Open source library in Github:
https://github.com/imandolatkia/Android-Animated-Theme-Manager

Features:
- support java and kotlin projects.
- change theme without recreating activities and fragments.
- support multi fragments apps.
- ripple animation.
- reverse animation.
- changeable animation duration.
- changeable animation position.
- animation listener.
- observe changes of themes for custom actions with Livedata.
- easy to use, 5 or 7 tiny steps.
- support any android APIs (animation works on API>20).