public void convertFrom(PtrIndicator ptrSlider) {
        mCurrentPos = ptrSlider.mCurrentPos;
        mLastPos = ptrSlider.mLastPos;
        mHeaderHeight = ptrSlider.mHeaderHeight;
    }
Update current position before update the UI
common/src/main/java/com/sxjs/common/widget/pulltorefresh/indicator/PtrIndicator.java