Imageloader, listview.notifyDataSetChanged刷新问题，图片闪烁

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我在项目中，用了ImageLoader来显示图片，这样引出一个问题，偶尔在我调用notifyDataSetChanged这个方法时候，图片全部闪烁一下，原因是图片全部重新加载了一次，导致闪烁。

下面是我之前的getView方法中。下面的ImageLoader直接调用，造成每次notifyDataSetChanged，重新调用了ImageLoader方法。

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.item_app_wall2, parent, false);
holder = new ViewHolder();
holder.icon = (ImageView) convertView.findViewById(R.id.app_icon);
holder.name = (MarqueeText) convertView.findViewById(R.id.app_name);
// holder.grade = (ImageView)
// convertView.findViewById(R.id.grade);
holder.size = (TextView) convertView.findViewById(R.id.app_size);
holder.count = (TextView) convertView.findViewById(R.id.app_count);
holder.ratingBar = (RatingBar) convertView.findViewById(R.id.grade);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}

ImageLoader.getInstance().displayImage(searchAppList.get(position).getHttpIco(), holder.icon,
DisplayImageOptionUtil.getInstance().getOptions());

holder.name.setText(searchAppList.get(position).getName().trim());
holder.size.setText(CommonUtil.format(searchAppList.get(position).getApkSize() / (float) 1024) + "M");
AppStatistics statistics = searchAppList.get(position).getAppStatistics();
if (statistics != null) {

holder.count.setText(statistics.getDownloadCount() + "次");
}
holder.ratingBar.setRating(searchAppList.get(position).getAveccore() / 2f);

return convertView;
}

下面我做出了修改，如果当前图片是之前的图片，则不会调用ImageLoader，否则调用ImageLoader。

public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.item_app_wall2, parent, false);
holder = new ViewHolder();
holder.icon = (ImageView) convertView.findViewById(R.id.app_icon);
holder.name = (MarqueeText) convertView.findViewById(R.id.app_name);
// holder.grade = (ImageView)
// convertView.findViewById(R.id.grade);
holder.size = (TextView) convertView.findViewById(R.id.app_size);
holder.count = (TextView) convertView.findViewById(R.id.app_count);
holder.ratingBar = (RatingBar) convertView.findViewById(R.id.grade);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}

if (searchAppList.get(position).getHttpIco().equals(holder.icon.getTag())) {

} else {
// 如果不相同，就加载。现在在这里来改变闪烁的情况
ImageLoader.getInstance().displayImage(searchAppList.get(position).getHttpIco(), holder.icon,
DisplayImageOptionUtil.getInstance().getOptions());
holder.icon.setTag(searchAppList.get(position).getHttpIco());
}

holder.name.setText(searchAppList.get(position).getName().trim());
holder.size.setText(CommonUtil.format(searchAppList.get(position).getApkSize() / (float)1024) + "M");
AppStatistics statistics = searchAppList.get(position).getAppStatistics();
if (statistics != null) {

holder.count.setText(statistics.getDownloadCount() + "次");
}
holder.ratingBar.setRating(searchAppList.get(position).getAveccore() / 2f);
return convertView;
}

通过ImageView.getTag和setTag方法来，判定当前图片是否是之前的，如果是之前，则不会刷新图片，如果不是，再刷新。