查询网络连接状态，api12

import { connection } from '@kit.NetworkKit';

export enum NetType {
  CELLULAR = 0, //蜂窝网络
  WIFI = 1, //WIFI
  ETHERNET = 2, //以太网网络
  VPN = 3, //VPN
  None = 4 //不可用
}

export class NetAddress {
  address: string = "";
  port?: number = 0;
  ipv4: boolean = true;
  ipv6: boolean = false;
}

export class NetCapbbilities {

  /*
   * 网络发生改变
   * */
  public static netStatusDidCahnge(callback: (status: NetType) => void) {
    let con = connection.createNetConnection();
    con.register(() => {
    });
    con.on("netLost",(info: connection.NetHandle) => {
      callback(NetType.None);
    })
    con.on("netAvailable",(info) => {
      let status = NetCapbbilities.currentNetType();
      callback(status);
    });
  }

  /*
   * 连接网络类型
   * */
  public static currentNetType(): NetType {

    let has = connection.hasDefaultNetSync();
    if (has) {
      let h = connection.getDefaultNetSync();
      let c = connection.getNetCapabilitiesSync(h);
      let bearerTypes: connection.NetBearType = c.bearerTypes[0];
      switch (bearerTypes) {
        case connection.NetBearType.BEARER_CELLULAR:
          return NetType.CELLULAR;
        case connection.NetBearType.BEARER_WIFI:
          return NetType.WIFI;
        case connection.NetBearType.BEARER_ETHERNET:
          return NetType.ETHERNET;
        case connection.NetBearType.BEARER_VPN:
          return NetType.VPN;
      }
    }
    return NetType.None;
  }

  /*
   * 获取ip地址
   * */
  public static getIp(): NetAddress {
    if (NetCapbbilities.currentNetType() == NetType.None) {
      return new NetAddress();
    }
    let h = connection.getDefaultNetSync();
    let p = connection.getConnectionPropertiesSync(h);
    let address = p.linkAddresses[0];
    let res = new NetAddress();
    res.address = address.address.address;
    res.port = address.address.port;
    res.ipv4 = address.address.family == 1;
    res.ipv6 = address.address.family == 2;
    return res;
  }

}