Android post request (JSON parameter) to the WCF restful WS -

i working on android application , have problem "post" request (as usual) wcf restful ws.

restful method:

 [operationcontract]  [webinvoke(method = "post", requestformat = webmessageformat.json, uritemplate = "createuser")]  string createuser(string user); 

i order find error put under comment body of method implementation, , looks like:

public string createuser(string user)         {         return user;         } 

i have been calling method hundreds time js(jquery, ajax), json.stringify(datos), without problem. need same thing android application. snippet of code cause problem:

jsonobject user =  new jsonobject(); user.put("id", "15"); user.put("name", "john"); user.put("city", "france"); user.put("email", "myemail"); user.put("password", "mypass");  httpclient client = new defaulthttpclient(); uri website = new uri("http://10.0.2.2/autooglasi/service1.svc/createuser"); httppost request = new httppost(); request.setentity(new stringentity(user.tostring())); request.addheader("content-type", "application/json");       request.seturi(website); httpresponse response = client.execute(request); 

i getting response server (there no error on client side):

the exception message 'there error deserializing object of type system.string. end element 'root' namespace '' expected. found element 'id' namespace ''.'.see server logs more details. exception stack trace is: </p> <p>at system.servicemodel.dispatcher.operationformatter.deserializerequest(message message,  object[] parameters) @ system.servicemodel.dispatcher.demultiplexingdispatchmessageformatter.deserializerequest(me    ssage message, object[] parameters) @    system.servicemodel.dispatcher.uritemplatedispatchformatter.deserializerequest(message      message, object[] parameters) @ system.servicemodel.dispatcher.dispatchoperationruntime.deserializeinputs(messagerpc&amp;      rpc) @  system.servicemodel.dispatcher.dispatchoperationruntime.invokebegin(messagerpc&amp; rpc) @  system.servicemodel.dispatcher.immutabledispatchruntime.processmessage5(messagerpc&amp; rpc) @ system.servicemodel.dispatcher.immutabledispatchruntime.processmessage31(messagerpc&amp; rpc)  @ system.servicemodel.dispatcher.messagerpc.process(boolean isoperationcontextset)</p> </div> </body></html> 

any advice or help, please?

i have funnily solved problem:

1) had add bodystyle = webmessagebodystyle.wrappedrequest service method avoid error above. not understand why, because worked jquery ajax call without bodystyle parameter. appreciate if explain it?

2)i used: string s = "{\"id\":\"1\", \"name\":\"john\", \"user\":\"new yourk\", \"email\":\"mypass\", \"password\":\"myemail\"}"; test string. changed name of parameter "city" user. sent service , response got "new yourk", 1 parameter has name ws method parameter.

it means need send 1 parameter name "user" , value. like:

 jsonobject uservalue =  new jsonobject();  jsonobject user =  new jsonobject();   uservalue .put("id", "15");  uservalue .put("name", "john");  uservalue .put("city", "france");  uservalue .put("email", "myemail");  uservalue .put("password", "mypass");   user.put("user", uservalue.tostring()); 

now request complete , server side can process user parameters.

note: important add "uservalue" string (user.put("user", uservalue.tostring())). if add json (user.put("user", uservalue)) not work.