Hey Android devs. I discovered that Android Studio 3.0 will inject some files for the new profiler <https://developer.android.com/studio/preview/features/android-profiler.html> (libperfa_x86.so, perfa.jar, perfd) into the APK under certain conditions: - Build the APK with Android Studio 3.0+ (i.e. not Gradle) - Running on an API 26+ device (or perhaps explicitly enabled advanced debugging on prior API levels) - Have opened the “Android Profiler” tab at least once since the AS process started
These will go in the data directory, e.g. `/data/data/org.mozilla.focus.debug`. You might care if you're making some assertions about what is in the app's data directory, like we were for Focus after deleting the user's browsing session. You can find the investigation of this in the corresponding focus-android github issue <https://github.com/mozilla-mobile/focus-android/issues/1842> and a (honestly, very) few additional details in my blog post <http://mcomella.xyz/blog/2017/as-3-profiler-injects-files.html>. Let me know if you have questions! - Mike (:mcomella)
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