Android onKeyDown

@Override      public boolean onKeyDown(int keyCode, KeyEvent event) {          switch (keyCode) {          case KeyEvent.KEYCODE_DPAD_DOWN://down key              break;          case KeyEvent.KEYCODE_DPAD_UP:// up key            break;        case KeyEvent.KEYCODE_DPAD_LEFT://left key            break;        case KeyEvent.KEYCODE_DPAD_RIGHT://right key            break;        default:              break;          }                    return super.onKeyDown(keyCode, event);      }