Communicate with cardlet

talkToCard.java

    protected void readCard(final IsoDep card) {
        byte[] response = null;
        try {
            card.connect();
            response = card.transceive(Utils.selectApdu(APPLICATION_ID));
            card.close();
        } catch (IOException e) {
            Log.e(TAG, "Error reading card", e);
        }
        if (response != null && Arrays.equals(Utils.statusBytes(response), successfulApdu)) {
            byte[] payload = Utils.responseData(response);
            String printableResponse = new String();
            for (int i=0; i<payload.length; i++) printableResponse += (char)payload[i];
            mainMessage.setText(printableResponse);
        } else {
            // enable the button so the user can install the cardlet
            mainMessage.setText(R.string.cardlet_not_installed);
            installButton.setVisibility(View.VISIBLE);
        }
    }