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return sb.toString();
} catch(Exception e){
Log.d(" 여긴가", "9.8_del_all_table3, 완료못함");
return new String("Exception: " + e.getMessage());
}
}

}

private class ReadMifareClassicTask extends AsyncTask<Void, Void, Void> {

/*
MIFARE Classic tags are divided into sectors, and each sector is sub-divided into blocks.
Block size is always 16 bytes (BLOCK_SIZE). Sector size varies.
MIFARE Classic 1k are 1024 bytes (SIZE_1K), with 16 sectors each of 4 blocks.
*/

MifareClassic taskTag;
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);
}
}
}

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