android - Reason why i'm not getting Json Response from server -

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 public  string post(string url){         inputstream inputstream = null;         string result = "";         try {              // 1. create httpclient             httpclient httpclient = new defaulthttpclient();              // 2. make post request given url             httppost httppost = new httppost(url);              string json = "";              // 3. build jsonobject             jsonobject jsonobject = new jsonobject();             jsonobject.accumulate("username","example@gmail.com");             jsonobject.accumulate("password","123456!");             jsonobject.accumulate("appid","andapp");              // 4. convert jsonobject json string             json = jsonobject.tostring();              // ** alternative way convert person object json string usin jackson lib              // objectmapper mapper = new objectmapper();             // json = mapper.writevalueasstring(person);               // 5. set json stringentity             stringentity se = new stringentity(json);              // 6. set httppost entity             httppost.setentity(se);              // 7. set headers inform server type of content                httppost.setheader("accept", "application/json");             httppost.setheader("content-type", "application/json");              // 8. execute post request given url             httpresponse httpresponse = httpclient.execute(httppost);              toast.maketext(getbasecontext()," text",toast.length_short).show();             // 9. receive response inputstream             inputstream = httpresponse.getentity().getcontent();              // 10. convert inputstream string             if(inputstream != null)                 result = convertinputstreamtostring(inputstream);             else                 result = "did not work!";          } catch (exception e) {             log.d("inputstream", e.getlocalizedmessage());         }          // 11. return result         return result;     }  private class httpasynctask extends asynctask<string, void, string> {         @override         protected string doinbackground(string... urls) {           // toast.maketext(getbasecontext(), "post invoked", toast.length_short).show();             return post(urls[0]);         }         // onpostexecute displays results of asynctask.         @override         protected void onpostexecute(string result) {             toast.maketext(getbasecontext(), "data sent!"+result+" don", toast.length_long).show();        }     }   private static string convertinputstreamtostring(inputstream inputstream) throws ioexception{         bufferedreader bufferedreader = new bufferedreader( new inputstreamreader(inputstream));         string line = "";         string result = "";         while((line = bufferedreader.readline()) != null)             result += line;          inputstream.close();         return result;      }

i tried invoke post method object of httpasynctask class, targeted url passed. toast execeuted in onpostexecute() popping message "data sent!done", tells value of 'result' variable null. why getting this? fault? please fix this.


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