一个Native Service的完整示例

参考：http://blog.csdn.net/ljsbuct/article/details/7108578
          http://blog.csdn.net/blackboyofsnp/article/details/7243070
在android源代码下新建一个nativeservice的目录，在下面分别创建'add','application','jni','service'几个目录。
1.service下有AddService.h、AddService.cpp、addserver.cpp、Android.mk几个文件
  AddService.h：
   点击(此处)折叠或打开

#ifndef ANDROID_ADDSERVICE_H
#define ANDROID_ADDSERVICE_H

#include <utils/RefBase.h>
#include <binder/IInterface.h>
#include <binder/Parcel.h>

namespace android
{
    class AddService : public BBinder
    {
    private:
        mutable Mutex m_Lock;
        int32_t m_NextConnId;

    public:
        static int Instance();
        AddService();
        virtual ~AddService();
        virtual status_t onTransact(uint32_t, const Parcel&, Parcel*, uint32_t);
    };
}

#endif

AddService.cpp

#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include "AddService.h"

namespace android
{
    static struct sigaction oldact;
    static pthread_key_t sigbuskey;

    int AddService::Instance()
    {
        LOGE("ZPService Instantiate\n");
        int ret = defaultServiceManager()->addService(
                String16("zp.svc"), new AddService());
        LOGE("AddService ret = %d\n", ret);
        return ret;
    }

    AddService::AddService()
    {
        LOGV("AddService create\n");
        //m_NextConnId = 1;
        pthread_key_create(&sigbuskey,NULL);
    }

    AddService::~AddService()
    {
        pthread_key_delete(sigbuskey);
        LOGV("AddService destory\n");
    }

    status_t AddService::onTransact(uint32_t code,
                                 const Parcel& data,
                                   Parcel* reply,
                                   uint32_t flags)
    {
        switch(code)
        {
        case 0:
            {
                pid_t pid = data.readInt32();
                int num = data.readInt32();
                num += 1000;
                reply->writeInt32(num);
                return NO_ERROR;
            } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
        }
    }
}

addserver.cpp

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <grp.h>
#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>
#include <utils/Log.h>
#include "AddService.h"

using namespace android;


int main(int arg, char** argv)
{
    printf("server - ain() begin\n");
    sp<ProcessState> proc(ProcessState::self());
    sp<IServiceManager> sm = defaultServiceManager();
    //LOGI("ServiceManager: %p\n", sm.get());
    printf("server - erviceManager: %p\n", sm.get());
    int ret = AddService::Instance();
    printf("server - ZPService::Instance return %d\n", ret);
    ProcessState::self()->startThreadPool();

        IPCThreadState::self()->joinThreadPool();
        return 0;
}

Android.mk

LOCAL_PATH:=$(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:=AddService.cpp addserver.cpp
LOCAL_SHARED_LIBRARIES:=libutils libbinder
LOCAL_MODULE_TAGS:=optional
LOCAL_MODULE:=addservice
LOCAL_PRELINK_MODULE:=false
#include $(BUILD_SHARED_LIBRARY)
include $(BUILD_EXECUTABLE)

  在service目录下执行mm，可以生成可执行文件addservice。

2.Add目录下有‘Add.cpp’，‘Add.h’,'Android.mk'几个文件
 Add.h

#ifndef _Included_Add
#define _Included_Add

namespace android
{
    class Add
    {
    public:
        int setN(int n);
    private:
        static void getAddService();
    };
}
#endif

Add.cpp

#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include <Add.h>
#include <stdio.h>
#include <stdlib.h>
#include <jni.h>
namespace android
{
    sp<IBinder> binder;

    int Add::setN(int n)
    {
        getAddService();
        Parcel data, reply;
        data.writeInt32(getpid());
        data.writeInt32(n);

        LOGE("client - binder->transact()\n");
        binder->transact(0, data, &reply);
        int r = reply.readInt32();
        return r;
    }

    void Add::getAddService()
    {
        sp<IServiceManager> sm = defaultServiceManager();
        binder = sm->getService(String16("zp.svc"));
        LOGE("client - etService: %p\n", sm.get());
        if(binder == 0)
        {
            LOGW("ZPService not published, waiting...");
            return;
        }
    }

};

Android.mk

LOCAL_PATH:=$(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:=Add.cpp
LOCAL_SHARED_LIBRARIES:=libutils libbinder
LOCAL_MODULE_TAGS:=optional
LOCAL_MODULE:=libAdd
LOCAL_PRELINK_MODULE:=false
include $(BUILD_SHARED_LIBRARY)

  在service目录下执行mm，可以生成库文件libAdd.so
3.jni目录下有‘com_hello_Service_MySer.h’，‘com_hello_Service_MySer.cpp’,'Android.mk'几个文件
com_hello_Service_MySer.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_hello_Service_MySer */
#ifndef _Included_com_hello_Service_MySer
#define _Included_com_hello_Service_MySer
#ifdef __cplusplus
extern "C" {
#endif
/*
  * Class: com_hello_Service_MySer
  * Method: intFromJNI
  * Signature: ()I
  */
JNIEXPORT jint JNICALL Java_com_hello_Service_MySer_intFromJNI
  (JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif

com_hello_Service_MySer.cpp

#include <jni.h>
#include <JNIHelp.h>
#include "../add/Add.h"
#include "com_hello_Service_MySer.h"

using namespace android;
JNIEXPORT jint JNICALL Java_com_hello_Service_MySer_intFromJNI(JNIEnv * env, jobject)
{
    Add* p = new Add();
    int r = p->setN(5);
    return r;
}

Android.mk

LOCAL_PATH:=$(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:=com_hello_Service_MySer.cpp
LOCAL_SHARED_LIBRARIES:=libutils libAdd
LOCAL_MODULE_TAGS:=optional
LOCAL_C_INCLUDES:= $(JNI_H_INCLUDE)
LOCAL_MODULE:=libJniAdd
LOCAL_PRELINK_MODULE:=false
include $(BUILD_SHARED_LIBRARY)

  在service目录下执行mm，可以生成库文件libJniAdd.so
4.application目录下是一个app工程
MySer.java：

package com.hello.Service;


import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MySer extends Activity {

    private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_ser);
        int i = intFromJNI();
        tv = (TextView)findViewById(R.id.tv);
        tv.setText( String.valueOf(i) );
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.my, menu);
        return true;
    }
     public native int intFromJNI();
     static {
     System.loadLibrary("JniAdd");
     }

}

可以生成Service.apk。
5.Service.apk 安装到手机
   addservice push到/system/bin
   libAdd.so和libJniAdd.so push到/system/lib
6.修改init.rc，在下面新增：
  

service addservice /system/bin/addservice
class main
user root

这样就新增了一个服务，通过ps ,service list 或getprop都可以查看该服务
6.运行app