Android Dragging Custom ListView -

i'm trying implement google example (https://www.youtube.com/watch?v=_bzivjmgh-q), custom object.

almost ok, items in listview doesn't change position

could explain missed in code?

mainactivity:  @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_list_view);          arraylist<product> prodarray = new arraylist<product>();         for(int = 0; < cheeses.scheesestrings.length; ++i) {             prodarray.add(new product(cheeses.scheesestrings[i],r.drawable.ic_launcher));         }           stablearrayadapter adapter = new stablearrayadapter(this, r.layout.text_view, prodarray);         dynamiclistview listview = (dynamiclistview) findviewbyid(r.id.listview);          listview.setcheeselist(prodarray);         listview.setadapter(adapter);         listview.setchoicemode(listview.choice_mode_single);      } 

adapter:

package com.example.android.listviewdragginganimation;  public class stablearrayadapter extends arrayadapter<product> {      final int invalid_id = -1;     layoutinflater linflater;      arraylist<product> prodarray = new arraylist<product>();      public stablearrayadapter(context context, int textviewresourceid, list<product> objects) {         super(context, textviewresourceid, objects);          linflater = (layoutinflater) context                 .getsystemservice(context.layout_inflater_service);          (int = 0; < objects.size(); ++i) {             prodarray.add(objects.get(i));         }      }      // пункт списка     @override     public view getview(int position, view convertview, viewgroup parent) {         // используем созданные, но не используемые view         view view = convertview;         if (view == null) {             view = linflater.inflate(r.layout.item, parent, false);         }          product p = getproduct(position);         final int pos = position;         final string name = p.prodname;           ((textview) view.findviewbyid(r.id.tvdescr)).settext(p.prodname);         ((imageview) view.findviewbyid(r.id.ivimage)).setimageresource(p.prodimage);          return view;     }      // товар по позиции     product getproduct(int position) {         return ((product) getitem(position));     }       @override     public product getitem(int position) {         return prodarray.get(position);     }      @override     public long getitemid(int position) {          if (position < 0 || position >= prodarray.size()) {             return invalid_id;         }          return position;     }       @override     public boolean hasstableids() {         return true;     }  } 

listviewanimation:

