IP address of device using phone as access point

http://stackoverflow.com/questions/8324215/ip-address-of-device-using-phone-as-access-point

The following code will give you the ip adrress & other details of the wifi enabled devices connected to the the android hotspot device

Main.java

import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import com.whitebyte.hotspotclients.R;
import com.whitebyte.wifihotspotutils.ClientScanResult;
import com.whitebyte.wifihotspotutils.WifiApManager;

public class Main extends Activity {
TextView textView1;
WifiApManager wifiApManager;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

textView1 = (TextView) findViewById(R.id.textView1);
wifiApManager = new WifiApManager(this);

scan();
}

private void scan() {
ArrayList<ClientScanResult> clients = wifiApManager.getClientList(false);

textView1.append("Clients: \n");
for (ClientScanResult clientScanResult : clients) {
textView1.append("####################\n");
textView1.append("IpAddr: " + clientScanResult.getIpAddr() + "\n");
textView1.append("Device: " + clientScanResult.getDevice() + "\n");
textView1.append("HWAddr: " + clientScanResult.getHWAddr() + "\n");
textView1.append("isReachable: " + clientScanResult.isReachable() + "\n");
}
}

ClientScanResult.java

public class ClientScanResult {

private String IpAddr;

private String HWAddr;

private String Device;

private boolean isReachable;

public ClientScanResult(String ipAddr, String hWAddr, String device, boolean isReachable) {
super();
IpAddr = ipAddr;
HWAddr = hWAddr;
Device = device;
this.setReachable(isReachable);
}

public String getIpAddr() {
return IpAddr;
}

public void setIpAddr(String ipAddr) {
IpAddr = ipAddr;
}

public String getHWAddr() {
return HWAddr;
}

public void setHWAddr(String hWAddr) {
HWAddr = hWAddr;
}

public String getDevice() {
return Device;
}

public void setDevice(String device) {
Device = device;
}

public void setReachable(boolean isReachable) {
this.isReachable = isReachable;
}

public boolean isReachable() {
return isReachable;
}

[b]WIFI_AP_STATE.java[/b]

public enum WIFI_AP_STATE
{
WIFI_AP_STATE_DISABLING, WIFI_AP_STATE_DISABLED, WIFI_AP_STATE_ENABLING, WIFI_AP_STATE_ENABLED, WIFI_AP_STATE_FAILED
}

WifiApManager.java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.util.ArrayList;
import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.util.Log;

public class WifiApManager {
private final WifiManager mWifiManager;

public WifiApManager(Context context) {
mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
}

/**
* Gets a list of the clients connected to the Hotspot, reachable timeout is 300
* @param onlyReachables {@code false} if the list should contain unreachable (probably disconnected) clients, {@code true} otherwise
* @return ArrayList of {@link ClientScanResult}
*/
public ArrayList<ClientScanResult> getClientList(boolean onlyReachables) {
return getClientList(onlyReachables, 300);
}

/**
* Gets a list of the clients connected to the Hotspot
* @param onlyReachables {@code false} if the list should contain unreachable (probably disconnected) clients, {@code true} otherwise
* @param reachableTimeout Reachable Timout in miliseconds
* @return ArrayList of {@link ClientScanResult}
*/
public ArrayList<ClientScanResult> getClientList(boolean onlyReachables, int reachableTimeout) {
BufferedReader br = null;
ArrayList<ClientScanResult> result = null;

try {
result = new ArrayList<ClientScanResult>();
br = new BufferedReader(new FileReader("/proc/net/arp"));
String line;
while ((line = br.readLine()) != null) {
String[] splitted = line.split(" +");

if ((splitted != null) && (splitted.length >= 4)) {
// Basic sanity check
String mac = splitted[3];

if (mac.matches("..:..:..:..:..:..")) {
boolean isReachable = InetAddress.getByName(splitted[0]).isReachable(reachableTimeout);

if (!onlyReachables || isReachable) {
result.add(new ClientScanResult(splitted[0], splitted[3], splitted[5], isReachable));
}
}
}
}
} catch (Exception e) {
Log.e(this.getClass().toString(), e.getMessage());
} finally {
try {
br.close();
} catch (IOException e) {
Log.e(this.getClass().toString(), e.getMessage());
}
}

return result;
}
}