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原因：
一般在 Item 的根布局中会设置marginTop 或者 marginBottom，因此不能解决这个问题，所以我们的view.gone还是会占位
解决代码：

class ViewHolder extends RecyclerView.ViewHolder {

    ViewHolder(View itemView) {
        super(itemView);
    }

    public void setVisibility(boolean visible) {
        RecyclerView.LayoutParams param = (RecyclerView.LayoutParams) itemView.getLayoutParams();
        if (visible) {
            param.height = LinearLayout.LayoutParams.WRAP_CONTENT;
            param.width = LinearLayout.LayoutParams.MATCH_PARENT;
            itemView.setVisibility(View.VISIBLE);
        } else {
            itemView.setVisibility(View.GONE);
            param.height = 0;
            param.width = 0;
        }
        itemView.setLayoutParams(param);
    }
}