onPause（）在我的活动中被调用。 然后，当回到顶部时，onResume（）永远不会被调用

Question

After the onPause() getting called, there are no calls to onStop() nor onDestroy() . The application is still running, and pid is the same (if I check it using "ps" Linux command). When the activity gets back on top, there are no calls to onCreate() nor onResume() . The app appears to be hanging. And after a while messages in the log appear saying "Activity destroy timeout for ActivityRecord". Oh, and it does not all the time. I can run it without getting stuck 2-3 times (with onStop() and onDestroy() called after onPause() , and the new activity getting created when it's time to get on top). But eventually I get the situation described in the title.

Any idea how this could happen? Many thanks :)

Answer 1

Well, the app was actually hanging in the state "after onPause() called and complete", waiting for a (not properly initialized) mutex while trying to handle an external event. The big part of the apps data was destroyed during onPause() , including that mutex.