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@Override
protected String doInBackground(String[] arg0) {

try{
Log.d(" 여긴가", "owner_10.8_try 들어옴");
String link = "http://192.168.0.85/del_all_table2_3_4.php";

URL url = new URL(link);

HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
BufferedReader in = newBufferedReader(newInputStreamReader(urlConnection.getInputStream()));

StringBuffer sb = new StringBuffer("");
String line="";

while ((line = in.readLine()) != null) {
sb.append(line);
Log.d(sb.toString(),"created result");
break;
}

in.close();
Log.d(" 여긴가", "9.7_del_all_table3, 완료");

Intent intent = new Intent(getApplicationContext(),MainActivity.class);
Log.d(" 여긴가", "9.888_ 처음화면으로 돌아감");
startActivity(intent);

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.

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