Fragment to fragment shared element transition is not working when exit

问题

I suspect that its happening because of transition name is not set but im unable to detect that is it the reason or there is another reason or what I'm doing wrong or what is missing, here is my code:

on click of recyclerview item: i didn't set transition name in on bind view if i do it also don't work

 holder.iv.setTransitionName(MainActivity.position + "ZoomImage");

                MainActivity.position = position;

                ImagePagerFragment productDetailFragment = new ImagePagerFragment();
                productDetailFragment.setEnterTransition(R.transition.image_shared_element_transition);
                productDetailFragment.postponeEnterTransition();

                getActive.getSupportFragmentManager()
                        .beginTransaction()
                        .setReorderingAllowed(true)
                        .addSharedElement(holder.iv, holder.iv.getTransitionName())
                        .replace(R.id.fragment, productDetailFragment)
                        .addToBackStack(null)
                        .commit();

in ImagePagerFragment:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
  prepareSharedElementTransition();
  postponeEnterTransition();
}

prepareSharedElementTransition();:

 Transition transition =
    TransitionInflater.from(getContext())
        .inflateTransition(R.transition.image_shared_element_transition);
setSharedElementEnterTransition(transition);
setEnterTransition(transition);
setEnterSharedElementCallback(
    new SharedElementCallback() {
      @Override
      public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {
        Fragment currentFragment = (Fragment) viewPager.getAdapter()
            .instantiateItem(viewPager, viewPager.getCurrentItem());
        View view = currentFragment.getView();
        if (view == null) {
          return;
        }
        sharedElements.put(names.get(0), view.findViewById(R.id.image1));
      }
    });

adapter on viewpager simply returning a fragment, ImageFragment, in ImageFragment in picasso success callback:

 ivZoom.setTransitionName(MainActivity.position + "ZoomImage");
  getParentFragment().startPostponedEnterTransition();

for exit ImageFragment i have button on button click:

 close.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
          new Handler().postDelayed(new Runnable() {
              @Override
              public void run() {
                  getParentFragment().getFragmentManager().popBackStack();
                  ivZoom.getTransitionName();
              }
          }, 500);

      }
  });

and on exit transition is not working

onBind of recyclerview adapter:

  Picasso.with(context)
            .load(imageArrayList.get(position).getUrl())

// .networkPolicy(NetworkPolicy.OFFLINE)

            .placeholder(R.drawable.loading_tall)
            .fit().centerCrop()

            .into(holder.iv, new com.squareup.picasso.Callback() {
                @Override
                public void onSuccess() {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                       // holder.iv.setTransitionName(MainActivity.position + "ZoomImage");
                    }
                }

                @Override
                public void onError() {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                       // holder.iv.setTransitionName(MainActivity.position + "ZoomImage");
                    }
                }
            });

来源：https://stackoverflow.com/questions/50597274/fragment-to-fragment-shared-element-transition-is-not-working-when-exit