CustomListViewAddapter in Fragment Android -

i have problem customlistviewaddapter in fragment. have main activity has slide menu , try show customlistview in it. , error when tried use try-catch

here part of main activity call fragment slide menu

@suppresslint("newapi")public class mainactivity extends activity { .......some code.....  @targetapi(build.version_codes.honeycomb) @suppresslint("newapi") private void displayview(int position) {     log.i("position***", position + "");     // update main content replacing fragments     fragment fragment = null;     fragment fragment1 = null;     switch (position) {     case 0:         fragment = new homefragment();         fragment1 = fragment;         log.i("fragment1", fragment1 + "");         break;     case 1:         fragment = new findpeoplefragment();         break;     case 2:         fragment = new photosfragment();         break;     case 3:         fragment = new communityfragment();         break;     case 4:         fragment = new pagesfragment();         break;     case 5:         fragment = new whatshotfragment();         break;      default:         break;     }      if (fragment != null) {         fragmentmanager fragmentmanager = getfragmentmanager();         fragmentmanager.begintransaction()                 .replace(r.id.frame_container, fragment).commit();          // update selected item , title, close drawer         mdrawerlist.setitemchecked(position, true);         mdrawerlist.setselection(position);         settitle(navmenutitles[position]);         mdrawerlayout.closedrawer(mdrawerlist);     } else {         // error in creating fragment         log.e("mainactivity", "error in creating fragment");     }  } code } 

he homefragment.java

 public class homefragment extends listfragment implements onclicklistener { @override public void onactivitycreated(bundle savedinstancestate) {     // todo auto-generated method stub     super.onactivitycreated(savedinstancestate);   }        @override     public view oncreateview(layoutinflater inflater, viewgroup container,bundle savedinstancestate) {           // inflate layout fragment         view fragprocatview = inflater.inflate(r.layout.fragment_home, container,false);           mainlistview = (listview) fragprocatview.findviewbyid(r.id.list);          /*          * listactivity has default layout consists of single,          * full-screen list in center of screen. however,we can          * customize screen layout setting our own view layout          * setcontentview() in oncreate(). this, our layout must contain          * listview object id "@android:id/list". ( not          * android:id="@+id/list" ). if define listview android:id          * attribute set @+id/list throw below runtimeexception          */          datasource = new etpupdatasource(getactivity());          datasource.open();         addedetpup = datasource.getallrecordlist();         datasource.close();          log.i("dbcount", addedetpup.size() + "");         // if first time run app maybe dont have data         // on need check         // , call our list view again         if (addedetpup.size() == 0) {             if (internetstatus.getinstance(getactivity()).havenetworkconnection(getactivity())) {                 log.i("xxxx return haveconnectedwifi", "return haveconnectedwifixxxx");                 alertdialog.builder alertbuilder = new alertdialog.builder(getactivity());                 alertbuilder.setmessage("there no dara show. want add new data?");                 alertbuilder.setcancelable(false);                 alertbuilder.setpositivebutton("yes",                         new dialoginterface.onclicklistener() {                              public void onclick(dialoginterface dialog,                                     int which) {                                  // call json data server                                  new jsonparse().execute();                                 refreshlist();                              }                          });                  alertbuilder.setnegativebutton("no",                         new dialoginterface.onclicklistener() {                              public void onclick(dialoginterface dialog,                                     int which) {                                  dialog.cancel();                              }                         });                  alertdialog alert = alertbuilder.create();                 alert.show();              } else {                 toast.maketext(                         getactivity(),                         "there no internet connection available, please make sure device connected internet via wifi or mobile internet!",                         toast.length_long).show();             }         }          // create new object customlistviewaddapter , pass         // context , list of etpup data           try{             arrayadapter<getalldata> adaptermain = new customlistviewaddapter(getactivity(), addedetpup);             mainlistview.setadapter(adaptermain);              //mainlistview.setadapter(new customlistviewaddapter(getactivity(), addedetpup));         }catch(exception e){             log.e("error happened ", "during creating list view");             log.e("error happened ", e.tostring());         }          // registerforcontextmenu(mainlistview.getlistview());          btngetdata = (button) getview().findviewbyid(r.id.getdata);         btngetdata.setonclicklistener(this);            btnshowfav = (button) getview().findviewbyid(r.id.showfav);         btnshowfav.setonclicklistener(this);            return inflater.inflate(r.layout.fragment_home, container, false);     }          @override public void onclick(view v) {     switch (v.getid()) {     case r.id.getdata:          new jsonparse().execute();      case r.id.showfav:         log.i("show fav", "in show fav btn");         intent showfav = new intent(getactivity(), showfavorite.class);         startactivity(showfav);          break;     } }  public void refreshlist() {     log.i("refresh list", "i'm in refresh list");      // create new object customlistviewaddapter , pass     // context , list of etpup data     datasource.open();     addedetpup = datasource.getallrecordlist();     datasource.close();      log.i("dbcount*****00******", addedetpup.size() + "");      try{     arrayadapter<getalldata> adaptermain = new customlistviewaddapter(getactivity(), addedetpup);     mainlistview.setadapter(adaptermain);      }catch(exception e){         log.e("error happened in refresh", "during creating list view");         log.e("error happened ", e.tostring());     }     // registerforcontextmenu(((listactivity) mainlistview).getlistview());      // show simple list      /*      * arrayadapter<getalldata> adapter = new arrayadapter<getalldata>(this,      * android.r.layout.simple_expandable_list_item_1,addedzekrfields2);      * setlistadapter(adapter); registerforcontextmenu(getlistview());      */ } 

