Android学习之获得ip地址

package cn.net;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;

public class IpUtil extends Activity {
    /** Called when the activity is first created. */
    @Override

    public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            
            //获取wifi服务
            WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
            //判断wifi是否开启
            if (!wifiManager.isWifiEnabled()) { 
            wifiManager.setWifiEnabled(true);   
            } 
            //使用wifi获得有问题,可能要真机测试
            WifiInfo wifiInfo = wifiManager.getConnectionInfo();      
            int ipAddress = wifiInfo.getIpAddress();  
            String ip = intToIp(ipAddress);  
            EditText et = (EditText)findViewById(R.id.EditText01);
            EditText e2=(EditText)findViewById(R.id.editText2);
            String ip2=getLocalIpAddress();
            et.setText(ipAddress);
            e2.setText(ip2);
        }    
        //初始化为0.0.0.0
        private String intToIp(int i) {      
            
              return (i & 0xFF ) + "." +      
            ((i >> 8 ) & 0xFF) + "." +      
            ((i >> 16 ) & 0xFF) + "." +      
            ( i >> 24 & 0xFF) ;
         }  



    //这个可用，
    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; 
        }

     

}