code: def press_keycode(self, keycode, metastate=None):
          
          driver = self._current_application()
          driver.press_keycode(keycode, metastate)
docs: Sends a press of keycode to the device.
  
          Android only.
  
          Possible keycodes & meta states can be found in
          http://developer.android.com/reference/android/view/KeyEvent.html
  
          Meta state describe the pressed state of key modifiers such as
          Shift, Ctrl & Alt keys. The Meta State is an integer in which each
          bit set to 1 represents a pressed meta key.
  
          For example
          - META_SHIFT_ON = 1
          - META_ALT_ON = 2
  
          | metastate=1 --> Shift is pressed
          | metastate=2 --> Alt is pressed
          | metastate=3 --> Shift+Alt is pressed
  
           - _keycode- - the keycode to be sent to the device
           - _metastate- - status of the meta keys