android 通过NFC读写15693格式的RFID标签
首先需要在Manifest文件中添加权限<uses-permission android:name="android.permission.NFC" /><uses-permission android:name="android.permission.NFC_PREFERRED_PAYMENT_INFO" />NFC根据不同标签类型
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首先需要在Manifest文件中添加权限 <uses-permission android:name="android.permission.NFC" /> <uses-permission android:name="android.permission.NFC_PREFERRED_PAYMENT_INFO" />
NFC根据不同标签类型分为NfcA（操作14443-3A）、NfcB（操作14443-3B）、NfcF（操作JIS 6319-4）、NfcV（操作15693）。
下面主要介绍NfcV 15693的读写方法。
在activity页面中添加
NfcV nfcV;
NfcVUtil util;
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
resolveIntent(intent);
}
private void resolveIntent(Intent intent) {
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
if (tag != null) {
//获取卡id这里即uid
byte[] aa = tag.getId();
String str = ByteArrayToHexString(aa);//
String UID = flipHexStr(str);
Toast.makeText(context,"RFID已经连接，可以开始读写 UID:" + ID,
Toast.LENGTH_SHORT).show();
try {
nfcV = NfcV.get(tag);
if(nfcV != null) {
nfcV.connect();//建立连接
util = new NfcVUtil(nfcV);//创建工具类，操作连接
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/*
* 写入RFID卡数据，
*
* @param v
*/
public void write(){
if(!isEnable()){
return;
}
try {
String info = etIdinput.getText().toString();
String writeStr = //为a-f的8长度的字符串，转换成byte数组长度为4。
//第一个参数为块索引，第二个参数为4长度的byte数组。如数据不够，需要补位
util.writeBlock(0,util.hexStringToBytes(writeStr));
} catch (IOException e) {
e.printStackTrace();
}
}
public void read(){
if(!isEnable()){
return;
}
try {
String readOneBlockStr = util.readOneBlock(i);//读取block在1位置的内容
//("读取结果 : " + result ,ctx);
} catch (IOException e) {
e.printStackTrace();
}
}
private boolean isEnable(){
if(util == null){
//请先连接RFID卡
return false;
}
if(nfcV ==null){
//请先连接RFID卡
return false;
}
if(!nfcV.isConnected()){
//接连中断，请重新连接
return false;
}
return true;
}工具类NfcVUtil
import android.nfc.tech.NfcV;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
public class NfcVUtil {
private NfcV mNfcV;
/**UID数组行式*/
private byte[] ID;
private String UID;
private String DSFID;
private String AFI;
/**block的个数*/
private int blockNumber;
/**一个block长度*/
private int oneBlockSize;
/**信息*/
private byte[] infoRmation;
/**
* 初始化
* @param mNfcV NfcV对象
* @throws IOException
*/
public NfcVUtil(NfcV mNfcV) throws IOException{
this.mNfcV = mNfcV;
ID = this.mNfcV.getTag().getId();
byte[] uid = new byte[ID.length];
int j = 0;
for(int i = ID.length - 1; i >=0; i-- ){
uid[j] = ID[i];
j++;
}
this.UID = printHexString(uid);
getInfoRmation();//获取标签的信息
}
public String getUID() {
return UID;
}
/**
* 取得标签信息
*/
private byte[] getInfoRmation() throws IOException{
byte[] cmd = new byte[10];
cmd[0] = (byte) 0x22; // flag
cmd[1] = (byte) 0x2B; // command
System.arraycopy(ID, 0, cmd, 2, ID.length); // UID
infoRmation = mNfcV.transceive(cmd);
blockNumber = infoRmation[12];//可使用的数据块数量，一般为27
oneBlockSize = infoRmation[13];//每个块byte数组的长度，一般为4
AFI = printHexString(new byte[]{infoRmation[11]});//AFI值在某些领域会需要使用
DSFID = printHexString(new byte[]{infoRmation[10]});//DSFID值
return infoRmation;
}
/**
* 写入AFI数据
* @param b
* @return
* @throws IOException
*/
public boolean setAFIState(byte b) throws IOException {
byte[] cmd = new byte[11];
cmd[0] = (byte) 0x22; // flag
cmd[1] = (byte) 0x27; // command
System.arraycopy(ID, 0, cmd, 2, ID.length); // UID
cmd[10] = b;
byte[] res = mNfcV.transceive(cmd);
if(res[0] == 0x00){
byte[] cmdNew = new byte[10];
cmdNew[0] = (byte) 0x22; // flag
cmdNew[1] = (byte) 0x2B; // command
