Question

在比较两个日期后，我在消息上方显示日期。如果我显示每个项目的日期，它工作正常。但是当我试图展示Today，Yesterday和date时，它始终只显示date。这里的日期并没有错，但它在格式化日期出错了。

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MMM dd, yyyy hh:mm:ss");
    try {
        Date current_itemDate = simpleDateFormat.parse(chatMessage.getDateTime());

        DateFormat outputFormat = new SimpleDateFormat("hh:mm a");
        Date date = simpleDateFormat.parse(chatMessage.getDateTime());
        holder.timeTextView.setText(outputFormat.format(date));
        long previousTs = 0;
        if (position > 0) {
            ChatMessage pm = chatMessages.get(position - 1);
            previousTs = simpleDateFormat.parse(pm.getDateTime()).getTime();
        }
        setTimeTextVisibility(current_itemDate.getTime(), previousTs, holder.textViewTimePeriod,
                holder.dividerTop);

    } catch (ParseException e) {
        e.printStackTrace();
    }

我正在使用逻辑显示日期或日期TextView，如下所述。如果我做错了，请告诉我。

 private void setTimeTextVisibility(long now_tm, long msg_tm, TextView timeText, View dividerTop) {
    Calendar now_calendar = Calendar.getInstance();
    Calendar msg_calendar = Calendar.getInstance();
    now_calendar.setTimeInMillis(now_tm);
    msg_calendar.setTimeInMillis(msg_tm);
    boolean sameDay = now_calendar.get(Calendar.YEAR) == msg_calendar.get(Calendar.YEAR) &&
            now_calendar.get(Calendar.MONTH) == msg_calendar.get(Calendar.MONTH)
            && now_calendar.get(Calendar.DAY_OF_MONTH) == msg_calendar.get(Calendar.DAY_OF_MONTH);
    if (msg_tm == 0) {
        timeText.setVisibility(View.VISIBLE);
        dividerTop.setVisibility(View.VISIBLE);
        if (now_calendar.get(Calendar.DATE) == msg_calendar.get(Calendar.DATE)) {
            timeText.setText("Today");
        } else if (!sameDay) {
            timeText.setText("Yesterday");
        } else {
            timeText.setText("" + new SimpleDateFormat("dd MMM, yyyy").format(new Date(now_tm)));
        }
    } else {
        if (sameDay) {
            timeText.setVisibility(View.GONE);
            dividerTop.setVisibility(View.GONE);
            timeText.setText("");
        } else {
            timeText.setVisibility(View.VISIBLE);
            dividerTop.setVisibility(View.VISIBLE);
            timeText.setText("Today");
        }

    }
}

Answer 1

尝试将您的日期转换为Millis，然后使用这些<,>,<=,>=,==,!=运算符进行比较或查看此link

.after用于比较日期

Answer 2

在这里，我想向其他开发人员展示我们如何在whatsapp应用程序之类的消息显示前一天。

select

在RecyclerView适配器中显示错误的日期

2 个答案: