/** * This method will be invoked when the current page is scrolled, either as part of a * programmatically initiated smooth scroll or a user initiated touch scroll. If you override this * method you must call through to the superclass implementation (e.g. * super.onPageScrolled(position, offset, offsetPixels)) before onPageScrolled returns. * * @param position Position index of the first page currently being displayed. Page position+1 * will be visible if positionOffset is nonzero. * @param offset Value from [0, 1) indicating the offset from the page at position. * @param offsetPixels Value in pixels indicating the offset from position. */ protected void onPageScrolled(int position, float offset, int offsetPixels) { if (mOnPageChangeListener != null) { mOnPageChangeListener.onPageScrolled(position, offset, offsetPixels); } if (mInternalPageChangeListener != null) { mInternalPageChangeListener.onPageScrolled(position, offset, offsetPixels); } }