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[原创]Android AOSP 添加系统服务【aidl接口服务】Java层

4小时前 194

[原创]Android AOSP 添加系统服务【aidl接口服务】Java层

基于系统源码 8.1 版本修改添加的

1.添加接口

android8.1/frameworks/base/core/java/android/app/IDemoManager.aidl
package android.app;
interface IDemoManager
{
    int getCpuTemperature();
}

2.添加系统服务，实现aidl文件的接口

android8.1/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;
        }   
}

3.添加系统服务的Manager

android8.1/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;
        }   
}

4.添加aidl到Makefile src

android8.1/frameworks/base/Android.mk
LOCAL_SRC_FILES += \ 
        core/java/android/app/IDemoManager.aidl \

5.添加DEMO_SERVICE常量

android8.1/frameworks/base/core/java/android/content/Context.java
public static final String DEMO_SERVICE = "demo";

6.将实现的服务注册到系统中去

android8.1/frameworks/base/core/java/android/app/SystemServiceRegistry.java

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

7.将注册的服务设置成开机启动服务

android8.1/frameworks/base/services/java/com/android/server/SystemService.java

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

8.编译源码 更新api接口

make  update-api

9.修改selinux 添加新服务的权限

/android8.1/device/huawei/angler/sepolicy/service.te
type demo_service, system_api_service, system_server_service, service_manager_type;

android8.1/device/huawei/angler/sepolicy/service_contexts
demo u:object_r:demo_service:s0

10.使用service list 查看服务

angler:/ # service list 
Found 136 services:
0    sip: [android.net.sip.ISipService]
1    ims: [com.android.ims.internal.IImsService]
2    carrier_config: [com.android.internal.telephony.ICarrierConfigLoader]
3    phone: [com.android.internal.telephony.ITelephony]
4    isms: [com.android.internal.telephony.ISms]
5    iphonesubinfo: [com.android.internal.telephony.IPhoneSubInfo]
6    simphonebook: [com.android.internal.telephony.IIccPhoneBook]
7    isub: [com.android.internal.telephony.ISub]
8    nfc: [android.nfc.INfcAdapter]
9    telecom: [com.android.internal.telecom.ITelecomService]
10    contexthub: [android.hardware.location.IContextHubService]
11    netd_listener: [android.net.metrics.INetdEventListener]
12    connmetrics: [android.net.IIpConnectivityMetrics]
13    bluetooth_manager: [android.bluetooth.IBluetoothManager]
14    autofill: [android.view.autofill.IAutoFillManager]
15    imms: [com.android.internal.telephony.IMms]
16    media.camera.proxy: [android.hardware.ICameraServiceProxy]
17    media_projection: [android.media.projection.IMediaProjectionManager]
18    launcherapps: [android.content.pm.ILauncherApps]
...

如果服务不存在则可能是 selinux 策略添加失败导致没有权限无法启动，所以需要继续去修改添加selinux策略，本次测试使用的手机是Nexus 5系统版本为8.1 所以修改的策略路径为 device/huawei/angler/sepolicy/service.te service_contexts 。如果是在其他设备上添加系统服务那么这个路径可能会不适用，使用 find -name service.te 查找当前系统文件树下路径。找到与当前设备名相一致的路径进去修改添加策略。

编译后使用 service list 命令 可看到添加的服务。
angler:/ # service list |grep demo    
51    demo: [android.app.IDemoManager]

11.编写代码测试

import android.app.DemoManager; 

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

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