Problem with alignment source in the horizontal RecyclerView Linear Layout Manager?

Problem with alignment source in the horizontal RecyclerView Linear Layout Manager?

I got some sauce horizontal RecyclerView LinearLayoutManager I've made my class file pretty good.

However, I found a phenomenon that works well and sometimes the middle alignment is one space off, but I couldn't find the code in question, so I'm asking for your help.

The question was long, so I put it on the next page.

<Question> Where is the problem with the Linear Layout Manager source that aligns the horizontal RecyclerView items in the middle?/[Android] http://blog.daum.net/andro_java/869

I'd really appreciate it if anyone could help me.