how to get the IP of the wifi hotspot in Android?

Question

As the title says... I\'m trying to be able to get the IP of the wifi iface when it is configured as hotspot. Ideally, I would like to find something that works for all the phon

Answer 1

private static byte[] convert2Bytes(int hostAddress) {
    byte[] addressBytes = { (byte)(0xff & hostAddress),
            (byte)(0xff & (hostAddress >> 8)),
            (byte)(0xff & (hostAddress >> 16)),
            (byte)(0xff & (hostAddress >> 24)) };
    return addressBytes;
}

public static String getApIpAddr(Context context) {
    WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    DhcpInfo dhcpInfo = wifiManager.getDhcpInfo();
    byte[] ipAddress = convert2Bytes(dhcpInfo.serverAddress);
    try {
        String apIpAddr = InetAddress.getByAddress(ipAddress).getHostAddress();
        return apIpAddr;
    } catch (UnknownHostException e) {
        e.printStackTrace();
    }
    return null;
}

Answer 2

I use the solution of ajma, changing intf.getName().contains("wlan") to intf.getName().contains("wl") || intf.getName().contains("ap"). And it works for many mobile phones.

But it returns null when you just connected to a WiFi.

Answer 3

Here's what I did to get the wifi hotspot ip:

public String getWifiApIpAddress() {
    try {
        for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en
                .hasMoreElements();) {
            NetworkInterface intf = en.nextElement();
            if (intf.getName().contains("wlan")) {
                for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr
                        .hasMoreElements();) {
                    InetAddress inetAddress = enumIpAddr.nextElement();
                    if (!inetAddress.isLoopbackAddress()
                            && (inetAddress.getAddress().length == 4)) {
                        Log.d(TAG, inetAddress.getHostAddress());
                        return inetAddress.getHostAddress();
                    }
                }
            }
        }
    } catch (SocketException ex) {
        Log.e(TAG, ex.toString());
    }
    return null;
}

This will give you the IP address of any wifi device, which means it's not just for the hotspot. If you're connected to another wifi network (meaning you're not in hotspot mode), it'll return an IP.

You should check if you are in AP mode first or not. You can use this class for that: http://www.whitebyte.info/android/android-wifi-hotspot-manager-class

Answer 4

Here is a possible solution that utilizes WiFiManager ConnectionInfo to find corresponding NetworkInterface.

If you just need the IP then you can use:

WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();

Answer 5

When the Wifi is not setup as a hotspot, it has a name android-xx7632x324x32423 home when hotspot is turned on, that name is gone. Also the ip address changes.

So if you are able to get the Wifi config before enabling the hotspot, first of all you can use intf.getName() to get a reference to it.

Second, the ip changed, so if you know which interface the wifi is in CONNECTED mode, you can use that info to identify it later on after enabling the hotspot.

Below is some code I used for debugging. I just spit out everything I can find, make a huge mess then clean it up when I figured my problem out. GL

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Collections;
import android.net.ConnectivityManager;

textStatus = (TextView) findViewById(R.id.textStatus);

try {
  for (NetworkInterface intf : Collections.list(NetworkInterface.getNetworkInterfaces())) {
    for (InetAddress addr : Collections.list(intf.getInetAddresses())) {
      if (!addr.isLoopbackAddress()){
        textStatus.append("\n\n IP Address: " + addr.getHostAddress() );
        textStatus.append("\n" + addr.getHostName() );
        textStatus.append("\n" + addr.getCanonicalHostName() );
        textStatus.append("\n\n" + intf.toString() );
        textStatus.append("\n\n" + intf.getName() );
        textStatus.append("\n\n" + intf.isUp() );
      } 
    }
  }
} catch (Exception ex) {
  textStatus.append("\n\n Error getting IP address: " + ex.getLocalizedMessage() );
}


connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
allInfo = connectivity.getAllNetworkInfo();
mobileInfo = connectivity.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

textStatus.append("\n\n TypeName: " + mobileInfo.getTypeName());
textStatus.append("\n State: " + mobileInfo.getState());
textStatus.append("\n Subtype: " + mobileInfo.getSubtype());
textStatus.append("\n SubtypeName: " + mobileInfo.getSubtypeName());
textStatus.append("\n Type: " + mobileInfo.getType());
textStatus.append("\n ConnectedOrConnecting: " + mobileInfo.isConnectedOrConnecting());
textStatus.append("\n DetailedState: " + mobileInfo.getDetailedState());
textStatus.append("\n ExtraInfo: " + mobileInfo.getExtraInfo());
textStatus.append("\n Reason: " + mobileInfo.getReason());
textStatus.append("\n Failover: " + mobileInfo.isFailover());
textStatus.append("\n Roaming: " + mobileInfo.isRoaming()); 

textStatus.append("\n\n 0: " + allInfo[0].toString());
textStatus.append("\n\n 1: " + allInfo[1].toString());
textStatus.append("\n\n 2: " + allInfo[2].toString());

Answer 6

You can use this.

((WifiManager) mContext.getSystemService(Context.WIFI_SERVICE)).getDhcpInfo().serverAddress

Full Code

private String getHotspotIPAddress() {

    int ipAddress = mContext.getSystemService(Context.WIFI_SERVICE)).getDhcpInfo().serverAddress;

    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 = "";
    }

    return ipAddressString;

}