The Giacobbe candidates

Recently I have developed an app with the purpose to read data from an USB card reader. The data to be read are stored on a plastic card organized in this way:  a start tag; a fixed field (length of 17 char); two other fields separated by a white space with no size declarad but always present; an end tag.  The external USB card reader is something similar to an external keyboard so it's possible to override the appropriate method in the  Activity to handle every single character read from the reader. The Activity manages the card data character by character so  firstly I had to create a UsbDecoder class to manage the data flow and to build my output values. Lastly. I had to implemented the onKeyDown to intercept the data from the reader: @Override public boolean onKeyDown(int keyCode, KeyEvent event) { char pressedKey; if (event.getKeyCode() == KeyEvent.KEYCODE_SPACE || event.getKeyCode() == KeyEvent.KEYCODE_TAB) { pressedKey = Character