andremion

inline fun <reified T> Collection<*>.ofType(): Collection<T> = filter { it is T }.map { it as T }

andremion

getActivity().getWindow().getSharedElementExitTransition().addListener(new TransitionCallback() {
    @Override
    public void onTransitionEnd(Transition transition) {
        removeCallback();
    }
    private void removeCallback() {
        if (getActivity() != null) {
            getActivity().getWindow().getSharedElementExitTransition().removeListener(this);
            getActivity().setExitSharedElementCallback((SharedElementCallback) null);
        }

andremion

final MediaSharedElementCallback sharedElementCallback = new MediaSharedElementCallback();
getActivity().setExitSharedElementCallback(sharedElementCallback);
getActivity().supportPostponeEnterTransition();
mRecyclerView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
    @Override
    public boolean onPreDraw() {
        mRecyclerView.getViewTreeObserver().removeOnPreDrawListener(this);
        RecyclerView.ViewHolder holder =     mRecyclerView.findViewHolderForAdapterPosition(position);
        if (holder instanceof GalleryAdapter.MediaViewHolder) {
            GalleryAdapter.MediaViewHolder mediaViewHolder = (GalleryAdapter.MediaViewHolder) holder;

andremion

MediaSharedElementCallback sharedElementCallback = new MediaSharedElementCallback();
setEnterSharedElementCallback(sharedElementCallback);

andremion

@Override
public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {
    if (!mSharedElementViews.isEmpty()) {
        removeObsoleteElements(names, sharedElements, mapObsoleteElements(names));
        for (View sharedElementView : mSharedElementViews) {
            String transitionName = ViewCompat.getTransitionName(sharedElementView);
            names.add(transitionName);
            sharedElements.put(transitionName, sharedElementView);
        }
    }

andremion

public void setSharedElementViews(@NonNull View… sharedElementViews) {
    mSharedElementViews.clear();
    mSharedElementViews.addAll(Arrays.asList(sharedElementViews));
}

andremion

@Override
public void onMapSharedElements(List<String> names, Map<String, View> sharedElements)

andremion

@Override
public void finishAfterTransition() {
    setResult();
    super.finishAfterTransition();
}

private void setResult() {
    int position = mViewPager.getCurrentItem();
    Intent data = new Intent();
    data.putExtra(EXTRA_POSITION, position);

andremion

public void onActivityReenter(int resultCode, Intent data) {
    final int position = PreviewActivity.getPosition(resultCode, data);
    if (position != RecyclerView.NO_POSITION) {
        mRecyclerView.scrollToPosition(position);
    }
}

andremion

ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(activity, sharedElements);
ActivityCompat.startActivityForResult(activity, intent, requestCode, options.toBundle());