为了在我的 ListView 中显示和加载图像,我创建了一个自定义 ArrayAdapter,但是它真的很慢。每次我滚动列表时,它都会再次加载图像。
是否有缓存机制可以缓存我的视图,这样我就不需要每次都重新填充它们?我知道 ViewHolder 方法,但是这仍然很慢还是我只是用错了?
我的代码:
public class ImageArrayAdapter extends ArrayAdapter<HashMap<String, String>> {
private int resourceId = 0;
private LayoutInflater inflater;
public ImageArrayAdapter(Context context, int resource,
List<HashMap<String, String>> objects) {
super(context, 0, objects);
this.resourceId = resource;
this.inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public static class ViewHolder {
public TextView title;
public TextView text;
public WebImageView image;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
ViewHolder holder;
if (view == null) {
view = inflater.inflate(resourceId, parent, false);
holder = new ViewHolder();
holder.text = (TextView) view.findViewById(R.id.item_text);
holder.image = (WebImageView) view.findViewById(R.id.item_image);
holder.title = (TextView) view.findViewById(R.id.item_title);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
HashMap<String, String> item = (HashMap<String, String>) getItem(position);
holder.text.setText(item.get("text"));
holder.title.setText(item.get("title"));
holder.image.setImageUrl(item.get("image"));
holder.image.loadImage();
return view;
}
}