Question

The method suggested by android on how to obtain a unique id to track installations not devices is the following:

http://android-developers.blogspot.com/2011/03/identifying-app-installations.html

Does this mean by using the method above, users can “clear local data” on their devices meaning they will then have a new installation file installed?

I’m trying to find a decent way to limit the number of times my application is used,
any other suggestions are welcome,

Answer 1

Create an ID locally, store it in prefs, and then back it up using Data Backup to the cloud via the user’s Google Account, so when they reinstall it, the settings come back

http://developer.android.com/guide/topics/data/backup.html