Android RecyclerView item 间距 及是否包含四周边距 的设置

从别的文章看到的 但是不满足需求 或者我写错了 就我改了过来

    public class SpacesItemDecoration extends RecyclerView.ItemDecoration {

        private HashMap<String, Integer> spaceValue; //间隔
        private boolean includeEdge; //是否包含四周边距
        private int spanCount; //列数


        public static final String TOP_SPACE = "top_space";
        public static final String BOTTOM_SPACE = "bottom_space";
        public static final String LEFT_SPACE = "left_space";
        public static final String RIGHT_SPACE = "right_space";

        public SpacesItemDecoration(int spanCount, HashMap<String, Integer> spaceValue, boolean includeEdge) {
            this.spanCount = spanCount;
            this.spaceValue = spaceValue;
            this.includeEdge = includeEdge;
        }

        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {

            //这里是关键，需要根据你有几列来判断
            int position = parent.getChildAdapterPosition(view); // item position
            int column = position % spanCount; // item column


            if (includeEdge) {
                outRect.left = spaceValue.get(LEFT_SPACE) - column * spaceValue.get(LEFT_SPACE) / spanCount;
                outRect.right = (column + 1) * spaceValue.get(RIGHT_SPACE) / spanCount;
                if (position < spanCount) { // top edge 判断是首行
                    outRect.top = spaceValue.get(TOP_SPACE);
                }
                outRect.bottom = spaceValue.get(BOTTOM_SPACE); // item bottom
            } else {
                //outRect.left = column * spaceValue.get(LEFT_SPACE) / spanCount;
                if((column+1)/spanCount==0){
                    outRect.right=spaceValue.get(RIGHT_SPACE);
                }else {
                    outRect.right=0;
                }
                //outRect.right = spaceValue.get(RIGHT_SPACE) - (column + 1) * spaceValue.get(RIGHT_SPACE) / spanCount;
/*                if (position >= spanCount) {//不是首行
                    outRect.top = spaceValue.get(TOP_SPACE); // item top
                }*/
                outRect.bottom = spaceValue.get(BOTTOM_SPACE); // item bottom
                //只有首行设置上边距
                //if (position >= spanCount) {//不是首行
                //   outRect.top = spaceValue.get(TOP_SPACE); // item top
                //}else {
                //   outRect.top = 20; //首行
                //}

                //只有下边距
//                if (position > (parent.getAdapter().getItemCount() - spanCount)-1) {
//                    outRect.bottom = 100;
//                }
            }
        }
    }

我是不要外部边距，只要右下间距

HashMap<String, Integer> spacesVelue = new HashMap<>();
spacesVelue.put(SpacesItemDecoration.TOP_SPACE,0);
spacesVelue.put(SpacesItemDecoration.BOTTOM_SPACE,4);
spacesVelue.put(SpacesItemDecoration.LEFT_SPACE, 0);
spacesVelue.put(SpacesItemDecoration.RIGHT_SPACE,2);
recyclerView.addItemDecoration(new SpacesItemDecoration(3,spacesVelue, false));

最后

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