import * as React from 'react';
import { View } from 'react-native';
import { RadioButton } from 'react-native-paper';

export default class MyComponent extends React.Component {
  state = {
    checked: 'first',
  };

  render() {
    const { checked } = this.state;

    return (
      <View>
        <RadioButton
          value="first"
          checked={checked === 'first'}
          onPress={() => { this.setState({ checked: 'firstOption' }); }}
        />
        <RadioButton
          value="second"
          checked={checked === 'second'}
          onPress={() => { this.setState({ checked: 'secondOption' }); }}
        />
      </View>
    );
  }
}