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http://www.cnblogs.com/haoxinyue/archive/2012/05/03/2479599.html
先了解一下MifareClassic协议
在android sdk 的文档中，描述道 “all MifareClassic I/O operations will be supported, andMIFARE_CLASSIC NDEF tags will also be supported. In either case,NfcA will also be enumerated on the tag, because all MIFARE Classic tags are alsoNfcA.” 所以说NFCA协议是兼容MifareClassic 协议的， 我们可以通过NfcA在android的相关类来处理给予MifareClassic 的RFID卡。
一般来说，给予MifareClassic的射频卡，一般内存大小有3种：
1K: 16个分区(sector)，每个分区4个块(block)，每个块(block) 16个byte数据
2K: 32个分区，每个分区4个块(block)，每个块(block) 16个byte数据
4K：64个分区，每个分区4个块(block)，每个块(block) 16个byte数据
对于所有基于MifareClassic的卡来说，每个区最后一个块叫Trailer，16个byte， 主要来存放读写该区的key，可以有A，B两个KEY，每个key长6byte，默认的key一般是FF 或 0，最后一个块的内存结构如下：
//tag 就是在上一篇中onNewIntent中获取的tag
MifareClassic mc = MifareClassic.get(tag); short startAddress = 0; short endAddress = 5; byte[] data = new byte[(endAddress - startAddress + 1 ) * ByteCountPerBlock]; try { mc.connect();for (short i = startAddress; i <= endAddress; i++ ,time++) { boolean auth = false; short sectorAddress = getSectorAddress(i); auth = mc.authenticateSectorWithKeyA(sectorAddress, MifareClassic.KEY_DEFAULT); if (auth){ //the last block of the sector is used for KeyA and KeyB cannot be overwritted short readAddress = (short)(sectorAddress == 0 ? i : i + sectorAddress); byte[] response = mc.readBlock(readAddress); CombineByteArray(data, response, time * ByteCountPerBlock); } else{ throw new NfcException(NfcErrorCode.TemporaryError, "Authorization Error."); } } mc.close(); } catch (NfcException ne) { throw ne; } catch (IOException e) { throw new NfcException(NfcErrorCode.TemporaryError, "Get response, what it is not successfully.", e); } finally { try { mc.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //tag 就是在上一篇中onNewIntent中获取的tagMifareClassic mc = MifareClassic.get(tag); try { mc.connect(); boolean auth = false; short sectorAddress = 0 auth = mc.authenticateSectorWithKeyA(sectorAddress, MifareClassic.KEY_DEFAULT); if (auth) { //the last block of the sector is used for KeyA and KeyB cannot be overwritted mc.writeBlock(readAddress, dataTemp); mc.close(); } }finally { try { mc.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 完整的代码示例在下载
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