如何在Android中编程设置DNS1和DNS2 &如何检查DNS是否设置？

if (wifiInfo != null) {
    List<InetAddress> dnsServers = wifiConfig.linkProperties.getDnsServers();
    if (dnsServers != null && !dnsServers.isEmpty()) {
        for (InetAddress dnsServer : dnsServers) {
            String dnsServerAddress = dnsServer.getHostAddress();
            // 进行DNS设置检查
            // ...
        }
    } else {
        // DNS未设置
    }
}