blocks|key|527513|text|我建议您使用单例来管理首选项。无论你是通过实现一个true+java+singleton，还是使用安卓的Application+Context来实现这一点，都取决于你。(请参阅this+question，了解支持/反对每种方法的几个很好的论点)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|527514|对于像SharedPreferences这样的东西，这是一种管理它们的好方法，特别是对于多线程应用程序。这可能会消除一些关于提交是否相互冲突的问题。这可能不是问题的全部，但它是开始的地方。|style|CODE|527515|entityMap|0|LINK|mutability|MUTABLE|url|http://www.javaworld.com/javaworld/jw-04-2003/jw-0425-designpatterns.html|1|http://blog.tomgibara.com/post/126377651/global-application-state-in-android|2|https://stackoverflow.com/questions/3826905/singletons-vs-application-context-in-android^0|P|J|0|1G|J|1|2G|D|2|0|3|H|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]|$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|6|7|13|8|@$A|14|B|15|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]]]

I suggest you use a singleton to manage the preferences. Whether you do this by implementing a <a href="http://www.javaworld.com/javaworld/jw-04-2003/jw-0425-designpatterns.html" rel="nofollow noreferrer">true java singleton</a>, or by using Android's <a href="http://blog.tomgibara.com/post/126377651/global-application-state-in-android" rel="nofollow noreferrer">Application Context</a> is up to you. (see <a href="https://stackoverflow.com/questions/3826905/singletons-vs-application-context-in-android">this question</a> for several good arguments for/against each)

For something like <code>SharedPreferences</code>, this is a good way to manage them especially for a multi-thread application. This will possibly eliminate some of the questioning of whether or not the commits are conflicting with each other. This may not be the whole problem, but it's somewhere to start.

blocks|key|744128|text|我会回应其他的答案-如果你不想损坏文件，你需要避免冲突-我会进一步暗示你可能误用了SharedPreferences。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|744129|SP设计用于存储有关应用程序用户设置的小片段信息，如音量或是否正在播放音乐等。|744130|SP不是为存储频繁变化的数据和/或大量数据而设计的，尝试这样做并不是一个好主意(出于您已经发现的原因和其他一些原因)。|744131|请记住，SP实际上只是一个XML文件-每次更改它时，您都会招致解析和重新创建的开销！|744132|我认为，应用程序在多个线程中更新SP的想法有点疯狂--你需要一种更好的方式来管理和存储你保存的数据--它将以多种方式为你带来回报……|744133|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I'd echo the other answers - that you need to avoid conflicts if you don't want to corrupt the file - and I'd go further to suggest that you're probably misuing SharedPreferences.

SPs are designed to store small pieces of information about your app - user settings like volume or whether music is playing or things like that.

SPs are NOT designed for storing data which changes often and/or large amounts of data and it's a bad idea to try to do this (for the reasons you've discovered and a few others).

Remember that SPs are really just an XML file - you're incurring the overhead of parsing and recreating that every time you change it too!

The idea of an App which updates SPs in more than one thread is a bit mad I think - you need a better way of managing and storing the data you're saving - it will pay-off for you in more than one way...

blocks|key|527656|text|我有一个类似的问题:我的偏好没有可靠地保存。在一些设备上(在我的例子中是XOOM-Tablet)，数据有时会丢失，有时不会。在提交新数据之前，我只需在编辑器上调用clear()就解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|527657|Shared+Preferences+get+lost+after+shutting+down+device+or+killing+the+app|offset|length|527658|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/9803838/shared-preferences-get-lost-after-shutting-down-device-or-killing-the-app#comment12495021_9803838^0|0|0|21|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I had a similar problem: my preferences had not been saved reliably. On some devices (in my case the XOOM-Tablet) data got sometimes lost and sometimes not. I've solved the problem by simply calling clear() on the editor before commiting new data.

<a href="https://stackoverflow.com/questions/9803838/shared-preferences-get-lost-after-shutting-down-device-or-killing-the-app#comment12495021_9803838">Shared Preferences get lost after shutting down device or killing the app</a>

blocks|key|744297|text|我发现我在SharedPreferences中丢失了一个特定的条目，打开编辑器，对它执行getString，然后在没有对条目执行putString的情况下执行committing，即使没有必要的更改也是如此。一旦我不管怎样都在putString中存根以保存值，条目在commit之后就不再消失了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|744298|entityMap^0|5|H|18|9|1S|9|27|A|35|9|3P|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|G|$]]

I found I was losing a particular entry in <code>SharedPreferences</code> by opening the editor, doing a <code>getString</code> on it, and then <code>committing</code> without doing a <code>putString</code> on the entry first, even if there was no required change. Once I stubbed in a <code>putString</code> to save the value no matter what, the entry stopped vanishing after the <code>commit</code>.

Some of the users of my application complain that sometimes (in a random way) the settings of my application are getting reverted to their default state (usually after a reboot of the phone). I never managed to reproduce the problem though. I am thinking it is due to the fact that in many places in my app I have a piece of code that calls the shared preferences editor and commits changes - Can it resolves in corrupting the shared preference file if I try to commit several changes to the same preference file at the same time? (Multi-thread application)

I am really lost. I tried to look in the web for hours to find a solution without a success. 

If anyone has even an idea so I can start investigating, I would be grateful.

Thanks,
Amit Moran

Android - Shared Preferences are lost sometimes

我的应用程序的一些用户抱怨说，有时(以随机的方式)我的应用程序的设置会恢复到他们的默认状态(通常是在手机重启之后)。然而，我从未设法重现这个问题。我在想，这是因为在我的应用程序中的许多地方，我有一段代码调用共享首选项编辑器并提交更改-如果我试图同时提交对同一首选项文件的几个更改，它能解决破坏共享首选项文件的问题吗？(多...

问Android共享的首选项有时会丢失
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