package com.example.android.listviewdragginganimation;   import java.util.arraylist;  public class dynamiclistview extends listview {      private final int smooth_scroll_amount_at_edge = 15;     private final int move_duration = 150;     private final int line_thickness = 15;      public arraylist<string> mcheeselist;     public arraylist<product> prod;      private int mlasteventy = -1;      private int mdowny = -1;     private int mdownx = -1;      private int mtotaloffset = 0;      private boolean mcellismobile = false;     private boolean mismobilescrolling = false;     private int msmoothscrollamountatedge = 0;      private final int invalid_id = -1;     private long maboveitemid = invalid_id;     private long mmobileitemid = invalid_id;     private long mbelowitemid = invalid_id;      private bitmapdrawable mhovercell;     private rect mhovercellcurrentbounds;     private rect mhovercelloriginalbounds;      private final int invalid_pointer_id = -1;     private int mactivepointerid = invalid_pointer_id;      private boolean miswaitingforscrollfinish = false;     private int mscrollstate = onscrolllistener.scroll_state_idle;      public dynamiclistview(context context) {         super(context);         init(context);     }      public dynamiclistview(context context, attributeset attrs, int defstyle) {         super(context, attrs, defstyle);         init(context);     }      public dynamiclistview(context context, attributeset attrs) {         super(context, attrs);         init(context);     }      public void init(context context) {         setonitemlongclicklistener(monitemlongclicklistener);         setonscrolllistener(mscrolllistener);         displaymetrics metrics = context.getresources().getdisplaymetrics();         msmoothscrollamountatedge = (int)(smooth_scroll_amount_at_edge / metrics.density);     }      private onitemlongclicklistener monitemlongclicklistener =             new onitemlongclicklistener() {                 public boolean onitemlongclick(adapterview<?> arg0, view arg1, int pos, long id)                {                               mtotaloffset = 0;                      int position = pointtoposition(mdownx, mdowny);                     int itemnum = position - getfirstvisibleposition();                      view selectedview = getchildat(itemnum);                     mmobileitemid = getadapter().getitemid(position);                     mhovercell = getandaddhoverview(selectedview);                     selectedview.setvisibility(invisible);                      mcellismobile = true;                      updateneighborviewsforid(mmobileitemid);                      return true;                 }             };      private bitmapdrawable getandaddhoverview(view v) {          int w = v.getwidth();         int h = v.getheight();         int top = v.gettop();         int left = v.getleft();          bitmap b = getbitmapwithborder(v);          bitmapdrawable drawable = new bitmapdrawable(getresources(), b);          mhovercelloriginalbounds = new rect(left, top, left + w, top + h);         mhovercellcurrentbounds = new rect(mhovercelloriginalbounds);          drawable.setbounds(mhovercellcurrentbounds);          return drawable;     }      /** draws black border on screenshot of view passed in. */     private bitmap getbitmapwithborder(view v) {         bitmap bitmap = getbitmapfromview(v);         canvas can = new canvas(bitmap);          rect rect = new rect(0, 0, bitmap.getwidth(), bitmap.getheight());          paint paint = new paint();         paint.setstyle(paint.style.stroke);         paint.setstrokewidth(line_thickness);         paint.setcolor(color.black);          can.drawbitmap(bitmap, 0, 0, null);         can.drawrect(rect, paint);          return bitmap;     }      /** returns bitmap showing screenshot of view passed in. */     private bitmap getbitmapfromview(view v) {         bitmap bitmap = bitmap.createbitmap(v.getwidth(), v.getheight(), bitmap.config.argb_8888);         canvas canvas = new canvas (bitmap);         v.draw(canvas);         return bitmap;     }      private void updateneighborviewsforid(long itemid) {         int position = getpositionforid(itemid);         stablearrayadapter adapter = ((stablearrayadapter)getadapter());         maboveitemid = adapter.getitemid(position - 1);         mbelowitemid = adapter.getitemid(position + 1);     }      /** retrieves view in list corresponding itemid */     public view getviewforid (long itemid) {         int firstvisibleposition = getfirstvisibleposition();         stablearrayadapter adapter = ((stablearrayadapter)getadapter());         for(int = 0; < getchildcount(); i++) {             view v = getchildat(i);             int position = firstvisibleposition + i;             long id = adapter.getitemid(position);             if (id == itemid) {                 return v;             }         }         return null;     }      /** retrieves position in list corresponding itemid */     public int getpositionforid (long itemid) {         view v = getviewforid(itemid);         if (v == null) {             return -1;         } else {             return getpositionforview(v);         }     }      @override     protected void dispatchdraw(canvas canvas) {         super.dispatchdraw(canvas);         if (mhovercell != null) {             mhovercell.draw(canvas);         }     }      @override     public boolean ontouchevent (motionevent event) {          switch (event.getaction() & motionevent.action_mask) {             