Call this to try to give focus to a specific view or to one of its descendants and give it a hint about what direction focus is heading. A view will not actually take focus if it is not focusable (View.Focusable returns false), or if it is focusable and it is not focusable in touch mode (View.FocusableInTouchMode) while the device is in touch mode. See also View.FocusSearch(FocusSearchDirection), which is what you call to say that you have focus, and you want your parent to look for the next one. This is equivalent to calling View.RequestFocus(FocusSearchDirection, Android.Graphics.Rect) with null set for the previously focused rectangle.

[Android Documentation]