BulkDownloader
You can use this Downloader, where:
You want to download 100's of images in background
You want progress of each file being downloaded and total images downloaded.
What this can do:
You can download bunch of images in a go
-You can assign n number of downloading tasks and this library can handle this pretty well
You can assign 10 downloading jobs that has 100s of images each, each downloading batch gives you progress and as well as each image progress in percentage
Let's say you