java - Output JSON image in listView -

i tried uploading image using json. create link image in json. many times tried fix problem, no success.

is there mistake in use of downloadimagetask in adapter adapter ?

mainactivity

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      list = (listview) findviewbyid(r.id.list);     newslist = new arraylist<news>();      //this take json image     new newsasynktask().execute(); }  public class newsasynktask extends asynctask<string , void, string> {     protected string doinbackground(string... params) {         //code     }      protected void onpostexecute(string file_url) {         pdialog.dismiss();      //this run adapter         newsadapter adapter = new newsadapter(getapplicationcontext(), r.layout.list_row, newslist);         list.setadapter(adapter);     } } 

my adapter adapter

public class newsadapter extends arrayadapter<news> {     arraylist<news> arraylistnews;     int resourse;     context context;     layoutinflater vi;      public newsadapter(context context, int resource, arraylist<news> objects) {         super(context, resource, objects);          arraylistnews = objects;         resourse = resource;         this.context = context;          vi = (layoutinflater) context.getsystemservice(context.layout_inflater_service);     }      @override     public view getview(int position, view convertview, viewgroup parent) {          viewholder holder;         if (convertview == null) {             convertview = vi.inflate(resourse, null);             holder = new viewholder();              holder.imageview = (imageview) convertview.findviewbyid(r.id.imagenews);             holder.namenews = (textview) convertview.findviewbyid(r.id.namenews);             holder.daynews = (textview) convertview.findviewbyid(r.id.daynews);              convertview.settag(holder);         } else {             holder = (viewholder) convertview.gettag();         }          new downloadimagetask(holder.imageview).execute(arraylistnews.get(position).getimagenews());         holder.namenews.settext(arraylistnews.get(position).getnamenews());         holder.daynews.settext(arraylistnews.get(position).getdaynews());          return convertview;     }      static class viewholder {         public imageview imageview;         public textview namenews;         public textview daynews;     }      //this try load image. using wrong somthing, please me     private class downloadimagetask extends asynctask<string, void, bitmap> {         imageview bmimage;          imageloader imgloader;          public downloadimagetask(imageview bmimage) {             this.bmimage = bmimage;         }          @override         protected bitmap doinbackground(string... urls) {             final string urldisplay = urls[0];             bitmap micon11 = null;             try {                   handler handler = new handler(context.getmainlooper());                 handler.post(new runnable() {                     @override                     public void run() {                         //this class on [link][1]. try use simple, work. here dont work                         imgloader = new imageloader(context);                         imgloader.displayimage(urldisplay, bmimage);                     }                 });              } catch (exception e) {                 e.printstacktrace();             }             return micon11;         }          protected void onpostexecute(bitmap result) {             bmimage.setimagebitmap(result);         }     } }