Android java get ip address

khannedy / SimpleVersion.java

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WifiManager wm = ( WifiManager ) getSystemService( WIFI_SERVICE );

String ip = Formatter . formatIpAddress(wm . getConnectionInfo() . getIpAddress());

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// AndroidManifest.xml permissions

// test functions

Utils.getMACAddress(«wlan0»);

Utils.getMACAddress(«eth0»);

Utils.getIPAddress(true); // IPv4

Utils.getIPAddress(false); // IPv6

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Android get public ip address programmatically

Hey, In this tutorial we are getting a mobile phone device IP address while the phone is connected to a mobile data connection or WiFi connection. This example demonstrates how do I get the IP address of android device programmatically.

Whenever you enable WiFi on your device and have an active connection to a WiFi network, your mobile data is temporarily disabled, Android Apps/Applications Mobile development this example demonstrates how do I get the IP address of an android device programmatically.

In this example, we will use Network Interface to get the IP address. So, before starting the code we need to know about NetworkInterface.

NetworkInterface

This class represents a Network Interface made up of a name, and a list of IP addresses assigned to this interface. It is used to identify the local interface on which a multicast group is joined. Interfaces are normally known by names such as «le0».

Public methods

Resource : Network Interface

boolean	equals(Object obj) Compares this object against the specified object.
static NetworkInterface	getByIndex(int index) Get a network interface given its index.
static NetworkInterface	getByInetAddress(InetAddress addr) Convenience method to search for a network interface that has the specified Internet Protocol (IP) address bound to it.
static NetworkInterface	getByName(String name) Searches for the network interface with the specified name.
String	getDisplayName() Get the display name of this network interface.
byte[]	getHardwareAddress() Returns the hardware address (usually MAC) of the interface if it has one and if it can be accessed given the current privileges.
int	getIndex() Returns the index of this network interface.
Enumeration	getInetAddresses() Convenience method to return an Enumeration with all or a subset of the InetAddresses bound to this network interface.
List	getInterfaceAddresses() Get a List of all or a subset of the InterfaceAddresses of this network interface.
int	getMTU() Returns the Maximum Transmission Unit (MTU) of this interface.
String	getName() Get the name of this network interface.
static Enumeration	getNetworkInterfaces() Returns all the interfaces on this machine.
NetworkInterface	getParent() Returns the parent NetworkInterface of this interface if this is a subinterface, or null if it is a physical (non-virtual) interface or has no parent.
Enumeration	getSubInterfaces() Get an Enumeration with all the subinterfaces (also known as virtual interfaces) attached to this network interface.
boolean	isLoopback() Returns whether a network interface is a loopback interface.
boolean	isPointToPoint() Returns whether a network interface is a point to point interface.
boolean	isUp() Returns whether a network interface is up and running.
boolean	isVirtual() Returns whether this interface is a virtual interface (also called subinterface).
boolean	supportsMulticast() Returns whether a network interface supports multicasting or not.

Get the IP address of android device programmatically

There are few steps to get an IP address of device.

Step 1

Create a new project in Android Studio, go to File -> New Project and fill all required details to create a new project.

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How to Get the IP Address of Android Device Programmatically

While developing application sometimes you may need the IP address of android device on which an application is installed. So in this tutorial, I am going to show how to get the IP address of an android device and display in TextView programmatically.

We can get the IP address of android device on which an app is installed with different ways and here I am going to show the best and easy method to get the IP address of app installed android device. To get IP address of android device (phone, tablet, tv, wear) using this method I have used WifiManager. So in this way you can get the IP address of any app running android device if there is WiFi network connected.

Android Example: Getting the IP Address of Android Device

Following example will give you the IP address of android device on which an app is installed.

XML Layout File

Following is the content of XML layout file where I have added a TextView to display the IP address of android device.

res/layout/android_device_ip_address.xml

Java Activity File

Following is the little bit java code of activity file.

src/GettingAndroidDeviceIPAddress.java

AndroidManifest.xml File

We are using Wifi Manager to get and display the IP address of android device so, don’t forget to add internet connection and wifi connection permission in your app manifest file.

