Android添加一个系统service

核心提示：Specifying the interface.This example uses aidl, so the first step is to add an interface definition file:frameworks/base/core/java/android/os/IEneaService.aidl

Specifying the interface.

This example uses aidl, so the first step is to add an interface definition file:

frameworks/base/core/java/android/os/IEneaService.aidl

package android.os;

interface IEneaService {

/**

* {@hide}

*/

void setValue(int val);

}

The interface file will need to be added to the build system:

frameworks/base/Android.mk

Add the following around line 165 (the end of the list of SRC_FILES):

core/java/android/os/IEneaService.aidl

Implementing the server

The service spawns a worker thread that will do all the work, as part of the system server process. Since the service is created by the system server, it will need to be located somewhere where the system server can find it.

frameworks/base/services/java/com/android/server/EneaService.java

package com.android.server;

import android.content.Context;

import android.os.Handler;

import android.os.IEneaService;

import android.os.Looper;

import android.os.Message;

import android.os.Process;

import android.util.Log;

public class EneaService extends IEneaService.Stub {

private static final String TAG = "EneaService";

private EneaWorkerThread mWorker;

private EneaWorkerHandler mHandler;

private Context mContext;

public EneaService(Context context) {

super();

mContext = context;

mWorker = new EneaWorkerThread("EneaServiceWorker");

mWorker.start();

Log.i(TAG, "Spawned worker thread");

}

public void setValue(int val)

{

Log.i(TAG, "setValue " + val);

Message msg = Message.obtain();

msg.what = EneaWorkerHandler.MESSAGE_SET;