空指针列表适配器android

Question

我创建了我自己的适配器，将一些音乐会放在列表中。一切工作正常，没有日间分隔符，但与他们，当你向下滚动列表和convertView函数被调用的每一个新行将出现在屏幕上我得到一个NullPointer异常下面一行convertView函数：

tvNombre.setText(entry.getArtista()); 

但是我可以在日志中打印艺术家的名字，并且我修改了将正确的列表传递给适配器。有谁能够帮助我？

在此先感谢。

listConciertoEvento.add(new ConciertoEvento("dia_0", "", new GregorianCalendar(2012,10,dia,0,0))); 

    listConciertoEvento.add(new ConciertoEvento(x++,"Moodyman","Becool","Electrónica", 
      new GregorianCalendar(2012,10,dia,23,30),new GregorianCalendar(2012,10,dia+1,5,0),"","",10)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Chinese Man","Razzmataz 2","Trip-Hop", 
      new GregorianCalendar(2012,10,dia,21,0),new GregorianCalendar(2012,10,dia,23,0),"","", 50)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Kreator","Razzmataz","Thrash Metal", 
      new GregorianCalendar(2012,10,dia,20,30),new GregorianCalendar(2012,10,dia,23,0),"","",10)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Barricada","KGB","Rock", 
      new GregorianCalendar(2012,10,dia,22,0),new GregorianCalendar(2012,10,dia+1,0,30),"","", 50)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"The Buzzcocks","Apolo","Thrash Metal", 
      new GregorianCalendar(2012,10,dia,21,30),new GregorianCalendar(2012,10,dia,23,30),"","",10)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Mr.Oizo","La 2","Electrónica", 
      new GregorianCalendar(2012,10,dia,23,30),new GregorianCalendar(2012,10,dia+1,3,0),"","", 50)); 



    dia++; 
    //listConciertoEvento.add(new ConciertoEvento("dia_1", "", new GregorianCalendar(2012,10,dia,0,0))); 

     listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_1","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_2","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_3","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_4","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_5","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_6","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_7","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_8","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_9","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_10","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_11","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_12","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_13","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_14","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 
    listConciertoEvento.add(new ConciertoEvento(x++,"Cannibal Corpse_15","Razzmataz","Death Metal",new GregorianCalendar(2012,10,13,13,30),new GregorianCalendar(2012,10,13,15,0),"","", 15)); 

这里convertView的适配器上的代码：

public View getView(int position, View convertView, ViewGroup viewGroup) { 

    ConciertoEvento entry = listConciertoEvento.get(position); 
    if (convertView == null) { 

     if (!entry.getArtista().startsWith("dia_")){ 

      Log.v("lalalala", "XXXX layout concierto"); 

      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.concierto_evento_row, null); 

     }else{ 

      Log.v("lalalala", "XXXX layout dia"); 

      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.dia_row, null); 
     } 
    } 

final int id = entry.getId(); 
    if (!entry.getArtista().startsWith("dia_")){ 

     Log.v("lalalala", "XXXX is concert"); 

     ImageView imSquare = (ImageView) convertView.findViewById(R.id.imSquare); 

     TextView tvNombre = (TextView) convertView.findViewById(R.id.tvNombre); 

     Log.v("lalalala", entry.getArtista()); 
     tvNombre.setText(entry.getArtista()); 
     Log.v("lalalala", "XXXX tvNombre.setText(entry.getArtista()); done"); 


     TextView tvPath = (TextView) convertView.findViewById(R.id.tvPath); 
     tvPath.setText(entry.getPath_imagen()); 



    }else{ 
     Log.v("lalalala", "XXXX is day"); 
     Log.v("lalalala", entry.getArtista()); 

