Visually indicate where the transcoded resource was coming from

[TWiStErRob]

There should be an optionally available way of displaying an indicator on the target which tells you any feasible combination of these:

• it was downloaded from the network
• it was loaded from disk cache
• it was loaded from memory cache
• it was just put into disk cache
• it was just put into memory cache
• it's a thumbnail
• it's a placeholder

[technoir42]

Here is my idea how to implement this https://gist.github.com/technoir42/7b1ed8029178f7c92963d46547997e84. The downside is that enabling indicator disables the default transitions.

[TWiStErRob]

Wow, that's pretty neat! With a bit of refactoring you can get it to wrap the default behavior (have it receive an instance of another factory and delegate).

If you're not afraid of hacking around you may even make it wrap the "current" factory regardless of what it is: put the extension on DrawableTransitionOptions and use (not recommended, but possible ;) https://github.com/bumptech/glide/blob/master/library/src/main/java/com/bumptech/glide/TransitionOptions.java#L91; with a static boolean to toggle factories in build you may even turn it on/off globally.