Hello,
I will try to explain this issue which is a bit elaborate. I found it when I upgraded the SfTabView from 16.1.0.32 to 16.1.0.37 (only in Android).
I have a TabView (button at the bottom) that contains a couple of ContentViews each with several controls such as Entry and such. I also have the following line in my MainActivity:
Xamarin.Forms.Application.Current.On().
UseWindowSoftInputModeAdjust(WindowSoftInputModeAdjust.Resize);
When the user taps on an Entry the keyboard pops up and the page resizes so that the TabView navigation buttons are still visible. When I upgraded my solution the TabView appears to steal the focus from the entry when the screen resizes. So, the user taps the entry, keyboard pops up, screen resizes, entry is unfocused, keyboard disappears... unhappy user.
I solved the issue by reverting to the version 16.1.0.32 which works correctly.
I hope this helps,
Jose