public void setTrackColor(ColorStateList stateList) {
        mTrackStateList = stateList;
        mTrackColor = mTrackStateList.getDefaultColor();
        if (mAlpha < 255) {
            mCurTrackColor = Ui.modulateColorAlpha(mTrackColor, mAlpha);
        } else {
            mCurTrackColor = mTrackColor;
        }
    }
Set the Track ColorStateList

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