Why does my Android transition ignore the TransitionListener?

Question

I\'m trying to make a smoothly-updating display by calling TransitionManager.beginDelayedTransition(viewGroup, new AutoTransition()) before updating the display

Answer 1

I finally found the answer to my question.

I was calling TransitionManager.beginDelayedTransition on a FrameLayout which did not have children at the time I called, then I added a child.

This doesn't cause a transition to happen, and no callbacks are called.

I now check if the ViewGroup I'm calling beginDelayedTransition on has children before doing the call; if it doesn't, I don't bother trying to animate it.