System.arraycopy(ID, 0, cmdNew, 2, ID.length); // UID
AFI = printHexString(new byte[]{infoRmation[11]});
DSFID = printHexString(new byte[]{infoRmation[10]});
return true;
//千万不要锁定，不可逆
// byte[] cmd2 = new byte[10];
// cmd2[0] = (byte) 0x22; // flag
// cmd2[1] = (byte) 0x28; // command
// System.arraycopy(ID, 0, cmd2, 2, ID.length); // UID
// byte[] res2 = mNfcV.transceive(cmd2);
// if(res2[0] == 0x00){
// return true;
// }
}
return false;
}
/**
* 写入DSFID数据
* @param b
* @return
* @throws IOException
*/
public boolean setDSFIDState(byte b) throws IOException {
byte[] cmd = new byte[11];
cmd[0] = (byte) 0x22; // flag
cmd[1] = (byte) 0x29; // command
System.arraycopy(ID, 0, cmd, 2, ID.length); // UID
cmd[10] = b;
byte[] res = mNfcV.transceive(cmd);
if(res[0] == 0x00){
byte[] cmdNew = new byte[10];
cmdNew[0] = (byte) 0x22; // flag
cmdNew[1] = (byte) 0x2B; // command
System.arraycopy(ID, 0, cmdNew, 2, ID.length); // UID
AFI = printHexString(new byte[]{infoRmation[11]});
DSFID = printHexString(new byte[]{infoRmation[10]});
return true;
//千万不要锁定，不可逆
// byte[] cmd2 = new byte[10];
// cmd2[0] = (byte) 0x22; // flag
// cmd2[1] = (byte) 0x2A; // command
// System.arraycopy(ID, 0, cmd2, 2, ID.length); // UID
// byte[] res2 = mNfcV.transceive(cmd2);
// if(res2[0] == 0x00){
// return true;
// }
}
return false;
}
public String getDSFID() {
return DSFID;
}
public String getAFI() {
String temp = String.valueOf(mNfcV.getDsfId());
// return AFI;
return temp + AFI;
}
/**
* 读取一个位置在position的block
* @param position 要读取的block位置
* @return 返回内容字符串
* @throws IOException
*/
public String readOneBlock(int position) throws IOException{
byte cmd[] = new byte[12];
cmd[0] = (byte) 0x22;
cmd[1] = (byte) 0x23;//0x20
System.arraycopy(ID, 0, cmd, 2, ID.length); // UID
cmd[10] = (byte) position;
cmd[11] = (byte) 0;
byte res[] = mNfcV.transceive(cmd);
if(res[0] == 0x00){
byte block[] = new byte[res.length - 1];
System.arraycopy(res, 1, block, 0, res.length - 1);
return printHexString(block);
}
return null;
}
/**
* String转Hex格式Byte[]
* @param hexString
* @return
*/
public byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
private static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
/**
* 将byte[]转换成16进制字符串
* @param data 要转换成字符串的字节数组
* @return 16进制字符串
*/
private String printHexString(byte[] data) {
StringBuffer s = new StringBuffer();;
for (int i = 0; i < data.length; i++) {
String hex = Integer.toHexString(data[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
s.append(hex);
}
return s.toString();
}
//结果大写
private String ByteArrayToHexString(byte[] inarray) {
int i, j, in;
String[] hex = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",
"B", "C", "D", "E", "F" };
String out = "";
for (j = inarray.length - 1; j >= 0 ; j--) {
in = (int) inarray[j] & 0xff;
i = (in >> 4) & 0x0f;
out += hex[i];
i = in & 0x0f;
out += hex[i];
}
return out;
}
/**
* 将数据写入到block,
* @param position 要写内容的block位置
* @param data 要写的内容,必须长度为blockOneSize
* @return false为写入失败，true为写入成功
* @throws IOException
*/
public boolean writeBlock(int position, byte[] data) throws IOException{
byte cmd[] = new byte[15];
cmd[0] = (byte) 0x22;
cmd[1] = (byte) 0x21;
System.arraycopy(ID, 0, cmd, 2, ID.length); // UID
//block
cmd[10] = (byte) position;
//value
System.arraycopy(data, 0, cmd, 11, data.length);
byte[]rsp = mNfcV.transceive(cmd);
if(rsp[0] == 0x00)
return true;
return false;
}
}
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