Android-ViewPager-OnPageChangeListener

ViewPager 设定页面变化监听，用于在页面变换时请求服务器，更新页面

方法：

 1 mViewPager.setOnPageChangeListener(new OnPageChangeListerer () {
 2
 3         @Override
 4         public void onPageSelected(int position) {
 5             mPagerList.get(position).initData();
 6         }
 7
 8         @Override
 9         public void onPageScrolled(int position, float positionOffset, float positionOffsetPixels){
10
11         }
12
13         @Override
14         public void onPageScrolledStateChanged(int state) {
15
16         }
17
18 }