How to use the react-native-device-info.getUserAgent function in react-native-device-info

console.log("Device Name", DeviceInfo.getSystemName());  // e.g. iPhone OS

        console.log("Device Version", DeviceInfo.getSystemVersion());  // e.g. 9.0

        console.log("Bundle Id", DeviceInfo.getBundleId());  // e.g. com.learnium.mobile

        console.log("Build Number", DeviceInfo.getBuildNumber());  // e.g. 89

        console.log("App Version", DeviceInfo.getVersion());  // e.g. 1.1.0

        console.log("App Version (Readable)", DeviceInfo.getReadableVersion());  // e.g. 1.1.0.89

        console.log("Device Name", DeviceInfo.getDeviceName());  // e.g. Becca's iPhone 6

        console.log("User Agent", DeviceInfo.getUserAgent()); // e.g. Dalvik/2.1.0 (Linux; U; Android 5.1; Google Nexus 4 - 5.1.0 - API 22 - 768x1280 Build/LMY47D)


        const {navigator} = this.props;
        storge.load({
            key:'AppVersion',
            autoSync:true,
        }).then(ret =>{
            version = ret.AppVersion;
            console.log(JSON.stringify(version))
        }).catch(err => {
            // 如果没有找到数据且没有同步方法，
            // 或者有其他异常，则在catch中返回
            console.warn(err);
        })

        this.timer = setTimeout(()=> {

// An All Components Screen is a great way to dev and quick-test components
import React from 'react'
import { View, ScrollView, Text, Image, NetInfo, TouchableOpacity } from 'react-native'
import DeviceInfo from 'react-native-device-info'
import { Metrics, Images } from './DevTheme'
import styles from './Styles/DeviceInfoScreenStyles'

const HARDWARE_DATA = [
  {title: 'Device Manufacturer', info: DeviceInfo.getManufacturer()},
  {title: 'Device Name', info: DeviceInfo.getDeviceName()},
  {title: 'Device Model', info: DeviceInfo.getModel()},
  {title: 'Device Unique ID', info: DeviceInfo.getUniqueID()},
  {title: 'Device Locale', info: DeviceInfo.getDeviceLocale()},
  {title: 'Device Country', info: DeviceInfo.getDeviceCountry()},
  {title: 'User Agent', info: DeviceInfo.getUserAgent()},
  {title: 'Screen Width', info: Metrics.screenWidth},
  {title: 'Screen Height', info: Metrics.screenHeight}
]

const OS_DATA = [
  {title: 'Device System Name', info: DeviceInfo.getSystemName()},
  {title: 'Device ID', info: DeviceInfo.getDeviceId()},
  {title: 'Device Version', info: DeviceInfo.getSystemVersion()}
]

const APP_DATA = [
  {title: 'Bundle Id', info: DeviceInfo.getBundleId()},
  {title: 'Build Number', info: DeviceInfo.getBuildNumber()},
  {title: 'App Version', info: DeviceInfo.getVersion()},
  {title: 'App Version (Readable)', info: DeviceInfo.getReadableVersion()}
]

// An All Components Screen is a great way to dev and quick-test components
import React from 'react'
import { View, ScrollView, Text, Image, NetInfo, TouchableOpacity } from 'react-native'
import DeviceInfo from 'react-native-device-info'
import Reactotron from 'reactotron-react-native'
import { Metrics, Images } from './DevTheme'
import styles from './Styles/DeviceInfoScreenStyles'

const HARDWARE_DATA = [
  {title: 'Device Manufacturer', info: DeviceInfo.getManufacturer()},
  {title: 'Device Name', info: DeviceInfo.getDeviceName()},
  {title: 'Device Model', info: DeviceInfo.getModel()},
  {title: 'Device Unique ID', info: DeviceInfo.getUniqueID()},
  {title: 'Device Locale', info: DeviceInfo.getDeviceLocale()},
  {title: 'Device Country', info: DeviceInfo.getDeviceCountry()},
  {title: 'User Agent', info: DeviceInfo.getUserAgent()},
  {title: 'Screen Width', info: Metrics.screenWidth},
  {title: 'Screen Height', info: Metrics.screenHeight}
]

const OS_DATA = [
  {title: 'Device System Name', info: DeviceInfo.getSystemName()},
  {title: 'Device ID', info: DeviceInfo.getDeviceId()},
  {title: 'Device Version', info: DeviceInfo.getSystemVersion()}
]

const APP_DATA = [
  {title: 'Bundle Id', info: DeviceInfo.getBundleId()},
  {title: 'Build Number', info: DeviceInfo.getBuildNumber()},
  {title: 'App Version', info: DeviceInfo.getVersion()},
  {title: 'App Version (Readable)', info: DeviceInfo.getReadableVersion()}
]

export const LOGw = new Logger(LOG_LEVEL.warning);
export const LOGe = new Logger(LOG_LEVEL.error  );


