AndAppStore has a licensing system that might work for that.

On Oct 2, 9:32 am, chrisoz <[email protected]> wrote:
> Interesting!
>
> Our appplication on windows mobile gives the user 7 days trial before
> a licence must be bought. So the date needs to be stored on the
> device. If not, the user might uninstall the app, install again and
> get another 7 days trial and so on.
>
> This illustrates how Windows Mobile makes it possible to implement
> individual copy protection regimes. It seems issues such as these has
> not been a priority for the android designers.
>
> I played with the idea of using eg. the contacts content provider to
> create a dummy contact where data could be stored. Obviously, not only
> being annoying for the user, there's nothing to stop the user from
> deleting the contact.
>
> I think this will be an issue for more enterprise developers than our
> small company.
>
> On 2 Okt, 17:38, "nEx.Software" <[email protected]> wrote:
>
> > I'd say your options are:
>
> > 1) Save the data to the SD Card (Easiest, but as you said, fragile.)
> > 2) Save the data to the Web. (Not so easy, would be hard to work with
> > from other applications.)
> > 3) Provide the Content Provider as a separate application. (More work,
> > more complicated for end-user, but might suit your needs.)
>
> > Many of the in-built applications have separate content providers
> > (such as Contacts), but this doesn't present an issue for the user
> > because they did not have to install them and, for the purpose of this
> > discussion, the user cannot uninstall them. Might I ask... Why do you
> > need to persist the data after the application is uninstalled?
>
> > On Oct 2, 8:29 am, chrisoz <[email protected]> wrote:
>
> > > My application needs to store some application specific data on the
> > > device that persist, even when the app is uninstalled. Using files or
> > > databases is not possible as they are deleted with the app when the
> > > app is uninstalled. Storing it on an SD-card is too fragile. It is my
> > > understanding Content Providers also are deleted with their parent
> > > app?
>
> > > How can this be achieved?– Skjul sitert tekst –
>
> > – Vis sitert tekst –
>
>
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