@Override
 public boolean onOptionsItemSelected(MenuItem item) {
   switch (item.getItemId()) {
     case R.id.next_Icon:
       if (connectionFragment.sockets.size() != 0) {
         connectionFragment.PasarALosGraficos();
         item.setVisible(false);
       } else {
         Toast.makeText(this, getString(R.string.no_sensors), Toast.LENGTH_SHORT).show();
       }
       break;
   }
   return super.onOptionsItemSelected(item);
 }