code: private CharSequence getMaxNumberOfCharactersMessage() {
          int maxLength = getMaxNumberOfCharacters();
          int currentLength = getView().length();
          return String
                  .format(getResources().getString(R.string.edit_text_size_violation_error_message),
                          currentLength, maxLength);
      }
docs: Returns the message, which shows how many characters, in relation to the maximum number of
  characters, the edit text is allowed to contain, have already been entered.
  
  @return The message, which shows how many characters, in relation to the maximum number of
  characters, the edit text is allowed to contain, have already been typed, as an instance of
  the type {@link CharSequence}