Android “remembers” shared preferences after complete app uninstall

Question

In my Android app I use a set of randomly generated file names to store some data. In order to ensure that the same set of file names are generated at app restart - and are

Answer 1

Based on @hungryghost's suggestion the I eventually implemented a solution

Problem:Shared preferences can be remembered by Android after app reinstall and blanket instructions in the manifest along the lines of android:allowBackup = "false" are not a solution.

So why not turn the problem into a solution on its own? Here is what I do

• Check shared preferences for a build specific key.

• If that key is not found I do two things

  1. Clear out all shared preferences, context.deleteSharedPrefernces(filename)
  2. Now create that build specific key
  3. When I make app changes that require old preferences to be forgotten I simply change the build specific key.