/proc文件系统

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 __cplusplus
extern "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"

CAdd *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();
	}
}