java - Failed using ListAdapter in extends Fragment -

i trying update json data listview. failed when using listadapter. fragment didnt allow ? insist want use extends fragment. there method on ?

please me. thanks.

here part of whole code.

 public class schedulefragment extends fragment {       public progressdialog pdialog;      private listview mylistview;      // creating json parser object     jsonparser jparser = new jsonparser();      arraylist<hashmap<string, string>> subjectlist;           // url subjects list     private static string url_all_subjects = "http://192.168.1.12/android_project/get_subjects.php";      // json node names     private static final string tag_success = "success";     private static final string tag_student = "students";     private static final string tag_matrix_id = "matrix";     private static final string tag_name = "name";      // subject jsonarray     jsonarray subject = null;   public schedulefragment(){}  @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     view rootview = inflater.inflate(r.layout.fragment_schedule, container, false);     //------------------------------------creating listview-----------------------      // loading subject in background thread     new loadallsubject().execute();   // hashmap listview     subjectlist = new arraylist<hashmap<string, string>>();      mylistview = (listview) rootview.findviewbyid(r.id.textviewmatrix);      // on selecting single subject     mylistview.setonitemclicklistener(new onitemclicklistener() {          @override         public void onitemclick(adapterview<?> parent, view view,                 int position, long id) {             // getting values selected listitem             string matrix_id = ((textview) view.findviewbyid(r.id.textviewmatrix)).gettext()                     .tostring();              // starting new intent             intent in = new intent(getactivity().getapplicationcontext(),                     singlesubject.class);              // sending matrix id next activity             in.putextra(tag_matrix_id, matrix_id);              // starting new activity , expecting response             startactivityforresult(in, 100);         }     });      return rootview; }  /**  * background async task load product making http request  * */ class loadallsubject extends asynctask<string, string, string> {      /**      * before starting background thread show progress dialog      * */      @override     protected void onpreexecute() {         super.onpreexecute();         pdialog = progressdialog.show(schedulefragment.this.getactivity(), "progress", "loading subjects. please wait...", false);         //pdialog.setmessage("loading subjects. please wait...");         pdialog.setindeterminate(false);         pdialog.setcancelable(false);     }      /**      * getting products url      * */     protected string doinbackground(string... args) {         // building parameters         list<namevaluepair> params = new arraylist<namevaluepair>();         // getting json string url         jsonobject json = jparser.makehttprequest(url_all_subjects, "get", params);          // check log cat json reponse         log.d("all products: ", json.tostring());          try {             // checking success tag             int success = json.getint(tag_success);              if (success == 1) {                 // products found                 // getting array of subject                 subject = json.getjsonarray(tag_student);                  // looping through subjects                 (int = 0; < subject.length(); i++) {                     jsonobject c = subject.getjsonobject(i);                      // storing each json item in variable                     string id = c.getstring(tag_matrix_id);                     string name = c.getstring(tag_name);                      // creating new hashmap                     hashmap<string, string> map = new hashmap<string, string>();                      // adding each child node hashmap key => value                     map.put(tag_matrix_id, id);                     map.put(tag_name, name);                      // adding hashlist arraylist                     subjectlist.add(map);                 }             } else {                 // no products found                 // launch add new product activity              }         } catch (jsonexception e) {             e.printstacktrace();         }          return null;     }      /**      * after completing background task dismiss progress dialog      * **/     protected void onpostexecute(string file_url) {         // dismiss dialog after getting products         pdialog.dismiss();         // updating ui background thread             public void run() {                 /**                  * updating parsed json data listview                  * */                 listadapter adapter = new simpleadapter(                          getactivity(), subjectlist,                         r.layout.all_subject, new string[] { tag_matrix_id,                                 tag_name},                         new int[] { r.id.matrix_id, r.id.name });                 // updating listview                 mylistview.setlistadapter(adapter);             }       }  }   } 

this all_subject.xml

 <!-- subject matrix_id - hidden - used pass other activity --> <textview     android:id="@+id/matrix_id"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:visibility="gone" />   <!-- name label --> <textview     android:id="@+id/name"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:paddingtop="6dip"     android:paddingleft="6dip"     android:textsize="17dip"     android:textstyle="bold" /> 

you need extend listframgent. setlistadapter method of listfragment.

no need use runonuithread. onpostexecute invoked on ui thread.

edit:

@override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     view rootview = inflater.inflate(r.layout.fragment_schedule, container, false);     subjectlist = new arraylist<hashmap<string, string>>();     mylistview = (listview) rootview.findviewbyid(r.id.textviewmatrix);      new loadallsubject().execute();     mylistview.setonitemclicklistener(new onitemclicklistener() {          @override         public void onitemclick(adapterview<?> parent, view view,                 int position, long id) {             string matrix_id = ((textview) view.findviewbyid(r.id.textviewmatrix)).gettext()                     .tostring();              // starting new intent             intent in = new intent(getactivity().getapplicationcontext(),                     singlesubject.class);              // sending matrix id next activity             in.putextra(tag_matrix_id, matrix_id);              // starting new activity , expecting response             startactivityforresult(in, 100);         }     });      return rootview; } 

then

  protected void onpostexecute(string file_url) {    super.onpostexecute(file_url);      pdialog.dismiss();     listadapter adapter = new simpleadapter(                        getactivity(), subjectlist,                     r.layout.all_subject, new string[] { tag_matrix_id,                             tag_name},                     new int[] { r.id.matrix_id, r.id.name });     mylistview.setadapter(adapter);    }