public static void updateConnectButton() {
      Log.v("ActivityPreferencesCon", "updateConenctionbuttons");

      if (mMenu == null) return;

      MenuItem connectButton = mMenu.findItem(R.id.connect);

      if (connectButton == null) return;

      boolean canConnect = Preferences.canConnect();

      connectButton.setEnabled(canConnect);
      connectButton.getIcon().setAlpha(canConnect ? 255 : 130);
    }