java - Android - How to put a item click in ListView with Hashmap and List -

in app, use asynctask named getimagetask image url int given user.

example : url = "http://example.com/image.php?index=" + int

i put image in imageview , in "doinbackground", create 2 hashmap add element in 2 list.

the first display list of index in listview when click in button "onclickindex".

the second 1 save image index given because want element of listview image when user click on (onclickindex).

but i'm blocked on part because can't bitmap in second list index , don't know ?

mainactivity.java

public class mainactivity extends actionbaractivity { private edittext mynumber; private imageview myimage; private listview myindexlist; private arraylist<hashmap<string,string>> list = new arraylist<>(); private arraylist<hashmap<integer,bitmap>> list2 = new arraylist<>();  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     mynumber = (edittext)findviewbyid(r.id.choiceofindex);     myimage = (imageview)findviewbyid(r.id.imagerecup);     myindexlist = (listview)findviewbyid(r.id.listindex);  }  class getimagetask extends asynctask<integer,integer,bitmap> {      protected bitmap doinbackground(integer... index) {         hashmap<string,string> hashmap = new hashmap<>();         hashmap<integer,bitmap> hashmap2 = new hashmap<>();         integer choix = index[0];         string urldisplay = "http://example.com/image.php?index=" + choix;         bitmap recupimage = null;         try {             inputstream in = new java.net.url(urldisplay).openstream();             recupimage = bitmapfactory.decodestream(in);         }         catch (exception e){             log.e("error", e.getmessage());             e.printstacktrace();         }         hashmap.put("index","index " +choix);         hashmap2.put(choix,recupimage);         list.add(hashmap);         list2.add(hashmap2);         return recupimage;     }      protected void onprogressupdate(integer... progress)     {         context context = getapplicationcontext();         super.onprogressupdate(progress);         toast.maketext(context, "wait...", toast.length_long).show();      }      protected void onpostexecute(bitmap result)     {         context context = getapplicationcontext();         super.onpostexecute(result);         myimage.setimagebitmap(result);         toast.maketext(context, "image!!", toast.length_long).show();     } }   public void onclickrecup(view v) {     try{         int index= integer.parseint(mynumber.gettext().tostring());         getimagetask getimage = new getimagetask();         getimage.execute(index);     }     catch (numberformatexception nfe) {         context context = getapplicationcontext();         toast.maketext(context, "no image!", toast.length_long).show();     } }   public void onclickindex(view v) {     try {         simpleadapter adapter = new simpleadapter(this,list,r.layout.row, new string[]{"index"},                 new int[] {r.id.index});         myindexlist.setadapter(adapter);         myindexlist.setonitemclicklistener(new adapterview.onitemclicklistener() {             @override             public void onitemclick(adapterview<?> parent, view view, int position, long id) {                 bitmap imageback = list2.get(position).get(r.id.index);                 myimage.setimagebitmap(imageback);             }         });     }     catch (exception e){         context context = getapplicationcontext();         toast.maketext(context, "problem on listview", toast.length_long).show();     }    }     } 

sorry didn't sooner busy.

don't use hashmap store bitmaps. it's on complicating things.

arraylist<bitmap> list2 = new arraylist<>(); 

then change line..

bitmap imageback = list2.get(position).get(r.id.index); 

to this

bitmap imageback = list2.get(position); 

the reason why wrote didn't work don't store images on key: r.id.index

integer choix = index[0]; ... hashmap2.put(choix,recupimage); 

r.id.index integer generated r before app run uniquely identifies label. why wouldn't accept before (as far can tell)