Get data from a website in android -

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i developed app in windows phone 8/8.1, trying develop android users. getting data website , displaying in app. website needs login userid,password. implemented in c#. unable in java. can guide me.

my code in c# :

            httpclienthandler handler = new httpclienthandler();             httpclient client = new httpclient(handler, false);              handler.allowautoredirect = true;             handler.preauthenticate = true;              uri vceuri = new uri("http://xxxx/default.aspx");             var html = await client.getstringasync(siteuri);              var doc = new htmlagilitypack.htmldocument();             doc.loadhtml(html);              var viewstatenode = doc.getelementbyid("__viewstate");             var eventvalidationnode = doc.getelementbyid("__eventvalidation");             var viewstate = viewstatenode.getattributevalue("value", "");             var eventvalidation = eventvalidationnode.getattributevalue("value", "");               var formcontent1 = new formurlencodedcontent(new[]         {             new keyvaluepair<string, string>("__viewstate", viewstate),              new keyvaluepair<string, string>("__eventvalidation", eventvalidation),             new keyvaluepair<string,string>("txtloginid",_username),             new keyvaluepair<string,string>("txtpwd",_pswd),             new keyvaluepair<string,string>("btnlogin","go%21")         });              var outputdoc = await client.postasync("http://xxx/default.aspx", formcontent1);              html = await outputdoc.content.readasstringasync();             doc.loadhtml(html);                              // parsing(doc);              var studentinfonode = doc.getelementbyid("divstudinfo");             var _studentinfonode1 = studentinfonode.childnodes;             var studentinfo = studentinfonode.childnodes[0].childnodes;

the above studentinfo object contain required data

i tried using httpclient + httppost ending in null exception :(

if ever worked on similar application can please me.

thanks


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