code: private void initializeLastNameEditText() {
          lastNameEditText = (EditText) findViewById(R.id.last_name_edit_text);
          lastNameEditText.addValidator(Validators
                  .minLength(this, R.string.min_length_validator_error_message, MIN_NAME_LENGTH));
          lastNameEditText.addValidator(Validators.beginsWithUppercaseLetter(this,
                  R.string.begins_with_uppercase_letter_validator_error_message));
          lastNameEditText.addValidator(Validators
                  .letter(this, R.string.letter_validator_error_message, Case.CASE_INSENSITIVE, false,
                          new char[]{'-'}));
      }
docs: Initializes the edit text, which allows to enter a last name.