Under low-memory conditions, the Android operating system can kill the process for any Activity that has been paused, stopped, or destroyed.This essentially means that any Activity not in the foreground is subject to a possible shutdown.
If the Activity is killed after onPause(), the onStop() and onDestroy() methods might not be called.The more resources released by an Activity in the onPause() method, the less likely the Activity is to be killed while in the background.
The act of killing an Activity does not remove it from the activity stack. Instead, the Activity state is saved into a Bundle object, assuming the Activity implements and uses onSaveInstanceState() for custom data, though some View data is automatically saved. When the user returns to the Activity later, the onCreate() method is called again, this time with a valid Bundle object as the parameter.
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