切换时指示器跟随滚动

咱老师想复杂啦，下面是我的测试代码：

public void onPageScrolled(int position, float positionOffSet, int positionOffSetPx) {

                int marginLeft = (int) (position * separateWidth + positionOffSet * separateWidth);

                Log.i(tag,"margin left: " + marginLeft);

                LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) iv_separate.getLayoutParams();

                layoutParams.leftMargin = marginLeft;

                iv_separate.setLayoutParams(layoutParams);

            }