collection of android UI libraries
https://medium.com/better-programming/30-best-android-libraries-and-projects-of-2019-a1e35124f110
https://github.com/umano/AndroidSlidingUpPanel
https://github.com/wdullaer/MaterialDateTimePicker
https://github.com/wasabeef/awesome-android-ui
https://github.com/Ramotion/android-ui-animation-components-and-libraries