LOG.info("Device Manufacturer",    DeviceInfo.getManufacturer());  // e.g. Apple
LOG.info("Device Brand",           DeviceInfo.getBrand());  // e.g. Apple / htc / Xiaomi
LOG.info("Device Model",           DeviceInfo.getModel());  // e.g. iPhone 6
LOG.info("Device ID",              DeviceInfo.getDeviceId());  // e.g. iPhone7,2 / or the board on Android e.g. goldfish
LOG.info("System Name",            DeviceInfo.getSystemName());  // e.g. iPhone OS
LOG.info("System Version",         DeviceInfo.getSystemVersion());  // e.g. 9.0
LOG.info("Bundle ID",              DeviceInfo.getBundleId());  // e.g. com.learnium.mobile
LOG.info("Build Number",           DeviceInfo.getBuildNumber());  // e.g. 89
LOG.info("App Version",            DeviceInfo.getVersion());  // e.g. 1.1.0
LOG.info("App Version (Readable)", DeviceInfo.getReadableVersion());  // e.g. 1.1.0.89
LOG.info("Device Name",            DeviceInfo.getDeviceName());  // e.g. Becca's iPhone 6
LOG.info("User Agent",             DeviceInfo.getUserAgent()); // e.g. Dalvik/2.1.0 (Linux; U; Android 5.1; Google Nexus 4 - 5.1.0 - API 22 - 768x1280 Build/LMY47D)
LOG.info("Device Locale",          DeviceInfo.getDeviceLocale()); // e.g en-US
LOG.info("Device Country",         DeviceInfo.getDeviceCountry()); // e.g US
LOG.info("App Instance ID",        DeviceInfo.getInstanceID()); // ANDROID ONLY - see https://developers.google.com/instance-id/

initialize(trackerId,appName){
    this.uniqueClientId = uniqClientId;
    this.trackingAppName = appName;
    this.currentRootScreen = ''; 
    this.ga = new Analytics(trackerId, uniqClientId, 1, DeviceInfo.getUserAgent());
    this.processPrematureHitsQueue();
    const deviceName =  DeviceInfo.getModel().toLocaleLowerCase() !== 'iphone' 
      ? DeviceInfo.getModel() : DeviceInfo.getDeviceId();
    console.log('analytics detected deviceName:',deviceName, 'uid:', uniqClientId);
    this.addSessionDimension(4, deviceName);
  },
  addSessionDimension(index,value){

formData.append('element_1', feedback.comment)
		formData.append('element_2', feedback.name)
		formData.append('element_3', feedback.email)
		formData.append(
			'element_4',
			'Device Manufacturer: ' + Device.getManufacturer() + '\n' +
			'Device Brand: ' + Device.getBrand() + '\n' +
			'Device Model: ' + Device.getModel() + '\n' +
			'Device ID: ' + Device.getDeviceId() + '\n' +
			'System Name: ' + Device.getSystemName() + '\n' +
			'System Version: ' + Device.getSystemVersion() + '\n' +
			'Bundle ID: ' + Device.getBundleId() + '\n' +
			'App Version: ' + Device.getVersion() + '\n' +
			'Build Number: ' + Device.getBuildNumber() + '\n' +
			'Device Name: ' + Device.getDeviceName() + '\n' +
			'User Agent: ' + Device.getUserAgent() + '\n' +
			'Device Locale: ' + Device.getDeviceLocale() + '\n' +
			'Device Country: ' + Device.getDeviceCountry() + '\n' +
			'Timezone: ' + Device.getTimezone()
		)
		formData.append('form_id','175631')
		formData.append('submit_form','1')
		formData.append('page_number','1')
		formData.append('submit_form','Submit')

		return fetch(FEEDBACK_URL, {
			method: 'POST',
			body: formData
		})
			.then(response => (response))
			.catch(error => (error))
	}

componentDidMount() {
        Client4.setUserAgent(DeviceInfo.getUserAgent());

        if (store.getState().views.root.hydrationComplete) {
            this.handleHydrationComplete();
        } else {
            this.unsubscribeFromStore = store.subscribe(this.listenForHydration);
        }
    }

render() {
    return (
      
    );
  }
}