android NfcV(ISO 15693)读写操作

转载：http://www.eoeandroid.com/home.php?mod=space&uid=638603&do=blog&id=4129



package com.nfc.activity;

import java.io.IOException;
import android.annotation.SuppressLint;
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})
 */
@SuppressLint("NewApi")
public class ISO15693 {
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
*/
@SuppressLint("NewApi")
public ISO15693(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;
}


}