android 系统service,Android添加一个系统service

指定一个接口

该例使用了AIDL，因此第一步添加一个接口定义文件。

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

package android.os;

interface IEneaService {

/**

* {@hide}

*/

void setValue(int val);

}

这个文件将被添加到系统build文件中:

frameworks/base/Android.mk

添加下面的内容在 165行 ( SRC_FILES列的末尾 ):

core/java/android/os/IEneaService.aidl

实现服务器端

服务产生一个工作线程作为系统服务器进程的一部分，将做的一切工作。由于服务是由系统服务创建的，它会需要到系统服务可以找到它的位置。

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;

msg.arg1 = val;

mHandler.sendMessage(msg);

}

private class EneaWorkerThread extends Thread{

public EneaWorkerThread(String name) {

super(name);

}

public void run() {

Looper.prepare();

mHandler = new EneaWorkerHandler();

Looper.loop();

}

}

private class EneaWorkerHandler extends Handler {

private static final int MESSAGE_SET = 0;

@Override

public void handleMessage(Message msg) {

try {

if (msg.what == MESSAGE_SET) {

Log.i(TAG, “set message received: ” + msg.arg1);

}

} catch (Exception e) {

// Log, don’t crash!

Log.e(TAG, “Exception in EneaWorkerHandler.handleMessage:”, e);

}

}

}

}

添加系统服务

services/java/com/android/server/SystemServer.java

try {

Log.i(TAG, “Enea Service”);

ServiceManager.addService(Context. ENEA_SERVICE, new EneaService(context));

} catch (Throwable e) {

Log.e(TAG, “Failure starting Enea Service”,     e);

}

添加常量值到 Context

./core/java/android/content/Context.java

public static final String ENEA_SERVICE = “enea”;

最后

make update-api

make