写一个RecyclerView相册分组的例子

好的，以下是一个简单的RecyclerView相册分组的例子：

1. 首先，在你的布局文件中添加一个RecyclerView和一个TextView用于显示分组标题：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layoutManager="LinearLayoutManager"/>

<TextView
    android:id="@+id/group_title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:textSize="18sp"
    android:textAppearance="@style/TextAppearance.AppCompat.Headline"/>

2. 然后，创建一个相册数据模型类Album：

public class Album {
    private String title;
    private List<Photo> photos;

    public Album(String title, List<Photo> photos) {
        this.title = title;
        this.photos = photos;
    }

    public String getTitle() {
        return title;
    }

    public List<Photo> getPhotos() {
        return photos;
    }
}

3. 接下来，创建一个照片数据模型类Photo：

public class Photo {
    private String title;
    private int imageRes;

    public Photo(String title, int imageRes) {
        this.title = title;
        this.imageRes = imageRes;
    }

    public String getTitle() {
        return title;
    }

    public int getImageRes() {
        return imageRes;
    }
}

4. 然后，创建一个RecyclerView的Adapter类AlbumAdapter：

public class AlbumAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private List<Album> albums;

    public AlbumAdapter(List<Album> albums) {
        this.albums = albums;
    }

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

    @Override
    public int getItemViewType(int position) {
        return position;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_album, parent, false);
        return new AlbumViewHolder(view);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        AlbumViewHolder albumViewHolder = (AlbumViewHolder) holder;
        Album album = albums.get(position);
        albumViewHolder.title.setText(album.getTitle());
        albumViewHolder.photoAdapter.setPhotos(album.getPhotos());
    }

    private class AlbumViewHolder extends RecyclerView.ViewHolder {
        private TextView title;
        private RecyclerView photoRecyclerView;
        private PhotoAdapter photoAdapter;

        public AlbumViewHolder(View itemView) {
            super(itemView);
            title = itemView.findViewById(R.id.title);
            photoRecyclerView = itemView.findViewById(R.id.photo_recycler_view);
            photoRecyclerView.setLayoutManager(new GridLayoutManager(itemView.getContext(), 3));
            photoAdapter = new PhotoAdapter();
            photoRecyclerView.setAdapter(photoAdapter);
        }
    }

    private class PhotoAdapter extends RecyclerView.Adapter<PhotoViewHolder> {
        private List<Photo> photos = new ArrayList<>();

        public void setPhotos(List<Photo> photos) {
            this.photos = photos;
            notifyDataSetChanged();
        }

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

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

        @Override
        public void onBindViewHolder(PhotoViewHolder holder, int position) {
            Photo photo = photos.get(position);
            holder.title.setText(photo.getTitle());
            holder.image.setImageResource(photo.getImageRes());
        }
    }

    private class PhotoViewHolder extends RecyclerView.ViewHolder {
        private TextView title;
        private ImageView image;

        public PhotoViewHolder(View itemView) {
            super(itemView);
            title = itemView.findViewById(R.id.title);
            image = itemView.findViewById(R.id.image);
        }
    }
}

5. 最后，在你的Activity或Fragment中设置RecyclerView的Adapter：

List<Album> albums = new ArrayList<>();
// 初始化相册数据
AlbumAdapter adapter = new AlbumAdapter(albums);
recyclerView.setAdapter(adapter);

这样，你就可以创建一个简单的RecyclerView相册分组了。