Android-回收站视图滚动到位置不起作用

Question

I am trying to retrieve data from firebase then display it in recycler view. I set the layout to be reverselayout = true. However, when I run the activity, the view starts at the bottom. I tried to change the initial position when the application is run using scrollToPosition as commented below, but still nothing changes. Does anyone have a solution related to this problem?

I've tried this: https://stackoverflow.com/a/26876044/7825519 But still start from bottom.

mRecyclerView!!.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false)
    (mRecyclerView!!.layoutManager as LinearLayoutManager).reverseLayout = true
    (mRecyclerView!!.layoutManager as LinearLayoutManager).stackFromEnd = true
    mRecyclerView?.scrollToPosition(3)
//        mRecyclerView?.smoothScrollToPosition(3)
//        (mRecyclerView!!.layoutManager as LinearLayoutManager).scrollToPositionWithOffset(3,0)
//        mNestedScrollView?.scrollTo(0,3)
    mAdapter = DiscoverAdapter(mItems, mPostKey, Static.mLikedPosts, this)
    mRecyclerView!!.adapter = mAdapter
    val spacingInPixels = resources.getDimensionPixelSize(R.dimen.margin_between_card)
    mRecyclerView!!.addItemDecoration(SpacesItemDecoration(spacingInPixels))

Answer 1

First of all delete the both lines that make the recyclerview start from the botom. Set the scrolling after you set the adapter:

mRecyclerView!!.adapter = mAdapter
mRecyclerView?.scrollToPosition(3)

Answer 2

尝试使用View post方法设置scrollToPosition