case motionevent.action_down:                 mdownx = (int)event.getx();                 mdowny = (int)event.gety();                 mactivepointerid = event.getpointerid(0);                 break;             case motionevent.action_move:                 if (mactivepointerid == invalid_pointer_id) {                     break;                 }                  int pointerindex = event.findpointerindex(mactivepointerid);                  mlasteventy = (int) event.gety(pointerindex);                 int deltay = mlasteventy - mdowny;                  if (mcellismobile) {                     mhovercellcurrentbounds.offsetto(mhovercelloriginalbounds.left,                             mhovercelloriginalbounds.top + deltay + mtotaloffset);                     mhovercell.setbounds(mhovercellcurrentbounds);                     invalidate();                      handlecellswitch();                      mismobilescrolling = false;                     handlemobilecellscroll();                      return false;                 }                 break;             case motionevent.action_up:                 toucheventsended();                 break;             case motionevent.action_cancel:                 toucheventscancelled();                 break;             case motionevent.action_pointer_up:                 /* if multitouch event took place , original touch dictating                  * movement of hover cell has ended, dragging event                  * ends , hover cell animated corresponding position                  * in listview. */                 pointerindex = (event.getaction() & motionevent.action_pointer_index_mask) >>                         motionevent.action_pointer_index_shift;                 final int pointerid = event.getpointerid(pointerindex);                 if (pointerid == mactivepointerid) {                     toucheventsended();                 }                 break;             default:                 break;         }          return super.ontouchevent(event);     }       private void handlecellswitch() {         final int deltay = mlasteventy - mdowny;         int deltaytotal = mhovercelloriginalbounds.top + mtotaloffset + deltay;          view belowview = getviewforid(mbelowitemid);         view mobileview = getviewforid(mmobileitemid);         view aboveview = getviewforid(maboveitemid);          boolean isbelow = (belowview != null) && (deltaytotal > belowview.gettop());         boolean isabove = (aboveview != null) && (deltaytotal < aboveview.gettop());          if (isbelow || isabove) {              final long switchitemid = isbelow ? mbelowitemid : maboveitemid;             view switchview = isbelow ? belowview : aboveview;             final int originalitem = getpositionforview(mobileview);              if (switchview == null) {                 updateneighborviewsforid(mmobileitemid);                 return;             }              //swapelements(mcheeselist, originalitem, getpositionforview(switchview));             swapelements(prod, originalitem, getpositionforid(switchitemid));              ((baseadapter) getadapter()).notifydatasetchanged();              mdowny = mlasteventy;              final int switchviewstarttop = switchview.gettop();              mobileview.setvisibility(view.visible);             switchview.setvisibility(view.invisible);              updateneighborviewsforid(mmobileitemid);              final viewtreeobserver observer = getviewtreeobserver();             observer.addonpredrawlistener(new viewtreeobserver.onpredrawlistener() {                 public boolean onpredraw() {                     observer.removeonpredrawlistener(this);                      view switchview = getviewforid(switchitemid);                      mtotaloffset += deltay;                      int switchviewnewtop = switchview.gettop();                     int delta = switchviewstarttop - switchviewnewtop;                      switchview.settranslationy(delta);                      objectanimator animator = objectanimator.offloat(switchview,                             view.translation_y, 0);                     animator.setduration(move_duration);                     animator.start();                      return true;                 }             });         }     }      private void swapelements(arraylist arraylist, int indexone, int indextwo) {         object temp = arraylist.get(indexone);         arraylist.set(indexone, arraylist.get(indextwo));         arraylist.set(indextwo, temp);     }       private void toucheventsended () {         final view mobileview = getviewforid(mmobileitemid);         if (mcellismobile|| miswaitingforscrollfinish) {             mcellismobile = false;             miswaitingforscrollfinish = false;             mismobilescrolling = false;             mactivepointerid = invalid_pointer_id;               if (mscrollstate != onscrolllistener.scroll_state_idle) {                 miswaitingforscrollfinish = true;                 return;             }              mhovercellcurrentbounds.offsetto(mhovercelloriginalbounds.left, mobileview.gettop());              objectanimator hoverviewanimator = objectanimator.ofobject(mhovercell, "bounds",                     sboundevaluator, mhovercellcurrentbounds);             hoverviewanimator.addupdatelistener(new valueanimator.animatorupdatelistener() {                 @override                 public void onanimationupdate(valueanimator valueanimator) {                     invalidate();                 }             });             hoverviewanimator.addlistener(new animatorlisteneradapter() {                 @override                 public void onanimationstart(animator animation) {                     setenabled(false);                 }                  @override                 public void onanimationend(animator animation) {                     maboveitemid = invalid_id;                     mmobileitemid = invalid_id;                     mbelowitemid = invalid_id;                     mobileview.setvisibility(visible);                     mhovercell = null;                     setenabled(true);                     invalidate();                 }             });             hoverviewanimator.start();         } else {             toucheventscancelled();         }     }       private void toucheventscancelled () {         view mobileview = getviewforid(mmobileitemid);         if (mcellismobile) {             maboveitemid = invalid_id;             mmobileitemid = invalid_id;             mbelowitemid = invalid_id;             mobileview.setvisibility(visible);             mhovercell = null;             invalidate();         }         mcellismobile = false;         mismobilescrolling = false;         mactivepointerid = invalid_pointer_id;     }       private final static typeevaluator<rect> sboundevaluator = new typeevaluator<rect>() {         public rect evaluate(float fraction, rect startvalue, rect endvalue) {             return new rect(interpolate(startvalue.left, endvalue.left, fraction),                     interpolate(startvalue.top, endvalue.top, fraction),                     interpolate(startvalue.right, endvalue.right, fraction),                     interpolate(startvalue.bottom, endvalue.bottom, fraction));         }          public int interpolate(int start, int end, float fraction) {             return (int)(start + fraction * (end - start));         }     };       private void handlemobilecellscroll() {         mismobilescrolling = handlemobilecellscroll(mhovercellcurrentbounds);     }       public boolean handlemobilecellscroll(rect r) {         int offset = computeverticalscrolloffset();         int height = getheight();         int extent = computeverticalscrollextent();         int range = computeverticalscrollrange();         int hoverviewtop = r.top;         int hoverheight = r.height();          if (hoverviewtop <= 0 && offset > 0) {             smoothscrollby(-msmoothscrollamountatedge, 0);             return true;         }          if (hoverviewtop + hoverheight >= height && (offset + extent) < range) {             smoothscrollby(msmoothscrollamountatedge, 0);             return true;         }          return false;     }       public void setcheeselist(arraylist<product> cheeselist) {         prod = cheeselist;     }       private onscrolllistener mscrolllistener = new onscrolllistener () {          private int mpreviousfirstvisibleitem = -1;         private int mpreviousvisibleitemcount = -1;         private int mcurrentfirstvisibleitem;         private int mcurrentvisibleitemcount;         private int mcurrentscrollstate;          public void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount,                              int totalitemcount) {             mcurrentfirstvisibleitem = firstvisibleitem;             mcurrentvisibleitemcount = visibleitemcount;              mpreviousfirstvisibleitem = (mpreviousfirstvisibleitem == -1) ? mcurrentfirstvisibleitem                     : mpreviousfirstvisibleitem;             mpreviousvisibleitemcount = (mpreviousvisibleitemcount == -1) ? mcurrentvisibleitemcount                     : mpreviousvisibleitemcount;              checkandhandlefirstvisiblecellchange();             checkandhandlelastvisiblecellchange();              mpreviousfirstvisibleitem = mcurrentfirstvisibleitem;             mpreviousvisibleitemcount = mcurrentvisibleitemcount;         }          @override         public void onscrollstatechanged(abslistview view, int scrollstate) {             mcurrentscrollstate = scrollstate;             mscrollstate = scrollstate;             isscrollcompleted();         }           private void isscrollcompleted() {             if (mcurrentvisibleitemcount > 0 && mcurrentscrollstate == scroll_state_idle) {                 if (mcellismobile && mismobilescrolling) {                     handlemobilecellscroll();                 } else if (miswaitingforscrollfinish) {                     toucheventsended();                 }             }         }           public void checkandhandlefirstvisiblecellchange() {             if (mcurrentfirstvisibleitem != mpreviousfirstvisibleitem) {                 if (mcellismobile && mmobileitemid != invalid_id) {                     updateneighborviewsforid(mmobileitemid);                     handlecellswitch();                 }             }         }           public void checkandhandlelastvisiblecellchange() {             int currentlastvisibleitem = mcurrentfirstvisibleitem + mcurrentvisibleitemcount;             int previouslastvisibleitem = mpreviousfirstvisibleitem + mpreviousvisibleitemcount;             if (currentlastvisibleitem != previouslastvisibleitem) {                 if (mcellismobile && mmobileitemid != invalid_id) {                     updateneighborviewsforid(mmobileitemid);                     handlecellswitch();                 }             }         }     }; } 

thx in advance!

problem solved in way: i've sent custom object adapter , build view custom object.