string - BaseAdapter class wont setAdapter inside Asynctask - Android -
i have asynctask gathers usernames, comments, , numbers. places them strings , suppose call baseadapter class, create adapter, , set adapter class. code doesn't work, crashes app, here code
public class dashboardactivity extends listactivity { string comments[]; string usernames[]; string numbers[]; listview lstcomments; class createcommentlists extends baseadapter{ context ctx_invitation; string[] listcomments; string[] listnumbers; string[] listusernames; public createcommentlists(string[] comments, string[] usernames, string[] numbers) { super(); listcomments = comments; listnumbers = usernames; listusernames = numbers; } @override public int getcount() { if(null == listcomments) { return 0; } // todo auto-generated method stub return listcomments.length; } @override public object getitem(int position) { // todo auto-generated method stub return listcomments[position]; } @override public long getitemid(int position) { // todo auto-generated method stub return 0; } @override public view getview(int position, view convertview, viewgroup parent) { // todo auto-generated method stub view v = null; try { string inflater = context.layout_inflater_service; layoutinflater li = (layoutinflater)ctx_invitation.getsystemservice(inflater); v = li.inflate(r.layout.list_item, null); textview commentview = (textview)v.findviewbyid(r.id.listcomment); textview numbersview = (textview)v.findviewbyid(r.id.listnumber); textview usernamesview = (textview)v.findviewbyid(r.id.listpostedby); commentview.settext(listcomments[position]); numbersview.settext(listnumbers[position]); usernamesview.settext(listusernames[position]); } catch(exception e) { e.printstacktrace(); } return v; } } class loadcomments extends asynctask<jsonobject, string, jsonobject> { @override protected void onpreexecute() { super.onpreexecute(); } @override protected void onprogressupdate(string... values) { super.onprogressupdate(values); } protected jsonobject doinbackground(jsonobject... params) { jsonobject json2 = collectcomments.collectcomments(usernameforcomments, offsetnumber); return json2; } @override protected void onpostexecute(jsonobject json2) { try { if (json2.getstring(key_success) != null) { registererrormsg.settext(""); string res2 = json2.getstring(key_success); if(integer.parseint(res2) == 1){ jsonarray commentarray = json2.getjsonarray(key_comment); string comments[] = new string[commentarray.length()]; ( int i=0; i<commentarray.length(); i++ ) { comments[i] = commentarray.getstring(i); } jsonarray numbersarray = json2.getjsonarray(key_number); string numbers[] = new string[numbersarray.length()]; ( int i=0; i<numbersarray.length(); i++ ) { numbers[i] = numbersarray.getstring(i); } jsonarray usernamearray = json2.getjsonarray(key_username); string usernames[] = new string[usernamearray.length()]; ( int i=0; i<usernamearray.length(); i++ ) { usernames[i] = usernamearray.getstring(i); } createcommentlists mycmlist = new createcommentlists(comments, usernames, numbers); lstcomments = (listview)findviewbyid(android.r.id.list); lstcomments.setadapter(mycmlist); }//end if key == 1 else{ // error in registration registererrormsg.settext(json2.getstring(key_error_msg)); }//end else }//end if } //end try catch (jsonexception e) { e.printstacktrace(); }//end catch } } new loadcomments().execute(); } here logcat
07-17 17:07:13.436: e/androidruntime(23880): fatal exception: main 07-17 17:07:13.436: e/androidruntime(23880): java.lang.nullpointerexception 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.listview.measurescrapchild(listview.java:1163) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.listview.measureheightofchildren(listview.java:1294) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.listview.onmeasure(listview.java:1155) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:4706) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.measurechildbeforelayout(linearlayout.java:1369) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.measurevertical(linearlayout.java:660) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.onmeasure(linearlayout.java:553) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.relativelayout.measurechild(relativelayout.java:579) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.relativelayout.onmeasure(relativelayout.java:392) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:4706) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.measurechildbeforelayout(linearlayout.java:1369) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.measurehorizontal(linearlayout.java:1017) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.onmeasure(linearlayout.java:555) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:4706) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.framelayout.onmeasure(framelayout.java:293) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.measurevertical(linearlayout.java:812) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.linearlayout.onmeasure(linearlayout.java:553) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:4706) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.framelayout.onmeasure(framelayout.java:293) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:4706) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.framelayout.onmeasure(framelayout.java:293) 07-17 17:07:13.436: e/androidruntime(23880): @ com.navdrawer.simplesidedrawer.onmeasure(simplesidedrawer.java:443) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:4706) 07-17 17:07:13.436: e/androidruntime(23880): @ android.widget.framelayout.onmeasure(framelayout.java:293) 07-17 17:07:13.436: e/androidruntime(23880): @ com.android.internal.policy.impl.phonewindow$decorview.onmeasure(phonewindow.java:2162) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.view.measure(view.java:13011) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewrootimpl.performtraversals(viewrootimpl.java:1091) 07-17 17:07:13.436: e/androidruntime(23880): @ android.view.viewrootimpl.handlemessage(viewrootimpl.java:2505) 07-17 17:07:13.436: e/androidruntime(23880): @ android.os.handler.dispatchmessage(handler.java:99) 07-17 17:07:13.436: e/androidruntime(23880): @ android.os.looper.loop(looper.java:154) 07-17 17:07:13.436: e/androidruntime(23880): @ android.app.activitythread.main(activitythread.java:4945) 07-17 17:07:13.436: e/androidruntime(23880): @ java.lang.reflect.method.invokenative(native method) 07-17 17:07:13.436: e/androidruntime(23880): @ java.lang.reflect.method.invoke(method.java:511) 07-17 17:07:13.436: e/androidruntime(23880): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:784) 07-17 17:07:13.436: e/androidruntime(23880): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:551) 07-17 17:07:13.436: e/androidruntime(23880): @ dalvik.system.nativestart.main(native method)
have checked if view v return getview() method null? catching exception catches exceptions. not helpful in opinion. what's happening here have not initiated context ctx_invitation. should in constructor. now, since ctx_invitation null, causes nullpointerexception caught catch block. , view v remains null.
change constructor createcommentlists:
public createcommentlists(string[] comments, string[] usernames, string[] numbers, dashboardactivity context) { super(); listcomments = comments; listnumbers = usernames; listusernames = numbers; ctx_invitation = context; } change following well:
createcommentlists mycmlist = new createcommentlists(comments, usernames, numbers, dashboardactivity.this); 
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