private String getLocalIPAddress() throws SocketException{      for(Enumeration
    
      en = NetworkInterface.getNetworkInterfaces();en.hasMoreElements();){          NetworkInterface intf = en.nextElement();          for(Enumeration
     
       enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();){              InetAddress inetAddress = enumIpAddr.nextElement();              if(!inetAddress.isLoopbackAddress())){                  return inetAddress.getHostAddress().toString();              }          }      }      return "null";  }
     
    

但是，在android4.0以上系统中，上面的代码仅能够返回一个ipv6的地址，如果需要获取ip v4的地址，可以这么更改：

private String getLocalIPAddress() throws SocketException{      for(Enumeration
    
      en = NetworkInterface.getNetworkInterfaces();en.hasMoreElements();){          NetworkInterface intf = en.nextElement();          for(Enumeration
     
       enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();){              InetAddress inetAddress = enumIpAddr.nextElement();              if(!inetAddress.isLoopbackAddress() && 
      (inetAddress instanceof Inet4Address)){                  return inetAddress.getHostAddress().toString();              }          }      }      return "null";  }