public void setStrokeWidth(float strokeWidth) {
            mStrokeWidth = strokeWidth;
            mArcPaint.setStrokeWidth(strokeWidth);
            invalidateSelf();
        }
@param strokeWidth Set the stroke width of the progress spinner in pixels.
common/src/main/java/com/sxjs/common/widget/pulltorefresh/header/MaterialProgressDrawable.java