如何在React-native中创建下拉菜单？

import React, { useState } from 'react';
import { View, Picker, StyleSheet, Text } from 'react-native';

const App = () => {
  const [selectedValue, setSelectedValue] = useState('java');

  return (
    <View style={styles.container}>
      <Text style={styles.text}>Choose a language:</Text>
      <Picker
        selectedValue={selectedValue}
        style={styles.picker}
        onValueChange={(itemValue, itemIndex) => setSelectedValue(itemValue)}
      >
        <Picker.Item label="Java" value="java" />
        <Picker.Item label="JavaScript" value="js" />
        <Picker.Item label="Python" value="python" />
      </Picker>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    paddingHorizontal: 20,
  },
  text: {
    fontSize: 18,
    marginBottom: 10,
  },
  picker: {
    height: 50,
    width: '100%',
  },
});

export default App;

<Picker
  selectedValue={selectedValue}
  style={styles.picker}
  onValueChange={(itemValue, itemIndex) => setSelectedValue(itemValue)}
>
  {/* Picker.Item components */}
</Picker>

<Picker
  selectedValue={selectedValue}
  style={styles.picker}
  onValueChange={(itemValue, itemIndex) => setSelectedValue(itemValue)}
>
  {/* Picker.Item components */}
</Picker>