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目的： 添加自定义的系统服务，在自定义的服务中开发定制的API接口和功能，独立于系统核心服务，方便开发和维护。

开发环境：Android 13 MTK平台

涉及修改的文件如下

device/mediatek/sepolicy/base/private/service_contexts
device/mediatek/sepolicy/base/vendor/platform_app.te
device/mediatek/sepolicy/base/vendor/priv_app.te
device/mediatek/sepolicy/base/vendor/service_contexts
device/mediatek/sepolicy/base/vendor/system_app.te
device/mediatek/sepolicy/base/vendor/untrusted_app.te
device/mediatek/sepolicy/base/vendor/untrusted_app_27.te
frameworks/base/Android.bp
frameworks/base/core/api/current.txt
frameworks/base/core/java/android/app/SystemServiceRegistry.java
frameworks/base/core/java/android/content/Context.java
frameworks/base/services/java/com/android/server/SystemServer.java
system/sepolicy/prebuilts/api/33.0/private/service_contexts
system/sepolicy/private/service_contexts
system/sepolicy/private/untrusted_app_30.te
system/sepolicy/public/service.te
frameworks/base/core/java/android/app/CustomServiceManager.java
frameworks/base/core/java/android/os/custom/ICustomService.aidl
frameworks/base/services/core/java/com/android/server/CustomService.java

功能实现：

1.添加自定义服务AIDL文件：ICustomService.aidl，定义接口

路径：frameworks/base/core/java/android/os/custom/ICustomService.aidl

package android.os.custom;interface ICustomService {String getTestTime();
}

2.添加自定义服务管理类：CustomServiceManager.java，Context.CUSTOM_SERVICE 是新增服务的标识，见下面的 Context.java的修改。

路径：frameworks/base/core/java/android/app/CustomServiceManager.java

package android.app;import android.content.Context;
import android.os.custom.ICustomService;
import android.annotation.SystemService;
import android.util.Log;@SystemService(Context.CUSTOM_SERVICE)
public class CustomServiceManager {private static final String TAG = "CustomServiceManager";ICustomService mService;public CustomServiceManager(Context context,ICustomService service){mService=service;}public String getTestTime(){try{return mService.getTestTime();}catch(Exception e){Log.d(TAG,"getTestTime e.getMessage()="+e.getMessage());return "";}}
}

3.添加自定义服务实现类：CustomService.java，实现具体的功能。

路径：frameworks/base/services/core/java/com/android/server/CustomService.java

package com.android.server;import java.lang.*;
import java.util.Date;
import java.util.Locale;import android.icu.text.SimpleDateFormat;
import android.os.RemoteException;
import android.os.custom.ICustomService;
import android.content.Context;
import android.util.Log;public class CustomService extends ICustomService.Stub {private static final String TAG="CustomService";private final Context mContext;public CustomService