Hi!
I'm not sure how to help, because've only met this problem when there
are several users set on a device.

If I install my app directly from Eclipse with my debug certificates,
then uninstall the app and try to install a production copy, made with
the release certificate, I've got the same error message
INSTALL_FAILED_DUPLICATE_PERMISSION.

Until I uninstall the app in every user by hand, I can't install the
new one. At least in your case the error message makes sense :)

When I was trying to understand that error message, I've read that it
affected permissions with android:protectionLevel  declared as
"signature". Are you using that? Can you change it to "normal" without
affecting your business model?


Marina

On Wed, Feb 18, 2015 at 11:58 AM, Marten Gajda <mar...@dmfs.org> wrote:
> Hi all,
>
> we've some problems with Android 5. There seems to be a new policy that
> requires two apps that define the same permissions to be signed by the same
> key. Otherwise you can't install the app getting the error
> INSTALL_FAILED_DUPLICATE_PERMISSION.
> This is very annoying and I'd like to know that the suggested
> solution/workaround to this is.
>
> We have an Open Source task app that provides access to the tasks via a
> ContentProvider. The concept pretty much equals the CalendarProvider. We
> also have a (not yet Open Source) sync app that can sync to this task app
> (or its ContentProvider).
> The problem is that (in contrast to the CalendarProvider) our users usually
> install the sync app first. That means the permissions of the task app are
> not known when the sync app is installed. So they are not granted
> automatically when the task app is installed afterwards.
>
> Until Android 5 the solution was to define the same permissions in the sync
> app. But that doesn't work any more in some cases. If the user compiles the
> task app himself he can not use our sync app at the same time, because they
> are not signed by the same key.
>
> How can we achieve that we protect access to the task ContentProvider by
> permissions still allowing them to use a self compiled version?
>
> Even if both apps are signed by the same key it doesn't seem to work in some
> cases (does Android 5 also require both apps to be from the same source?)
>
> A similar issue exists when another developer tries to build a sync app that
> can sync to our task app. He can not add the same permissions, because he
> can't use the same signing key. But if he can't add the same permission
> definition his app won't get the permission if it's installed before the
> task app is installed.
>
> What's the solution of this mess?
>
> thanks
>
> Marten
>
> --
> Marten Gajda
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> 01309 Dresden
> Germany
>
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> email: mar...@dmfs.org
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>
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