Retrofit + rxjava implementation downloads files with progress

Retrofit + rxjava is already the most mainstream network framework in the market. It is very easy to use it for ordinary network requests. I have also used retrofit to upload and download files before, but I found that using retrofit to download does not support progress callback by default, but the product greatly requires that the download progress be displayed when downloading files, so I have to study it deeply.

Next, let's package together and use retrofit + rxjava to download files with progress.

github：JsDownload