Wrong progress values

[HugoHeneault]

With this code I have weird values coming up in progress listener:

    final dl = DownloadManager();
    final urls = <String>[];
    
    for (final offlineTile in tiles) {
      urls.add(offlineTile.url);
      await dl.addDownload(offlineTile.url, offlineTile.getTilePath(tilesDir!));
    }

    print(urls);

    final downloadProgress = dl.getBatchDownloadProgress(urls);

    downloadProgress.addListener(() {
      print('progress : ${downloadProgress.value}');
    });

    await dl.whenBatchDownloadsComplete(urls);
    print('whenBatchDownloadsComplete completed');

This log a few negative (and < 100) values but also the correct value everytime :

flutter: tiles downloading...
flutter: Concurrent workers: 1
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/0/0/0.vector.pbf?apikey=xxx
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/1/0/0.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/2/1/0.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/3/2/1.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/4/4/2.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/5/8/5.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/6/16/11.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/7/33/22.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/8/66/45.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/9/132/91.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/10/264/183.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/11/528/367.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/12/1057/735.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/13/2114/1471.vector.pbf?apikey=xxx
flutter: File Exists
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/13/2115/1471.vector.pbf?apikey=xxx
flutter: [https://a.tile.thunderforest.com/thunderforest.outdoors-v2/0/0/0.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/1/0/0.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/2/1/0.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/3/2/1.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/4/4/2.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/5/8/5.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/6/16/11.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/7/33/22.vector.pbf?apikey=xxx, https://a.tile.thunderforest.com/thunderforest.outdoors-v2/<…>
flutter: progress : -300.94736842105266
flutter: progress : 0.7368421052631579
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/14/4229/2942.vector.pbf?apikey=xxx
flutter: progress : -309.1578947368421
flutter: progress : 0.7894736842105263
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/14/4229/2943.vector.pbf?apikey=xxx
flutter: progress : -122.84210526315789
flutter: progress : -286.1578947368421
flutter: progress : -162.47368421052633
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/14/4230/2942.vector.pbf?apikey=xxx
flutter: progress : 0.8947368421052632
flutter: Concurrent workers: 2
flutter: https://a.tile.thunderforest.com/thunderforest.outdoors-v2/14/4230/2943.vector.pbf?apikey=xxx
flutter: progress : -152.26315789473685
flutter: progress : 0.9473684210526315
flutter: progress : -89.15789473684211
flutter: progress : 1.0
flutter: whenBatchDownloadsComplete completed
flutter: download finished

Do you have any idea ?

it seems like in getBatchDownloadProgress we should return when
if (task.status.value.isCompleted) { instead of listening as it is already completed.

But I don't have more time to investigate now (client didnt ask for progress I was just trying it) :(

Thanks for your work and help!

[HugoHeneault]

As a workaround, I filter values < 0 :)