下载的文件被自动删除 [英] Downloaded files get deleted automatically

问题描述

在我的应用中，用户可以下载一些文件.这些文件通过安卓下载管理器下载.但是，几周以来，数百名用户一直抱怨他们的文件每 8 到 12 天就会自动删除一次，甚至没有卸载应用程序.(可能还有更多的用户不愿意抱怨同样的事情.)

In my app, there are a few files that users can download. The files get downloaded via the android download manager. But, since a few weeks now, hundreds of users have been complaining that their files automatically keep deleting every 8-12 days, without them even uninstalling the app. (There might be many more users who haven't bothered to complain about the same.)

现在，可能有许多特定于用户的原因会在少数设备上发生这种情况.但是考虑到庞大的用户数量，我似乎做错了什么.

Now, there could be a number of user-specific reasons why that would happen on a few devices. But considering the huge number of users, it seems that I might have been doing something wrong.

为什么系统/下载管理器会自动删除文件?有没有办法通知系统或下载管理器不要删除某些文件?或者我应该在下载后重命名文件，以便将它们与下载管理器取消链接，并希望问题由此得到解决?

Why would the system/download manager delete the files automatically? Is there a way to inform the system or the download manager to not delete certain files? Or should I just settle with renaming the files after downloading, so as to unlink them from the download manager, and hope that the problem gets solved with just that?

这是我用来下载文件的代码:

Here's the code that I use to download the files:

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(trackLink));
request.setTitle(trackTitle);
request.setDestinationInExternalPublicDir("Tracks", trackTitle + ".mp3");
request.setVisibleInDownloadsUi(false);
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);

推荐答案

我也遇到了这个问题.查看 DownloadIdleService 的源代码，如果下载设置为在 UI 中不可见，它们会在 7 天后被删除，因为它们被认为是陈旧的".这是DownloadIdleService 中的javadoc:

I also came across this issue. Looking at the source for DownloadIdleService it appears that if the download are set to not be visible in the UI they're deleted after 7 days as they're considered "stale". Here's the javadoc fromDownloadIdleService:

/**
 * Remove stale downloads that third-party apps probably forgot about. We
 * only consider non-visible downloads that haven't been touched in over a
 * week.
 */

https://android.googlesource.com/platform/packages/providers/DownloadProvider/+/master/src/com/android/providers/downloads/DownloadIdleService.java#110

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