RecyclerView - 等待视图准备就绪

Question

当我开始我的活动时，我想展示我的教程，因此我需要等待RecyclerView准备就绪，在我的用例中，我希望前4个项目准备就绪。我试过以下：

GridLayoutManager glm = new GridLayoutManager(this, Tools.isScreenLandscape(this) ? 3 : 2, GridLayoutManager.VERTICAL, false)
{
    boolean mTutorialHandled = false;

    @Override
    public void onLayoutChildren(final RecyclerView.Recycler recycler, final RecyclerView.State state)
    {
        super.onLayoutChildren(recycler, state);
        // make sure, at least the first 4 views are ready
        if (!mTutorialHandled)
        {
            boolean allViewsReady = true;
            for (int i = 0; i < 4; i++)
                allViewsReady &= recycler.getViewForPosition(i) != null;
            if (allViewsReady)
            {
                TutorialManager.checkTutorial(false, savedInstanceState, MainActivity.this, mBinding);
                mTutorialHandled = true;
            }
        }
    }
};

但这不起作用。任何人都知道如何知道RecyclerView的前n个视图何时准备就绪？