dir)/ 成 APP_PROJECT_PATH := $(call my-dir)/..