我在react native + redux中有一个注册页面，我想在电子邮件地址字段中包括@gmail.com

import React, { useState } from 'react';
import { View, TextInput, Button } from 'react-native';
import { useDispatch } from 'react-redux';
import { setEmail } from '../redux/actions'; // 假设这是设置电子邮件的Redux操作

const RegisterPage = () => {
  const dispatch = useDispatch();
  const [email, setEmail] = useState('');

  const handleRegister = () => {
    // 处理注册逻辑
    // 可以在此处调用Redux操作设置电子邮件
    dispatch(setEmail(email));
  }

  return (
    <View>
      <TextInput
        value={email}
        onChangeText={setEmail}
        placeholder="电子邮件地址"
      />
      <Button onPress={handleRegister} title="注册" />
    </View>
  );
}

export default RegisterPage;