Android 获取网关 ip 和 DNS ip

参考下方 PingUtil.java 代码

import android.content.Context;
import android.net.DhcpInfo;
import android.net.wifi.WifiManager;
import android.text.format.Formatter;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.net.InetAddress;
import java.util.LinkedList;public class PingUtil {/*** 获取网关(API>=29)*/public static String getGateway(Context context) {WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);DhcpInfo dhcpInfo = wifiManager.getDhcpInfo();int gateway = dhcpInfo.gateway;return Formatter.formatIpAddress(gateway);}/*** 获取dns*/public static String getDns() {String[] dnsServers = getDnsFromCommand();// 组装StringBuffer sb = new StringBuffer();if (dnsServers != null) {sb.append(dnsServers[0]);  //注意这里只会返回1个dns服务器ip}return sb.toString();}//通过 getprop 命令获取private static String[] getDnsFromCommand() {LinkedList<String> dnsServers = new LinkedList<>();try {Process process = Runtime.getRuntime().exec("getprop");InputStream inputStream = process.getInputStream();LineNumberReader lnr = new LineNumberReader(new InputStreamReader(inputStream));String line = null;while ((line = lnr.readLine()) != null) {int split = line.indexOf("]: [");if (split == -1) continue;String property = line.substring(1, split);String value = line.substring(split + 4, line.length() - 1);if (property.endsWith(".dns")|| property.endsWith(".dns1")|| property.endsWith(".dns2")|| property.endsWith(".dns3")|| property.endsWith(".dns4")) {InetAddress ip = InetAddress.getByName(value);if (ip == null) continue;value = ip.getHostAddress();if (value == null) continue;if (value.length() == 0) continue;dnsServers.add(value);}}} catch (Exception e) {e.printStackTrace();}return dnsServers.isEmpty() ? new String[0] : dnsServers.toArray(new String[dnsServers.size()]);}}