Get method documentation [Android Documentation]

Return whether the fullscreen extract view is shown. This will only return true if InputMethodService.IsFullscreenMode returns true, and in that case its value depends on the last call to InputMethodService.ExtractViewShown. This effectively lets you determine if the application window is entirely covered (when this returns true) or if some part of it may be shown (if this returns false, though if InputMethodService.IsFullscreenMode returns true in that case then it is probably only a sliver of the application).

Set method documentation [Android Documentation]

Controls the visibility of the extracted text area. This only applies when the input method is in fullscreen mode, and thus showing extracted text. When false, the extracted text will not be shown, allowing some of the application to be seen behind. This is normally set for you by InputMethodService.OnUpdateExtractingVisibility(Android.Views.InputMethods.EditorInfo). This controls the visibility of both the extracted text and candidate view; the latter since it is not useful if there is no text to see.