zhibo/android-app/app/src/main/java/com/example/livestreaming/WaterfallRoomsAdapter.java

package com.example.livestreaming;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.ListAdapter;
import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.resource.bitmap.RoundedCorners;
import com.bumptech.glide.request.RequestOptions;
import com.example.livestreaming.net.Room;

import java.util.Random;

public class WaterfallRoomsAdapter extends ListAdapter<Room, WaterfallRoomsAdapter.RoomVH> {

    public interface OnRoomClickListener {
        void onRoomClick(Room room);
    }

    private final OnRoomClickListener onRoomClick;
    
    // 预定义的图片高度比例，模拟瀑布流效果
    private static final float[] HEIGHT_RATIOS = {1.0f, 1.2f, 0.9f, 1.3f, 1.1f, 0.85f, 1.15f, 1.25f};

    public WaterfallRoomsAdapter(OnRoomClickListener onRoomClick) {
        super(DIFF);
        this.onRoomClick = onRoomClick;
    }

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

    @Override
    public void onBindViewHolder(@NonNull RoomVH holder, int position) {
        holder.bind(getItem(position), position);
    }

    static class RoomVH extends RecyclerView.ViewHolder {

        private final ImageView coverImage;
        private final TextView liveBadge;
        private final LinearLayout viewerCountLayout;
        private final TextView viewerCount;
        private final TextView roomTitle;
        private final ImageView streamerAvatar;
        private final TextView streamerName;
        private final ImageView likeIcon;
        private final TextView likeCount;
        private final TextView hotBadge;
        private final ImageView playIcon;
        private final OnRoomClickListener onRoomClick;

        RoomVH(View itemView, OnRoomClickListener onRoomClick) {
            super(itemView);
            this.onRoomClick = onRoomClick;
            
            coverImage = itemView.findViewById(R.id.coverImage);
            liveBadge = itemView.findViewById(R.id.liveBadge);
            viewerCountLayout = itemView.findViewById(R.id.viewerCountLayout);
            viewerCount = itemView.findViewById(R.id.viewerCount);
            roomTitle = itemView.findViewById(R.id.roomTitle);
            streamerAvatar = itemView.findViewById(R.id.streamerAvatar);
            streamerName = itemView.findViewById(R.id.streamerName);
            likeIcon = itemView.findViewById(R.id.likeIcon);
            likeCount = itemView.findViewById(R.id.likeCount);
            hotBadge = itemView.findViewById(R.id.hotBadge);
            playIcon = itemView.findViewById(R.id.playIcon);
        }

        void bind(Room room, int position) {
            if (room == null) return;

            // 设置标题
            String title = room.getTitle();
            if (title == null || title.isEmpty()) {
                title = generateRandomTitle(position);
            }
            roomTitle.setText(title);
            
            // 设置主播名称
            String name = room.getStreamerName();
            if (name == null || name.isEmpty()) {
                name = generateRandomName(position);
            }
            streamerName.setText(name);

            // 计算随机高度，实现瀑布流效果
            String seed = room.getId() != null ? room.getId() : String.valueOf(position);
            int h = Math.abs(seed.hashCode());
            float ratio = HEIGHT_RATIOS[h % HEIGHT_RATIOS.length];
            int baseHeight = (int) (itemView.getContext().getResources().getDisplayMetrics().density * 150);
            int imageHeight = (int) (baseHeight * ratio);
            
            ViewGroup.LayoutParams params = coverImage.getLayoutParams();
            params.height = imageHeight;
            coverImage.setLayoutParams(params);

            // 加载封面图片 - 使用更真实的图片
            loadCoverImage(room, position, h);

            // 加载主播头像
            loadAvatarImage(position);

            // 设置点赞数
            int likes = (h % 500) + 10;
            likeCount.setText(formatNumber(likes));
            likeIcon.setVisibility(View.VISIBLE);
            likeCount.setVisibility(View.VISIBLE);

