I use uiautomatorviewer to quickly get resource-ids to create acceptance tests, but in the past few weeks, I noticed that the field is no longer present. I'm unsure whether it's something on my end, or the tool that changed.
Previously, I could view the resource-id of an element:
Now, the resource-id field is no longer present (the element selected does have an id):
I just updated to Android SDK Tools 22.3, but this was happening before the update. Unfortunately, I didn't take note of what version this started happening in. :/