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mathieugerard / LocalWifiIP.md

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import android.net.wifi.WifiManager ;

import android.content.Context ;

import java.net.InetAddress ;

import java.nio.ByteOrder ;

private String getLocalWifiIpAddress() <

WifiManager wifiManager = ( WifiManager ) context . getSystemService( WIFI_SERVICE );

int ipAddress = wifiManager . getConnectionInfo() . getIpAddress();

if ( ByteOrder . nativeOrder() . equals( ByteOrder . LITTLE_ENDIAN )) <

ipAddress = Integer . reverseBytes(ipAddress);

>

byte [] ipByteArray = BigInteger . valueOf(ipAddress) . toByteArray();

String ipAddressString;

try <

ipAddressString = InetAddress . getByAddress(ipByteArray) . getHostAddress();

> catch ( UnknownHostException ex) <

ipAddressString = null ;

>

return ipAddressString;

>

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# include ifaddrs.h >

# include arpa/inet.h >

— ( NSString *)getLocalWifiIpAddress <

NSString *address = @» error » ;

struct ifaddrs *interfaces = NULL ;

struct ifaddrs *temp_addr = NULL ;

int success = 0 ;

success = getifaddrs (&interfaces);

if (success == 0 ) <

temp_addr = interfaces;

while (temp_addr != NULL ) <

if (temp_addr-> ifa_addr -> sa_family == AF_INET) <

if ([[ NSString stringWithUTF8String: temp_addr->ifa_name] isEqualToString: @» en0 » ]) <

address = [ NSString stringWithUTF8String: inet_ntoa ((( struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

>

>

temp_addr = temp_addr-> ifa_next ;

>

>

// Free memory

freeifaddrs (interfaces);

return address;

>

Get Local Wifi IP address on iOS and Android

This Gist provide the function to retrieve the local IP address of the device when connected to the wifi.

No permission is required from the user to access the information. It uses the getifaddrs method that is not directly part of the public iOS API but it’s still perfectly fine to use it and allowed by Apple.

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Android java get ip address

An IP address is either a 32-bit or 128-bit unsigned number used by IP, a lower-level protocol on which protocols like UDP and TCP are built. The IP address architecture is defined by RFC 790: Assigned Numbers, RFC 1918: Address Allocation for Private Internets, RFC 2365: Administratively Scoped IP Multicast, and RFC 2373: IP Version 6 Addressing Architecture. An instance of an InetAddress consists of an IP address and possibly its corresponding host name (depending on whether it is constructed with a host name or whether it has already done reverse host name resolution).

Address types

unicast

An identifier for a single interface. A packet sent to a unicast address is delivered to the interface identified by that address. The Unspecified Address — Also called anylocal or wildcard address. It must never be assigned to any node. It indicates the absence of an address. One example of its use is as the target of bind, which allows a server to accept a client connection on any interface, in case the server host has multiple interfaces. The unspecified address must not be used as the destination address of an IP packet. The Loopback Addresses — This is the address assigned to the loopback interface. Anything sent to this IP address loops around and becomes IP input on the local host. This address is often used when testing a client.

multicast

An identifier for a set of interfaces (typically belonging to different nodes). A packet sent to a multicast address is delivered to all interfaces identified by that address.

IP address scope

Link-local addresses are designed to be used for addressing on a single link for purposes such as auto-address configuration, neighbor discovery, or when no routers are present.

Site-local addresses are designed to be used for addressing inside of a site without the need for a global prefix.

Global addresses are unique across the internet.

Textual representation of IP addresses

For IPv4 address format, please refer to Inet4Address#format; For IPv6 address format, please refer to Inet6Address#format.

There is a couple of System Properties affecting how IPv4 and IPv6 addresses are used.

Host Name Resolution

Reverse name resolution means that for any IP address, the host associated with the IP address is returned.

The InetAddress class provides methods to resolve host names to their IP addresses and vice versa.

InetAddress Caching

By default, when a security manager is installed, in order to protect against DNS spoofing attacks, the result of positive host name resolutions are cached forever. When a security manager is not installed, the default behavior is to cache entries for a finite (implementation dependent) period of time. The result of unsuccessful host name resolution is cached for a very short period of time (10 seconds) to improve performance.

If the default behavior is not desired, then a Java security property can be set to a different Time-to-live (TTL) value for positive caching. Likewise, a system admin can configure a different negative caching TTL value when needed.

Two Java security properties control the TTL values used for positive and negative host name resolution caching:

networkaddress.cache.ttl Indicates the caching policy for successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the successful lookup. The default setting is to cache for an implementation specific period of time.

A value of -1 indicates «cache forever».

networkaddress.cache.negative.ttl (default: 10) Indicates the caching policy for un-successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the failure for un-successful lookups.

