RecyclerView獲取ItemView方法實際比較簡單，直接用LayoutManager實例的方法：

// positions是RecyclerView中每個item的位置
View view = layoutManager.findViewByPosition(position);

但是在fragment中如果直接調(diào)用上面的方法，返回的view為空，我們需要用handler的postDelayed方法延遲獲取。

static Handler handler = new Handler(Looper.getMainLooper());

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    handler.postDelayed(runnable, 200);
}

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        View view = layoutManager.findViewByPosition(position);
    }
};