Use Case 2

At this stage, we have achieved Use Case 2. You can select one or more items from the list, rotate your screen and still the list items and your selections are retained.

Use Case 3 also partially works at this point. If you Select some items, go to next screen, rotate once and return, then everything works as expected.

However, if you go to next screen and rotate multiple times, you get a NullPointerException in the onSaveInstanceState method of FirstFragment.