public List<FlexLine> getFlexLines() {
        List<FlexLine> result = new ArrayList<>(mFlexLines.size());
        for (FlexLine flexLine : mFlexLines) {
            if (flexLine.getItemCountNotGone() == 0) {
                continue;
            }
            result.add(flexLine);
        }
        return result;
    }
@return the flex lines composing this flex container. This method returns a copy of the
original list excluding a dummy flex line (flex line that doesn't have any flex items in it
but used for the alignment along the cross axis).
Thus any changes of the returned list are not reflected to the original list.
common/src/main/java/com/sxjs/common/widget/flexboxlayout/FlexboxLayout.java