android - accessing JSON files, AsyncTask error -


there json output:

{"status":"error","data":null,"message":"required parameters not available."}

to access there json parsing java class , user function java class.

i having confusion on accessing json file on loginactivity inside asynctask. task throws null pointer exception. think not referring "status" causing ... real reason why ?? new android have no idea. please help. code follows:

jsonparser.java

public class jsonparser {      static inputstream = null;     static jsonobject jobj = null;     static string json = "";     static int = '1';     static int post ='2';      // constructor     public jsonparser() {      }      public jsonobject getjsonfromurl(string url, list<namevaluepair> params, int method) throws urisyntaxexception {          defaulthttpclient httpclient = new defaulthttpclient();         httpresponse httpresponse = null;         httpentity httpentity = null;          try {             switch (method) {             case 1:                  if(params!=null){                     string paramstring = urlencodedutils.format(params, "utf-8");                     url += "?" + paramstring;                    }                  log.e("url", url);                 httpget httpget = new httpget(url);                 httpresponse = httpclient.execute(httpget);                 httpentity = httpresponse.getentity();                            break;             case 2:                  httppost postrequest = new httppost(url);                 postrequest.setentity(new urlencodedformentity(params));                 httpresponse = httpclient.execute(postrequest);                 httpentity = httpresponse.getentity();                  break;             }              = httpentity.getcontent();           } catch (unsupportedencodingexception e) {             e.printstacktrace();         } catch (clientprotocolexception e) {             e.printstacktrace();         } catch (ioexception e) {             e.printstacktrace();         }          try {             bufferedreader reader = new bufferedreader(new inputstreamreader(                     is, "iso-8859-1"), 8);             stringbuilder sb = new stringbuilder();             string line = null;             while ((line = reader.readline()) != null) {                 sb.append(line + "\n");             }             is.close();             json = sb.tostring();             log.e("json", json);         } catch (exception e) {             log.e("buffer error", "error converting result " + e.tostring());         }          // try parse string json object         try {             jobj = new jsonobject(json);                     } catch (jsonexception e) {             log.e("json parser", "error parsing data " + e.tostring());         }          // return json string         return jobj;      }  }

userfunction.java

public class userfunctions {      private jsonparser jsonparser;     private static string url_login = "http://10.0.0.2/blamethestars2/public/api/user/login";      static int = '1';     static int post ='2';      // constructor     public userfunctions(){         jsonparser = new jsonparser();     }      public jsonobject login(string username, string password){         jsonobject json = null;          list<namevaluepair> params = new arraylist<namevaluepair>();         params.add(new basicnamevaluepair("email", username));         params.add(new basicnamevaluepair("password", password));         try {             json = jsonparser.getjsonfromurl(url_login, params, post);          } catch (exception e) {             // todo auto-generated catch block             e.printstacktrace();         }         return json;      } }

loginactivity.java

public class loginactivity extends activity{      edittext username, password;     string user, pass;     button submit;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.sign_in);         username = (edittext)findviewbyid(r.id.user_email);         password = (edittext)findviewbyid(r.id.user_password);           submit = (button)findviewbyid(r.id.user_submit);           submit.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 // todo auto-generated method stub                 user = username.gettext().tostring();                 pass = password.gettext().tostring();                 if(user.length()<1 || pass.length()<1){                     toast.maketext(getapplicationcontext(), "fill user name , pass", toast.length_short).show();                 }else{                     new asynconnection().execute();                }             }         });     }         public class asynconnection extends asynctask<void, void, void>{         jsonobject jsarray;         @override         protected void doinbackground(void... params) {             userfunctions users = new userfunctions();             jsarray = users.login(user, pass);                    return null;         }     }  }

for trying check if api response appears on logcat or not

logcat error:

04-18 16:07:01.190: w/system.err(874): java.lang.nullpointerexception 04-18 16:07:01.260: w/system.err(874):  @ com.example.btshome.library.jsonparser.getjsonfromurl(jsonparser.java:66) 04-18 16:07:01.260: w/system.err(874):  @ com.example.btshome.library.userfunctions.login(userfunctions.java:38) 04-18 16:07:01.270: w/system.err(874):  @ com.example.btshome.loginactivity$asynconnection.doinbackground(loginactivity.java:54) 04-18 16:07:01.270: w/system.err(874):  @ com.example.btshome.loginactivity$asynconnection.doinbackground(loginactivity.java:1) 04-18 16:07:01.280: w/system.err(874):  @ android.os.asynctask$2.call(asynctask.java:287) 04-18 16:07:01.280: w/system.err(874):  @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:305) 04-18 16:07:01.280: w/system.err(874):  @ java.util.concurrent.futuretask.run(futuretask.java:137) 04-18 16:07:01.293: w/system.err(874):  @ android.os.asynctask$serialexecutor$1.run(asynctask.java:230) 04-18 16:07:01.293: w/system.err(874):  @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1076) 04-18 16:07:01.300: w/system.err(874):  @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:569) 04-18 16:07:01.320: w/system.err(874):  @ java.lang.thread.run(thread.java:856)


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