RecyclerView可以像viewpaper使用

1、列表滚动指定的位置

recy_question为recyclerview的id

recy_question.scrollToPosition(3);

2、希望recyclerview可以像viewpaper一个item占满整个屏幕

new PagerSnapHelper().attachToRecyclerView(recy_question);

显示下标的话

recy_question.addOnScrollListener(new RecyclerView.OnScrollListener() {

      @Override
      public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {

                if (newState ==SCROLL_STATE_IDLE){

                    RecyclerView.LayoutManager lm =recy_question.getLayoutManager();

                    if(lminstanceof  LinearLayoutManager){

                        LinearLayoutManager ll = (LinearLayoutManager) lm;

                        int position = ll.findLastVisibleItemPosition();

                        tvTitle.setText((position+1) +"/" +count);

                    }

            }

        super.onScrollStateChanged(recyclerView, newState);

   }

    @Override
    public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {

            super.onScrolled(recyclerView, dx, dy);

    }

});

但是第一次需要自己写一个默认的下标