and here log cat

06-01 23:24:38.861: d/dalvikvm(1873): gc_for_alloc freed 96k, 6% free 3142k/3308k, paused 30ms, total 32ms blockquote  06-01 23:24:38.871: i/dalvikvm-heap(1873): grow heap (frag case) 4.207mb 1127536-byte allocation  06-01 23:24:38.911: d/dalvikvm(1873): gc_for_alloc freed 2k, 4% free 4240k/4412k, paused 31ms, total 31ms  06-01 23:24:39.021: i/position***(1873): 2  06-01 23:24:39.331: d/gralloc_goldfish(1873): emulator without gpu emulation detected.  06-01 23:24:42.801: i/in draw click***(1873): 000000000000011123  06-01 23:24:42.801: i/position***(1873): 0  06-01 23:24:42.811: i/fragment1(1873): homefragment{b1f98308}  06-01 23:24:43.061: d/dalvikvm(1873): gc_for_alloc freed 80k, 4% free 4657k/4816k, paused 24ms, total 29ms  06-01 23:24:43.121: i/etpup(1873): database open  06-01 23:24:43.141: i/etpup(1873): database close  06-01 23:24:43.141: i/dbcount(1873): 3  06-01 23:24:43.161: e/error happened(1873): during creating list view  06-01 23:24:43.161: e/error happened(1873): java.lang.nullpointerexception  06-01 23:24:43.161: d/androidruntime(1873): shutting down vm  06-01 23:24:43.161: w/dalvikvm(1873): threadid=1: thread exiting uncaught exception (group=0xb1b08ba8)  06-01 23:24:43.181: e/androidruntime(1873): fatal exception: main  06-01 23:24:43.181: e/androidruntime(1873): process: com.pishgamanit.etpup, pid: 1873  06-01 23:24:43.181: e/androidruntime(1873): java.lang.nullpointerexception  06-01 23:24:43.181: e/androidruntime(1873):     @ com.pishgamanit.etpup.homefragment.oncreateview(homefragment.java:171)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.app.fragment.performcreateview(fragment.java:1700)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:890)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:1062)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.app.backstackrecord.run(backstackrecord.java:684)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.app.fragmentmanagerimpl.execpendingactions(fragmentmanager.java:1447)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.app.fragmentmanagerimpl$1.run(fragmentmanager.java:443)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.os.handler.handlecallback(handler.java:733)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.os.handler.dispatchmessage(handler.java:95)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.os.looper.loop(looper.java:136)  06-01 23:24:43.181: e/androidruntime(1873):     @ android.app.activitythread.main(activitythread.java:5017)  06-01 23:24:43.181: e/androidruntime(1873):     @ java.lang.reflect.method.invokenative(native method)  06-01 23:24:43.181: e/androidruntime(1873):     @ java.lang.reflect.method.invoke(method.java:515)  06-01 23:24:43.181: e/androidruntime(1873):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:779)  06-01 23:24:43.181: e/androidruntime(1873):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:595)  06-01 23:24:43.181: e/androidruntime(1873):     @ dalvik.system.nativestart.main(native method)  06-01 23:29:43.301: i/process(1873): sending signal. pid: 1873 sig: 9 

here main xml

<android.support.v4.widget.drawerlayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" >  <framelayout     android:id="@+id/frame_container"     android:layout_width="match_parent"     android:layout_height="match_parent" />  <!-- listview display slider menu -->  <listview     android:id="@+id/list_slidermenu"     android:layout_width="240dp"     android:layout_height="match_parent"     android:layout_gravity="start"     android:background="@color/list_background"     android:choicemode="singlechoice"     android:divider="@color/list_divider"     android:dividerheight="1dp"     android:listselector="@drawable/list_selector"      /> 

and here fragment_home.xml

    <?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/drawer_layout1111111111111"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin" >      <listview         android:id="@android:id/list"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_above="@+id/getdata"         android:layout_alignparentleft="true" />      <button         android:id="@+id/getdata"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignbaseline="@+id/showfav"         android:layout_alignbottom="@+id/showfav"         android:layout_alignleft="@+id/list"         android:text="get data" />      <button         android:id="@+id/showfav"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:layout_alignright="@android:id/list"         android:layout_marginbottom="14dp"         android:layout_marginright="16dp"         android:text="show favorites" />      </relativelayout> 

i did lot of researches , i'm stuck here week :(

i appricate , advice

first correct should

return fragprocatview;  

instead of

return inflater.inflate(r.layout.fragment_home, container, false); 

in oncreateview(.....) in homefragment

update:

first remove listfragment , extends simple fragment homefragment

your should change android:id="@android:id/list" android:id="@+id/list"

and should change this

    btngetdata = (button) getview().findviewbyid(r.id.getdata)     btnshowfav = (button) getview().findviewbyid(r.id.showfav); 

to

    btngetdata = (button) fragprocatview.findviewbyid(r.id.getdata)     btnshowfav = (button) fragprocatview.findviewbyid(r.id.showfav);