Recycleview 设置底部的线条

adapter=new SysMessageAdapter1(getActivity());
        //创建默认的线性LayoutManager
      LinearLayoutManager  mLayoutManager = new LinearLayoutManager(getActivity());
        listview.setLayoutManager(mLayoutManager);
//如果可以确定每个item的高度是固定的，设置这个选项可以提高性能
        listview.setHasFixedSize(true);
        listview.addItemDecoration(new RecyclerView.ItemDecoration() {
            @Override
            public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
                super.getItemOffsets(outRect, view, parent, state);
                //设定底部边距为30px
                outRect.set(0, 0, 0, 30);
            }

        });
//创建并设置Adapter