gistfile1.txt

post_content_rv.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
                super.onScrolled(recyclerView, dx, dy)
                
                val rateViewInRecyclerView: View? =
                        postAdapter.stickyLayoutManager.findViewByPosition(postItems.indexOf(rateBaseItem))
                        
                if (rateViewInRecyclerView != null) {
                    if (rateViewInRecyclerView.yLocationInWindow() != 0 &&
                            (rateViewInRecyclerView.yLocationInWindow() < initialRateViewYPosition)) {
                        post_rate_container?.animate()?.yBy((
                                rateViewInRecyclerView.yLocationInWindow() -
                                post_rate_container.yLocationInWindow()).toFloat())?.setDuration(0)?.start()
                    }
                }
            }

            override fun onScrollStateChanged(recyclerView: RecyclerView?, newState: Int) {
                super.onScrollStateChanged(recyclerView, newState)
                if (newState == SCROLL_STATE_IDLE) {
                
                    val rateViewInRecyclerView: View? =
                            postAdapter.stickyLayoutManager.findViewByPosition(postItems.indexOf(rateBaseItem))
                            
                    if (rateViewInRecyclerView == null || rateViewInRecyclerView.yLocationInWindow() > initialRateViewYPosition) {
                        if (post_rate_container != null) {
                            post_rate_container.animate()?.yBy((
                                    initialRateViewYPosition -
                                            post_rate_container.yLocationInWindow()).toFloat())?.setDuration(100)?.start()
                        }
                    }
                }
            }
        })