package echo.engineer.servicedemo;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.os.Messenger;
import android.support.annotation.Nullable;
import android.util.Log;

/**
 * MessageService
 * Created by Plucky<plucky.pan@ubnt.com> on 7/5/17 2017 13:45.
 */

public class MessageService extends Service {

    private static final String TAG = "MessageService";

    public MessageService() {
        Log.d(TAG, "MessageService()");
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate()");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy()");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG, "onStartCommand()");
        return super.onStartCommand(intent, flags, startId);
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "onBind()");
        return messenger.getBinder();
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.d(TAG, "onUnbind()");
        return super.onUnbind(intent);
    }

    public class MessageBinder extends Binder {
        public MessageService getService() {
            return MessageService.this;
        }
    }

    private Messenger messenger = new Messenger(new MessageHandler());
}

package echo.engineer.servicedemo;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.os.Messenger;
import android.support.annotation.Nullable;
import android.util.Log;

/**
 * MessageService
 * Created by Plucky<plucky.pan@ubnt.com> on 7/5/17 2017 13:45.
 */

public class MessageService extends Service {

    private static final String TAG = "MessageService";

    public MessageService() {
        Log.d(TAG, "MessageService()");
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate()");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy()");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG, "onStartCommand()");
        return super.onStartCommand(intent, flags, startId);
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "onBind()");
        return messenger.getBinder();
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.d(TAG, "onUnbind()");
        return super.onUnbind(intent);
    }

    private Messenger messenger = new Messenger(new MessageHandler());
}

remove useless file