我正在开发一款应该可以模拟任何类型的NFC标签的应用程序。从零块和页面标记中读取数据类型＆＃34; NFC类型A＆＃34;和＆＃34; MIFARE Ultralight＆＃34; （我所拥有的标签类型）使用方法：
nfcA.transceive()
和
mifareUltralight.readPages()
其他数据无法读取，但会抛出异常＆＃34; Transceive失败＆＃34;。
以下是适当方法的代码。对于NfcA：
private static ArrayList<IdNameValue> readeNfcADataset(final Tag tag, final Context cxt) {
String excMsg = "";
ArrayList<IdNameValue> dataSet = new ArrayList<>();
NfcA nfcA = NfcA.get(tag);
if (nfcA != null) {
dataSet.add(new IdNameValue(cxt.getString(R.string.atqa) + " ",
"0x" + byteArrayToHexString(nfcA.getAtqa())));
dataSet.add(new IdNameValue(cxt.getString(R.string.sak) + " ",
"0x" + shortToHexString(nfcA.getSak())));
byte blockNumber = 0x00;
int bytesNumber = 1, pagesNumber = 16, counter = 0;
byte[][] bytes = new byte[pagesNumber][bytesNumber];
excMsg = "_________________________________________________\n" +
cxt.getString(R.string.picc_compliant_with_iso_iec_14443_3A_fnca) + ":";
Log.i(TAG, excMsg);
for (int i = 0; i < pagesNumber; i++) {
excMsg = "";
while (!nfcA.isConnected()) {
try {
nfcA.connect();
excMsg = cxt.getString(R.string.connecting_to_tag_has_been_created);
Log.i(TAG, 109 + ": " + excMsg);
bytes[i] = nfcA.transceive(new byte[]{
(byte) 0x30, // READ
(byte) (blockNumber & 0x0FF)
});
excMsg = cxt.getString(R.string.made_to_read_data_from_a_block)
+ Integer.toHexString(blockNumber);
Log.i(TAG, 117 + ": " + excMsg);
if (nfcA.isConnected()) nfcA.close();
excMsg += cxt.getString(R.string.tag_has_been_closed);
break;
} catch (IOException e) {
counter++;
excMsg = e.getMessage() + ":> " + (excMsg.equals("") ?
cxt.getString(R.string.the_connection_tag_is_not_created) :
(excMsg.contains(cxt.getString(R.string.connecting_to_tag_has_been_created)) ||
excMsg.contains(cxt.getString(R.string.made_to_read_data_from_a_page))) ?
"Failed to read data from a tag block: "
+ Integer.toHexString(blockNumber) :
cxt.getString(R.string.error_closing_tag));
Log.e(TAG, 130 + ": " + excMsg);
}
if (nfcA.isConnected()) try {
nfcA.close();
} catch (IOException e1) {
excMsg += (":> " + e1.getMessage());
Log.e(TAG, 137 + ": " + excMsg);
}
if (counter > 9) {
excMsg = cxt.getString(R.string.the_number_of_connection_attempts_exceeded_the_number_of_ten);
Log.e(TAG, 143 + ": " + excMsg);
break;
}
}
counter = 0;
blockNumber += (byte) bytes[i].length;
}
if (excMsg.equals(cxt.getString(R.string.the_number_of_connection_attempts_has_exceeded_one_hundred))) {
dataSet.add(new IdNameValue("Error", " reading the data tag"));
return dataSet;
}
dataSet.add(new IdNameValue("Page", " 0 1 2 3"));
String name = "";
String value = "";
for (int i = 0; i < pagesNumber; i++) {
if (!value.equals("")) dataSet.add(new IdNameValue(name, value));
name = (i > 9 ? " " : " ") + String.valueOf(i) + " ";
value = "";
for (int j = 0; j < bytes[i].length; j++) {
value += (" " + byteToHexString(bytes[i][j]));
}
}
dataSet.add(new IdNameValue(name, value));
return dataSet;
}
return dataSet;
}
对于MifareUltraligh：
private static ArrayList<IdNameValue> readeMifareUltralightDataset(final Tag tag, final Context cxt) {
MifareUltralight mifareUltralight = MifareUltralight.get(tag);
String excMsg = "";
int bytesNumber = 1, pagesNumber = 4, counter = 0, startBlock;
byte[][] bytes = new byte[pagesNumber][bytesNumber];
startBlock = 0x00;
excMsg = "_________________________________________________\n" +
cxt.getString(R.string.mifare_ultralight_or_ultralight_c) + ":";
Log.i(TAG, excMsg);
for (int i = 0; i < pagesNumber; i++) {
while (!mifareUltralight.isConnected()) {
excMsg = "";
try {
mifareUltralight.connect();
excMsg = cxt.getString(R.string.connecting_to_tag_has_been_created);
Log.i(TAG, 201 + ": " + excMsg);
bytes[i] = mifareUltralight.readPages(startBlock);
excMsg = cxt.getString(R.string.done_reading_pages_twice_blocks)
+ Integer.toHexString(startBlock) + " - "
+ Integer.toHexString((startBlock + bytes[i].length) - 1);
Log.i(TAG, 207 + ": " + excMsg);
if (mifareUltralight.isConnected()) mifareUltralight.close();
excMsg = cxt.getString(R.string.tag_has_been_closed);
Log.i(TAG, 210 + ": " + excMsg);
break;
} catch (IOException e) {
counter++;
excMsg = e.getMessage() + ":> " + (excMsg.equals("") ?
cxt.getString(R.string.the_connection_tag_is_not_created) :
(excMsg.contains(cxt.getString(R.string.connecting_to_tag_has_been_created)) ||
excMsg.contains(cxt.getString(R.string.done_reading_pages_twice_blocks)) ?
