code: @SuppressWarnings("unused")
      public void setPosition(double pos) {
          if (pos >= 0 && pos <= 1) {
              mAngle = mStartAngle + pos * 2 * Math.PI;
          }
      }
docs: Position setter. This method should be used to manually position the slider thumb.<br>
  Note that counterclockwise {@link #mStartAngle} is used to determine the initial thumb position.
  
  @param pos Value between 0 and 1 used to calculate the angle. {@code Angle = StartingAngle + pos * 2 * Pi}<br>
  Note that angle will not be updated if the position parameter is not in the valid range [0..1]