How to manually play animation again when returned from back stack

[darek607]

Thanks for this library!

I encountered a strange bug and spent quite much time to ivestigate the issue. I wanted to play animation manually every time fragment view is loaded (onViewCreated).

Steps:

1. Inside onViewCreated of Fragment A, set progress to 0 and call playAnimation
2. Navigate to Fragment B with back stack entry and press back in order to return to the A

Expected result:
The animation should play again.

Result: The animation usually don't animate again after navigating back to fragment A. It shows a fully loaded anim immediately.

Tested on 3.7.1 and 3.2.2 versions.

[darek607]

It seems that lottie view incorrectly handles the saved state. The issue is gone after adding
android:saveEnabled="false" for the LottieAnimationView.

Previously I though that adding addLottieOnCompositionLoadedListener solves the issue, but it solves it only partially - the bug still sometimes happened (in about 1 per 10 Fragment loads).

[gpeal]

@darek607 Can you attach a sample project that reproduces this?

[darek607]

@gpeal I've created a basic sample demonstrating the issue: https://github.com/darek607/Lottie-Android-Bug

1. Run the app (animation should play successfully)
2. Click NEXT button to launch another fragment
3. Go back to animation fragment (anim won't play again, but it should)