I am planning to release a trial version of my app and am looking into
best ways to implement the logic. My lite version of the app would
have all the features but will be time restricted. I see a couple of
issues:

- Currently there is no mechanism built into android that allows an
app to be closed.  I see that you can close the main acitivity, but
the user can always press the back button and go back into the app.

- After trial period, the user can always un-install the app and re-
install it. What do I do to prevent this from happening?

Any help is highly appreciated.

Thanks,
Slater.
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