獲取RecyclerView例如onCreateViewHolder設置PARAMS

好的球員，我需要找到一種方法，將距離改爲上的RecyclerView方向變化上，因爲它在水平和垂直方向的不同，我得到這個工作的項目，onBindViewHolder但我還需要設置爲RecyclerView的參數，可以將下面的代碼不起作用：獲取RecyclerView例如onCreateViewHolder設置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); 
}

我也試着鑄造RecyclerView父和看法，也不能工作。

來源

2016-05-17 octohedron