I'd like to explain and verify below, that the app is functioning as I described.
Android manages which state the app was in last, long as the application (task) has not been closed.
So if the app is open and you open another app or go to Home and you open the app again, it should be where you left it.
When you kill the app (task - task manager), the application when opened next restarts the app, and loads the main application page first, which by my design was the landscape view.
Is the app functioning as I described above? I'll provide further comments based on your response, thanks