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int numOfBlock;
final int FIX_SECTOR_COUNT = 16;
boolean success;
final int numOfSector = 16;
final int numOfBlockInSector = 4;
byte[][][] buffer = new
byte[numOfSector][numOfBlockInSector][MifareClassic.BLOCK_SIZE];

ReadMifareClassicTask(MifareClassic tag){
taskTag = tag;
success = false;
}

@Override
protected Void doInBackground(Void... params) {

try {
taskTag.connect();

for(int s=0; s<numOfSector; s++){
if(taskTag.authenticateSectorWithKeyA(s, MifareClassic.KEY_DEFAULT)) {
for(int b=0; b<numOfBlockInSector; b++){
int blockIndex = (s * numOfBlockInSector) + b;
buffer[s][b] = taskTag.readBlock(blockIndex);
}
}
}

success = true;
} catch (IOException e) {
e.printStackTrace();
} finally{
if(taskTag!=null){
try {
taskTag.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

return null;
}

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