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Posts: 23
Registered: ‎01-11-2014
My Device: Z10
My Carrier: Vodafone
Accepted Solution

Persisting files across installations

I am working on an app which persists some information in an XML file in the data folder so that a user can close the app and then restart and still find the data in the XML file. All is working fine but when I reinstall the app, that particular file is overwritten, which I do not want. I want a particular file to be persisted across installations. Another use case can be, when user is upgrading the app then the file may be overwritted.


I tried googling a lot but somehow could not find the relevant information.


Is there a way to mark that some particlar folder is not cleaned during uninstallation?

Can someone pls help me with this ?

Posts: 508
Registered: ‎01-19-2011
My Device: My Trusty Red Plane
My Carrier: Outer Space

Re: Persisting files across installations

normally, you would store store information like that on a server (+ a credential like login / username pwd/ or sth unique like email-adress. hardwareIDs would not work across installations on different devices).

in general, when the user uninstalls his app, everything should be cleared. with a server (and a login), users can restore their data again

If you just create an app for yourself, you can try google app engine. it's free to use for smaller apps, but if it gets large, it can cost quite a bit
I'm a bird from outer space. But I'm not flappy o.o
Posts: 17,024
Registered: ‎07-29-2008
My Device: Z10 LE, Z30, Passport
My Carrier: O2 Germany

Re: Persisting files across installations

when an app is uninstalled its sandbox is deleted, including its data directory.
the directory stays if you update the app.

if you really want to have something to remain you can use the shared folder, but i think that is a bad user experience to uninstall an app and have it leaving something behind. norton utilities style...
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Posts: 23
Registered: ‎01-11-2014
My Device: Z10
My Carrier: Vodafone

Re: Persisting files across installations



If the data directory and all its contents stay intact on updating an app...then I think my pupose would be served...thats what I want...


Thanks !



Posts: 749
Registered: ‎12-16-2008
My Device: BlackBerry Z30
My Carrier: Bell

Re: Persisting files across installations

If you ARE worried saving something small after the user uninstalls and reinstalls the app (or letting the access it across devices), you can integrate with BlackBerry Profile: 





Paul Bernhardt
Application Development Consultant

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