是否可以使用一些代码获得设备的IP地址?
当前回答
在AndroidManifest.xml中声明ACCESS_WIFI_STATE权限:
<uses-permission
android:name="android.permission.ACCESS_WIFI_STATE"/>
可以通过WifiManager获取IP地址:
Context context = requireContext().getApplicationContext();
WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
String ip = Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());
其他回答
根据我的测试,这是我的建议
import java.net.*;
import java.util.*;
public class hostUtil
{
public static String HOST_NAME = null;
public static String HOST_IPADDRESS = null;
public static String getThisHostName ()
{
if (HOST_NAME == null) obtainHostInfo ();
return HOST_NAME;
}
public static String getThisIpAddress ()
{
if (HOST_IPADDRESS == null) obtainHostInfo ();
return HOST_IPADDRESS;
}
protected static void obtainHostInfo ()
{
HOST_IPADDRESS = "127.0.0.1";
HOST_NAME = "localhost";
try
{
InetAddress primera = InetAddress.getLocalHost();
String hostname = InetAddress.getLocalHost().getHostName ();
if (!primera.isLoopbackAddress () &&
!hostname.equalsIgnoreCase ("localhost") &&
primera.getHostAddress ().indexOf (':') == -1)
{
// Got it without delay!!
HOST_IPADDRESS = primera.getHostAddress ();
HOST_NAME = hostname;
//System.out.println ("First try! " + HOST_NAME + " IP " + HOST_IPADDRESS);
return;
}
for (Enumeration<NetworkInterface> netArr = NetworkInterface.getNetworkInterfaces(); netArr.hasMoreElements();)
{
NetworkInterface netInte = netArr.nextElement ();
for (Enumeration<InetAddress> addArr = netInte.getInetAddresses (); addArr.hasMoreElements ();)
{
InetAddress laAdd = addArr.nextElement ();
String ipstring = laAdd.getHostAddress ();
String hostName = laAdd.getHostName ();
if (laAdd.isLoopbackAddress()) continue;
if (hostName.equalsIgnoreCase ("localhost")) continue;
if (ipstring.indexOf (':') >= 0) continue;
HOST_IPADDRESS = ipstring;
HOST_NAME = hostName;
break;
}
}
} catch (Exception ex) {}
}
}
这是我的助手util读取IP和MAC地址。实现是纯java,但我在getMACAddress()中有一个注释块,可以从特殊的Linux(Android)文件读取值。我只在少数设备和模拟器上运行了这段代码,但如果你发现奇怪的结果,请告诉我。
// AndroidManifest.xml permissions
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
// test functions
Utils.getMACAddress("wlan0");
Utils.getMACAddress("eth0");
Utils.getIPAddress(true); // IPv4
Utils.getIPAddress(false); // IPv6
Utils.java
import java.io.*;
import java.net.*;
import java.util.*;
//import org.apache.http.conn.util.InetAddressUtils;
public class Utils {
/**
* Convert byte array to hex string
* @param bytes toConvert
* @return hexValue
*/
public static String bytesToHex(byte[] bytes) {
StringBuilder sbuf = new StringBuilder();
for(int idx=0; idx < bytes.length; idx++) {
int intVal = bytes[idx] & 0xff;
if (intVal < 0x10) sbuf.append("0");
sbuf.append(Integer.toHexString(intVal).toUpperCase());
}
return sbuf.toString();
}
/**
* Get utf8 byte array.
* @param str which to be converted
* @return array of NULL if error was found
*/
public static byte[] getUTF8Bytes(String str) {
try { return str.getBytes("UTF-8"); } catch (Exception ex) { return null; }
}
/**
* Load UTF8withBOM or any ansi text file.
* @param filename which to be converted to string
* @return String value of File
* @throws java.io.IOException if error occurs
*/
public static String loadFileAsString(String filename) throws java.io.IOException {
final int BUFLEN=1024;
BufferedInputStream is = new BufferedInputStream(new FileInputStream(filename), BUFLEN);
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream(BUFLEN);
byte[] bytes = new byte[BUFLEN];
boolean isUTF8=false;
int read,count=0;
while((read=is.read(bytes)) != -1) {
if (count==0 && bytes[0]==(byte)0xEF && bytes[1]==(byte)0xBB && bytes[2]==(byte)0xBF ) {
isUTF8=true;
baos.write(bytes, 3, read-3); // drop UTF8 bom marker
} else {
baos.write(bytes, 0, read);
}
count+=read;
}
return isUTF8 ? new String(baos.toByteArray(), "UTF-8") : new String(baos.toByteArray());
} finally {
try{ is.close(); } catch(Exception ignored){}
}
}
/**
* Returns MAC address of the given interface name.
