Fixed exception: No constructor found for MonoGameAndroidGameView::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership). Caused by virtual member call in constructor.
Removed unnecessary _activity member from OrientationListener. Fixes possible leak of Activity instance.
Merge pull request #2633 from Andreyul/no_ctor_found

Fixed exception: No constructor found for MonoGameAndroidGameView