A value of 0 indicates «never cache». A value of -1 indicates «cache forever».

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj)

static InetAddress getByAddress(byte[] addr) static InetAddress getByAddress(String host, byte[] addr) static InetAddress getByName(String host) boolean isReachable(int timeout) boolean isReachable(NetworkInterface netif, int ttl, int timeout)

Methods inherited from class java.lang.Object

Method Detail

isMulticastAddress

isAnyLocalAddress

isLoopbackAddress

isLinkLocalAddress

isSiteLocalAddress

isMCGlobal

isMCNodeLocal

isMCLinkLocal

isMCSiteLocal

isMCOrgLocal

isReachable

The timeout value, in milliseconds, indicates the maximum amount of time the try should take. If the operation times out before getting an answer, the host is deemed unreachable. A negative value will result in an IllegalArgumentException being thrown.

isReachable

The network interface and ttl parameters let the caller specify which network interface the test will go through and the maximum number of hops the packets should go through. A negative value for the ttl will result in an IllegalArgumentException being thrown.

The timeout value, in milliseconds, indicates the maximum amount of time the try should take. If the operation times out before getting an answer, the host is deemed unreachable. A negative value will result in an IllegalArgumentException being thrown.

getHostName

If this InetAddress was created with a host name, this host name will be remembered and returned; otherwise, a reverse name lookup will be performed and the result will be returned based on the system configured name lookup service. If a lookup of the name service is required, call getCanonicalHostName .

If there is a security manager, its checkConnect method is first called with the hostname and -1 as its arguments to see if the operation is allowed. If the operation is not allowed, it will return the textual representation of the IP address.

getCanonicalHostName

If there is a security manager, this method first calls its checkConnect method with the hostname and -1 as its arguments to see if the calling code is allowed to know the hostname for this IP address, i.e., to connect to the host. If the operation is not allowed, it will return the textual representation of the IP address.

getAddress

getHostAddress

hashCode

equals

Two instances of InetAddress represent the same IP address if the length of the byte arrays returned by getAddress is the same for both, and each of the array components is the same for the byte arrays.

toString

getByAddress

The host name can either be a machine name, such as » java.sun.com «, or a textual representation of its IP address.

No validity checking is done on the host name either.

If addr specifies an IPv4 address an instance of Inet4Address will be returned; otherwise, an instance of Inet6Address will be returned.

IPv4 address byte array must be 4 bytes long and IPv6 byte array must be 16 bytes long

getByName

The host name can either be a machine name, such as » java.sun.com «, or a textual representation of its IP address. If a literal IP address is supplied, only the validity of the address format is checked.

For host specified in literal IPv6 address, either the form defined in RFC 2732 or the literal IPv6 address format defined in RFC 2373 is accepted. IPv6 scoped addresses are also supported. See here for a description of IPv6 scoped addresses.

If the host is null then an InetAddress representing an address of the loopback interface is returned. See RFC 3330 section 2 and RFC 2373 section 2.5.3.

getAllByName

The host name can either be a machine name, such as » java.sun.com «, or a textual representation of its IP address. If a literal IP address is supplied, only the validity of the address format is checked.

For host specified in literal IPv6 address, either the form defined in RFC 2732 or the literal IPv6 address format defined in RFC 2373 is accepted. A literal IPv6 address may also be qualified by appending a scoped zone identifier or scope_id. The syntax and usage of scope_ids is described here.

If the host is null then an InetAddress representing an address of the loopback interface is returned. See RFC 3330 section 2 and RFC 2373 section 2.5.3.

If there is a security manager and host is not null and host.length() is not equal to zero, the security manager’s checkConnect method is called with the hostname and -1 as its arguments to see if the operation is allowed.

getLoopbackAddress

The InetAddress returned will represent the IPv4 loopback address, 127.0.0.1, or the IPv6 loopback address, ::1. The IPv4 loopback address returned is only one of many in the form 127.*.*.*

getByAddress

This method doesn’t block, i.e. no reverse name service lookup is performed.

IPv4 address byte array must be 4 bytes long and IPv6 byte array must be 16 bytes long

getLocalHost

Note: The resolved address may be cached for a short period of time.

If there is a security manager, its checkConnect method is called with the local host name and -1 as its arguments to see if the operation is allowed. If the operation is not allowed, an InetAddress representing the loopback address is returned.

• Summary:
• Nested |
• Field |
• Constr |
• Method

• Detail:
• Field |
• Constr |
• Method

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