如何解决Android 上的 NFC 主机卡仿真 (HCE) 不适用于特定设备
我想开发一个 Android 应用，其中一个设备充当 NFC 标签，另一个移动设备读取它。 我有两个安卓设备，A 和 B - NFC HCE 功能适用于设备 A，即使用正确的 NDEF 数据模拟标签，设备 B 可以读取它。设备 A 的 NFC 标签 (HCE) 的规格是 -
但是现在，当我尝试使用设备 B 执行此操作时，NDEF 数据未写入且设备 A 无法读取。设备 B 的 NFC 标签 (HCE) 的规格为 -
HostApduService代码如下-
package com.example.cn
import android.app.Service
import android.content.Intent
import android.nfc.NdefMessage
import android.nfc.NdefRecord
import android.nfc.cardemulation.HostApduService
import android.os.Bundle
import android.util.Log
import java.io.UnsupportedEncodingException
import java.math.BigInteger
import java.util.*
class CardService : HostApduService() {
private val TAG = "HostApduService"
private val APDU_SELECT = byteArrayOf(
0x00.toByte(),// CLA - Class - Class of instruction
0xA4.toByte(),// INS - Instruction - Instruction code
0x04.toByte(),// P1 - Parameter 1 - Instruction parameter 1
0x00.toByte(),// P2 - Parameter 2 - Instruction parameter 2
0x07.toByte(),// Lc field - Number of bytes present in the data field of the command
0xD2.toByte(),0x76.toByte(),0x00.toByte(),0x85.toByte(),0x01.toByte(),// NDEF Tag Application name
0x00.toByte() // Le field - Maximum number of bytes expected in the data field of the response to the command
)
private val CAPABILITY_CONTAINER_OK = byteArrayOf(
0x00.toByte(),// CLA - Class - Class of instruction
0xa4.toByte(),// INS - Instruction - Instruction code
0x00.toByte(),// P1 - Parameter 1 - Instruction parameter 1
0x0c.toByte(),// P2 - Parameter 2 - Instruction parameter 2
0x02.toByte(),// Lc field - Number of bytes present in the data field of the command
0xe1.toByte(),0x03.toByte() // file identifier of the CC file
)
private val READ_CAPABILITY_CONTAINER = byteArrayOf(
0x00.toByte(),// CLA - Class - Class of instruction
0xb0.toByte(),// P2 - Parameter 2 - Instruction parameter 2
0x0f.toByte() // Lc field - Number of bytes present in the data field of the command
)
// In the scenario that we have done a CC read,the same byte[] match
// for ReadBinary would trigger and we don't want that in succession
private var READ_CAPABILITY_CONTAINER_CHECK = false
private val READ_CAPABILITY_CONTAINER_RESPONSE = byteArrayOf(
0x00.toByte(),0x11.toByte(),// cclEN length of the CC file
0x20.toByte(),// Mapping Version 2.0
0xFF.toByte(),0xFF.toByte(),// MLe maximum
0xFF.toByte(),// MLc maximum
0x04.toByte(),// T field of the NDEF File Control TLV
0x06.toByte(),// L field of the NDEF File Control TLV
0xE1.toByte(),0x04.toByte(),// File Identifier of NDEF file
0xFF.toByte(),0xFE.toByte(),// Maximum NDEF file size of 65534 bytes
0x00.toByte(),// Read access without any security
0xFF.toByte(),// Write access without any security
0x90.toByte(),0x00.toByte() // A_OKAY
)
private val NDEF_SELECT_OK = byteArrayOf(
0x00.toByte(),// Instruction byte (INS) for Select command
0x00.toByte(),// Parameter byte (P1),select by identifier
0x0c.toByte(),select by identifier
0x02.toByte(),// Lc field - Number of bytes present in the data field of the command
0xE1.toByte(),0x04.toByte() // file identifier of the NDEF file retrieved from the CC file
)
private val NDEF_READ_BINARY = byteArrayOf(
