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96

answers:

2

Is there any way to receive the installation date of an android app? Or any other suggestions on how to accomplish a 30 day free trial version? Thanks alot.

+1  A: 

Just save the time when the application was first run. Then compare the time each time the program starts.

Another more secure way (the above tactic could be beaten by a simple reinstall) is to have a server of yours authenticate the imei number of the device the first time it's run and then continue the above method.

monoceres
+1  A: 

This already has a pretty good answer:

http://stackoverflow.com/questions/995719/android-trial-applications

Dave MacLean