为什么此CalendarView为空(什么也不显示)? [英] Why is this CalendarView empty (showing nothing)?
问题描述
我正在开发一个名为Infinite Calendar的应用程序.它不是无限的，因为一切都有极限，我现在正在寻找这个极限.我正在使用CalendarView来显示日历，并使用JodaTime来帮助我处理日期.
I am developing an app called Infinite Calendar. And it is not infinite because everything has a limit and I am now finding this limit. I am using a CalendarView to display a calendar and JodaTime to help me to deal with dates.
我的布局只有一个视图:
My layout has only one view:
<CalendarView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:showWeekNumber="false"
android:shownWeekCount="5"
android:id="@+id/calendar">
</CalendarView>
我正在通过代码设置maxDate和minDate:
And I am setting the maxDate and minDate by code:
calendar.setMinDate (0);
calendar.setMaxDate (9223372017014400000L);
为什么我要使用9223372017014400000L?因为经过一些实验，我发现这是JodaTime可以获得的最大值.为什么不将它们设置在布局文件中?因为我不知道格式.我之前尝试过几次，但是它一直抛出异常，说最大小于最小...
And why did I use 9223372017014400000L? Because after some experiments, I found that is the maximum that JodaTime can get. And why didn't I set them in the layout file? Because I don't know the format. I tried a few times before but it kept throwing exceptions saying that the max is less than the min...
现在，我认为，到目前为止，一切都很好.因此，我尝试将日期设置为一些非常大的数字:
Now I think, that's so far so good. So I tried to set the date to some really big numbers:
Date date = new LocalDate (2000000, 1, 1).toDate ();
calendar.setDate (date.getTime ());
实际上，我什至不知道我是否做得很好，或者只是在屠宰它.
Actually I don't even know if I am doing this well or if I am just butchering this.
现在奇怪的事情发生了.当我运行该应用程序时，CalendarView只会在顶部显示月份，年份和星期几！我搜索并发现了另一个与此类似的问题:
Now the strange thing happens. When I run the app, the CalendarView shows nothing but the month, the year and the days of week at the top! I searched and found another question similar to this:
但是答案告诉OP将尺寸设置为match_parent，这显然是我做的.
But the answer told the OP to set the dimensions to match_parent, which I did apparently.
那么问题来了，这是否有特殊原因?如果是，那是什么，我该如何解决?如果否，CalendarView的限制是多少?
So here comes the questions, is there a special cause of this? If yes, what is it and how can I fix it? If no, what is the limit of CalendarView?
更新:
我尝试将最小日期设置为默认值(未指定)，将最大日期设置为1/1/2000000，然后将日期设置为1/12000000.现在，日历视图将显示日期和其他日期(1999999)！真奇怪！
I tried to set the min date to default (not specifying that) and the max date to 1/1/2000000 and then set the date to 1/12000000. Now the calendar view shows the the date and other dates in 1999999! How weird!
乔恩·斯基特(Jon Skeet)，请帮助我！
Jon Skeet please help me!
推荐答案
从我自己的手机上使用Google自己的日历应用程序(直到2038年)来看，我想他们的CalendarView会遇到由 2038年问题.这可能是它支持的最长日期，尽管我在文档中找不到任何提及.
Judging by Google's own Calendar app on my phone which only goes up to the year 2038, I imagine their CalendarView suffers from a similar issue created by the Year 2038 Problem. This is probably the maximum date it supports, though I couldn't find any mention of that in the documentation.
您最好使用时间的64位表示形式来研究其他解决方案或编写自己的解决方案-这应该可以覆盖大约3,000亿年...
You're probably better off looking into other solutions or writing your own, using 64 bit representations of the time - this should cover you for approximately 300 billion years...
顺便说一句:JodaTime使用时间的64位表示，因此要获得最大值，您要做的所有工作就是将63个连续的1s转换为十进制，从而得到9223372036854775807.无需进行实验，并且略高于您的结果.
An aside: JodaTime uses a 64 bit representation of the time, so all you have to do to get the max is convert 63 consecutive 1s to decimal which gets you 9223372036854775807. No experiments required and slightly higher than your result.
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