0x00.toByte(),// Class byte (CLA)
0xb0.toByte() // Instruction byte (INS) for ReadBinary command
)
private val NDEF_READ_BINARY_NLEN = byteArrayOf(
0x00.toByte(),// Class byte (CLA)
0xb0.toByte(),// Instruction byte (INS) for ReadBinary command
0x00.toByte(),// Parameter byte (P1,P2),offset inside the CC file
0x02.toByte() // Le field
)
private val A_OKAY = byteArrayOf(
0x90.toByte(),// SW1 Status byte 1 - Command processing status
0x00.toByte() // SW2 Status byte 2 - Command processing qualifier
)
private val A_ERROR = byteArrayOf(
0x6A.toByte(),// SW1 Status byte 1 - Command processing status
0x82.toByte() // SW2 Status byte 2 - Command processing qualifier
)
private val NDEF_ID = byteArrayOf(0xE1.toByte(),0x04.toByte())
private var NDEF_URI = NdefMessage(createTextRecord("en","NFC Clock",NDEF_ID))
private var NDEF_URI_BYTES = NDEF_URI.toByteArray()
private var NDEF_URI_LEN = fillByteArrayToFixedDimension(
BigInteger.valueOf(NDEF_URI_BYTES.size.toLong()).toByteArray(),2
)
override fun onStartCommand(intent: Intent,flags: Int,startId: Int): Int {
if (intent.hasExtra("ndefMessage")) {
Log.i(TAG,"Set NFC tag as " + intent.getStringExtra("ndefMessage"))
NDEF_URI =
NdefMessage(createTextRecord("en",intent.getStringExtra("ndefMessage"),NDEF_ID))
NDEF_URI_BYTES = NDEF_URI.toByteArray()
NDEF_URI_LEN = fillByteArrayToFixedDimension(
BigInteger.valueOf(NDEF_URI_BYTES.size.toLong()).toByteArray(),2
)
}
Log.i(TAG,"onStartCommand() | NDEF" + NDEF_URI.records[0].payload);
return Service.START_STICKY
}
override fun processCommandApdu(commandApdu: ByteArray,extras: Bundle?): ByteArray {
//
// The following flow is based on Appendix E "Example of Mapping Version 2.0 Command Flow"
// in the NFC Forum specification
//
Log.i(TAG,"processCommandApdu() | incoming commandApdu: " + commandApdu.toHex())
//
// First command: NDEF Tag Application select (Section 5.5.2 in NFC Forum spec)
//
if (Arrays.equals(APDU_SELECT,commandApdu)) {
Log.i(TAG,"APDU_SELECT triggered. Our Response: " + A_OKAY.toHex())
return A_OKAY
}
//
// Second command: Capability Container select (Section 5.5.3 in NFC Forum spec)
//
if (Arrays.equals(CAPABILITY_CONTAINER_OK,"CAPABILITY_CONTAINER_OK triggered. Our Response: " + A_OKAY.toHex())
return A_OKAY
}
//
// Third command: ReadBinary data from CC file (Section 5.5.4 in NFC Forum spec)
//
if (Arrays.equals(
READ_CAPABILITY_CONTAINER,commandApdu
) && !READ_CAPABILITY_CONTAINER_CHECK
) {
Log.i(
TAG,"READ_CAPABILITY_CONTAINER triggered. Our Response: " + READ_CAPABILITY_CONTAINER_RESPONSE.toHex()
)
READ_CAPABILITY_CONTAINER_CHECK = true
return READ_CAPABILITY_CONTAINER_RESPONSE
}
//
// Fourth command: NDEF Select command (Section 5.5.5 in NFC Forum spec)
//
if (Arrays.equals(NDEF_SELECT_OK,"NDEF_SELECT_OK triggered. Our Response: " + A_OKAY.toHex())
return A_OKAY
}
if (Arrays.equals(NDEF_READ_BINARY_NLEN,commandApdu)) {
// Build our response
val response = ByteArray(NDEF_URI_LEN.size + A_OKAY.size)
System.arraycopy(NDEF_URI_LEN,response,NDEF_URI_LEN.size)
System.arraycopy(A_OKAY,NDEF_URI_LEN.size,A_OKAY.size)
Log.i(TAG,"NDEF_READ_BINARY_NLEN triggered. Our Response: " + response.toHex())
READ_CAPABILITY_CONTAINER_CHECK = false
return response
}
if (Arrays.equals(commandApdu.sliceArray(0..1),NDEF_READ_BINARY)) {
val offset = commandApdu.sliceArray(2..3).toHex().toInt(16)
val length = commandApdu.sliceArray(4..4).toHex().toInt(16)
val fullResponse = ByteArray(NDEF_URI_LEN.size + NDEF_URI_BYTES.size)
System.arraycopy(NDEF_URI_LEN,fullResponse,NDEF_URI_LEN.size)
System.arraycopy(
NDEF_URI_BYTES,NDEF_URI_BYTES.size
)
Log.i(TAG,"NDEF_READ_BINARY triggered. Full data: " + fullResponse.toHex())
Log.i(TAG,"READ_BINARY - OFFSET: " + offset + " - LEN: " + length)
val slicedResponse = fullResponse.sliceArray(offset until fullResponse.size)
// Build our response
val realLength = if (slicedResponse.size <= length) slicedResponse.size else length
val response = ByteArray(realLength + A_OKAY.size)
System.arraycopy(slicedResponse,realLength)
System.arraycopy(A_OKAY,realLength,"NDEF_READ_BINARY triggered. Our Response: " + response.toHex())
READ_CAPABILITY_CONTAINER_CHECK = false
return response
}
//
// We're doing something outside our scope
//
Log.wtf(TAG,"processCommandApdu() | I don't kNow what's going on!!!")
return A_ERROR
}
override fun onDeactivated(reason: Int) {
Log.i(TAG,"onDeactivated() Fired! Reason: $reason")
}
private val HEX_CHARS = "0123456789ABCDEF".tochararray()
fun ByteArray.toHex(): String {
val result = StringBuffer()
forEach {
val octet = it.toInt()
val firstIndex = (octet and 0xF0).ushr(4)
val secondindex = octet and 0x0F
result.append(HEX_CHARS[firstIndex])
result.append(HEX_CHARS[secondindex])
}
return result.toString()
}
fun String.hexStringToByteArray(): ByteArray {
val result = ByteArray(length / 2)
for (i in 0 until length step 2) {
val firstIndex = HEX_CHARS.indexOf(this[i]);
val secondindex = HEX_CHARS.indexOf(this[i + 1]);
val octet = firstIndex.shl(4).or(secondindex)
result.set(i.shr(1),octet.toByte())
}
return result
}
fun createTextRecord(language: String,text: String,id: ByteArray): NdefRecord {
val languageBytes: ByteArray
val textBytes: ByteArray
try {
languageBytes = language.toByteArray(charset("US-ASCII"))
textBytes = text.toByteArray(charset("UTF-8"))
} catch (e: UnsupportedEncodingException) {
throw AssertionError(e)
}
val recordPayload = ByteArray(1 + (languageBytes.size and 0x03F) + textBytes.size)
recordPayload[0] = (languageBytes.size and 0x03F).toByte()
System.arraycopy(languageBytes,recordPayload,1,languageBytes.size and 0x03F)
System.arraycopy(
textBytes,1 + (languageBytes.size and 0x03F),textBytes.size
)
return NdefRecord(NdefRecord.TNF_WELL_KNowN,NdefRecord.RTD_TEXT,id,recordPayload)
}
fun fillByteArrayToFixedDimension(array: ByteArray,fixedSize: Int): ByteArray {
if (array.size == fixedSize) {
return array
}
val start = byteArrayOf(0x00.toByte())
val filledArray = ByteArray(start.size + array.size)
System.arraycopy(start,filledArray,start.size)
System.arraycopy(array,start.size,array.size)
return fillByteArrayToFixedDimension(filledArray,fixedSize)
}
}
（得到了this的帮助）
使用的 AID -
<aid-filter android:name="D2760000850101"/>
编辑： NXP TagInfo 在读取设备 B-ScreenShot
的标签时显示此内容编辑：这可能与 NFC TAG B 相关吗？
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