未使用DiffUtil调用getItemCount或onBindViewHolder

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private AsyncListDiffer<Item> mDiffer = new AsyncListDiffer<>(this, new ItemDiffCallback());

    public void submitList(List<Item> newList) {
        mDiffer.submitList(newList);
    }

    @Override
    public int getItemCount() {
        return mDiffer.getCurrentList().size();
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Item item = mDiffer.getCurrentList().get(position);
        // 绑定数据到视图
    }

    static class ViewHolder extends RecyclerView.ViewHolder {
        // 定义视图持有者
    }

    static class ItemDiffCallback extends DiffUtil.Callback {
        private List<Item> oldList;
        private List<Item> newList;

        public ItemDiffCallback(List<Item> oldList, List<Item> newList) {
            this.oldList = oldList;
            this.newList = newList;
        }

        @Override
        public int getOldListSize() {
            return oldList.size();
        }

        @Override
        public int getNewListSize() {
            return newList.size();
        }

        @Override
        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
            return oldList.get(oldItemPosition).getId().equals(newList.get(newItemPosition).getId());
        }

        @Override
        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
            return oldList.get(oldItemPosition).equals(newList.get(newItemPosition));
        }
    }
}