[android-developers] Re: Storing data on the SD card in Froyo - files deleted when upgrading

If you're using API Level 8 or greater, use getExternalFilesDir(null)
to save a File.

It will be deleted when you upgrade to a newer version.

On 7月25日, 上午3時57分, Dianne Hackborn <hack...@android.com> wrote:
> Ergh...  that may be a bug. :(  To be clear, when doing the update your
> internal data is not being erased, but the data on the SD card is?
>
> On Sat, Jul 24, 2010 at 10:11 AM, Joseph Earl <joseph.w.e...@gmail.com>wrote:
>
>
>
>
>
> > I have an application which resides on the phone memory but downloads
> > large data to the SD card on first launch (the app needs to be able to
> > work without an internet connection most of the time)
>
> > When using the recommend directory given in Froyo it seems all files
> > on the SD card are deleted when I install a newer version of the .apk.
> > I'd preferably like the files removed on uninstall, but not on upgrade
> > since the files on the SD card aren't going to change between
> > application versions, and forcing the user to re-download a large file
> > that is independent of the application version does not seem
> > reasonable.
>
> > At the moment it seems I'm forced to use a different directory to the
> > recommended one in order to stop Froyo deleting all the files when the
> > application is upgraded.
>
> > Am I doing something wrong, or is this how it is supposed to work (I'm
> > guessing it is)? (Or perhaps I misunderstood what getExternalFilesDir
> > is for)
>
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> --
> Dianne Hackborn
> Android framework engineer
> hack...@android.com
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails.  All such
> questions should be posted on public forums, where I and others can see and
> answer them.

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