GridView动态设置条目宽高，第一个条目显示不清晰或不完整的问题

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder ;
if (convertView == null) {
convertView = View.inflate(context, R.layout.entry_list, null);
int px = DensityUtils.dip2px(context, 1f);
int ColumnWidth = (width - 4 * px) / 3;
AbsListView.LayoutParams param = new AbsListView.LayoutParams(ColumnWidth, ColumnWidth);
convertView.setLayoutParams(param);
holder = new ViewHolder();
holder.iv1 = (ImageView) convertView.findViewById(R.id.entry_img1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
return convertView;
}