Where can I find examples of implementing such effects for Android?

Question

Java

Where can I find freely available examples of UI implementations with such effects:

• Material Design Curtain Menu Animation
  
• power chart
  

Preferably native source code with examples and descriptions (comments).

Answer 1

Material Design Curtain Menu Animation

Answer 2

Power Chart - https://github.com/yamblz-native/labs-ui-power-chart