            // 设置直播状态
            if (room.isLive()) {
                liveBadge.setVisibility(View.VISIBLE);
                viewerCountLayout.setVisibility(View.VISIBLE);
                int viewers = (h % 380) + 5;
                viewerCount.setText(formatNumber(viewers));
                playIcon.setVisibility(View.GONE);
                
                // 热门标签
                if (viewers > 200) {
                    hotBadge.setVisibility(View.VISIBLE);
                } else {
                    hotBadge.setVisibility(View.GONE);
                }
            } else {
                liveBadge.setVisibility(View.GONE);
                viewerCountLayout.setVisibility(View.GONE);
                playIcon.setVisibility(View.VISIBLE);
                hotBadge.setVisibility(View.GONE);
            }

            // 点击事件
            itemView.setOnClickListener(v -> {
                if (onRoomClick != null) {
                    onRoomClick.onRoomClick(room);
                }
            });
        }

        private void loadCoverImage(Room room, int position, int hash) {
            // 使用多种图片源，让内容更丰富
            String[] imageUrls = {
                "https://picsum.photos/seed/" + (hash % 1000) + "/400/500",
                "https://picsum.photos/seed/" + ((hash + 100) % 1000) + "/400/600",
                "https://picsum.photos/seed/" + ((hash + 200) % 1000) + "/400/450",
            };
            
            String imageUrl = imageUrls[position % imageUrls.length];
            
            Glide.with(coverImage.getContext())
                    .load(imageUrl)
                    .apply(new RequestOptions()
                            .placeholder(R.drawable.bg_cover_placeholder)
                            .error(R.drawable.bg_cover_placeholder)
                            .centerCrop())
                    .into(coverImage);
        }

        private void loadAvatarImage(int position) {
            String avatarUrl = "https://i.pravatar.cc/100?img=" + ((position % 70) + 1);
            
            Glide.with(streamerAvatar.getContext())
                    .load(avatarUrl)
                    .apply(new RequestOptions()
                            .placeholder(R.drawable.ic_account_circle_24)
                            .error(R.drawable.ic_account_circle_24)
                            .circleCrop())
                    .into(streamerAvatar);
        }

        private String generateRandomTitle(int position) {
            String[] titles = {
                "#健身穿搭 #一万种健与美 #健身女孩 #完美身材",
                "避雷秀厢附近租房",
                "找线下收U换现 可长期合作 有实力的私面聊",
                "我提笔不为离愁 只为你转身回眸",
                "今日穿搭分享 #日常穿搭 #时尚",
                "周末vlog #生活记录 #美好生活",
                "美食探店 #吃货日常 #美食推荐",
                "旅行日记 #风景 #旅行攻略",
                "护肤心得分享 #护肤 #美妆",
                "读书笔记 #好书推荐 #阅读"
            };
            return titles[position % titles.length];
        }

        private String generateRandomName(int position) {
            String[] names = {
                "小桃兔兔", "别管我了", "火火", "RicLei", 
                "甜甜圈", "小确幸", "追光者", "星河漫步",
                "清风徐来", "月光宝盒"
            };
            return names[position % names.length];
        }

        private String formatNumber(int num) {
            if (num >= 10000) {
                return String.format("%.1fw", num / 10000.0);
            } else if (num >= 1000) {
                return String.format("%.1fk", num / 1000.0);
            }
            return String.valueOf(num);
        }
    }

    private static final DiffUtil.ItemCallback<Room> DIFF = new DiffUtil.ItemCallback<Room>() {
        @Override
        public boolean areItemsTheSame(@NonNull Room oldItem, @NonNull Room newItem) {
            String o = oldItem.getId();
            String n = newItem.getId();
            return o != null && o.equals(n);
        }

        @Override
        public boolean areContentsTheSame(@NonNull Room oldItem, @NonNull Room newItem) {
            return oldItem.equals(newItem);
        }
    };
}