How to check at runtime if an imageview came from a local or remote resource?

Question

If I'm running as a third party library within an android application, and I want to check whether the imageviews on screen were loaded from locally bundled resources or were loaded from a remote uri - is there a way of doing this at runtime? Is there perhaps some clue in the view tree that would help me group the imageviews into these two broad categories? I see that the uri field itself isn't providing anything useful by reflection. I can ask developers to tag the imageviews but that creates a substantial overhead for them that I prefer to avoid.

Answer 1

No. ImageViews hold Drawables. The view has no idea where that drawable came from. It doesn't even know what type of Drawable it is.

Also, using setImageUri to show a remote image is generally a code smell- that causes it to request and decode on the UI thread, which can be a cause of performance issues. You should never be doing that, and use an external image cache to download images and properly thread things. There's a few large image libraries out there that do it for you (Glide and Picasso being the big two)