ListView scrolling lag in android

Question

I am having a customized list view in my application, which is showing an image and text. The Image I am getting from URL, using the code below:

private static Drawable ImageOperations(Context ctx, String url,
        String saveFilename) {
    try {
        InputStream is = (InputStream) fetch(url);
        Drawable d = Drawable.createFromStream(is, "src");
        return d;
    } catch (MalformedURLException e) {
        e.printStackTrace();
        return null;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

public static Object fetch(String address) throws MalformedURLException,
IOException {
    URL url = new URL(address);
    Object content = url.getContent();
    return content;
}

all is working perfect, except the list view scrolling, its very slow. If I disable the images, the scroll speed smooth-ens , but with the image enabled, it lags alot.

Is there any possible way I can reduce or remove this lagging?

Thanks

score 3 · Accepted Answer · answered Oct 12 '10 at 14:03

3

You need to do your fetching in the background. One of the examples you can use : http://android-developers.blogspot.com/2010/07/multithreading-for-performance.html

answered Oct 12 '10 at 14:03

Alex Volovoy

67,778
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score 2 · Answer 2 · edited Jun 11 '11 at 02:55

2

use this library for downloading images in background and caching.. it won't hurt the UI https://github.com/koush/UrlImageViewHelper

edited Jun 11 '11 at 02:55

koush

2,972
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answered Apr 20 '11 at 22:02

Vasile Surdu

1,203
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11

score 1 · Answer 3 · edited May 23 '17 at 12:05

1

Are you lazy loading your images? See this question for details.

edited May 23 '17 at 12:05

Community

1
1

answered Oct 12 '10 at 14:03

Bryan Denny

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ListView scrolling lag in android

3 Answers3