public void setThumbColor(ColorStateList stateList) {
        mThumbStateList = stateList;
        mThumbColor = mThumbStateList.getDefaultColor();

        if (mAlpha < 255) {
            mCurThumbColor = Ui.modulateColorAlpha(mThumbColor, mAlpha);
        } else {
            mCurThumbColor = mThumbColor;
        }
    }
Set the Thumb ColorStateList

@param stateList ColorStateList
caprice/ui/src/main/java/net/qiujuer/genius/ui/drawable/SeekBarStateDrawable.java