protected virtual void SwitchFragment(FragmentManager manager, AView targetView, ShellItem newItem, bool animate = true) { Profile.FrameBegin(); Profile.FramePartition("IsDesignerContext"); if (AndroidContext.IsDesignerContext()) { return; } Profile.FramePartition("CreateShellItemRenderer"); var previousRenderer = _currentRenderer; _currentRenderer = CreateShellItemRenderer(newItem); _currentRenderer.ShellItem = newItem; var fragment = _currentRenderer.Fragment; Profile.FramePartition("Transaction"); FragmentTransaction transaction = manager.BeginTransaction(); if (animate) { transaction.SetTransitionEx((int)global::Android.App.FragmentTransit.EnterMask); } transaction.ReplaceEx(_frameLayout.Id, fragment); transaction.CommitAllowingStateLossEx(); Profile.FramePartition("OnDestroyed"); void OnDestroyed(object sender, EventArgs args) { previousRenderer.Destroyed -= OnDestroyed; previousRenderer.Dispose(); previousRenderer = null; } if (previousRenderer != null) { previousRenderer.Destroyed += OnDestroyed; } Profile.FrameEnd(); }