Exception Log:##

java.lang.IllegalStateException:   
The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! 
Expected adapter item count: 4, found: 13 Pager id: <PackageName>:id/view_pager Pager class:class 
com.geo.smallcredit.view.loopingpager.LoopViewPager Problematic adapter: 
class com.geo.smallcredit.view.loopingpager.LoopPagerAdapterWrapper

應(yīng)用程序的 PagerAdapter 更改適配器的內(nèi)容而無需調(diào)用 PagerAdapter #notifyDataSetChanged ！
系統(tǒng)跟蹤count的值，如果這個(gè)值和getCount返回的值不一致，就會(huì)拋出這個(gè)異常。

另外如果你使用了LoopingViewPager這個(gè)使用包裝設(shè)計(jì)方式實(shí)現(xiàn)無限循環(huán)的ViewPager的話，是不能通過notifyDataSetChanged方法來刷新數(shù)據(jù)的，因?yàn)槊看握嬲腜agerAdapter中的 N [N=adapter.getCount()]和mExpectedAdapterCount是不相等的
報(bào)錯(cuò)處：

void populate(int newCurrentItem){
   ...
   #final int N = mAdapter.getCount();#
   final int endPos = Math.min(N-1, mCurItem + pageLimit);
   if (N != mExpectedAdapterCount) {
      String resName;
      try {
         resName = getResources().getResourceName(getId());
      } catch (Resources.NotFoundException e) {
         resName = Integer.toHexString(getId());
      }
      throw new IllegalStateException("The application's PagerAdapter changed the adapter's" +
      " contents without calling PagerAdapter#notifyDataSetChanged!" +
      " Expected adapter item count: " + mExpectedAdapterCount + ", found: " + N +
      " Pager id: " + resName + " Pager class: " + getClass() + " Problematic adapter: " + 
      mAdapter.getClass());
   ...
}

如果只是使用了基本的ViewPager+PagerAdapter的話，導(dǎo)致的原因就是因?yàn)锳dapter沒有刷新。

Solutions##

http://stackoverflow.com/questions/16756131/fragmentstatepageradapter-stopped-working-after-updating-to-adt-22