android使用RecyclerView的DiffUtil实现对U盘中图片的加载和逐步显示代码

我可以回答这个问题。使用RecyclerView的DiffUtil可以实现对U盘中图片的加载和逐步显示。以下是示例代码：

public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ImageViewHolder> {
    private List<File> mImages;

    public ImageAdapter(List<File> images) {
        mImages = images;
    }

    @NonNull
    @Override
    public ImageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_image, parent, false);
        return new ImageViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ImageViewHolder holder, int position) {
        holder.bind(mImages.get(position));
    }

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

    public void updateImages(List<File> newImages) {
        DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(new ImageDiffCallback(mImages, newImages));
        mImages.clear();
        mImages.addAll(newImages);
        diffResult.dispatchUpdatesTo(this);
    }

    static class ImageViewHolder extends RecyclerView.ViewHolder {
        private ImageView mImageView;

        public ImageViewHolder(@NonNull View itemView) {
            super(itemView);
            mImageView = itemView.findViewById(R.id.image_view);
        }

        public void bind(File imageFile) {
            Glide.with(itemView.getContext())
                    .load(imageFile)
                    .into(mImageView);
        }
    }

    static class ImageDiffCallback extends DiffUtil.Callback {
        private List<File> mOldImages;
        private List<File> mNewImages;

        public ImageDiffCallback(List<File> oldImages, List<File> newImages) {
            mOldImages = oldImages;
            mNewImages = newImages;
        }

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

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

        @Override
        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
            return mOldImages.get(oldItemPosition).equals(mNewImages.get(newItemPosition));
        }

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