给RecycleView item 加动画时注意的问题

在给item加上动画之后，慢速滑动的时候是没有问题的，但要快速滑动就会出现卡屏现象。

public abstract class BaseAnimAdapter extends BaseAdapter {
    private int lastPosition = -1;

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        setAnimation(holder.itemView, position);
    }

    protected void setAnimation(View viewToAnimate, int position) {
        if (position > lastPosition) {
            Animation animation = AnimationUtils.loadAnimation(viewToAnimate.getContext(), R.anim.item_slide_bottom_up);
            viewToAnimate.startAnimation(animation);
            lastPosition = position;
        }
    }

问题就出在动画设置完之后，没有及时清除动画，添加以下代码即可：

public abstract class BaseAnimAdapter extends BaseAdapter {
    private int lastPosition = -1;

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        setAnimation(holder.itemView, position);
    }

    protected void setAnimation(View viewToAnimate, int position) {
        if (position > lastPosition) {
            Animation animation = AnimationUtils.loadAnimation(viewToAnimate.getContext(), R.anim.item_slide_bottom_up);
            viewToAnimate.startAnimation(animation);
            lastPosition = position;
        }
    }

    @Override
    public void onViewDetachedFromWindow(RecyclerView.ViewHolder holder) {
        super.onViewDetachedFromWindow(holder);
        holder.itemView.clearAnimation();
    }
}