一个有用的类，集合了建立、连接热点；获取本机ip和连接此热点的手机的ip地址等方法

package dislab.gossipdog.wifi.adhoc;import java.io.BufferedReader;import java.io.FileReader;import java.lang.reflect.Method;import java.net.InetAddress;import java.net.NetworkInterface;import java.net.SocketException;import java.util.ArrayList;import java.util.Enumeration;import java.util.List;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.net.DhcpInfo;import android.net.wifi.ScanResult;import android.net.wifi.WifiConfiguration;import android.net.wifi.WifiInfo;import android.net.wifi.WifiManager;import android.os.Bundle;import android.text.format.Formatter;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class AdHocActivity extends Activity {private final String TAG = "WifiSoftAP";    public static final String WIFI_AP_STATE_CHANGED_ACTION =        "android.net.wifi.WIFI_AP_STATE_CHANGED";    public static final int WIFI_AP_STATE_DISABLING = 0;    public static final int WIFI_AP_STATE_DISABLED = 1;    public static final int WIFI_AP_STATE_ENABLING = 2;    public static final int WIFI_AP_STATE_ENABLED = 3;    public static final int WIFI_AP_STATE_FAILED = 4;          TextView result;WifiManager wifiManager;WifiReceiver receiverWifi;List<ScanResult> wifiList;//����l���б�      private List<WifiConfiguration> wifiConfiguration;StringBuilder resultList = new StringBuilder();public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);//setTitle("");result = (TextView) findViewById(R.id.result);wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);Button btnOpenAP = (Button)this.findViewById(R.id.btnOpenAP);btnOpenAP.setOnClickListener(new OnClickListener() {            public void onClick(View v) {if (!isApEnabled()){setWifiApEnabled(true);}        }        });Button btnCloseAP = (Button)this.findViewById(R.id.btnCloseAP);btnCloseAP.setOnClickListener(new OnClickListener() {            public void onClick(View v) {if (isApEnabled()){setWifiApEnabled(false);}        }        });Button btnScan = (Button)this.findViewById(R.id.btnScan);btnScan.setOnClickListener(new OnClickListener() {            public void onClick(View v) {if (!wifiManager.isWifiEnabled()) {wifiManager.setWifiEnabled(true);}StartScan();        }        });Button btnConnectAP = (Button)this.findViewById(R.id.btnConnectAP);btnConnectAP.setOnClickListener(new OnClickListener() {            public void onClick(View v) {connectAP();        }        });Button btnGetConnectedIP = (Button)this.findViewById(R.id.btnGetConnectedIP);btnGetConnectedIP.setOnClickListener(new OnClickListener() {            public void onClick(View v) {ArrayList<String> connectedIP = getConnectedIP();resultList = new StringBuilder();for(String ip : connectedIP){resultList.append(ip);resultList.append("\n");}result.setText(resultList);        }        });       findViewById(R.id.btnGetOwmId).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubLog.d("ZSM", getLocalIpAddress());WifiInfo wifiinfo = wifiManager.getConnectionInfo();  Log.v("getBSSID", wifiinfo.getBSSID() + "");  Log.v("getHiddenSSID", wifiinfo.getBSSID() + "");  Log.v("getIpAddress", Formatter.formatIpAddress(wifiinfo.getIpAddress()) + "");  Log.v("getLinkSpeed", Formatter.formatIpAddress(wifiinfo.getLinkSpeed()) + "");  Log.v("getMacAddress", wifiinfo.getMacAddress() + "");  Log.v("getNetworkId", Formatter.formatIpAddress(wifiinfo.getNetworkId()) + "");  Log.v("getRssi", wifiinfo.getRssi() + "");  Log.v("getSSID", wifiinfo.getSSID() + "");DhcpInfo dhcpinfo = wifiManager.getDhcpInfo();  Log.v("ipaddr", Formatter.formatIpAddress(dhcpinfo.ipAddress) + "");  Log.v("gatewau", Formatter.formatIpAddress(dhcpinfo.gateway) + "");  Log.v("netmask", Formatter.formatIpAddress(dhcpinfo.netmask) + "");  Log.v("dns1", Formatter.formatIpAddress(dhcpinfo.dns1) + "");  Log.v("dns1", Formatter.formatIpAddress(dhcpinfo.dns2) + "");  Log.v("serverAddress", Formatter.formatIpAddress(dhcpinfo.serverAddress) + "");  Log.d("ZSM", Formatter.formatIpAddress(dhcpinfo.serverAddress));  Log.d("ZSM","ipaddr  "+ Formatter.formatIpAddress(dhcpinfo.ipAddress));    }});}//此方法暂不可用    public String getLocalIpAddress() {          try {              for (Enumeration<NetworkInterface> en = NetworkInterface                      .getNetworkInterfaces(); en.hasMoreElements();) {                  NetworkInterface intf = en.nextElement();                  for (Enumeration<InetAddress> enumIpAddr = intf                          .getInetAddresses(); enumIpAddr.hasMoreElements();) {                      InetAddress inetAddress = enumIpAddr.nextElement();                      if (!inetAddress.isLoopbackAddress()) {                          return inetAddress.getHostAddress().toString();                      }                  }              }          } catch (SocketException ex) {              Log.e("WifiPreference IpAddress", ex.toString());          }          return null;      }            public String getLocalMacAddress() {          WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);          WifiInfo info = wifi.getConnectionInfo();          return info.getMacAddress();      }  protected void onPause() {if (receiverWifi != null)unregisterReceiver(receiverWifi);super.onPause();}protected void onResume() {if (receiverWifi != null)registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));super.onResume();}public void StartScan() {//��wifiwifiManager.setWifiEnabled(true);receiverWifi = new WifiReceiver();registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));wifiManager.startScan();result.setText("\nScaning...\n");  }public boolean setWifiApEnabled(boolean enabled) {if (enabled) { // disable WiFi in any casewifiManager.setWifiEnabled(false);}    try {WifiConfiguration apConfig = new WifiConfiguration();apConfig.SSID = "GossipDog";apConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);apConfig.preSharedKey = "abcdefgh";Method method = wifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE);return (Boolean) method.invoke(wifiManager, apConfig, enabled);} catch (Exception e) {Log.e(TAG, "Cannot set WiFi AP state", e);return false;}}public int getWifiApState() {try {Method method = wifiManager.getClass().getMethod("getWifiApState");return (Integer) method.invoke(wifiManager);} catch (Exception e) {Log.e(TAG, "Cannot get WiFi AP state", e);return WIFI_AP_STATE_FAILED;}}public boolean isApEnabled() {        int state = getWifiApState();        return WIFI_AP_STATE_ENABLING == state || WIFI_AP_STATE_ENABLED == state;}        //l��GossipDog      public void connectAP() {     WifiConfiguration gossipDog = new WifiConfiguration();        for (WifiConfiguration ap : wifiConfiguration) {         if (ap.SSID == "GossipDog") {        gossipDog = ap;        }        }                 if (gossipDog != null) {        gossipDog.preSharedKey = "abcdefgh";        gossipDog.networkId = wifiManager.addNetwork(gossipDog);        wifiManager.enableNetwork(gossipDog.networkId, true);        result.setText("l��AP�ɹ�");        }             }        //获取所有连接到本wifi热点的手机IP地址    private ArrayList<String> getConnectedIP() {        ArrayList<String> connectedIP = new ArrayList<String>();        try {        BufferedReader br = new BufferedReader(new FileReader("/proc/net/arp"));            String line;            while ((line = br.readLine()) != null) {            Log.d("meng", line);                String[] splitted = line.split(" +");                if (splitted != null && splitted.length >= 4) {                    String ip = splitted[0];                    connectedIP.add(ip);                }            }        } catch (Exception e) {            e.printStackTrace();        }                return connectedIP;    } class WifiReceiver extends BroadcastReceiver {public void onReceive(Context c, Intent intent) {resultList = new StringBuilder();wifiList = wifiManager.getScanResults();for (int i = 0; i < wifiList.size(); i++) {resultList.append(new Integer(i + 1).toString() + ".");resultList.append((wifiList.get(i)).toString());resultList.append("\n\n");}result.setText(resultList);//�õ����úõ�����l��      wifiConfiguration = wifiManager.getConfiguredNetworks();}}}