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아래와 같이 Android studio에서

1, AIDL 인터페이스 작성

2, Client 코드에서 Native Service를 ServiceManager로 가져와 Service의 함수들을 이용

모두 시도해본 것은 아니나 아래의 경우의 수가

모두 AIDL or Binder를 통하여 IPC가 가능

Native Service <-> Java Client

Native Service <-> Native Client

Java Service <-> Java Client

Java Service <-> Native Client

#AIDL

package android.binder.example;

/**
 * AIDL file for Binder API generating
 *
 */

interface IDemoAPI{
    String getName();
    String getFullName(String part);
    int sum(int a,int b);
}

#JAVA Client

package com.technicolor.clienttest;

import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.binder.example.IDemoAPI;

import java.lang.reflect.Method;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private IDemoAPI mService;
    private static final String TAG = "HelloActivity IDemoAPI";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getDemoAPIService();
        try{
            Log.d(TAG, "1+2="+Integer.toString(mService.sum(1,2)));
            Log.d(TAG, "Name="+mService.getName());
            Log.d(TAG, "FullName="+mService.getFullName("AAABBBCCC"));
        }catch(Exception e){
            Log.d(TAG,e.toString());
        }
    }

    static final String SERVICE_NAME="android.binder.example";

    /*
     * Get binder service
     */
    private void getDemoAPIService()
    {
        IBinder binder=null;
        Log.d(TAG,"getDemoAPIService");
        try{
            //android.os.ServiceManager is hide class, we can not invoke them from SDK. So we have to use reflect to invoke these classes.
            Object object = new Object();
            Method getService = Class.forName("android.os.ServiceManager").getMethod("getService", String.class);
            Object obj = getService.invoke(object, new Object[]{new String(SERVICE_NAME)});
            binder = (IBinder)obj;
        }catch(Exception e){
            Log.d(TAG, e.toString());
        }
        if(binder != null){
            mService = IDemoAPI.Stub.asInterface(binder);
            Log.d(TAG, "Find binder");
        }
        else
            Log.d(TAG,"Service is null.");
    }

}

#Native Service

#include "server.h"

int main(int argc, char *argv[])
{
    sp proc(ProcessState::self());
    //get service manager
    sp sm = defaultServiceManager();

    //Register a service with the SERVICE_NAME
    sm->addService(String16(SERVICE_NAME),new demo_api::DemoAPI());
    ALOGE("%s service is starting.....",SERVICE_NAME);
    //Start Service
    ProcessState::self()->startThreadPool();
    //Loop for waiting for request
    IPCThreadState::self()->joinThreadPool();

    return 0;
}

출처:

1, <https://stackoverflow.com/questions/42002869/is-it-possible-to-bind-to-a-java-service-from-a-native-c-client-and-transact>

2, https://github.com/qianjigui/android_system_service_example