java - Create a json string with List<NameValuePair> in android -

i want send http request url android. ios developer , trying learn android. used send json string in ios below

 {"function":"login", "parameters": {"username": "nithin""password": "123456"}} 

how can send in android? tried list<namevaluepair> can't find proper solution.

full code of tried -

    httpclient httpclient = new defaulthttpclient();     httppost httppost = new httppost(url);      try {         // add data         list<namevaluepair> namevaluepairs = new arraylist<namevaluepair>(2);         namevaluepairs.add(new basicnamevaluepair("function", "login"));         namevaluepairs.add(new basicnamevaluepair("username", "nithin"));         namevaluepairs.add(new basicnamevaluepair("password", "123456"));         httppost.setentity(new urlencodedformentity(namevaluepairs));          // execute http post request         httpresponse response = httpclient.execute(httppost);      } catch (clientprotocolexception e) {         // todo auto-generated catch block     } catch (ioexception e) {         // todo auto-generated catch block     } 

i think jsonstringer easy , useful here..

try this:

   httppost request = new httppost(url);    request.setheader("accept", "application/json");    request.setheader("content-type", "application/json");    jsonstringer vm;    try {          vm = new jsonstringer().object().key("function")         .value(login).key("parameters").object()         .key("username")         .value(nithin).key("password").value("123456")         .endobject().endobject();   stringentity entity = new stringentity(vm.tostring());   request.setentity(entity);   httpclient httpclient = new defaulthttpclient();   httpresponse response = httpclient.execute(request);