java.util.concurrent.RejectedExecutionException с помощью пула пулов

Question

Я получаю исключение RejectedExecutionException, когда я вызываю executeOnExecutor() в свой адаптер, но это происходит только в этом случае: приложение запускается на устройствах с очень большим экраном, например Nexus 10, а не с меньшими, а также только в том случае, когда экран находится в портретном (а не ландшафтном) режиме в классе, в котором вызывается адаптер.

Это мой адаптер код:

public class HomeListAdapter extends ArrayAdapter<Manga> { 
    Gson gson; 
    private final Context context; 
    private List<Manga> list; 

    public HomeListAdapter(Context context, List<Manga> list) { 
     super(context, R.layout.homelistadapter, list); 

     this.context = context; 
     this.list = list; 
     gson = new Gson(); 
    } 

    static class ViewHolder{ 
     TextView tvTitle; 
     TextView tvChapter; 
     TextView tvDate; 
     ImageView immagine; 
     int position; 
    } 

    @Override 
    public View getView(final int position, View rowView, ViewGroup parent) { 
     final ViewHolder viewHolder; 

     if(rowView==null){ 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      rowView = inflater.inflate(R.layout.homelistadapter, parent, false); 

      viewHolder = new ViewHolder(); 

      viewHolder.tvTitle = (TextView) rowView.findViewById(R.id.tvTitle); 
      viewHolder.tvChapter = (TextView) rowView.findViewById(R.id.tvChapter); 
      viewHolder.tvDate = (TextView) rowView.findViewById(R.id.tvDate); 
      viewHolder.immagine = (ImageView) rowView.findViewById(R.id.imageView); 

      rowView.setTag(viewHolder); 
     } else { 
      viewHolder = (ViewHolder) rowView.getTag(); 
     } 

     viewHolder.position = position; 

     //HERE is where i'm getting the exception only on largest screens 

     new AsyncList(viewHolder, position).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, "url"); 

     return rowView; 
    } 

    private class AsyncList extends AsyncTask<String, Void, MangaSpec> { 
     private ViewHolder holder; 
     private int position; 
     public AsyncList(ViewHolder viewholder, int position){ 
      this.holder = viewholder; 
      this.position = position; 
     } 

     @Override 
     protected MangaSpec doInBackground(String... params) { 
      String urlManga = null; 
      try { 
       urlManga = MainActivity.connessione(params[0]); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
      assert urlManga != null; 
      return gson.fromJson(urlManga.trim(), MangaSpec.class); 
     } 

     @Override 
     protected void onPostExecute(MangaSpec manga) { 
      super.onPostExecute(manga); 

      if(holder.position == position){ 
       holder.tvTitle.setText(list.get(position).getT()); 
       holder.tvTitle.setSelected(true); 

       if(Integer.parseInt(String.valueOf(list.get(position).getS()))==2) 
        holder.immagine.setImageResource(R.drawable.book_close); 

       List generic = manga.getChapters(); 

       List chapters = (List) generic.get(0); 
       double numero = (Double) chapters.get(0); 
       String titoloC = (String) chapters.get(2); 

       if((numero-(int)numero)!=0) 
        holder.tvChapter.setText(numero+" - "+titoloC); 
       else 
        holder.tvChapter.setText((int)numero+" - "+titoloC); 

       holder.tvChapter.setSelected(true); 

       double a = ((Number) chapters.get(1)).doubleValue(); 

       Date date = new Date((long) (a*1000)); 
       String formattedDate = new SimpleDateFormat("HH:mm - dd/MM/yy").format(date); 

       holder.tvDate.setText(formattedDate); 
      } 
     } 
    } 
} 

Это мой LogCat:

java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@331ef9b7 rejected from java.util.concurrent.ThreadPoolExecutor@ed04524[Running, pool size = 9, active threads = 9, queued tasks = 128, completed tasks = 245] 
at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2011) 
at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:793) 
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1339) 
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:590) 
at com.example.giorgio.mangaproject.HomeListAdapter.getView(HomeListAdapter.java:61) 
at android.widget.AbsListView.obtainView(AbsListView.java:2344) 
at android.widget.ListView.measureHeightOfChildren(ListView.java:1270) 
at android.widget.ListView.onMeasure(ListView.java:1182) 
at android.view.View.measure(View.java:17430) 
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727) 
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463) 
at android.view.View.measure(View.java:17430) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
at android.view.View.measure(View.java:17430) 
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:868) 
at android.view.View.measure(View.java:17430) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
at android.view.View.measure(View.java:17430) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453) 
at android.view.View.measure(View.java:17430) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
at android.view.View.measure(View.java:17430) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
at android.view.View.measure(View.java:17430) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560) 
at android.view.View.measure(View.java:17430) 
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001) 
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166) 
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372) 
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054) 
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779) 
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) 
at android.view.Choreographer.doCallbacks(Choreographer.java:580) 
at android.view.Choreographer.doFrame(Choreographer.java:550) 
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5221) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 

Answer 1

Вы начинаете слишком много AsyncTask экземпляров. На этом устройстве с четырехъядерным процессором одновременно запускается не более 9 задач, а рабочая очередь предлагает дополнительные 128 слотов. Вы попытались параллельно создать 138-й элемент.

Исправьте свой код, чтобы использовать меньше одновременных AsyncTask экземпляров. Или, используйте свой собственный Executor с executeOnExecutor().