Is onPause guaranteed to be called when an Activity is no longer running?

Question

I create a new thread in an activity and I rely on onPause() to interrupt the thread. If my app crashes, or the Activity somehow ceases to exist, I want the thread to be kil

Answer 1

If my app crashes

onPause() is not called here, but this shouldn't bother you as your entire app process ceases to exist, inclusive of all threads you have created (UI or otherwise).

Activity somehow ceases to exist

onPause() will be called whenever your Activity is moved to the background from the foreground, which is done in every conceivable way in which your Activity can be shut down, except for your app crashing. However, as I mentioned above, the app crashing will also by default kill your thread.

onPause() is essentially called whenever your Activity is no longer in the foreground. Your Activity may still be alive and in memory after onPause() has been called, but there is no scenario which I can think of in which your Activity is alive and in the background without onPause() being called.