I am trying to develop a custom component i.e. arc slider, I am done with the arc and the thumb but not able to figure out how can I draw the rounded edge arc and also the embos
You are using path to draw the arc. Use CornerPathEffect to round the corners. Example here CornerPathEffect example.
And here is the example for embossed effect. I'm not sure if it is what you want. Embossed effect example