Android 9 has been released and comes with substantial privacy and security improvements. My Android hardening work including many features that were in development and not yet refined enough to be published would need to be ported or rewritten for Android 9 to be useful again.
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Some features wouldn't need to be ported since they're already part of Android 9. The background access restrictions are only partially implemented and would need to be redesigned to fit into Google's approach. Many features that are still relevant never got ported to 8.0/7.0...
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I don't currently have any resources to work on it, so for now it's going to continue rotting away. I only ever published the code queued up for stable releases and most of the work never even made it that far since it's so difficult to keep up with such a quickly evolving base.
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Reviving it would require a properly resourced development team rather than having to do all of the work myself again. The baseline release engineering, testing and debugging needs to be done regardless of the team size and it's far too large of a workload for even a few people.
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Expanding the hardening features in the stable releases also means greatly increasing the maintenance burden and the porting work for each new release. The hard part isn't usually developing features but maintaining them, especially when they uncover endless bugs in other code.
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