转换Android的日期字符串到日期对象 [英] Convert Android's date Strings to date objects

问题描述

在Android中，每一个事件的日期（如生日和纪念日）保存在字符串格式，例如： 2011-12-24。

这至少是我的电话的情况。其他一些手机也许存储这些日期等格式，如果他们有从阳历都不同的日历。

即使手机公历集，还有日期字符串以小时和分钟，没有。我得到这样的日期字符串，当我查询联系人表的事件：

<$p$p><$c$c>cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Event.ST‌​ART_DATE))

这将导致（例如）：

2011-12-14或2011-12-24T00：00：00Z

您可以看到，有很多不同的可能形式。为了计算与日期，我需要将它们从字符串转换为Date对象，不用我？

我怎样才能做到这一点？

PS：我知道有一个解析功能的Java日期对象：

 日期格式myDateFormat =新的SimpleDateFormat（DD / MM / YY）;
日期tempDate = myDateFormat.parse（24/12/2011）;
 

但在Android的，我不知道哪种格式我会遇到，是吧？

解决方案

安卓适用于日期对象。任何时候你需要分析的日期从字符串是因为该日期已系列化，最有可能在一个文件中。在这种情况下，可以知道所使用的格式。 Date对象是用在preferences，日期对象用于几乎无处不在我能想到的，涉及到共享服务，运动，等等。这意味着，有几乎从来没有一个需要解析字符串的日期，除非，像我说你再有系列化源工作，从Web服务等看完 如果你能告诉我们你的情况，你可能会得到更具体的答案。

您可以获取当前设置的日期格式是这样的：

 日期格式的日期格式= android.text.format.DateFormat.getDateFormat（getApplicationContext（））;
 

In Android, the date of every event (such as birthdays and anniversaries) is saved in String format, e.g. "2011-12-24".

This is at least the case for my phone. Some other phones may perhaps store these dates in other formats if they have a calendar different from the Gregorian one.

Even for phones with the Gregorian calendar set, there are date Strings with hours and minutes and without. I get such a date String when I query the contacts table for an event:

cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Event.ST‌​ART_DATE))

This results in (for example):

"2011-12-14" or "2011-12-24T00:00:00Z"

You can see that there are lots of different possible formats. In order to calculate with dates, I need to convert them from String to Date objects, needn't I?

How can I do this?

PS: I know there is a parse function for java date objects:

DateFormat myDateFormat = new SimpleDateFormat("dd/MM/yy");
Date tempDate = myDateFormat.parse("24/12/2011");

But in Android, I don't know which format I'll be confronted with, do I?

解决方案

Android works with date objects. Anytime you need to parse a date from string is because that date has been serialized, most likely in a file. In that case, you would know the format that was used. Date object is used in preferences, date object is used almost everywhere I can think of that relates to shared services, activites, etc. This means, there's almost never a need to parse string from date unless, like I said you're working with serialized source, reading it from a web service etc. If you can tell us your scenario, you might get more specific answer.

You can get the currently set date format like this:

DateFormat dateFormat = android.text.format.DateFormat.getDateFormat(getApplicationContext());

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