说道ItemDecoration不得不说三个方法：

/**
* @param c 画布
* @param parent RecyleView
* @param state RecyclerView的当前状态
*/
@Override（http://www.my516.com）
public void onDraw(Canvas c, RecyclerView parent,RecyclerView.State state) {
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/**
* @param outRect
* @param view RecycleView的itemView
* @param parent RecycleView
* @param state RecycleView 的状态
*/
@Override
public void getItemOffsets(Rect outRect,View view, RecyclerView parent, RecyclerView.State state)
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/**
* @param c 画布
* @param parent RecycleView
* @param state RecycleView的状态
*/
@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
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