How would I implement a swipe-based circular control like this?

Question

I am working on an Android application, and I have a TextView where I display a price (for example 50$).

I would like to have a circular control similar to this picture:

Answer 1

you need to use Circular SeekBar you can find sample and librery from here

some another also may usefull here , this.

thanx i hope it helps.