private void notifyFinishedToListener() {
        if (mMarkerListener != null) {
            if (mReverse) {
                mMarkerListener.onClosingComplete();
            } else {
                mMarkerListener.onOpeningComplete();
            }
        }
    }
The two colors that will be used for the seek thumb.

@param startColor Color used for the seek thumb
@param endColor   Color used for popup indicator
caprice/ui/src/main/java/net/qiujuer/genius/ui/drawable/BalloonMarkerDrawable.java