protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		//Definizione UI element
		btreadchip = (Button) findViewById(R.id.btreadchip);
		btreset = (Button) findViewById(R.id.btreset);
		txsend = (EditText) findViewById(R.id.txsend);
		txresponse = (TextView) findViewById(R.id.txresponse);
		pbScan = (ProgressBar) findViewById(R.id.pbScan);
		
		//Set on click listner
        View.OnClickListener btManager = new View.OnClickListener() 
        {
		  	public void onClick(View view) 
		  	{     
		  	    switch(view.getId())
		  	    {
		  	      case R.id.btreadchip:
		  	    	  String apdu =  txsend.getText().toString();
		  	    	  if(apdu.length() > (int) 8){
		  	    		  command = new byte[apdu.length()/2];
		  	    		  hexStrTOarray(apdu, command);
		  	    		  pbScan.setVisibility(view.VISIBLE);
		  	    		  lifecycle = 1;		//means app is ready to read from the card  
		  	    	  }
		  	    	  break;
		  	      case R.id.btreset:
		  	    	  lifecycle = 0;
		  	    	  txsend.setText("");
		  	    	  txresponse.setText("");	
		  	    	  pbScan.setVisibility(pbScan.INVISIBLE);
		  	    	  break;
		  	    }
		  	}
        };
        
        btreset.setOnClickListener(btManager);
        btreadchip.setOnClickListener(btManager);
        
        mAdapter = NfcAdapter.getDefaultAdapter(this);
		// Create a generic PendingIntent that will be deliver to this activity.
		// The NFC stack
		// will fill in the intent with the details of the discovered tag before
		// delivering to
		// this activity.
		mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
				getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
		// Setup an intent filter for all MIME based dispatches
		IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);

		try {
			ndef.addDataType("*/*");
		} catch (MalformedMimeTypeException e) {
			throw new RuntimeException("fail", e);
		}
		mFilters = new IntentFilter[] { ndef, };

		mTechLists = new String[][] { new String[] { NfcB.class.getName() },
									  new String[] { NfcA.class.getName() }};
		Intent intent = getIntent();
		String response = resolveIntent(intent);
		txresponse.setText(response);
	}
	
	//Rilevo la carta dal NFC
	String resolveIntent(Intent intent) {
		
		//byte[] command;
    	byte[] feedback;
    	String dati = "";
    	int res, MaxIndex, lastCmd;
    	final int bqty = 192; //numero massiomo di byte letti per singola apdu (lettura DG2)

		
		//Verifico che siamo pronti per leggere la carta
    	if(lifecycle != 1) return("");
    	
    	String action = intent.getAction();
		if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)) {
			// status_Data.setText("Discovered tag with intent: " + intent);
			//Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
			//MifareClassic mfc = MifareClassic.get(tagFromIntent);
			Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    		String[] tectList = tagFromIntent.getTechList();
    		byte[] tagid = tagFromIntent.getId();
    		
    		int lenght = tagid.length;
    		byte[] lenghtArray = {(byte) lenght};
    		
    		String Stagid = MainActivity.getHex(tagid);
    		//NfcB nfcB = NfcB.get(tagFromIntent);
    		IsoDep iso = IsoDep.get(tagFromIntent);
    		try {
				iso.connect();
				//#####  Invio apdu: Select EF 00 (DG1)
	    		dati = "";
				//command = new byte[]{(byte) 0x00, (byte) 0xA4, (byte) 0x00, (byte) 0x00, (byte) 0x02, (byte) 0x3F, (byte) 0x00};
				feedback = iso.transceive(command);
				dati = getHex(feedback).replace(" ", "");;
//				if(dati.length() < 4 || !dati.substring(dati.length() - 4, dati.length()).equals("9000")){
//					showAlert("Status Word Error - Personal Data Selection");
//					return("");
//				}
				
    		} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		lifecycle = 0;
		return(dati);
	}

	@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 void onResume() {
		super.onResume();
		mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters,
				mTechLists);
		resolveIntent(getIntent());
	}

	@Override
	public void onNewIntent(Intent intent) {
		if (lifecycle == 1){
			String response = resolveIntent(intent); //activate for card reading
			txresponse.setText(response);
			pbScan.setVisibility(pbScan.INVISIBLE);
			//resolveIntent(intent);  //activate for card reading
		}
		// mText.setText("Discovered tag " + ++mCount + " with intent: " +
		// intent);
	}

	@Override
	public void onPause() {
		super.onPause();
		mAdapter.disableForegroundDispatch(this);
	}

}