android ViewPager之OnPageChangeListener接口

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 项目中在使用ViewPager的时候，一般都要在界面滑动的时候做一些事情，android中有个专门的状态回调接口OnPageChangeListener。

/**
* Callback interface for responding to changing state of the selected page.
*/
public interface OnPageChangeListener {

/**
* 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.
*
* @param position Position index of the first page currently being displayed.
* Page position+1 will be visible if positionOffset is nonzero.
* @param positionOffset Value from [0, 1) indicating the offset from the page at position.
* @param positionOffsetPixels Value in pixels indicating the offset from position.
*/
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels);

/**
* This method will be invoked when a new page becomes selected. Animation is not
* necessarily complete.
*
* @param position Position index of the new selected page.
*/
public void onPageSelected(int position);

/**
* Called when the scroll state changes. Useful for discovering when the user
* begins dragging, when the pager is automatically settling to the current page,
* or when it is fully stopped/idle.
*
* @param state The new scroll state.
* @see ViewPager#SCROLL_STATE_IDLE
* @see ViewPager#SCROLL_STATE_DRAGGING
* @see ViewPager#SCROLL_STATE_SETTLING
*/
public void onPageScrollStateChanged(int state);
}

android ViewPager之OnPageChangeListener接口

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原文地址：http://www.cnblogs.com/Theone2014/p/4748569.html