Android-设置使用情况标志

Question

I am currently creating an app and would like to create a demo version (free) and a full version.

However, I am wondering how I can set some sort of flag so that when the demo version has been used 5 times, you have to buy the full version to continue using. This usage will be detected on a submit button.

I was considering setting a flag in the app, however releasied that the user could uninstall the app and then re-install it overcoming my set flag (as this would set it back to 0).

Has anyone got any clever solutions for my little dilema?

Thanks

Answer 1

您可能想尝试此答案中的一种技术： https : //stackoverflow.com/a/996288/1205715

Answer 2

I think that is not possible with an local application. File saving to sdcard with strange filename can be a way but It is not perfect. In my opinion, Right way is using an application server that manages user run times with unique UUID.

Answer 3

It might also be worth thinking about an alternative approach.

In app purchases are now available, so you could have a free and a restricted section in your app, and use the in app purchase to unlock the restricted section. You see more developers going with this approach these days, rather than managing two versions of the app.

Also worth considering the fact that if you have a paid version of the app it can be pirated pretty quickly, one person just needs to get their hands on the full apk. However, if you go with the in app purchase model you will be letting google handle a lot of these issues for you.... just a thought, and the road I will be taking with my next app.