获取RecyclerView例如onCreateViewHolder设置PARAMS

好的球员，我需要找到一种方法，将距离改为上的RecyclerView方向变化上，因为它在水平和垂直方向的不同，我得到这个工作的项目，onBindViewHolder但我还需要设置为RecyclerView的参数，可以将下面的代码不起作用：获取RecyclerView例如onCreateViewHolder设置PARAMS

public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    final View view = this.layoutInflater.inflate(R.layout.row_item, parent, false); 
    // Create layout params for the RecyclerView 
    RecyclerView.LayoutParams params 
     = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 
              ViewGroup.LayoutParams.MATCH_PARENT); 
    // Set them margins 
    params.setMargins(0, spanCount * 500, 0, spanCount * 10); 
    // Get reference, this doesn't work 
    RecyclerView rv = (RecyclerView) parent.getChildAt(0); // Doesn't work 
    rv.setLayoutParams(params); // <- Throws NPE 
    return new ItemViewHolder(view); 
}

我也试着铸造RecyclerView父和看法，也不能工作。

来源

2016-05-17 octohedron