如何在Flutter中像Youtube一样显示之前的时间

Question

我正在编写一个 flutter 应用程序来使用Youtube API V3克隆一些 Youtube 功能。

该应用程序从 YouTube 视频 API获取字符串形式的视频时间戳

每个时间戳都具有以下格式：

YYYY-MM-DDTHH:MM:SSZ

一个例子是：

2020-07-12T20:42:19Z

我想以文本形式显示：

• 1小时
• 1 小时前
• 4 周前
• 11 个月前
• 1年以前
• ...

Answer 1

我在 String 上创建了一个扩展

 extension StringExtension on String {
  static String displayTimeAgoFromTimestamp(String timestamp) {
    final year = int.parse(timestamp.substring(0, 4));
    final month = int.parse(timestamp.substring(5, 7));
    final day = int.parse(timestamp.substring(8, 10));
    final hour = int.parse(timestamp.substring(11, 13));
    final minute = int.parse(timestamp.substring(14, 16));

    final DateTime videoDate = DateTime(year, month, day, hour, minute);
    final int diffInHours = DateTime.now().difference(videoDate).inHours;

    String timeAgo = '';
    String timeUnit = '';
    int timeValue = 0;

    if (diffInHours < 1) {
      final diffInMinutes = DateTime.now().difference(videoDate).inMinutes;
      timeValue = diffInMinutes;
      timeUnit = 'minute';
    } else if (diffInHours < 24) {
      timeValue = diffInHours;
      timeUnit = 'hour';
    } else if (diffInHours >= 24 && diffInHours < 24 * 7) {
      timeValue = (diffInHours / 24).floor();
      timeUnit = 'day';
    } else if (diffInHours >= 24 * 7 && diffInHours < 24 * 30) {
      timeValue = (diffInHours / (24 * 7)).floor();
      timeUnit = 'week';
    } else if (diffInHours >= 24 * 30 && diffInHours < 24 * 12 * 30) {
      timeValue = (diffInHours / (24 * 30)).floor();
      timeUnit = 'month';
    } else {
      timeValue = (diffInHours / (24 * 365)).floor();
      timeUnit = 'year';
    }

    timeAgo = timeValue.toString() + ' ' + timeUnit;
    timeAgo += timeValue > 1 ? 's' : '';

    return timeAgo + ' ago';
  }
}

然后以文字方式调用：

StringExtension.displayTimeAgoFromTimestamp(video.timestamp)