Android Question Licence and expired date


Active Member
Licensed User
Longtime User
hi all
i wanted to create a licence for my apps
so the user will put his activation key and this key will update the exp_date in the table, for example 10 days or one month or 2,3,4,5,6,7....12 months depending on a key.
i would like to have unique keys every time , how do is do it where to start?


Licensed User
Longtime User
You could create an encrypted file key with the expiry date (so the user can't change it). Inside the app use a standard pw. Create a 2nd app to create those keys. Not 100% safe but it will do for 99% of the users. For encryption see Random Access File. This file can be send via email.

If you have a server, you could force the user to do a login and check if he/she is expired.

There are other solutions (like licencing) which are better. For a start and small apps the example above should do.
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