InstaMaterial source files (RecyclerView done right)

animateAdd.java

@Override
public boolean animateAdd(RecyclerView.ViewHolder viewHolder) {
    if (viewHolder.getItemViewType() == FeedAdapter.VIEW_TYPE_DEFAULT) {
        if (viewHolder.getLayoutPosition() > lastAddAnimatedItem) {
            lastAddAnimatedItem++;
            runEnterAnimation((FeedAdapter.CellFeedViewHolder) viewHolder);
            return false;
        }
    }

    dispatchAddFinished(viewHolder);
    return false;
}

animateChange.java

@Override
public boolean animateChange(@NonNull RecyclerView.ViewHolder oldHolder,
                             @NonNull RecyclerView.ViewHolder newHolder,
                             @NonNull ItemHolderInfo preInfo,
                             @NonNull ItemHolderInfo postInfo) {
    cancelCurrentAnimationIfExists(newHolder);

    if (preInfo instanceof FeedItemHolderInfo) {
        FeedItemHolderInfo feedItemHolderInfo = (FeedItemHolderInfo) preInfo;
        FeedAdapter.CellFeedViewHolder holder = (FeedAdapter.CellFeedViewHolder) newHolder;

        animateHeartButton(holder);
        updateLikesCounter(holder, holder.getFeedItem().likesCount);
        if (FeedAdapter.ACTION_LIKE_IMAGE_CLICKED.equals(feedItemHolderInfo.updateAction)) {
            animatePhotoLike(holder);
        }
    }

    return false;
}

canReuseUpdatedViewHolder.java

@Override
public boolean canReuseUpdatedViewHolder(RecyclerView.ViewHolder viewHolder) {
    return true;
}

endAnimation.java

@Override
public void endAnimation(RecyclerView.ViewHolder item) {
    super.endAnimation(item);
    cancelCurrentAnimationIfExists(item);
}

@Override
public void endAnimations() {
    super.endAnimations();
    for (AnimatorSet animatorSet : likeAnimationsMap.values()) {
        animatorSet.cancel();
    }
}

holder.java

holder.btnComments.setTag(position);
holder.btnMore.setTag(position);

interpolators.java

private static final DecelerateInterpolator DECCELERATE_INTERPOLATOR = new DecelerateInterpolator();
private static final AccelerateInterpolator ACCELERATE_INTERPOLATOR = new AccelerateInterpolator();
private static final OvershootInterpolator OVERSHOOT_INTERPOLATOR = new OvershootInterpolator(4);

private static final int ANIMATED_ITEMS_COUNT = 2;

likeAnimations.java

private final Map<RecyclerView.ViewHolder, AnimatorSet> likeAnimations = new HashMap<>();

onBindViewHolder.java

@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
    //...
    bindLoadingFeedItem(holder);
}

private void bindDefaultFeedItem(int position, CellFeedViewHolder holder) {
    //...
    updateLikesCounter(holder, false);
    updateHeartButton(holder, false);

    holder.btnComments.setTag(position);
    holder.btnMore.setTag(position);
    holder.ivFeedCenter.setTag(holder);
    holder.btnLike.setTag(holder);

    if (likeAnimations.containsKey(holder)) {
        likeAnimations.get(holder).cancel();
    }
    resetLikeAnimationState(holder);
}

onClick.java

@Override
public void onClick(View view) {
//...
    if (viewId == R.id.btnComments) {
    //...
    } else if (viewId == R.id.btnMore) {
        if (onFeedItemClickListener != null) {
            onFeedItemClickListener.onMoreClick(view, (Integer) view.getTag());
        }
    }
//...
}

recordPreLayoutInformation.java

@NonNull
@Override
public ItemHolderInfo recordPreLayoutInformation(@NonNull RecyclerView.State state,
                                                 @NonNull RecyclerView.ViewHolder viewHolder,
                                                 int changeFlags, @NonNull List<Object> payloads) {
    if (changeFlags == FLAG_CHANGED) {
        for (Object payload : payloads) {
            if (payload instanceof String) {
                return new FeedItemHolderInfo((String) payload);
            }
        }
    }

    return super.recordPreLayoutInformation(state, viewHolder, changeFlags, payloads);
}

runEnterAnimation.java

private void runEnterAnimation(View view, int position) {
    if (!animateItems || position >= ANIMATED_ITEMS_COUNT - 1) {
        return;
    }

    if (position > lastAnimatedPosition) {
        lastAnimatedPosition = position;
        view.setTranslationY(Utils.getScreenHeight(context));
        view.animate()
                .translationY(0)
                .setInterpolator(new DecelerateInterpolator(3.f))
                .setDuration(700)
                .start();
    }
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
    runEnterAnimation(viewHolder.itemView, position);
    //...
}

showLoadingView.java

private boolean showLoadingView = false;