Process SELECT command in Android NFC CardService processCommand

[UNKNwYSHSA]

I write code on android platform, emulate a card using jCardSim, use the NFC interface for communication. Code as follows:

Code: Select all

package com.example.jcardsim_nfc;

import javacard.framework.AID;
import javacard.framework.ISO7816;

import com.licel.jcardsim.base.Simulator;
import com.licel.jcardsim.samples.HelloWorldApplet;

import android.content.Intent;
import android.nfc.cardemulation.HostApduService;
import android.os.Bundle;

public class CardService extends HostApduService {
   private Simulator _theSimulator;
   private AID _theAppletAID;
   
   @Override
   public byte[] processCommandApdu(byte[] commandApdu, Bundle extras) {
      // TODO Auto-generated method stub
      Intent broadcastIntent = new Intent("APDU_LOG_CHANGING");
      broadcastIntent.putExtra("commandApdu", commandApdu);
      sendBroadcast(broadcastIntent);
      
      if (_theSimulator != null) {
         if ((commandApdu[ISO7816.OFFSET_INS] == (byte) 0xA4) && (commandApdu[ISO7816.OFFSET_P1] == 0x04) && (commandApdu[ISO7816.OFFSET_P2] == 0x00)) {
            if (_theSimulator.selectApplet(_theAppletAID)) {
               return new byte[] { (byte) 0x90, 0x00 };
            } else {
               return new byte[] { 0x6F, 0x00 };
            }
            
         } else {
            byte[] rspApdu = _theSimulator.transmitCommand(commandApdu);
            
            Intent broadcastIntent2 = new Intent("APDU_LOG_CHANGING");
            broadcastIntent2.putExtra("rspApdu", rspApdu);
            sendBroadcast(broadcastIntent2);
            
            return rspApdu;
         }
      }
      
      return null;
   }

   @Override
   public void onDeactivated(int reason) {
      // TODO Auto-generated method stub

      Intent broadcastIntent = new Intent("DEBUG_INFO");
      broadcastIntent.putExtra("debugInfo", "CardService deactivated;");
      sendBroadcast(broadcastIntent);
   }
   
   @Override
   public void onCreate() {
      // TODO Auto-generated method stub
      super.onCreate();
      
      _theSimulator = new Simulator();
      byte[] aidBytes = new byte[] {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09};
      _theAppletAID = new AID(aidBytes, (short)0, (byte)aidBytes.length);
      _theSimulator.installApplet(_theAppletAID, HelloWorldApplet.class);
      
      Intent broadcastIntent = new Intent("DEBUG_INFO");
      broadcastIntent.putExtra("debugInfo", "CardService created;");
      sendBroadcast(broadcastIntent);
   }

}

I can transmit apdu normally. But i always feel bad processing of SELECT instruction. How do you think?

[predators]

The method you are using is the only method that I know.