android - makeSceneTransitionAnimation between two recyclerViews working only in reverse -

in short :

creating shared element activity transition between fragment recyclerview onclick opening activity recylcerview not trigger transition.

however, using supportfinishaftertransition(); close opened activity does trigger animation correctly (it goes backwards previous activity).

also, creating shared elements outside recyclerview cause animation work @ every case (both forwards , backwards on finish) - therefore code must correct.

viewholder onclicklistener opens activity - simplified reduce useless code.

public class statsviewholder extends webstatsviewholder implements view.onclicklistener{          protected textview vtitle;         protected imageview vpicture;          public statsviewholder (view itemview) {             super(itemview);             vtitle = (textview) itemview.findviewbyid(r.id.stats_title);             vpicture = (imageview) itemview.findviewbyid(r.id.stats_picture);              vtitle.setclickable(true);             vtitle.setonclicklistener(this);         }          @override         public void onclick(view v) {             if (mitemclicklistener != null) {                 mitemclicklistener.onitemclick(v, getlayoutposition(), v.getrootview());             }         }     } 

clicking title opens new activity. - animation not trigger unless put target outside of recycler

madapter.setonitemclicklistener(new mysteamwebstatsadapter.onitemclicklistener() { @override public void onitemclick(view view, int position, view parent) { intent intent = new intent(getactivity(), details.class); activityoptions options = activityoptions.makescenetransitionanimation(getactivity(), parent.findviewbyid(r.id.stats_picture), "stats_picture"); startactivity(intent, options.tobundle()); } 

turns out i'm stupid, leaving in case makes same mistake.

in target recyclerview using picasso load drawable - time picasso needed load image time animation took , therefore didn't show up. that's reason why animation worked in reverse - image cached.

how solve issue :

wait until image loaded - called in oncreate

if (build.version.sdk_int >= build.version_codes.lollipop) {     postponeentertransition(); } 

request callback picasso when image loaded

picasso.with(this).load(mapobject.getdrawable()).transform(new circletransform()).fit().centercrop().into(detailpicture, new callback() {                 @override                 public void onsuccess() {                     schedulestartpostponedtransition(detailpicture);                 }                  @override                 public void onerror() {                  }             }); 

start animation

private void schedulestartpostponedtransition(final view sharedelement) {         sharedelement.getviewtreeobserver().addonpredrawlistener(                 new viewtreeobserver.onpredrawlistener() {                     @override                     public boolean onpredraw() {                         sharedelement.getviewtreeobserver().removeonpredrawlistener(this);                         startpostponedentertransition();                         return true;                     }                 });     }