json - android FATAL EXCEPTION: AsyncTask #2 -


i'm getting fatal exception: asynctask #2 in application. can please tell me why , tell me need do. pretty confused right , need little help. 

07-25 11:18:27.014: e/androidruntime(784): fatal exception: asynctask #2 07-25 11:18:27.014: e/androidruntime(784): java.lang.runtimeexception: error occured while executing doinbackground() 07-25 11:18:27.014: e/androidruntime(784):  @ android.os.asynctask$3.done(asynctask.java:299) 07-25 11:18:27.014: e/androidruntime(784):  @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:352) 07-25 11:18:27.014: e/androidruntime(784):  @ java.util.concurrent.futuretask.setexception(futuretask.java:219) 07-25 11:18:27.014: e/androidruntime(784):  @ java.util.concurrent.futuretask.run(futuretask.java:239) 07-25 11:18:27.014: e/androidruntime(784):  @ android.os.asynctask$serialexecutor$1.run(asynctask.java:230) 07-25 11:18:27.014: e/androidruntime(784):  @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1080) 07-25 11:18:27.014: e/androidruntime(784):  @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:573) 07-25 11:18:27.014: e/androidruntime(784):  @ java.lang.thread.run(thread.java:856) 07-25 11:18:27.014: e/androidruntime(784): caused by: java.lang.nullpointerexception 07-25 11:18:27.014: e/androidruntime(784):  @ com.theproblemsolver.jsonparsser.getjsonfromuri(jsonparsser.java:35) 07-25 11:18:27.014: e/androidruntime(784):  @ com.theproblemsolver.asynctask.doinbackground(mainactivity.java:64) 07-25 11:18:27.014: e/androidruntime(784):  @ com.theproblemsolver.asynctask.doinbackground(mainactivity.java:1) 07-25 11:18:27.014: e/androidruntime(784):  @ android.os.asynctask$2.call(asynctask.java:287) 07-25 11:18:27.014: e/androidruntime(784):  @ java.util.concurrent.futuretask.run(futuretask.java:234)

main class

public class mainactivity extends activity {      edittext et;     button getanswer;      jsonarray resultsset = null; {}      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);           button getanswer = (button) findviewbyid(r.id.button1);         getanswer.setonclicklistener(new onclicklistener() {           public string uri;          @override         public void onclick(view v) {             new asynctask().execute(uri);             intent = new intent(mainactivity.this, listview.class);             startactivity(i);         }          });     }  }        class asynctask extends asynctask<string, void, jsonobject> {               private static final string tag_results = "resultsset";              private static final string tag_subject = "subject";              private static final string tag_numanswers = "numanswers";              private static final string tag_question = "question";              private static final string tag_question_content = "content";              private static final string tag_question_chosenanswer = "chosenanswer";              private static final string tag_question_answers = "answers";             public jsonarray json;           @override          protected jsonobject doinbackground(string... params) {               jsonparsser jparser = new jsonparsser();               string uri = params[0];               jsonobject json = jparser.getjsonfromuri(uri);               return json ;           }{ }              @override              protected void onpostexecute(jsonobject json) {                   jsonarray resultsset = null; {                  try {                      resultsset = json.getjsonarray(tag_results);                 } catch (jsonexception e) {                    e.printstacktrace();              }              return;         }}}

jsonparsser class

public class jsonparsser {      static inputstream = null;     static jsonobject jobj = null;     static string json = "";     edittext et;      public jsonparsser () {     }      public jsonobject getjsonfromuri(string uri) {          try{         httpclient client = new defaulthttpclient();         try {             uri website = new uri("http://example=" + et.gettext() + "json");             httpget request = new httpget();             request.seturi(website);             try {                 httpresponse response = client.execute(request);             httpentity httpentity = response.getentity();             = httpentity.getcontent();              } catch (clientprotocolexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             } catch (ioexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }         } catch (urisyntaxexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }         return jobj;          }finally{}      }{      }}

instanceofjsonparsser class

public class jsonparserinstance {      jsonparsser jparser = new jsonparsser();      public string uri;      jsonobject json = jparser.getjsonfromuri(uri);        private static final string tag_results = "resultsset";      private static final string tag_subject = "subject";      private static final string tag_numanswers = "numanswers";      private static final string tag_question = "question";      private static final string tag_question_content = "content";      private static final string tag_question_chosenanswer = "chosenanswer";      private static final string tag_question_answers = "answers";              jsonarray resultsset = null; {      try {        resultsset = json.getjsonarray(tag_results);         for(int = 0; < resultsset.length(); i++){            jsonobject r = resultsset.getjsonobject(i);             string subject = r.getstring(tag_subject);            string nmanswers = r.getstring(tag_numanswers);             jsonobject question = r.getjsonobject(tag_question);            string content = question.getstring(tag_question_content);            string chosenanswer = question.getstring(tag_question_chosenanswer);            string answers = question.getstring(tag_question_answers);         }     } catch (jsonexception e) {        e.printstacktrace();  }}} 

uri website = new uri("http://example=" + et.gettext() + "json");

you didn't connect edittext et it's view. et.gettext give error.

uri website = new uri("http://example=" + et.gettext() + "json");

change uri website = uri;

and pass uri while processing doinbackground

like - 

string uri = "http://www.example.com/example.json";               jsonobject json = jparser.getjsonfromuri(uri);

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