java - .execute cannot be resolved to a type - AsyncTask (Android) -

im writing app needs json db, receive data, im trying view icon beside information shown in listview.

the line making trouble is:

mchart.settag(url); new downloadimagestask.execute(mchart); <------ 

mainactivity:

public class mainactivity extends activity {    listview list;   textview icon;   textview name;   textview developer;   textview size;    button btngetdata;    arraylist<hashmap<string, string>> mlist = new arraylist<hashmap<string, string>>();    private static string url = "http://appwhittle.com/getdata.php";    private static final string tag_item = "app_item";   private static final string tag_icon = "app_icon";   private static final string tag_name = "app_name";   private static final string tag_developer = "app_developer";   private static final string tag_size = "app_size";    jsonarray mjsonarray = null;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         mlist = new arraylist<hashmap<string, string>>();          new jsonparse().execute();     }      private class jsonparse extends asynctask<string, string, jsonobject> {        private progressdialog pdialog;       @override         protected void onpreexecute() {             super.onpreexecute();              icon = (textview)findviewbyid(r.id.icon);             name = (textview)findviewbyid(r.id.name);             size = (textview)findviewbyid(r.id.size);             developer = (textview)findviewbyid(r.id.developer);              pdialog = new progressdialog(mainactivity.this);             pdialog.setmessage("getting data ...");             pdialog.setindeterminate(false);             pdialog.setcancelable(true);             pdialog.show();       }        @override         protected jsonobject doinbackground(string... args) {         jsonparser jparser = new jsonparser();         // getting json url         jsonobject json = jparser.getjsonfromurl(url);          return json;       }        @override          protected void onpostexecute(jsonobject json) {          pdialog.dismiss();          try {             mjsonarray = json.getjsonarray(tag_item);             for(int = 0; < mjsonarray.length(); i++){             jsonobject c = mjsonarray.getjsonobject(i);              string name = c.getstring(tag_name);             string size = c.getstring(tag_size);             string developer = c.getstring(tag_developer);             string icon = c.getstring(tag_icon);              hashmap<string, string> map = new hashmap<string, string>();             map.put(tag_icon, icon);             map.put(tag_name, name);             map.put(tag_developer, "developer: " + developer);             map.put(tag_size, size + " mb");                               mlist.add(map);             list=(listview)findviewbyid(r.id.list);              listadapter adapter = new simpleadapter(mainactivity.this, mlist,                 r.layout.list_v,                 new string[] {tag_name, tag_developer, tag_size }, new int[] {                     r.id.name, r.id.developer, r.id.size});              imageview mchart = (imageview) findviewbyid(r.id.icon);             string url = "http://www...anything ...";              mchart.settag(url);             new downloadimagestask.execute(mchart);              list.setadapter(adapter);             list.setonitemclicklistener(new adapterview.onitemclicklistener() {                     @override                     public void onitemclick(adapterview<?> parent, view view,                                             int position, long id) {                         toast.maketext(mainactivity.this, "you clicked @ "+ mlist.get(+position).get(tag_name), toast.length_short).show();                     }                 });             }         } catch (jsonexception e) {           e.printstacktrace();         }        }     }         } 

downloadimagestask:

public class downloadimagestask extends asynctask<imageview, void, bitmap> {      imageview imageview = null;      @override     protected bitmap doinbackground(imageview... imageviews) {         this.imageview = imageviews[0];         return download_image((string)imageview.gettag());     }      @override     protected void onpostexecute(bitmap result) {         imageview.setimagebitmap(result);     }       private bitmap download_image(string url) {         return null;         }     } 

any appreciated! in advance!

replace

new downloadimagestask.execute(mchart);  

with

new downloadimagestask().execute(mchart);  

try this. work.