如何使用ViewTreeObserver.OnGlobalLayoutListener（）从回收者视图项目访问图像视图

Question

 RecyclerView.ViewHolder imageViewDrawerIcon;
    public void  childOFrecyclerView(){
        int childCount = myRecyclerView.getChildCount();
        Log.d("Countttt","Count"+childCount);
        myRecyclerView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                for(int i=0;i<=childCount;i++)
                 imageViewDrawerIcon = myRecyclerView.findViewHolderForAdapterPosition(i);
                if(imageViewDrawerIcon.itemView instanceof MyView){
                    imageViewDrawerIcon.itemView.findViewById(R.id.my_imageview).setVisibility(View.GONE);
                }  
            }
        });
    }

我在Recycler视图中有10个项目视图。我必须访问id为的imageview my_imageview，但我得到了：

  

android.view.View   android.support.v7.widget.RecyclerView $ ViewHolder.itemView'上为null   对象引用

请建议如何从Android的Recycler视图获取ItemView图像视图。