RExItemDecoration.java 文件源码

@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    final RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();//布局管理器
    final RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) view.getLayoutParams();
    final int viewLayoutPosition = layoutParams.getViewLayoutPosition();//布局时当前View的位置
    final int viewAdapterPosition = layoutParams.getViewAdapterPosition();

    getItemOffsets(outRect, layoutManager, viewAdapterPosition, getEdge(viewAdapterPosition, layoutManager));
}