FragmentPagerAdapter notifyDataSetChanged 不起作用的彻底解决方式

往上一堆乱七八糟的，比如修改initiateItem，增加flag等，但是其实最好最简单的也是

把FragmentPagerAdapter换成 

FragmentStatePagerAdapter

这样就解决了不更新的问题

public class MyFragmentAdapter extends FragmentStatePagerAdapter {private int length ;private ArrayList<Fragment> mFragments;//碎片数组  private int mCount;FragmentManager fm ;public MyFragmentAdapter(FragmentManager fm , ArrayList<Fragment> mFragments) {super(fm);this.fm = fm;this.length = mFragments.size();this.mFragments = mFragments;FragmentTransaction mTransaction = fm.beginTransaction();}@Override
   public int getItemPosition(Object object) {return POSITION_NONE; //这个是必须的  }@Override
   public Fragment getItem(int position) {int size = mFragments.size();if(position >= size)return mFragments.get(size - 1);return mFragments.get(position);}@Override
   public int getCount() {if(mCount > 0) {return mCount;} else {return length;}}public void setFragments(ArrayList<Fragment> fragments) {if(this.mFragments != null){FragmentTransaction ft = fm.beginTransaction();for(Fragment f:this.mFragments){ft.remove(f);}ft.commit();ft=null;fm.executePendingTransactions();}this.mFragments = fragments;notifyDataSetChanged();}public void setMaxCount(int count) {if(mCount < length) {if(mCount != count) {mCount = count;notifyDataSetChanged();}}}public void setmFragments(ArrayList<Fragment> mFragments) {this.mFragments = mFragments;}
}

详细请参考

http://stackoverflow.com/questions/10849552/update-viewpager-dynamically