request
Call this to try to give focus to a specific view or to one of its descendants and give it hints about the direction and a specific rectangle that the focus is coming from. The rectangle can help give larger views a finer grained hint about where focus is coming from, and therefore, where to show selection, or forward focus change internally.
A view will not actually take focus if it is not focusable (isFocusable} returns false), or if it is focusable and it is not focusable in touch mode (isFocusableInTouchMode) while the device is in touch mode.
A View will not take focus if it is not visible.
See also focusSearch(int), which is what you call to say that you have focus, and you want your parent to look for the next one.
You may wish to override this method if your custom {@link View} has an internal View that it wishes to forward the request to.
Return
Whether this view or one of its descendants actually took focus.
Parameters
One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
The rectangle (in this View's coordinate system) to give a finer grained hint about where focus is coming from. May be null if there is no hint.