Android recyclerview, databinding and sub view animation -

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could me find proper way without leak animate recylcerview's item's sub item?

i want create 2 level drawer menu, menu items in recyclerview created adapter. of menu items contain sub items, , items can open arrow @ end add sub items list below parent item. want animate arrows rotate 180 degree when adapter detects parent item have open/close , show/remove sub items.

the whole thing working i'm not happy solution of animation. :(

what tricky part i'm using databinding fill item's data.

here's class contains data:

public class menuitem extends baseobservable {      public observablefield<string> name = new observablefield<>();     public observableboolean selected = new observableboolean(false);     public observableboolean issubitem = new observableboolean(false);     public menuitem parent;     public list<menuitem> subitems = new arraylist<>(0);     private draweradapter.ondraweritemclicklistener listener;     /* it's potencial leak */     public view arrow;      .....     public void animatearrow(boolean isopen) {         if(arrow == null)            return;          float degrees = isopen ? 180f : 0f;         arrow.animate().roatate(degrees).setduration(300).start();     }  }

here's viewholder:

public class draweritemholder extends recyclerview.viewholder {      public draweritembinder ui;      public draweritemholder(view itemview) {         super(itemview);         ui = databindingutil.bind(itemview);     } }

here's how bind viewholder:

@override public void onbindviewholder(draweritemholder holder, int position) {     menuitem item = items.get(position);     if(!item.subitems.isempty())         item.arrow = holder.ui.arrow;     holder.ui.setdata(item); }

i attach arrow view items has sub item.

and when adapter decides open item calls method:

private void opencategories(menuitem item) {     ...      /* animate close state opened category's arrow */     if(openedcategory != null)         openedcategory.animateopener(false);      openedcategory = item;      /* animate opened state newly opened category */     openedcategory.animateopener(true);      notifyitemrangeinserted(...); }

the openedcategory menuitem, reference parent item open.

and when want close item calls this:

private void closecategories() {     if (openedcategory == null)         return;     ...     notifyitemrangeremoved(...);       /* animate closed state opened category's arrow */     openedcategory.animateopener(false);     openedcategory = null; }

so problem this. how can animate subview of parent items without leaking arrow views holding reference them in menuitem class?

best regards!


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