[Android][Framework] 添加系统服务

新博客地址
http://wossoneri.github.io/2018/09/15/[Android][Framework]create-system-service/

做系统开发，有时候需要自己定义一些接口供App使用，同时为了方便维护管理，就会需要自己建立一个服务，把新的功能集中在一起。下面就是新建一个系统服务的基本步骤。

添加接口

frameworks/base/core/java/android/app/IDemoManager.aidl

package android.app;interface IDemoManager{    int getCpuTemperature();}

添加服务，实现aidl文件定义的接口

frameworks/base/services/core/java/com/android/server/DemoManagerService.java

package com.android.server;import android.app.IDemoManager;import android.content.Context;import android.util.Slog;public class DemoManagerService extends IDemoManager.Stub {    private Context mContext;    public DemoManagerService(Context context) {        mContext = context;        Slog.d("Demo", "Construct");    }    @Override    public int getCpuTemperature() {        return 100; // Test code    }}

添加对应的Manager

frameworks/base/core/java/android/app/DemoManager.java

package android.app;import android.content.Context;import android.os.RemoteException;import android.util.Slog;public class DemoManager {    Context mContext;    IDemoManager mService;    public DemoManager(Context context, IDemoManager service) {        mContext = context;        mService = service;    }    public int getCpuTemperature() {        if (mService != null) {            try {                return mService.getCpuTemperature();            } catch (RemoteException e) {                Slog.e("Demo", "RemoteException " + e);            }        }        return -1;    }}

添加aidl到Makefile src

frameworks/base/Android.mk

LOCAL_SRC_FILES += \    core/java/android/app/IDemoManager.aidl \

添加DEMO_SERVICE常量

frameworks/base/core/java/android/content/Context.java
```
public static final String DEMO_SERVICE = "demo";
```

注册系统服务

frameworks/base/core/java/android/app/SystemServiceRegistry.java

registerService(Context.ORISLINK_SERVICE, DemoManager.class,    new CachedServiceFetcher() {        @Override        public DemoManager createService(ContextImpl ctx) {            IBinder b = ServiceManager.getService(Context.DEMO_SERVICE);            return new DemoManager(ctx, IDemoManager.Stub.asInterface(b));}});

开机启动服务

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

try {    ServiceManager.addService(Context.DEMO_SERVICE, new DemoManagerService(context));} catch (Throwable e) {    Slog.e("Demo", "Failed to start Demo Service " + e);}

编译源码，因为添加了接口，所以需要
```
make update-api
```
更新接口。然后再整编刷机。
service list 查看服务，不存在，这是因为selinux权限没加。
添加sepolicy权限

device/qcom/sepolicy/msm8937/service.te

type demo_service, system_api_service, system_server_service, service_manager_type;

device/qcom/sepolicy/msm8937/service_contexts

demo  u:object_r:demo_service:s0

重新编译代码，使用下面测试代码验证

import android.app.DemoManager;DemoManager om = (DemoManager) getSystemService(Context.DEMO_SERVICE);Log.d(TAG, "Current temperature is " + om.getCpuTemperature());

最终log打印出100，服务添加完成。

转载于:https://www.cnblogs.com/rossoneri/p/9651782.html

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