Java实现JSON时间戳转相对时间并在RecyclerView展示

1. 编写时间转换工具类 #

先创建一个工具类，用来把秒级时间戳转换成相对时间格式：

public class TimeUtils {
    public static String getRelativeTime(long timestamp) {
        // 将秒级时间戳转为毫秒级
        long publishedTime = timestamp * 1000;
        long currentTime = System.currentTimeMillis();
        long diff = currentTime - publishedTime;

        // 计算时间差对应的单位
        long seconds = diff / 1000;
        long minutes = seconds / 60;
        long hours = minutes / 60;
        long days = hours / 24;
        long weeks = days / 7;
        long months = days / 30;
        long years = days / 365;

        if (seconds < 60) {
            return seconds + "秒前";
        } else if (minutes < 60) {
            return minutes + "分钟前";
        } else if (hours < 24) {
            return hours + "小时前";
        } else if (days < 7) {
            return days + "天前";
        } else if (weeks < 4) {
            return weeks + "周前";
        } else if (months < 12) {
            return months + "个月前";
        } else {
            return years + "年前";
        }
    }
}

2. 确保实体类能获取时间戳 #

确认你的数据实体类（比如NewsItem）包含published_on字段的getter方法：

public class NewsItem {
    // 其他字段及getter方法
    private long published_on;

    public long getPublishedOn() {
        return published_on;
    }
}

3. 修改RecyclerView的ViewHolder与绑定逻辑 #

首先在ViewHolder中添加显示时间的TextView：

public class MyViewHolder extends RecyclerView.ViewHolder {
    TextView title, body, tvRelativeTime;
    ImageView imageViewUrl;

    public MyViewHolder(@NonNull View itemView) {
        super(itemView);
        title = itemView.findViewById(R.id.tv_title);
        body = itemView.findViewById(R.id.tv_body);
        tvRelativeTime = itemView.findViewById(R.id.tv_relative_time);
        imageViewUrl = itemView.findViewById(R.id.iv_image);
    }
}

然后修改onBindViewHolder方法，添加相对时间的设置逻辑：

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
    NewsItem currentItem = dataList.get(position);
    holder.title.setText(currentItem.getTitle());
    holder.body.setText(currentItem.getBody());

    // 生成并设置相对时间
    String relativeTime = TimeUtils.getRelativeTime(currentItem.getPublishedOn());
    holder.tvRelativeTime.setText(relativeTime);

    Glide.with(mContext)
            .load(currentItem.getImageurl())
            .into(holder.imageViewUrl);
}

这样就能将JSON中的秒级时间戳转换为「3分钟前」「1天前」这类相对时间格式，并在RecyclerView的每个条目里展示出来。

内容的提问来源于stack exchange，提问作者Reny