Android Question Download Progress and Cancel

You should use OkHttpUtils2 and you don't need to modify it. You don't need DownloadService. You should use B4XPages.
The RangeDownloader is a good solution for large files: https://www.b4x.com/android/forum/threads/b4x-rangedownloader-resumable-downloads.133370/

The best way to cancel ongoing requests is with RequestsManager class. You can find it inside SimpleMediaManager.b4xlib. It is cross platform and works with OkHttpUtils2 / iHttpUtils2. Note that you need to add HU2_PUBLIC to the build configuration.

Erel said:

You should use B4XPages.

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Unfortunately it is an old app developed more than 10 years ago.
It is too tedious to port it to B4XPages.
I am thinking to remove all the download parts entirely until users come back to me.