Java 使用MifareUltralight.transceive在Android中设置NTAG213密码时崩溃,未引发异常
我试图在空的NTAG213标签上设置密码,但是当我开始写包和PWD时,我的应用程序崩溃了,没有异常抛出。我确实让我的应用程序写了足够多的有效NDEF消息并阅读了这些消息,似乎我还可以写入其他配置页面(2Ah和29h用于配置密码保护)。不过,当我开始编写软件包时,我的应用程序崩溃了,但没有抛出MifareUltralight.transceive(byte[]数据)中预期的IOException 以下是我的writeAndProtect方法的源代码:Java 使用MifareUltralight.transceive在Android中设置NTAG213密码时崩溃,未引发异常,java,android,nfc,password-protection,mifare,Java,Android,Nfc,Password Protection,Mifare,我试图在空的NTAG213标签上设置密码,但是当我开始写包和PWD时,我的应用程序崩溃了,没有异常抛出。我确实让我的应用程序写了足够多的有效NDEF消息并阅读了这些消息,似乎我还可以写入其他配置页面(2Ah和29h用于配置密码保护)。不过,当我开始编写软件包时,我的应用程序崩溃了,但没有抛出MifareUltralight.transceive(byte[]数据)中预期的IOException 以下是我的writeAndProtect方法的源代码: private void writeAndPr
private void writeAndProtectTag(final Intent intent, final String message) {
// Run the entire process in its own thread as MifareUltralight.transceive(byte[] data);
// Should not be run in main thread according to <https://developer.android.com/reference/android/nfc/tech/MifareUltralight.html#transceive(byte[])>
(new Thread(new Runnable() {
// Password has to be 4 characters
// Password Acknowledge has to be 2 characters
byte[] pwd = "-_bA".getBytes();
byte[] pack = "cC".getBytes();
@Override
public void run() {
// Store tag object for use in MifareUltralight and Ndef
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
MifareUltralight mifare = null;
int debugCounter = 0;
// Whole process is put into a big try-catch trying to catch the transceive's IOException
try {
mifare = MifareUltralight.get(tag);
mifare.connect();
while(!mifare.isConnected());
byte[] response;
// Authenticate with the tag first
// In case it's already been locked
try {
response = mifare.transceive(new byte[]{
(byte) 0x1B, // PWD_AUTH
pwd[0], pwd[1], pwd[2], pwd[3]
});
// Check if PACK is matching expected PACK
// This is a (not that) secure method to check if tag is genuine
if ((response != null) && (response.length >= 2)) {
byte[] packResponse = Arrays.copyOf(response, 2);
if (!(pack[0] == packResponse[0] && pack[1] == packResponse[1])) {
Toast.makeText(ctx, "Tag could not be authenticated:\n" + packResponse.toString() + "≠" + pack.toString(), Toast.LENGTH_LONG).show();
}
}
}catch(IOException e){
e.printStackTrace();
}
// Get Page 2Ah
response = mifare.transceive(new byte[] {
(byte) 0x30, // READ
(byte) 0x2A // page address
});
// configure tag as write-protected with unlimited authentication tries
if ((response != null) && (response.length >= 16)) { // read always returns 4 pages
boolean prot = false; // false = PWD_AUTH for write only, true = PWD_AUTH for read and write
int authlim = 0; // 0 = unlimited tries
mifare.transceive(new byte[] {
(byte) 0xA2, // WRITE
(byte) 0x2A, // page address
(byte) ((response[0] & 0x078) | (prot ? 0x080 : 0x000) | (authlim & 0x007)), // set ACCESS byte according to our settings
0, 0, 0 // fill rest as zeros as stated in datasheet (RFUI must be set as 0b)
});
}
// Get page 29h
response = mifare.transceive(new byte[] {
(byte) 0x30, // READ
(byte) 0x29 // page address
});
// Configure tag to protect entire storage (page 0 and above)
if ((response != null) && (response.length >= 16)) { // read always returns 4 pages
int auth0 = 0; // first page to be protected
mifare.transceive(new byte[] {
