Some guide to add preload image when i load an external url?


Hi, I’m new here, and my english is no so good. I’m very excited with this framework (supersonic) and I already made 2 apps with almost no effort, but right now I’m tweaking apps and getting better with the tools.
I noticed when I try to load an external url there is no loader, spinner or something that indicate to user that the page is loading. I already look further in docs, etc but almost every topic about this is deprecated and send me to another guides that does not exist. There are some basic guide with preloadres, spinners, etc using Supersonic with Android build? Thanks in advance.