android 获取ip

//get public net ip

public static String GetNetIp()

{
   URL infoUrl = null;
   InputStream inStream = null;
   try
   {
    //http://iframe.ip138.com/ic.asp
       //infoUrl = new URL("http://city.ip138.com/city0.asp");
       infoUrl = new URL("http://iframe.ip138.com/ic.asp");
       URLConnection connection = infoUrl.openConnection();
       HttpURLConnection httpConnection = (HttpURLConnection)connection;
       int responseCode = httpConnection.getResponseCode();
       if(responseCode == HttpURLConnection.HTTP_OK)
       { 
           inStream = httpConnection.getInputStream(); 
           BufferedReader reader = new BufferedReader(new InputStreamReader(inStream,"utf-8"));
           StringBuilder strber = new StringBuilder();
           String line = null;
           while ((line = reader.readLine()) != null) 
               strber.append(line + "\n");
           inStream.close();
           //从反馈的结果中提取出IP地址
           int start = strber.indexOf("[");
           int end = strber.indexOf("]", start + 1);
           line = strber.substring(start + 1, end);
           return line; 
       }
   }
   catch(MalformedURLException e) {
       e.printStackTrace();
   }
   catch (IOException e) {
       e.printStackTrace();
   }
   return null;

}

http://blog.csdn.net/h7870181/article/details/8480452