fun getIPAddress(): String? {
    try {
        val interfaces: List<NetworkInterface> = NetworkInterface.getNetworkInterfaces().toList()
        for (networkInterface in interfaces) {
            val addresses: List<InetAddress> = networkInterface.inetAddresses.toList()
            for (address in addresses) {
                if (!address.isLoopbackAddress && !address.isLinkLocalAddress && address.isSiteLocalAddress) {
                    return address.hostAddress
                }
            }
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }
    return null
}

它会过滤掉环回、链路本地和非站点本地地址，以查找设备的IP地址。该函数返回字符串形式的IP地址，如果检索IP地址失败，则返回null。