public void setThumbColor(int startColor, int endColor) {
        mSeekBarDrawable.setThumbColor(ColorStateList.valueOf(startColor));
        if (mIndicator != null)
            mIndicator.setColors(startColor, endColor);
    }
Sets the color of the seek thumb, as well as the color of the popup indicator.

@param startColor The color the seek thumb will be changed to
@param endColor   The color the popup indicator will be changed to
caprice/ui/src/main/java/net/qiujuer/genius/ui/widget/AbsSeekBar.java