public int readNfcV(Tag tag) throws Exception {
if (tag == null) {
callbackContext.error("NULL");
}
byte[] response = new byte[4];
NfcV nfcv = NfcV.get(tag);
if (nfcv != null) {
try {
nfcv.connect();
byte[] request =
new byte[] {
(byte) 0x00, // flag
(byte) 0x20, // command: READ ONE BLOCK
(byte) block // IMMER im gleichen Block
};
response = nfcv.transceive(request);
} catch (IOException e) {
callbackContext.error(nfcv.toString());
} finally {
try {
nfcv.close();
} catch (IOException e) {
}
}
}
// 1. Byte: Block locking status
byte[] value = new byte[] {response[1], response[2], response[3], response[4]};
return ByteBuffer.wrap(value).order(java.nio.ByteOrder.BIG_ENDIAN).getInt();
}
public void writeNfcV(Tag tag, int oldValue, int newValue) throws Exception {
int currentValue = readNfcV(tag);
if (((oldValue != -1) && (oldValue != 0) && (currentValue != oldValue))
|| (((oldValue == -1) || (oldValue == 0)) && ((currentValue != 0) && currentValue != -1))) {
callbackContext.error(FALSE_TAG);
return;
}
byte[] data = ByteBuffer.allocate(4).putInt(newValue).array();
if (tag == null) {
callbackContext.error("NULL");
return;
}
NfcV nfcv = NfcV.get(tag);
nfcv.connect();
byte[] request = new byte[7];
request[0] = 0x00; // flag
request[1] = 0x21; // command: WRITE ONE BLOCK
request[2] = (byte) block; // IMMER im gleichen Block speichern
request[3] = (byte) data[0];
request[4] = (byte) data[1];
request[5] = (byte) data[2];
request[6] = (byte) data[3];
try {
byte[] response = nfcv.transceive(request);
if (response[0] != (byte) 0x00) {
callbackContext.error("Error code: " + response[1]);
}
} catch (IOException e) {
if (e.getMessage().equals("Tag was lost.")) {
// continue, because of Tag bug
} else {
callbackContext.error("Couldn't write on Tag");
throw e;
}
}
nfcv.close();
int result = readNfcV(tag);
PluginResult pluginResult = new PluginResult(PluginResult.Status.OK, result);
callbackContext.sendPluginResult(pluginResult);
}
public void onNewIntent(Intent intent) {
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
byte[] id = tag.getId();
NfcV nfcMessage = NfcV.get(tag);
try {
nfcMessage.connect();
int resultIndex = 0;
int blockIndex = 0;
int blocks = 4; // 0 means 1 block, so it's +1 than 'blocks'
byte[] cmd =
new byte[] {
(byte) 0x60,
(byte) 0x23,
(byte) 0x00,
(byte) 0x00,
(byte) 0x00,
(byte) 0x00,
(byte) 0x00,
(byte) 0x00,
(byte) 0x00,
(byte) 0x00, // placeholder for tag UID
(byte) blockIndex,
(byte) blocks
};
System.arraycopy(id, 0, cmd, 2, 8);
byte[] data = nfcMessage.transceive(cmd);
int start = 2;
byte[] results = new byte[data.length];
for (int i = 0; i <= blocks; i++) {
for (int b = start; b < start + 4; b++) {
// First data block may contain zero bytes, which does not denote end of book code.
// this caused troubles with some books
if (data[b] == 0 && i > 1) {
break;
}
results[resultIndex] = data[b];
resultIndex++;
}
start += 5;
}
nfcMessage.close();
results = ArrayUtils.subarray(results, 3, resultIndex);
String res = new String(results);
HashMap<String, String> temp = new HashMap<String, String>();
temp.put("sent", "false");
temp.put("to_send", "false");
temp.put("code", res);
dataList.add(0, temp);
adapter.notifyDataSetChanged();
this.toast.cancel();
BookAsyncProcessor p =
new BookAsyncProcessor(adapter, sharedPref.getString("service_url", ""));
p.execute(temp);
} catch (IOException e) {
this.toast.show();
}
}