java - 位图内存不足错误

Question

我对此错误有疑问。

我从 URL 制作 favicon 解析器。我这样做是这样的:

public class GrabIconsFromWebPage {
public static String replaceUrl(String url) {
    StringBuffer sb = new StringBuffer();
    Pattern p = Pattern.compile("https?://.+\\..+?\\/");
    Matcher m = p.matcher(url);
    while (m.find()) {
        sb.append(m.group());
    }
    return sb.toString();
}

public static String getFavicon(String url) throws IOException {
    try {
        Document doc = Jsoup.connect(url).get();
        Element element = doc.head().select("link[href~=.*\\.(ico|png)]").first();
        if (element != null) {
            if (element.attr("href").substring(0, 2).contains("//")) {
                return "http:" + element.attr("href");
            } else if (element.attr("href").substring(0, 4).contains("http")) {
                return element.attr("href");
            } else {
                return replaceUrl(url) + element.attr("href");
            }
        } else {
            return "";
        }
    } catch(IllegalArgumentException ex) {
        ex.printStackTrace();
    } catch(OutOfMemoryError er) {
        er.printStackTrace();
    }
    return "";
}

public static Bitmap getBitmapFromURL(String src) {
    try {
        URL url = new URL(src);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

}

以及如何从 url 获取位图

Bitmap faviconBitmap = GrabIconsFromWebPage.getBitmapFromURL(
                                GrabIconsFromWebPage.getFavicon(
                                        bookmarkData.get(position).getUrl() // url from which I want to grab favicon
                                )
                        );

上传 20 张图片后，这段代码给了我 OutOfMemoryError 错误。我怎样才能解决这个问题？或者优化？因为在我显示此图标的列表中，可以有超过 20 或 40 个图标...

Answer 1

我想，你会使用universal image loader

给定代码 fragment 的方法

// Load image, decode it to Bitmap and return Bitmap synchronously 
ImageSize targetSize = new ImageSize(80, 50); 
// result Bitmap will be fit to this size
Bitmap bmp = imageLoader.loadImageSync(imageUri, targetSize, options);

对于内存不足的情况，您可以在 list 文件中添加一行

<application
        ...
        android:largeHeap="true"
        ...
        >
</application>