Recyclerview多布局设置item间距

 /**
         * 设置RecyclerView的间距
         * 这样可以实现Grid和RecyclerView单条显示时，很好的区分开
         */
        recyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
            @Override
            public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
                GridLayoutManager.LayoutParams layoutParams = (GridLayoutManager.LayoutParams)view.getLayoutParams();
                int spanSize = layoutParams.getSpanSize();
                int spanIndex = layoutParams.getSpanIndex();
                //     outRect.top = 20;
                /**
                 * 不相等时说明是Grid形式显示的
                 * 然后判断是左边还有右边显示，分别设置间距为15
                 */
                if (spanSize!=manager.getSpanCount()){
                    switch (spanIndex){
                        case 0:
                            outRect.left = convertDpToPixel(15);
                            break;
                        case 1:
                            outRect.left = convertDpToPixel(7);
                            outRect.right = convertDpToPixel(7);
                            break;
                        case 2:
                            outRect.right = convertDpToPixel(15);
                            break;
                    }
                }
            }
        });