question: @ Override public void addFocusables ( ArrayList < View > views , int direction , int focusableMode ) { final int focusableCount = views . size ( ) ; final int descendantFocusability = getDescendantFocusability ( ) ; if ( descendantFocusability != FOCUS_BLOCK_DESCENDANTS ) { for ( int i = 0 ; i < getChildCount ( ) ; i ++ ) { final View child = getChildAt ( i ) ; if ( child . getVisibility ( ) == VISIBLE ) { ItemInfo ii = infoForChild ( child ) ; if ( ii != null && ii . position == mCurItem ) { child . addFocusables ( views , direction , focusableMode ) ; } } } } if ( descendantFocusability != FOCUS_AFTER_DESCENDANTS || ( focusableCount == views . size ( ) ) ) { if ( ! isFocusable ( ) ) { return ; } if ( ( focusableMode & FOCUSABLES_TOUCH_MODE ) == FOCUSABLES_TOUCH_MODE && isInTouchMode ( ) && ! isFocusableInTouchMode ( ) ) { return ; } if ( views != null ) { views . add ( this ) ; } } }
target:  We only want the current page that is being shown to be focusable.