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私はどのタイプのコピーNFCタグもエミュレートできるはずのアプリを開発中です。ゼロブロックとページマークからデータを読んだ後、「NFCタイプA」と入力し、メソッドを使用して「MIFAREウルトラライト」（まだ私の所持しているラベルタイプ）：NFCタグタイプAからデータを読み取る際に、「Transceive failed」例外を回避するにはどうすればよいですか？
nfcA.transceive()
と
mifareUltralight.readPages()
残りのデータは読み取れませんが、 "Transceive failed"例外がスローされます。
ここに、適切なメソッドのコードを示します。 NFCAため：MifareUltralighについて
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;
}
：
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;
}
は、それが得られたログフラグメント：
...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
残りのブロック内のデータが利用可能であるという事実は、出力ポート監視プログラムを示します"Arduino 1.8.5"：
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
、アプリケーションは、ラベルタイプ、技術およびUIDのデータを読み取ることができることを実証している： 以下The output data read from the label on its type, technology, and UID
タグから読み取った出力、データの最初の16 bytsを示しています。 MIFARE超軽量のため The output read from the data labels (for NFC type A)
：NFCタイプAについて The output read from the data labels (for MIFARE Ultralight)分かるように、システムは、最初の16 bytsを読み出します。何が間違っていますか？何か考えてください。