как привязать активность hostapduservice

Я хочу установить связь между активностью и HostApduService. Мне не удалось установить двустороннюю связь между ними обоими, OnBind из HostApduService объявлено final, мы просто ограничены использованием уведомлений для связи между ними. На сегодняшний день мне удалось установить связь между HostApduService и Activity.

Мой класс активности

public class MainActivity extends Activity {

 private static final String TAG = MainActivity.class.getSimpleName();

 private BroadcastReceiver receiver = new BroadcastReceiver() {

     @Override
     public void onReceive(Context context, Intent intent) {
         Bundle bundle = intent.getExtras();
         if (bundle != null) {
             boolean transactionFinished = bundle.getBoolean(HosService.COMMUNICATION_FINISHED);
             String hceServiceMessage = bundle.getString(HostService.APDU_LOG);

             Toast.makeText(MainActivity.this,
                     transactionFinished ? "HCE Transaction accomplished!" : "HCE Transaction in progress!",
                     Toast.LENGTH_LONG).show();

             TextView t = (TextView) MainActivity.this.findViewById(R.id.textView2);
             t.setText(hceServiceMessage);
             t.refreshDrawableState();
       }
     }

    };

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

     }

     @Override
     protected void onResume() {
         super.onResume();
         registerReceiver(receiver, new IntentFilter(HostService.NOTIFICATION));
     }
     @Override
     protected void onPause() {
         super.onPause();
         unregisterReceiver(receiver);
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
 //        getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         // Handle action bar item clicks here. The action bar will
         // automatically handle clicks on the Home/Up button, so long
         // as you specify a parent activity in AndroidManifest.xml.
         int id = item.getItemId();

         return super.onOptionsItemSelected(item);
     }

И мой класс обслуживания:

public class HostService extends HostApduService {

private static final String TAG = HostService.class.getSimpleName();
private static boolean secureSessionInProgress = false;
private static List<String> secureSessionApdu = new ArrayList<String>();
private static String transactionLog = "";
public static final String NOTIFICATION = "net.hce";
public static final String COMMUNICATION_FINISHED = "finished";
public static final String APDU_LOG = "apdu";

public HostService() {
}

@Override
public byte[] processCommandApdu(byte[] cmd_bytes, Bundle bundle) {
    byte[] resp_bytes = null;

   // ***********************************
   // Here I want to exchange data with activity
   // Intent intent = new Intent(NOTIFICATION);
   // intent.putExtra (APDU_LOG, finishedTransactionLog);
   // intent.putExtra(COMMUNICATION_FINISHED, communicationFinished);
   // sendBroadcast(intent);
   // ...
   // How to get info from activity??
   // ************************************ 
   transactionLog += "> ";return resp_bytes;
}

@Override
public void onDeactivated(int reason) {
    secureSessionInProgress = false;
    Log.d(TAG, "deactivated. reason=" + reason);

    transactionLog = "";
}

}