How to restore the state of an activity when returning to it using the back button from the actionbar?

Question

Android

There is Activity_1 with ListView. By clicking on the item, we go to Activity_2 in the ActionBar, which has a "back" button. You need to click on this button to return to Activity_1, so that you get to that part of the ListView that was displayed before opening Activity_2. How can this be done?
Activity_1 in AndroidManifest is listed as the parent of Activity_2. This solution was found, but it only works for the "back" button on the navigation bar:

Parcelable state = listView.onSaveInstanceState();
listView.setAdapter(adapter);
listView.onRestoreInstanceState(state);

It is also interesting what happens to Activity_1 and Activity_2 after pressing the "back" button in the ActionBar. Is there any difference from clicking the "back" button on the navigation bar? Which?
The code above is called in the onLoadFinished method of the LoaderCallbacks interface, if that matters.

Answer 1

I don't know for sure, but I'm guessing.
Apparently there is a problem of "immersion".
Try after the transition:
1. Kill Activity_1. Check that all Activities are at the same initialization level.
2. Monitor the state of nested loops and prevent "rings".