无法解码流：fileNotFoundException

Question

基本上，我使用 DOM Parser 从列表视图中的 RSS 提要中检索标题、描述、pubDate 和缩略图。这是我的示例代码。

 public ArrayList<HashMap<String, String>> processXML(
                InputStream inputStream) throws Exception {
                DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
                .newInstance();
                DocumentBuilder documentBuilder = documentBuilderFactory
                .newDocumentBuilder();
                Document xmlDocument = documentBuilder.parse(inputStream);
                Element rootElement = xmlDocument.getDocumentElement();
                L.m("" + rootElement.getTagName());
                NodeList itemsList = rootElement.getElementsByTagName("item");
                NodeList itemChildren = null;
                Node currentItem = null;
                Node currentChild = null;
                NamedNodeMap mediaThumbnailAttr = null;
                Node currentAttribute=null;
                int count = 0;
                ArrayList<HashMap<String, String>> results = new ArrayList<>();
                HashMap<String, String> currentMap = null;
                for (int i = 0; i < itemsList.getLength(); i++) {
                currentItem = itemsList.item(i);
                itemChildren = currentItem.getChildNodes();
                currentMap = new HashMap<>();
                for (int j = 0; j < itemChildren.getLength(); j++) {
                currentChild = itemChildren.item(j);
                if (currentChild.getNodeName().equalsIgnoreCase("title")) {
                // L.m(currentChild.getTextContent());
                currentMap.put("title", currentChild.getTextContent());
                }
                if (currentChild.getNodeName().equalsIgnoreCase("pubDate")) {
                // L.m(currentChild.getTextContent());
                currentMap
                .put("pubDate", currentChild.getTextContent());
                }
                if (currentChild.getNodeName().equalsIgnoreCase(
                "description")) {
                // L.m(currentChild.getTextContent());
                currentMap.put("description",
                currentChild.getTextContent());
                }

                if(currentChild.getNodeName().equalsIgnoreCase("media:thumbnail")){
                    //L.m(""+currentChild.getTextContent());
                    mediaThumbnailAttr = currentChild.getAttributes();
                    for(int k=0;k<mediaThumbnailAttr.getLength();
                            k++){
                        currentAttribute = mediaThumbnailAttr.item(k);
                        if(currentAttribute.getNodeName()
                                .equalsIgnoreCase("url")){
                            count++;

                            //L.m(currentChild.getAttributes().item(0).getTextContent());

                        }
                       //L.m();
                       currentMap.put("imageURL", currentChild
                .getAttributes().item(0).getTextContent());
                    }
                    count=0;
                }
                }
                if (currentMap != null && !currentMap.isEmpty()) {
                results.add(currentMap);
                }
                count = 0;
                }
                return results;
                }
                }
        }

我的解析器正确读取了前三个标签..但是缩略图给了我一个问题，并引发了一个异常...

        Unable to decode stream: java.io.FileNotFoundException:   
           /http:/i.dailymail.co.uk/i/pix/2014/09/27/1411832985119_Puff_Image_galleryImage_SUNDERLAND_ENGLAND_SEPTEM.JPG: open failed: ENOENT (No such file or directory).

有什么问题吗 setImageURI(Uri.parse(currentItem.get("imageURL")));

Answer 1

错误是：

Unable to decode stream: java.io.FileNotFoundException:   
       /http:/i.dailymail.co.uk/i/pix/2014/09/27/1411832985119_Puff_Image_galleryImage_SUNDERLAND_ENGLAND_SEPTEM.JPG: open failed: ENOENT (No such file or directory).

在 URL 开始前查看“/”。这导致了FileNotFoundException。因此，首先，请确保您在回复中获得正确的 URL。

对于测试，请尝试使用硬编码的 url：

holder.articleImage.setImageURI(Uri.parse("http:/i.dailymail.co.uk/i/pix/2014/0‌​9/27/1411832985119_Puff_Image_galleryImage_SUNDERLAND_ENGLAND_SEPTEM.JPG"));

我想这应该可以正常工作。因此，只需在响应中进行更正，您就可以开始了。

Answer 2

是的。你是对的！！！我必须创建一个单独的 AsyncTask 来下载图像..

 public class ImageDownloader extends AsyncTask<String, String, Bitmap> {

   private MyAdapter parentActivity;


   public ImageDownloader(MyAdapter parentActivity) {
    super();

    this.parentActivity = parentActivity;
 }

  protected Bitmap doInBackground(String... args) {
    try {
        Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(args[0]).getContent());
        return bitmap;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
 }

   protected void onPostExecute(Bitmap image) {
    if(image != null){
        parentActivity.updateBitmap(image);

    }
  }
}

还有

   new ImageDownloader(MyAdapter.this).execute(currentItem.get("imageURL"));

获取图像并将它们显示到列表中。谢谢你的想法。他们帮了我很多！