@Override
    public void start() {
        mAnimation.reset();
        mRing.storeOriginals();
        // Already showing some part of the ring
        if (mRing.getEndTrim() != mRing.getStartTrim()) {
            mParent.startAnimation(mFinishAnimation);
        } else {
            mRing.setColorIndex(0);
            mRing.resetOriginals();
            mParent.startAnimation(mAnimation);
        }
    }
Set the colors used in the progress animation from color resources.
The first color will also be the color of the bar that grows in response
to a user swipe gesture.

@param colors
ptr-lib/src/in/srain/cube/views/ptr/header/MaterialProgressDrawable.java