应用程序的PagerAdapter在不调用notifyDataSetChanged（）

Question

的情况下更改了适配器的内容我正在开发一个android上的简单游戏。我有一个从服务器获取数据并将其加载到ViewPager中的活动。这是活动的代码片段：

url = new ArrayList<>(); 
    name = new ArrayList<>(); 
    viewPager = (ViewPager) findViewById(R.id.viewPager); 
    viewPagerAdapter = new ViewPagerAdapter(getApplicationContext(),url,name); 
    viewPager.setAdapter(viewPagerAdapter); 

    AppController.socket.emit("getDoodle","") 
      .on("doodleList", new Emitter.Listener() { 
       @Override 
       public void call(Object... args) { 
        JSONArray data = (JSONArray)args[0]; 
        Log.e("MYTAG",data.toString()); 
        url.clear(); 
        name.clear(); 
        for(int i=0;i<AppController.playersId.size();i++){ 
         try { 
          if(!data.getJSONObject(i).getString("doodle").equals("null")) { 
           url.add(data.getJSONObject(i).getString("doodle")); 
           name.add(data.getJSONObject(i).getString("id")); 
          } 
         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 
        } 


        runOnUiThread(new Runnable() { 
         @Override 
         public void run() { 
          viewPagerAdapter.notifyDataSetChanged; 
         } 
        }); 
       } 
      }); 

这是我PagerAdapter：

class ViewPagerAdapter extends PagerAdapter { 

Context mContext; 
ArrayList<String> mUri,mId; 

public ViewPagerAdapter(Context context, ArrayList<String> imageUri, ArrayList<String> sid){ 
    mContext = context; 
    mUri = imageUri; 
    this.mId=sid; 
    Log.e("MYTAG",mUri.toString()); 
} 
@Override 
public int getCount() { 
    return mUri.size(); 
} 

@Override 
public int getItemPosition(Object object) { 
    return POSITION_NONE; 
} 

@Override 
public Object instantiateItem(ViewGroup container, final int position) { 
    LayoutInflater mLayoutInflater=(LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    View itemView = mLayoutInflater.inflate(R.layout.pager_child, container, false); 

    final ImageView imageView = (ImageView) itemView.findViewById(R.id.doodleView); 
    TextView nameText = (TextView) itemView.findViewById(R.id.ownerText); 
    String temp = mUri.get(position); 
    if(!temp.equals("")){ 
     Log.e("replace","2"); 
     Glide.with(mContext) 
       .load(temp) 
       .diskCacheStrategy(DiskCacheStrategy.NONE) 
       .into(imageView); 
     nameText.setText(mId.get(position)); 
    } 
    Log.d("pager",mUri.get(position)); 
    itemView.setTag(position); 
    container.addView(itemView); 
    return itemView; 
} 

@Override 
public void destroyItem(ViewGroup container, int position, Object object) { 
    container.removeView((LinearLayout) object); 
} 

@Override 
public boolean isViewFromObject(View view, Object object) { 
    return false; 
}} 

我的错误日志：

FATAL EXCEPTION: main 
                  Process: com.nirup.fuku, PID: 10421 
                  java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 0, found: 1 Pager id: com.nirup.fuku:id/viewPager Pager class: class android.support.v4.view.ViewPager Problematic adapter: class com.nirup.fuku.ViewPagerAdapter 
                   at android.support.v4.view.ViewPager.populate(ViewPager.java:1167) 
                   at android.support.v4.view.ViewPager.populate(ViewPager.java:1116) 
                   at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1642) 
                   at android.view.View.measure(View.java:19857) 
                   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083) 
                   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464) 
                   at android.widget.LinearLayout.measureVertical(LinearLayout.java:758) 
                   at android.widget.LinearLayout.onMeasure(LinearLayout.java:640) 
                   at android.view.View.measure(View.java:19857) 
                   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083) 
                   at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) 
                   at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139) 
                   at android.view.View.measure(View.java:19857) 
                   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083) 
                   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464) 
                   at android.widget.LinearLayout.measureVertical(LinearLayout.java:758) 
                   at android.widget.LinearLayout.onMeasure(LinearLayout.java:640) 
                   at android.view.View.measure(View.java:19857) 
                   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083) 
                   at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) 
                   at android.view.View.measure(View.java:19857) 
                   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083) 
                   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464) 
                   at android.widget.LinearLayout.measureVertical(LinearLayout.java:758) 
                   at android.widget.LinearLayout.onMeasure(LinearLayout.java:640) 
                   at android.view.View.measure(View.java:19857) 
                   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083) 
                   at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) 
                   at com.android.internal.policy.DecorView.onMeasure(DecorView.java:689) 
                   at android.view.View.measure(View.java:19857) 
                   at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2275) 
                   at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1366) 
                   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1619) 
                   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254) 
                   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6337) 
                   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874) 
                   at android.view.Choreographer.doCallbacks(Choreographer.java:686) 
                   at android.view.Choreographer.doFrame(Choreographer.java:621) 
                   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860) 
                   at android.os.Handler.handleCallback(Handler.java:751) 
                   at android.os.Handler.dispatchMessage(Handler.java:95) 
                   at android.os.Looper.loop(Looper.java:154) 
                   at android.app.ActivityThread.main(ActivityThread.java:6119) 
                   at java.lang.reflect.Method.invoke(Native Method) 
                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

我不知道我做错了..任何帮助赞赏。

Answer 1

在添加项目期间无法刷新ViewPager时会出现问题。如果更改的计数与保存的计数不相等，则会出现此错误。

解决这个问题：

你应该叫viewPagerAdapter.notifyDataSetChanged;您更改适配器项目以后。

代码：

public ViewPagerAdapter(Context context, ArrayList<String> imageUri, ArrayList<String> sid){ 
    mContext = context; 
    mUri = imageUri; 
    this.mId=sid; 
    notifyDataSetChanged(); //add here 
    Log.e("MYTAG",mUri.toString()); 
} 

编辑

通话viewPagerAdapter.notifyDataSetChanged(); //你缺少括号