i wrote a sample code to sending APDU to contactless smartcard by phone nfc reader and it worked succesfully. Now i want to write a android library to perform some operations like verify PIN and etc. these functions must connect to contactless smartcard and send apdu to it and return the result. The problem is here :(
This is my sample code which works:
public class MainActivity extends Activity {
private NfcAdapter mAdapter = null;
static IsoDep myTag;
private TextView lblStatus;
private Button btnSelectApplet;
private PendingIntent mPendingIntent;
boolean mFirstDetected=false;
boolean mShowAtr=false;
private String[][] mTechLists;
private IntentFilter[] mFilters;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lblStatus = (TextView) findViewById(R.id.lblStatus);
btnSelectApplet = (Button) findViewById(R.id.btnSelect);
btnSelectApplet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
byte[] select = new byte[] {0x00, (byte)0xa4, 0x04, 0x00, 0x09, (byte)0xa0, 0x00,
0x00, 0x03, 0x08, 0x00, 0x00, 0x10, 0x00, 0x1a};
byte[] res = transceives(select);
}
});
resolveIntent(getIntent());
mAdapter = NfcAdapter.getDefaultAdapter(this);
mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
try
{
ndef.addDataType("*/*");
}
catch (IntentFilter.MalformedMimeTypeException e)
{
throw new RuntimeException("fail", e);
}
mFilters = new IntentFilter[] { ndef, };
mTechLists = new String[][] { new String[] { IsoDep.class.getName() } };
}
private static byte[] transceives (byte[] data)
{
byte[] ra = null;
try
{
ra = myTag.transceive(data);
}
catch (IOException e)
{
}
try
{
}
catch (Exception e1)
{
e1.printStackTrace();
}
return (ra);
}
private void resolveIntent(Intent intent)
{
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action) || NfcAdapter.ACTION_TECH_DISCOVERED.equals(action) || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
Parcelable tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
final Tag t = (Tag) tag;
myTag = IsoDep.get(t);
mFirstDetected = true;
if (myTag != null) {
if (!myTag.isConnected()) {
try {
myTag.connect();
myTag.setTimeout(5000);
} catch (IOException e) {
e.printStackTrace();
return;
}
}
if (myTag.isConnected()) {
String szATR = null;
try {
mShowAtr = true;
szATR = " 3B " + getATRLeString(myTag.getHistoricalBytes()) + "80 01 " + getHexString(myTag.getHistoricalBytes()) + "" + getATRXorString(myTag.getHistoricalBytes());
} catch (Exception e) {
mShowAtr = false;
szATR = "CARD DETECTED ";
}
lblStatus.setText(szATR);
} else {
lblStatus.setText("Not Connected!");
}
if (mFirstDetected == true && myTag.isConnected()) {
} else {
lblStatus.setText("Not Connected!");
}
}
}
}
private static String getATRLeString(byte[] data) throws Exception
{
return String.format("%02X ", data.length | 0x80);
}
private static String getATRXorString(byte[] b) throws Exception
{
int Lrc=0x00;
Lrc = b.length | 0x80;
Lrc = Lrc^0x81;
for (int i=0; i < b.length; i++)
{
Lrc = Lrc^(b[i] & 0xFF);
}
return String.format("%02X ", Lrc);
}
private static String getHexString(byte[] data) throws Exception
{
String szDataStr = "";
for (int ii=0; ii < data.length; ii++)
{
szDataStr += String.format("%02X ", data[ii] & 0xFF);
}
return szDataStr;
}
@Override
protected void onNewIntent(Intent intent)
{
setIntent(intent);
resolveIntent(intent);
}
@Override
public void onResume()
{
super.onResume();
if (mAdapter != null)
{
mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechLists);
}
}
}
Sample code used enableForegroundDispatch function to detect smartcard in NFC field. When smartcard detected, onNewIntent is called.
I want put all of the code in android library module X and use it in Activity Y like
Activity Y extend X
or
X x = new X()
and call it functions. how could i implement it? I have a problem when i want to call
mAdapter = NfcAdapter.getDefaultAdapter(this);
if i use this code:
mAdapter = NfcAdapter.getDefaultAdapter(context);// context pass from Y Activity to X(Android library)
the function
mAdapter.enableForegroundDispatch(this , mPendingIntent, mFilters, mTechLists); // In X (Android library)
doesn't work correctly because it doesn't use Y activity (it used X axtivity). How can i solve my problem such way all code will be in X(android library)?
Thanks.
