code: public static boolean showedCustomToast(CharSequence message, int layoutResourceIdToCheckForMessage) {
      ShadowApplication shadowApplication = Shadow.extract(RuntimeEnvironment.application);
      for (Toast toast : shadowApplication.getShownToasts()) {
        String text = ((TextView) toast.getView().findViewById(layoutResourceIdToCheckForMessage)).getText().toString();
        if (text.equals(message.toString())) {
          return true;
        }
      }
      return false;
    }
docs: Returns whether or not a particular custom {@code Toast} has been shown.
  
  @param message the message to search for
  @param layoutResourceIdToCheckForMessage
  the id of the resource that contains the toast messages
  @return whether the {@code Toast} was requested