protected override void OnCreate(Bundle savedInstanceState) { base.OnCreate(savedInstanceState); HelloMoonActivity.Context = this; // Set our view from the "main" layout resource SetContentView(Resource.Layout.activity_hello_moon); // Using a FrameLayout instead of a fragment in the activity_hellomoon.axml layout Fragment fragment = FragmentManager.FindFragmentById(Resource.Id.fragmentContainer); if (fragment == null) { fragment = new HelloMoonFragment(); FragmentManager.BeginTransaction().Add(Resource.Id.fragmentContainer, fragment).Commit(); } }