NfcV(ISO 15693)读写操作
NfcV(ISO 15693)读写操作
package com.wanry;
import java.io.IOException;
import android.nfc.tech.NfcV;
/**
*
* @author cloin
* 用法
* NfcV mNfcV = NfcV.get(tag);
* mNfcV.connect();
* NfcVUtil mNfcVutil = new NfcVUtil(mNfcV);
* 取得UID
* mNfcVutil.getUID();
* 读取block在1位置的内容
* mNfcVutil.readOneBlock(1);
* 从位置7开始读2个block的内容
* mNfcVutil.readBlocks(7, 2);
* 取得block的个数
* mNfcVutil.getBlockNumber();
* 取得1个block的长度
* mNfcVutil.getOneBlockSize();
* 往位置1的block写内容
* mNfcVutil.writeBlock(1, new byte[]{0, 0, 0, 0})
*/
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();
}
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];
oneBlockSize = infoRmation[13];
AFI = printHexString(new byte[]{infoRmation[11]});
DSFID = printHexString(new byte[]{infoRmation[10]});
return infoRmation;
}
public String getDSFID() {
return DSFID;
}
public String getAFI() {
return AFI;
}
public int getBlockNumber(){
return blockNumber + 1;
}
public int getOneBlockSize() {
return oneBlockSize + 1;
}
/**
* 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[11];
cmd[0] = (byte) 0x22;
cmd[1] = (byte) 0x20;
System.arraycopy(ID, 0, cmd, 2, ID.length); // UID
cmd[10] = (byte) position;
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;
}
/**
* 读取从begin开始end个block
* begin + count 不能超过blockNumber
* @param begin block开始位置
* @param count 读取block数量
* @return 返回内容字符串
* @throws IOException
*/
public String readBlocks(int begin, int count) throws IOException{
if((begin + count) > blockNumber){
count = blockNumber - begin;
}
StringBuffer data = new StringBuffer();
for(int i = begin; i < count + begin; i++){
data.append(readOneBlock(i));
}
return data.toString();
}
/**
* 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();
}
/**
* 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) 0x02;
//value
System.arraycopy(data, 0, cmd, 11, data.length);
byte[]rsp = mNfcV.transceive(cmd);
if(rsp[0] == 0x00)
return true;
return false;
}
}