Android异步图片下载后如何更改列表项布局

public class CustomAdapter extends ArrayAdapter<String> {
    private Context context;
    private List<String> imageUrls;

    public CustomAdapter(Context context, List<String> imageUrls) {
        super(context, R.layout.list_item, imageUrls);
        this.context = context;
        this.imageUrls = imageUrls;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(context);
            convertView = inflater.inflate(R.layout.list_item, parent, false);

            holder = new ViewHolder();
            holder.imageView = convertView.findViewById(R.id.image_view);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        String imageUrl = imageUrls.get(position);

        // 使用异步任务下载图片并设置到ImageView中
        ImageDownloaderTask task = new ImageDownloaderTask(holder.imageView);
        task.execute(imageUrl);

        return convertView;
    }

    private static class ViewHolder {
        ImageView imageView;
    }

    private class ImageDownloaderTask extends AsyncTask<String, Void, Bitmap> {
        private ImageView imageView;

        public ImageDownloaderTask(ImageView imageView) {
            this.imageView = imageView;
        }

        @Override
        protected Bitmap doInBackground(String... urls) {
            String imageUrl = urls[0];
            Bitmap bitmap = null;

            // 使用网络请求库下载图片
            // 这里仅作示例，实际使用时可以根据需求选择合适的网络请求库
            try {
                URL url = new URL(imageUrl);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setDoInput(true);
                connection.connect();
                InputStream input = connection.getInputStream();
                bitmap = BitmapFactory.decodeStream(input);
            } catch (IOException e) {
                e.printStackTrace();
            }

            return bitmap;
        }

        @Override
        protected void onPostExecute(Bitmap bitmap) {
            if (bitmap != null) {
                // 将下载好的图片设置到ImageView中
                imageView.setImageBitmap(bitmap);
            }
        }
    }
}