从React本机选取器selectedvalue获取参数

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

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

  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Select a language:</Text>
      <Picker
        selectedValue={selectedValue}
        onValueChange={(itemValue, itemIndex) => setSelectedValue(itemValue)}
      >
        <Picker.Item label="Java" value="java" />
        <Picker.Item label="JavaScript" value="js" />
        <Picker.Item label="Python" value="python" />
      </Picker>
      <Text>Selected Language: {selectedValue}</Text>
    </View>
  );
};

export default App;

<Picker
  selectedValue={selectedValue}
  onValueChange={(itemValue, itemIndex) => setSelectedValue(itemValue)}
>
  {/* Picker.Item 组件 */}
</Picker>

<Text>Selected Language: {selectedValue}</Text>