如何使回收器视图滚动到onCreate中的最后一个位置

Question

我试图在片段启动时让RecyclerView移动到最后一个位置，但找不到解决方案。当一个新的"Pagina"插入数据库时，下面的代码工作得很好，它会移动到最后一个位置。但是，如果我关闭并重新打开它就会回到顶部。那么，创建片段时如何使平滑滚动工作呢？

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    appDatabase = AppDatabase.getDatabase(requireContext())
    val smoothScroller = object : LinearSmoothScroller(context) {
        override fun getVerticalSnapPreference(): Int = SNAP_TO_START
    }
    viewModelo = ViewModelProviders.of(this).get(ViewModelo::class.java)
    // Create the observer which updates the UI.
    val listPaginas = Observer <List<Pagina>> {
        // Update the UI, in this case, a TextView.
        recyclerViewAdapter?.addItens(it)  
            if (it.size < 1) {               
            smoothScroller.targetPosition = it.size
            } else {
               smoothScroller.targetPosition = it.size-1
        }      
        recyclerView?.layoutManager?.startSmoothScroll(smoothScroller)
    }
    viewModelo?.todasPaginas()?.observe(this, listPaginas)
}

Answer 1

尝试以下更改，它奏效了！

LinearLayoutManager manager = new LinearLayoutManager(Application.Context);
manager.setStackFromEnd(true); 
mRecyclerView.SetLayoutManager(manager);