#RecyclerView 下划线

垂直线性布局

mDecor = new LineItemDecoration(this, 1, Color.parseColor("#00FFFF"));

mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.addItemDecoration(mDecor);

网格布局功能

构造方法
public GridLineItemDecoration(Context context ,int lineColor, int spanCount, int dividerWidthDp) {....}

mDecor = new GridLineItemDecoration(this,Color.GRAY, 3, 2);
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
mRecyclerView.addItemDecoration(mDecor);
mRecyclerView.setAdapter(new LineAdapter());