title: How Can i read mifare classic 1k Card by Nexus s
body: <p>am working with NFC Android programming and I want to read Mifare Classic cards. Does anybody know how to read the sectors off such a card?</p>
  
  <p>Authentication method returns true which means that authentication is done. After authentication, sector should be ready for any IO action but whenever i use readBlock() method or transceive() method, I get exception with IOException("transceive failed"). I can not find any example which uses the Mifare Classic, so i want to know if it is possible to read the Mifare Classic with this API or not.</p>
  
  <p>My code like this <code>boolean success = m1tag.authenticateSectorWithKeyB(0,MifareClassic。KEY_DEFAULT）
  int index = m1tag.sectorToBlock(0)
  byte[] content = m1tag.readBlock(index)</code></p>
  
  <p>success is true,but when i read content from card,throw IOException("transceive failed")</p>