"Failed to read page from tag blocks: "
+ Integer.toHexString(startBlock) + " - "
+ Integer.toHexString(startBlock + bytes[i].length - 1) :
cxt.getString(R.string.error_closing_tag)));
Log.e(TAG, 222 + ": " + excMsg);
}
if (mifareUltralight.isConnected()) try {
mifareUltralight.close();
break;
} catch (IOException e) {
excMsg = (":> " + e.getMessage());
Log.e(TAG, 230 + ": " + excMsg);
}
if (counter > 9) {
excMsg = cxt.getString(R.string.the_number_of_connection_attempts_exceeded_the_number_of_ten);
Log.e(TAG, 236 + ": " + excMsg);
break;
}
}
counter = 0;
startBlock += bytes[i].length;
}
ArrayList<IdNameValue> dataSet = new ArrayList<>();
if (excMsg.equals(cxt.getString(R.string.the_number_of_connection_attempts_has_exceeded_one_hundred))) {
dataSet.add(new IdNameValue("Error", " reading the data tag"));
return dataSet;
}
dataSet.add(new IdNameValue("Page", " 0 1 2 3"));
int n = -1;
String name = "";
String value = "";
for (int i = 0; i < pagesNumber; i++) {
for (int j = 0; j < bytes[i].length; j++) {
if (j % 4 == 0) {
n++;
if (!value.equals("")) dataSet.add(new IdNameValue(name, value));
name = (n > 9 ? " " : " ") + String.valueOf(n) + " ";
value = "";
}
value += (" " + byteToHexString(bytes[i][j]));
}
}
dataSet.add(new IdNameValue(name, value));
return dataSet;
}
它会对生成的日志进行分段：
...cardreader I/TagController: _________________________________________________
PICC compliant with ISO/IEC 14443-3A (NFCA):
...cardreader I/TagController: 109: The connecting to tag has been created
...cardreader I/TagController: 117: Made to read data from a block: 0
...cardreader I/TagController: 109: The connecting to tag has been created
...cardreader E/TagController: 130: Transceive failed:> Failed to read data from a tag block: 10
...cardreader I/TagController: 109: The connecting to tag has been created
...cardreader E/TagController: 130: Transceive failed:> Failed to read data from a tag block: 10
...........................................................
...cardreader I/TagController: 109: The connecting to tag has been created
...cardreader E/TagController: 130: Transceive failed:> Failed to read data from a tag block: 1e
...cardreader E/TagController: 143: The number of connection attempts exceeded the number of ten.
...cardreader I/TagController: _________________________________________________
MIFARE Ultralight or Ultralight C:
...cardreader I/TagController: 201: The connecting to tag has been created
...cardreader I/TagController: 207: Done reading pages twice blocks:0 - f
...cardreader I/TagController: 210: Tag has been closed
...cardreader I/TagController: 201: The connecting to tag has been created
...cardreader E/TagController: 222: Transceive failed:> Failed to read page from tag blocks: 10 - 10
...cardreader I/TagController: 201: The connecting to tag has been created
...cardreader E/TagController: 222: Transceive failed:> Failed to read page from tag blocks: 11 - 11
...cardreader I/TagController: 201: The connecting to tag has been created
...cardreader E/TagController: 222: Transceive failed:> Failed to read page from tag blocks: 12 - 12
剩余块中的数据可用的事实显示了输出端口监视程序＆＃34; Arduino 1.8.5＆＃34;：
Card UID: 04 3A 31 02 54 2E 82
Card SAK: 00
PICC type: MIFARE Ultralight or Ultralight C
Page 0 1 2 3
0 04 3A 31 87
1 02 54 2E 82
2 FA 48 F0 00
3 FF FF FF FC
4 45 D9 B0 49
5 9E 6A 2D 00
6 1E 82 00 00
7 1E 82 00 00
8 1E 7E 05 00
9 40 00 08 09
10 B7 DD DB FF
11 1E 7E 98 48
12 1E 7E 05 00
13 40 00 08 09
14 B7 DD DB FF
15 1E 7E 98 48
在下面的屏幕截图中，应用程序演示了标签允许读取类型，技术和UID上的数据： The output data read from the label on its type, technology, and UID
下面显示了从标签读取的输出，前16位数据。 对于NFC A型： The output read from the data labels (for NFC type A)
对于MIFARE Ultralight： The output read from the data labels (for MIFARE Ultralight) 可以看出，系统只读取第一个16个字节。可能有什么不对？请任何想法。
答案 0 :(得分：0)
长期查看文档，即"MF0ICU1 MIFARE Ultralight contactless single-ticket IC" / Rev. 3.9 — 23 July 2014 #028639和"MF0ICU2 MIFARE Ultralight C" / Rev. 3.2 — 19 May 2009 #171432，最终了解问题：块寻址中的所有salt都提供给命令输入READE。类型标签NFCA的数字块的计算应如下所示：
blockNumber = (byte) (i * 4);
和标签类型Mifare Ultralight：
startBlock = i * 4;
然后一切都开始了。