* @param interfaceName eth0, wlan0 or NULL=use first interface
* @return mac address or empty string
*/
public static String getMACAddress(String interfaceName) {
try {
List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface intf : interfaces) {
if (interfaceName != null) {
if (!intf.getName().equalsIgnoreCase(interfaceName)) continue;
}
byte[] mac = intf.getHardwareAddress();
if (mac==null) return "";
StringBuilder buf = new StringBuilder();
for (byte aMac : mac) buf.append(String.format("%02X:",aMac));
if (buf.length()>0) buf.deleteCharAt(buf.length()-1);
return buf.toString();
}
} catch (Exception ignored) { } // for now eat exceptions
return "";
/*try {
// this is so Linux hack
return loadFileAsString("/sys/class/net/" +interfaceName + "/address").toUpperCase().trim();
} catch (IOException ex) {
return null;
}*/
}
/**
* Get IP address from first non-localhost interface
* @param useIPv4 true=return ipv4, false=return ipv6
* @return address or empty string
*/
public static String getIPAddress(boolean useIPv4) {
try {
List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface intf : interfaces) {
List<InetAddress> addrs = Collections.list(intf.getInetAddresses());
for (InetAddress addr : addrs) {
if (!addr.isLoopbackAddress()) {
String sAddr = addr.getHostAddress();
//boolean isIPv4 = InetAddressUtils.isIPv4Address(sAddr);
boolean isIPv4 = sAddr.indexOf(':')<0;
if (useIPv4) {
if (isIPv4)
return sAddr;
} else {
if (!isIPv4) {
int delim = sAddr.indexOf('%'); // drop ip6 zone suffix
return delim<0 ? sAddr.toUpperCase() : sAddr.substring(0, delim).toUpperCase();
}
}
}
}
}
} catch (Exception ignored) { } // for now eat exceptions
return "";
}
}
免责声明:这个Utils类的想法和示例代码来自 几个SO帖子和谷歌。我已经清理和合并了所有的例子。
编译一些想法,以更好的kotlin解决方案从WifiManager获得wifi ip:
private fun getWifiIp(context: Context): String? {
return context.getSystemService<WifiManager>().let {
when {
it == null -> "No wifi available"
!it.isWifiEnabled -> "Wifi is disabled"
it.connectionInfo == null -> "Wifi not connected"
else -> {
val ip = it.connectionInfo.ipAddress
((ip and 0xFF).toString() + "." + (ip shr 8 and 0xFF) + "." + (ip shr 16 and 0xFF) + "." + (ip shr 24 and 0xFF))
}
}
}
}
或者,您可以通过NetworkInterface获取ip4环回设备的ip地址:
fun getNetworkIp4LoopbackIps(): Map<String, String> = try {
NetworkInterface.getNetworkInterfaces()
.asSequence()
.associate { it.displayName to it.ip4LoopbackIps() }
.filterValues { it.isNotEmpty() }
} catch (ex: Exception) {
emptyMap()
}
private fun NetworkInterface.ip4LoopbackIps() =
inetAddresses.asSequence()
.filter { !it.isLoopbackAddress && it is Inet4Address }
.map { it.hostAddress }
.filter { it.isNotEmpty() }
.joinToString()
虽然有一个正确的答案,我在这里分享我的答案,希望这样会更方便。
WifiManager wifiMan = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInf = wifiMan.getConnectionInfo();
int ipAddress = wifiInf.getIpAddress();
String ip = String.format("%d.%d.%d.%d", (ipAddress & 0xff),(ipAddress >> 8 & 0xff),(ipAddress >> 16 & 0xff),(ipAddress >> 24 & 0xff));
你可以使用LinkProperties。建议用于新的Android版本。
此功能检索WiFi和移动数据的本地IP地址。它需要Manifest.permission。ACCESS_NETWORK_STATE许可。
@Nullable
public static String getDeviceIpAddress(@NonNull ConnectivityManager connectivityManager) {
LinkProperties linkProperties = connectivityManager.getLinkProperties(connectivityManager.getActiveNetwork());
InetAddress inetAddress;
for(LinkAddress linkAddress : linkProperties.getLinkAddresses()) {
inetAddress = linkAddress.getAddress();
if (inetAddress instanceof Inet4Address
&& !inetAddress.isLoopbackAddress()
&& inetAddress.isSiteLocalAddress()) {
return inetAddress.getHostAddress();
}
}
return null;
}
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