Getting image preview with android library or via WebDAV

Crafter · March 29, 2020, 1:55pm

Hello together,
I’m currently experimenting with the android-library (com.github.nextcloud:android-library) and download of images. I want to show a preview of some pictures, but don’t want to download the whole large image for that. Is it possible to get the generated previews or thumbnails from nextcloud or request images in a specific size?
I’m currently working with the android-library but would be interested in a WebDAV based solution too.

thank you

kesselb · March 29, 2020, 3:10pm

cc @tobiasKaminsky

tobiasKaminsky · March 30, 2020, 4:24am

For thumbnails (square):

github.com

nextcloud/android/blob/0569b0de6543bfaf78d689c8b4296ca24fc2bdd3/src/main/java/com/owncloud/android/datamodel/ThumbnailsCacheManager.java#L590-L591


uri = mClient.getBaseUri() + "/index.php/apps/files/api/v1/thumbnail/" +
        pxW + "/" + pxH + Uri.encode(file.getRemotePath(), "/");

For resized images (correct side ratio):

github.com

nextcloud/android/blob/0569b0de6543bfaf78d689c8b4296ca24fc2bdd3/src/main/java/com/owncloud/android/datamodel/ThumbnailsCacheManager.java#L316-L318


String uri = mClient.getBaseUri() + "/index.php/core/preview.png?file="
        + URLEncoder.encode(file.getRemotePath())
        + "&x=" + pxW + "&y=" + pxH + "&a=1&mode=cover&forceIcon=0";

vauvenal5 · June 8, 2020, 7:19am

Is this API documented somewhere?

joho68 · October 5, 2020, 7:28pm

Are there WebDAV endpoints for this data as well?