Android adapter for a custom layout listview based on a class -

i have class looks this:

public class vizita {      public int icon;         public string titlu;         public string loc;         public string idviz;         public vizita(){             super();         }          public vizita(int icon, string titlu, string loc, string idviz) {             super();             this.icon = icon;             this.titlu = titlu;             this.loc = loc;             this.idviz = idviz;         } } 

i use asynctask retrieve json array php. works perfect simple layout of listview. want use more complex layout, designed 1 uses 4 values vizita.class above. not know how set adapter it, because way try it, gives me errors.

of course trying in onpostexecute, this:

public class myactivity extends activity { {...} jsonarray lststat; {...} public jsonarray liststatus() {     jsonarray jdata=post.getserverdatax(url_connectx);     return jdata; }     class asyncpost extends asynctask< string, string, string > { vizita weather_data[]; .... protected void onpostexecute(string result) { vizitaadapter adapter = new vizitaadapter(myactivity.this,r.layout.listview_item_row, weather_data); mylistview.setadapter(adapter);    ...} 

and in doinbackground processing json this:

lststat = liststatus(); jsonobject json_data;  try {      int length = lststat.length();      vizita weather_data[] = new vizita[length];      (int = 0; < length; i++)      {         json_data = lststat.getjsonobject(i);         weather_data[i].titlu =json_data.getstring("clientnume");         weather_data[i].idviz =json_data.getstring("idvizite");         weather_data[i].loc =json_data.getstring("localitate");      } } catch (exception e) { log.e(null, e.tostring()); }             

where liststatus() call asynctask retrieve needed jsonarray.

but receive java.lang.nullpointerexception in loop (if comment setadapter line).

i assume did not initialize weather_data array ?!?!? if (uncomment) set adapter in onpostexecute receive crash error "force close" not receive errors in ide, seeming syntaxes fine.

please tell me doing wrong? , how can fix it?

the code vizitaadapter bellow

public class vizitaadapter extends arrayadapter<vizita>{      context context;     int layoutresourceid;        vizita data[] = null;      public vizitaadapter(context context, int layoutresourceid, vizita[] data) {         super(context, layoutresourceid, data);         this.layoutresourceid = layoutresourceid;         this.context = context;         this.data = data;     }      @override     public view getview(int position, view convertview, viewgroup parent) {         view row = convertview;         weatherholder holder = null;          if(row == null)         {             layoutinflater inflater = ((activity)context).getlayoutinflater();             row = inflater.inflate(layoutresourceid, parent, false);              holder = new weatherholder();             holder.imgicon = (imageview)row.findviewbyid(r.id.imgicon);             holder.txttitle = (textview)row.findviewbyid(r.id.txttitle);             holder.txtloco = (textview)row.findviewbyid(r.id.txtlocalitate);             holder.txtidviz = (textview)row.findviewbyid(r.id.txtidvizite);              row.settag(holder);         }         else         {             holder = (weatherholder)row.gettag();         }          vizita weather = data[position];         holder.txttitle.settext(weather.titlu);         holder.txtloco.settext(weather.loc);         holder.txtidviz.settext(weather.idviz);         holder.imgicon.setimageresource(weather.icon);          return row;     }      static class weatherholder     {         imageview imgicon;         textview txttitle;         textview txtloco;         textview txtidviz;     }     }    

probably forgot initialize vizita object in loop:

json_data = lststat.getjsonobject(i); weather_data[i] = new vizita(); weather_data[i].titlu =json_data.getstring("clientnume"); weather_data[i].idviz =json_data.getstring("idvizite"); weather_data[i].loc =json_data.getstring("localitate");