网络状态监听与感知示例

registerNetworkEvent(): void {
  this.netConnection.register((error: BusinessError) => {
    if (error) {
      this.eventOutput = `netConnection register error: ${JSON.stringify(error)}`;
      hilog.error(0x00FF, 'NetworkAwareness', this.eventOutput);
    }
  });

  // 网络可用
  this.netConnection.on('netAvailable', (data: connection.NetHandle) => {
    this.eventOutput = `network available: ${JSON.stringify(data)}`;
    hilog.info(0x00FF, 'NetworkAwareness', this.eventOutput);
    if (this.lastAvailableNetworkId === COMMON_INVALID_VAL) {
      this.lastAvailableNetworkId = data.netId;
    } else if (this.lastAvailableNetworkId === data.netId) {
      // 当前网络和上次连接的可用网络为同一网络
    } else {
      // 当前网络和上次连接的可用网络为不同网络
    }
  });

  // 网络丢失 (例如网络断开)
  this.netConnection.on('netLost', (data: connection.NetHandle) => {
    this.eventOutput = `network lost: ${JSON.stringify(data)}`;
    hilog.info(0x00FF, 'NetworkAwareness', this.eventOutput);
  });

  // 网络不可用 (例如 WIFI 图标上有感叹号)
  this.netConnection.on('netUnavailable', () => {
    this.eventOutput = `network unavailable, id is ${this.lastAvailableNetworkId}`;
    hilog.info(0x00FF, 'NetworkAwareness', this.eventOutput);
  });
}

getNetworkStatus(): void {
  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
      this.statusOutput = `No network connected`;
      hilog.info(0x00FF, 'NetworkAwareness', this.statusOutput);
      return;
    }
    connection.getNetCapabilities(netHandle, (error: BusinessError, netCapabilities: connection.NetCapabilities) => {
      if (error) {
        this.statusOutput = `Failed to get net capabilities. Code:${error.code}, message:${error.message}`;
        hilog.error(0x00FF, 'NetworkAwareness', this.statusOutput);
        return;
      }

      let currentNetInfoTmp =
        `上/下行带宽：${netCapabilities.linkUpBandwidthKbps}/${netCapabilities.linkDownBandwidthKbps} kb/s\n`;

      let netBearType: connection.NetBearType = netCapabilities.bearerTypes[0];
      currentNetInfoTmp += `网络类型：${getNetBearType(netBearType)}\n`;

      let properties: connection.ConnectionProperties = connection.getConnectionPropertiesSync(netHandle);
      currentNetInfoTmp += `网卡名称：${properties.interfaceName}\n`;
      currentNetInfoTmp += `所属域：${properties.domains}\n`;
      currentNetInfoTmp += `最大传输单元：${properties.mtu}\n`;

      this.statusOutput = currentNetInfoTmp;
    });
  }).catch((error: BusinessError) => {
    this.statusOutput = `netHandle get error: ${JSON.stringify(error)}`;
    hilog.error(0x00FF, 'NetworkAwareness', this.statusOutput);
  });
}

entry/src/main/ets/
|---entryability
|---pages
    |---Index.ets                 // 示例展示页面
|---utils
    |---NetworkUtil.ets           // 网络处理类