获取wifi的ip，子网掩码，网关，dns之类的信息

public class MainActivity extends Activity {

private WifiManager my_wifiManager;
private WifiInfo wifiInfo;
private DhcpInfo dhcpInfo;

private TextView tvResult;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

my_wifiManager = ((WifiManager) getSystemService("wifi"));
dhcpInfo = my_wifiManager.getDhcpInfo();
wifiInfo = my_wifiManager.getConnectionInfo();

tvResult = (TextView) findViewById(R.id.tvResult);
}

@Override
protected void onResume() {
super.onResume();
StringBuilder sb = new StringBuilder();
sb.append("网络信息：");
sb.append("\nipAddress：" + intToIp(dhcpInfo.ipAddress));
sb.append("\nnetmask：" + intToIp(dhcpInfo.netmask));
sb.append("\ngateway：" + intToIp(dhcpInfo.gateway));
sb.append("\nserverAddress：" + intToIp(dhcpInfo.serverAddress));
sb.append("\ndns1：" + intToIp(dhcpInfo.dns1));
sb.append("\ndns2：" + intToIp(dhcpInfo.dns2));
sb.append("\n");
System.out.println(intToIp(dhcpInfo.ipAddress));
System.out.println(intToIp(dhcpInfo.netmask));
System.out.println(intToIp(dhcpInfo.gateway));
System.out.println(intToIp(dhcpInfo.serverAddress));
System.out.println(intToIp(dhcpInfo.dns1));
System.out.println(intToIp(dhcpInfo.dns2));
System.out.println(dhcpInfo.leaseDuration);

sb.append("Wifi信息：");
sb.append("\nIpAddress：" + intToIp(wifiInfo.getIpAddress()));
sb.append("\nMacAddress：" + wifiInfo.getMacAddress());
tvResult.setText(sb.toString());
}

private String intToIp(int paramInt) {
return (paramInt & 0xFF) + "." + (0xFF & paramInt >> 8) + "." + (0xFF & paramInt >> 16) + "."
+ (0xFF & paramInt >> 24);
}
}

/**
* Convert a IPv4 address from an integer to an InetAddress.
* @param hostAddress an int corresponding to the IPv4 address in network byte order
*/
public static InetAddress intToInetAddress(int hostAddress) {
byte[] addressBytes = { (byte)(0xff & hostAddress),
(byte)(0xff & (hostAddress >> 8)),
(byte)(0xff & (hostAddress >> 16)),
(byte)(0xff & (hostAddress >> 24)) };

try {
return InetAddress.getByAddress(addressBytes);
} catch (UnknownHostException e) {
throw new AssertionError();
}
}

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