viewPager使用时加载数据时显示IllegalStateException异常，解决不了。。。。

从newsPager中得到newsDetailTitles标题的详细内容，这是通过构造器传过来的。打印日志78行能打印，45行打印出来共size是12.但是程序出现了异常
java.lang.IllegalStateException: 
The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged。

从网上查询的结果是adapter中的数据改变了，却没有重新加载数据，需要在数据改变之后adapter.notifyDataSetChanged。但是找不到数据改变的地方。
今天太累了，这个bug找到答案时再写。

 1 package com.atguigu.beijingnews2.pager.newsdetailpager;

 import android.app.Activity;
 import android.content.Context;
 import android.support.v4.view.PagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;

 import com.atguigu.beijingnews2.R;
 import com.atguigu.beijingnews2.utils.LogUtils;

 import org.xutils.view.annotation.ViewInject;
 import org.xutils.x;

 import java.util.ArrayList;

 /**
  * Created by Administrator on 2016/2/18.
  */
 public class NewsDetailPager {
     private Activity activity;
     @ViewInject(R.id.vp_news_detail_paper)
     private ViewPager vp_news_detail_paper;
     private ArrayList<String> newsDetailTitles=new ArrayList<>() ;
     private PagerAdapter adapter = new PagerAdapter() {
         @Override
         public Object instantiateItem(ViewGroup container, int position) {
             LogUtils.e("TAG");
 //            String title = newsDetailTitles.get(position);
 //            textView.setText(title);
             container.addView(views.get(position));
             return views.get(position);
         }

         @Override
         public void destroyItem(ViewGroup container, int position, Object object) {
             LogUtils.e("TAG");
             container.removeView((View) object);
         }

         @Override
         public int getCount() {
             LogUtils.e("TAG" + newsDetailTitles.size());

             return newsDetailTitles.size();
         }

         @Override
         public boolean isViewFromObject(View view, Object object) {
             LogUtils.e("TAG");
             return view == object;
         }
     };
     private TextView textView;
     ArrayList<View> views = new ArrayList<>();
     public NewsDetailPager(Context context, ArrayList<String> newsDetailTitles ) {
         activity = (Activity) context;
         this.newsDetailTitles=newsDetailTitles;
 //        initView();

     }

     public View initView() {
         View view = View.inflate(activity, R.layout.news_detail_paper, null);
         x.view().inject(this, view);
         for (int i = 0; i < newsDetailTitles.size(); i++) {
             TextView textView = new TextView(activity);
             textView.setText(newsDetailTitles.get(i));
             views.add(textView);
             LogUtils.e("TAG");
         }
 //        textView = new TextView(activity);
         LogUtils.e("TAG");
         vp_news_detail_paper.setAdapter(adapter);
         return view;
     }
 }

E/AndroidRuntime: FATAL EXCEPTION: main
                                                                        Process: com.atguigu.beijingnews2, PID: 1622
                                                                        java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 0, found: 4 Pager id: com.atguigu.beijingnews2:id/vp_news_pager Pager class: class com.atguigu.beijingnews2.view.NoScrollViewPager Problematic adapter: class com.atguigu.beijingnews2.pager.NewsPager$2
                                                                            at android.support.v4.view.ViewPager.populate(ViewPager.java:999)
                                                                            at android.support.v4.view.ViewPager.populate(ViewPager.java:951)
                                                                            at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1473)
                                                                            at android.view.View.measure(View.java:16497)
                                                                            at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
                                                                            at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
                                                                            at android.view.View.measure(View.java:16497)
                                                                            at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1488)
                                                                            at android.view.View.measure(View.java:16497)
                                                                            at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
                                                                            at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
                                                                            at android.view.View.measure(View.java:16497)
                                                                            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
                                                                            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
                                                                            at android.view.View.measure(View.java:16497)
                                                                            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
                                                                            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
                                                                            at android.view.View.measure(View.java:16497)