Android 从URL下载图像时出现问题

我使用以下代码从URL下载图像：

public static Bitmap downloadImage(String url) {
        Bitmap bitmap = null;
        InputStream in = null;
        BufferedOutputStream out = null;

        try {
            in = new BufferedInputStream(new URL(url).openStream(), IO_BUFFER_SIZE);

            final ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
            out = new BufferedOutputStream(dataStream, IO_BUFFER_SIZE);
            copy(in, out);
            out.flush();

            final byte[] data = dataStream.toByteArray();
            BitmapFactory.Options options = new BitmapFactory.Options();

            bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,options);
        } catch (IOException e) {
            Log.e(TAG, "Could not load Bitmap from: " + url);
        } finally {
            closeStream(in);
            closeStream(out);
        }

        return bitmap;
    }

当我发送URL时“http://java.sogeti.nl/JavaBlog/wp-content/uploads/2009/04/android_icon_256.png“它很好用，但当我使用”http://www.hospimedica.com/images/stories/articles/article_images/_CC/20110328%20-%20DJB146.gif“它返回空值。

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此URL有什么问题？

为什么要编写自己的方法来下载图像？Android内置了实现这一点的方法。。只用

URL url = new URL("Your url");
Bitmap bitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream());

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它也不起作用。URL有点问题，但我不知道到底是什么，可能是因为URL中有空格？它不会引发异常。只需在bitmapSee中返回null，请参见此处的解决方案