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   源码介绍

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package com.example.mynfcdemon;

import java.io.IOException;

import android.nfc.tech.NfcV;

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;


/*@function		:初始化
@param 			 ：mNfcV NfcV对象
@return 		:返回内容byte[]
@author：		:Demon 503536038@qq.com
*/
 
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();
	
	System.out.println("UID:"   getUID()
			 "AFI:"   getAFI()
			 "DSFID:"   getDSFID()
			 "BlockNumber:"   getBlockNumber()
			 "BlockSize:"   getOneBlockSize());
}

public String getUID() {
	return UID;
}

/*@function		:取得标签信息
@return 		:返回内容byte[]
@author：		:Demon 503536038@qq.com
*/
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;
}

/*@function		: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
@author：		:Demon 503536038@qq.com
*/
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);
	
	for(int i=0; i < res.length; i  ){
		
		System.out.println("/"   res[i]);
	}
	String r = new String(res);
	System.out.println("/"   r);
	
	if(res[0] == 0x00){
		byte block[] = new byte[res.length - 1];
		System.arraycopy(res, 1, block, 0, res.length - 1);
		
		//return printHexString(block);
		
		String blockstr = new String(block);
		return blockstr;
	}
	return null;
}

/*@function		:读取从begin开始end个block
  @instructions	: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
  @author：		:Demon 503536038@qq.com
 */
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) position;
	//value
	System.arraycopy(data, 0, cmd, 11, data.length);
	byte[]rsp = mNfcV.transceive(cmd);
	if(rsp[0] == 0x00){
		return true;
	}
		
	return false;
}

public boolean writeStrToTag(String str){
	
	
	return false;
	
}


}