recyclerview中的动画逐项查看

Question

I need to implement animations in RecyclerView which has a slide up effect for every item. I have searched for this and tried many different things. It works when you scroll but it is not working when the page loads for the first time. I have uploaded a video on this link.

I have tried this code

@Override
public void onBindViewHolder(ViewHolderHelper holder, int position, List<Object> payloads) {
    super.onBindViewHolder(holder, position, payloads);
    setAnimation(holder.itemView, position);
}

private void setAnimation(View viewToAnimate, int position) {
    if (position > lastPosition) {
        Animation animation = AnimationUtils.loadAnimation(mcontext, R.anim.slide_in_bottom_list_item);
        animation.setInterpolator(new AccelerateInterpolator());
        viewToAnimate.startAnimation(animation);
        lastPosition = position;
    }
}

Also tried

  animation.setStartOffset(position * 100);

but that is missing an item on fast scrolling

Can anyone help me ?

Answer 1

After searching on internet i decided to do a hacky solution.

 animation.setStartOffset(position * 100); 

Many post has this suggestion. But this is messing when you scroll fast in the recyclerview.

So i decided to do this offset for onlt first few visible items and then animation applies to other rows correctly without offset.

  @Override public void onBindViewHolder(ViewHolderHelper holder, int position, List<Object> payloads) { super.onBindViewHolder(holder, position, payloads); setAnimation(holder.itemView, position); } private void setAnimation(View viewToAnimate, int position) { if (position > lastPosition) { Animation animation = AnimationUtils.loadAnimation(mcontext, R.anim.slide_in_bottom_list_item); animation.setInterpolator(new DecelerateInterpolator()); if(position < 4) animation.setStartOffset(position * 200); viewToAnimate.startAnimation(animation); lastPosition = position; } } 

Hope this helps someone.