(byte) 0xA2, // WRITE
(byte) 0x29, // page address
response[0], 0, response[2], // Keep old mirror values and write 0 in RFUI byte as stated in datasheet
(byte) (auth0 & 0x0ff)
});
}
// Send PACK and PWD
// set PACK:
mifare.transceive(new byte[] {
(byte)0xA2,
(byte)0x2C,
pack[0], pack[1], 0, 0 // Write PACK into first 2 Bytes and 0 in RFUI bytes
});
// set PWD:
mifare.transceive(new byte[] {
(byte)0xA2,
(byte)0x2B,
pwd[0], pwd[1], pwd[2], pwd[3] // Write all 4 PWD bytes into Page 43
});
} catch (IOException e) {
//Trying to catch any exception that may be thrown
e.printStackTrace();
} catch (Exception e) {
//Trying to catch any exception that may be thrown
e.printStackTrace();
}
try {
mifare.close();
} catch (IOException e) {
e.printStackTrace();
}
// Generate NdefMessage to be written onto the tag
NdefMessage msg = null;
try {
NdefRecord r1 = NdefRecord.createMime("text/plain", message.getBytes("UTF-8"));
NdefRecord r2 = NdefRecord.createApplicationRecord("com.example.myname.myapplication");
msg = new NdefMessage(r1, r2);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
// Generate Ndef object from tag object
Ndef ndef = Ndef.get(tag);
// Connect NDEF, write message and close connection
try {
ndef.connect();
ndef.writeNdefMessage(msg);
ndef.close();
} catch (IOException e) {
e.printStackTrace();
} catch (FormatException e) {
e.printStackTrace();
} catch (Exception e) {
//Trying to catch any exception that may be thrown
e.printStackTrace();
}
runOnUiThread(new Runnable() {
@Override
public void run() {
btn.setImageResource(R.drawable.arrow_red);
tv.setText("");
}
});
curAction = "handle";
}
})).start();
}
我不太明白为什么会发生这种情况,因为首先我连接mifare,等待它连接,进行收发,关闭mifare,然后调用带有ndef.connect()的块。这是否意味着在我的收发模块的某个地方出现异常,因此我没有正确关闭mifare,无法打开ndef?这会很奇怪,因为我没有得到异常,即使我将IOException换成了just exception,所以我捕获每个异常,不管是什么类型的异常
编辑2:我现在了解应用程序以此异常结束的原因。代码实际上是有效的,我的标签现在受到密码的保护,当我再次尝试使用同一个标签时,我不会首先进行身份验证,因此收发器失败,导致try-catch块中断,该块也包含close函数。我通过使MifareUltralight对象在整个线程中可用并在运行ndef.connect()部分之前关闭它来解决这个问题
现在我(希望)的最后一个问题是:我可以使用Ndef类进行身份验证吗?我的Ndef对象似乎没有身份验证方法,因此我不得不再次使用MifareUltralight进行验证。但是,当我关闭MifareUltralight连接以打开Ndef连接时,身份验证是否没有丢失?或者,我唯一可以在密码保护的标签上使用
字符串,将它们剪切成4字节的页面,然后使用MifareUltralight.writepage(byte[]addr,byte[]data)逐个写入它们?当我使用上面更新的文件时,我从ndef.writeNdefMessage()得到一个IOException,我想这意味着关闭mifare连接也会取消我的权限
提前感谢。使用MifareUltralight技术时,您从未连接到标签。因此,调用
mifare.transceive()
将导致异常。您的应用程序崩溃,因为此异常可能不是IOException
的实例(您可能会在代码中捕获到)
因此,一定要打电话
mifare.connect();
在收发任何命令之前,请确保在此之后再次关闭实例:
try {
mifare.close();
} catch (Exception ignored) {}
你能澄清一下“崩溃,没有异常抛出”是什么意思吗?你的应用程序是冻结还是崩溃(关闭)?在后一种情况下,您可能确实得到了一个异常(只是不是您试图捕获的异常)…应用程序实际上关闭(应用程序停止工作屏幕),而我没有捕获正确的异常。设置密码和确认之前的收发器命令也不起作用,不知何故它们不会崩溃。当我扫描我试图用NFC TagInfo应用程序写入的标记时,其configbytes中的位未设置。我知道程序在mifare.transceive(新字节[]{(字节)0xA2,(字节)0x2C,pack[0],pack[1]时崩溃,0,0//将数据包写入前2个字节,将0写入RFUI字节});因为我在代码中有调试行,当应用程序崩溃时,我收到的最后一条调试消息就是这个命令上面的消息。谢谢你的回答,我明天早上再次访问PC时会尝试。非常感谢你在这方面的帮助,我现在更新了第一篇帖子(实际上更新了两次)。我的最后一个问题是:我可以避免使用MifareUltralight.writePage(addr,data)来验证和编写ndef吗?我真的更喜欢使用Ndef类编写ndefMessage。嗨,我使用上面的代码段使用密码保护NFC标记,但我在这里得到了TagLostException:
response=mifare.transceive(新字节[]{(字节)0x1B,//PWD_AUTH PWD[0],PWD[1],PWD[2],PWD[3]})你能帮我吗?
try {
mifare.close();
} catch (Exception ignored) {}