@Override
    public void draw(Canvas canvas, Paint paint) {
        if (!mPath.isEmpty()) {
            paint.setColor(mCurColor);
            canvas.drawPath(mPath, paint);
        }
    }
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