如何使用asynctask获取多个url位图

Question

我想用Asynctask下载许多位图文件。 （此位图位于网络上）

如果那么我该怎么办呢？

private ArrayList<String> bitmapUrls;
private ArrayList<Bitmap> bitarray;

.. bitmapUrls.add("Here's my bitmap url"); x 10 ..

public class DownloadImages extends AsyncTask<Void, Void, Bitmap> {

    @Override
    protected Bitmap doInBackground(Void... params) {

        Bitmap bitmap = null;
        for(String biturl:bitmapUrls){
            bitmap = downloadBitmap(biturl);
            return bitmap;
        }
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        bitarray.add(result);
    }

    public Bitmap downloadBitmap(String url) {
        final AndroidHttpClient client = AndroidHttpClient
                .newInstance("Android");
        final HttpGet getRequest = new HttpGet(url);

        try {
            HttpResponse response = client.execute(getRequest);
            final int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                Log.w("ImageDownloader", "Error " + statusCode
                        + " while retrieving bitmap from " + url);
                return null;
            }

            final HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream inputStream = null;
                try {
                    inputStream = entity.getContent();
                    final Bitmap bitmap = BitmapFactory
                            .decodeStream(inputStream);


                    return bitmap;
                } finally {
                    if (inputStream != null) {
                        inputStream.close();
                    }
                    entity.consumeContent();
                }
            }
        } catch (Exception e) {
            getRequest.abort();
        } finally {
            if (client != null) {
                client.close();
            }
        }
        return null;
    }

}

如您所见，我真的想在我的代码中获取bitarray结果数组。 请给我一个改进这个东西代码的建议。