public boolean onMove(MotionEvent e) {

    Day selectedDay = searchForSelectedDay((int) e.getX(), (int) (e.getY() + getScrollY()));

    if (selectedDay != null && selectedDay != mPreviousDay){
     defineDayContent(mPreviousDay, selectedDay);
    }

    ...

    defineDayContent(Day arg0, Day arg1){
     //iterates from arg0 till arg1 and sets the background
    for(Day d : (iterate from arg0 till arg1)){
d.setBackground(Calendar.BACKGROUND_DRAWABLE);
    }
    }