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当在鸿蒙应用中，网络状态发生变化，我们需要实现监听网络状态的变化，做出相对应的提示，比如退出登录或者退出应用之类的操作。那么我们需要监听当前网络的状态，以下是我封装的代码提供参考：

效果：

参考代码：

import { connection } from '@kit.NetworkKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { CommonConstants } from '../constants/CommonConstants';
import { JumpTool } from '.';
import { DialogContents, H5ShowCommonDialog } from '../../view/H5CommonDialog';
import { WindowUtils } from '../constants/WindowUtils';
import { LoginTool } from './LoginTool';
import Logger from './Logger';
​
export class ListenNetworkState {private static oldNetType: string | null = nullprivate static newNetType: string | null = null
​/***  获取旧网络* @param* @returns*/static async getOldNet() {connection.getDefaultNet().then((netHandle: connection.NetHandle) => {if (netHandle.netId == 0) {// 当前没有已连接的网络时，获取的netHandler的netid为0，属于异常场景，此处可以实际情况自行添加一些处理机制。return;}connection.getNetCapabilities(netHandle, (error: BusinessError, data: connection.NetCapabilities) => {if (error) {return;}// Logger.info("Succeeded to get data: " + JSON.stringify(data));if (data.bearerTypes[0] == 0) {ListenNetworkState.oldNetType = '蜂窝网络'// promptAction.showToast({ message: '蜂窝网络' })}if (data.bearerTypes[0] == 1) {ListenNetworkState.oldNetType = 'Wi-Fi网络'// promptAction.showToast({ message: 'Wi-Fi网络' })}})}).catch((error: BusinessError) => {});}
​/*** 监听网络是否变化* @param* @returns true 变化 false 无变化*/static async listenNetwork() {let isNetworkChanged = false;await ListenNetworkState.getOldNet();let currentNet = connection.createNetConnection();currentNet.register((error) => {if (error) {// Logger.info('订阅失败' + JSON.stringify(error));} else {// Logger.info('订阅成功' + JSON.stringify(error));}});
​//网络切换时currentNet.on("netCapabilitiesChange", (data) => {if (data.netCap.bearerTypes[0] == 0) {ListenNetworkState.newNetType = '蜂窝网络';}if (data.netCap.bearerTypes[0] == 1) {ListenNetworkState.newNetType = 'Wi-Fi网络';}if (ListenNetworkState.oldNetType !== ListenNetworkState.newNetType) {if (CommonConstants.ISLOGIN) {LoginTool.logOut(false, false)
​let context: DialogContents = {title: "提示",message: '网络发生变化，已退出登录',confirms: () => {WindowUtils.getRouter().pushUrl({ url: 'pages/login/LoginPwdPage' })}}H5ShowCommonDialog(context)}ListenNetworkState.oldNetType = ListenNetworkState.newNetType}});
​//无网络切换到有网络时currentNet.on("netAvailable", (data) => {
​if (CommonConstants.ISLOGIN) {LoginTool.logOut(false, false)
​let context: DialogContents = {title: "提示",message: '网络发生变化，已退出登录',confirms: () => {WindowUtils.getRouter().pushUrl({ url: 'pages/login/LoginPwdPage' })}}H5ShowCommonDialog(context)}});}
}