    } 

    return convertView; 
} 

这里日志：

10-22 12:23:11.468: V/lalalala(582): XXXXXXXXXXX xivato en fragment2 
10-22 12:23:11.468: V/lalalala(582): dia_0 
10-22 12:23:11.468: V/lalalala(582): Kreator 
10-22 12:23:11.468: V/lalalala(582): Chinese Man 
10-22 12:23:11.468: V/lalalala(582): The Buzzcocks 
10-22 12:23:11.468: V/lalalala(582): Barricada 
10-22 12:23:11.468: V/lalalala(582): Mr.Oizo 
10-22 12:23:11.468: V/lalalala(582): Moodyman 
10-22 12:23:11.468: V/lalalala(582): dia_1 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_15 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_14 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_13 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_12 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_11 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_10 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_9 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_8 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_7 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_6 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_5 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_4 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_3 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_2 
10-22 12:23:11.468: V/lalalala(582): Cannibal Corpse_1 
10-22 12:23:11.619: D/dalvikvm(582): GC_EXTERNAL_ALLOC freed 130K, 51% free 2642K/5379K, external 904K/1038K, paused 48ms 
10-22 12:23:11.669: V/lalalala(582): XXXX layout dia 
10-22 12:23:11.669: V/lalalala(582): XXXX is day 
10-22 12:23:11.669: V/lalalala(582): dia_0 
10-22 12:23:11.679: V/lalalala(582): XXXX layout concierto 
10-22 12:23:11.739: D/dalvikvm(582): GC_EXTERNAL_ALLOC freed 12K, 51% free 2640K/5379K, external 1058K/1570K, paused 50ms 
10-22 12:23:11.779: V/lalalala(582): XXXX is concert 
10-22 12:23:11.779: V/lalalala(582): Kreator 
10-22 12:23:11.779: V/lalalala(582): XXXX tvNombre.setText(entry.getArtista()); done 
10-22 12:23:11.789: V/lalalala(582): XXXX layout concierto 
10-22 12:23:11.799: V/lalalala(582): XXXX is concert 
10-22 12:23:11.799: V/lalalala(582): Chinese Man 
10-22 12:23:11.799: V/lalalala(582): XXXX tvNombre.setText(entry.getArtista()); done 
10-22 12:23:11.809: V/lalalala(582): XXXX layout concierto 
10-22 12:23:11.819: V/lalalala(582): XXXX is concert 
10-22 12:23:11.819: V/lalalala(582): The Buzzcocks 
10-22 12:23:11.819: V/lalalala(582): XXXX tvNombre.setText(entry.getArtista()); done 
10-22 12:23:11.819: V/lalalala(582): XXXX layout concierto 
10-22 12:23:11.839: V/lalalala(582): XXXX is concert 
10-22 12:23:11.839: V/lalalala(582): Barricada 
10-22 12:23:11.839: V/lalalala(582): XXXX tvNombre.setText(entry.getArtista()); done 
10-22 12:23:11.839: V/lalalala(582): XXXX layout concierto 
10-22 12:23:11.869: V/lalalala(582): XXXX is concert 
10-22 12:23:11.879: V/lalalala(582): Mr.Oizo 
10-22 12:23:11.879: V/lalalala(582): XXXX tvNombre.setText(entry.getArtista()); done 
10-22 12:23:11.889: V/lalalala(582): XXXX layout concierto 
10-22 12:23:11.899: V/lalalala(582): XXXX is concert 
10-22 12:23:11.899: V/lalalala(582): Moodyman 
10-22 12:23:11.899: V/lalalala(582): XXXX tvNombre.setText(entry.getArtista()); done 
10-22 12:23:11.909: V/lalalala(582): XXXX layout dia 
10-22 12:23:11.909: V/lalalala(582): XXXX is day 
10-22 12:23:11.909: V/lalalala(582): dia_1 
10-22 12:23:11.909: V/lalalala(582): XXXX layout concierto 
10-22 12:23:11.929: V/lalalala(582): XXXX is concert 
10-22 12:23:11.929: V/lalalala(582): Cannibal Corpse_15 
10-22 12:23:11.929: V/lalalala(582): XXXX tvNombre.setText(entry.getArtista()); done 
10-22 12:23:37.829: W/KeyCharacterMap(582): No keyboard for id 0 
10-22 12:23:37.829: W/KeyCharacterMap(582): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 
10-22 12:23:39.729: V/lalalala(582): XXXX is concert 
10-22 12:23:39.739: V/lalalala(582): Cannibal Corpse_14 
10-22 12:23:39.739: D/AndroidRuntime(582): Shutting down VM 
10-22 12:23:39.749: W/dalvikvm(582): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
10-22 12:23:39.769: E/AndroidRuntime(582): FATAL EXCEPTION: main 
10-22 12:23:39.769: E/AndroidRuntime(582): java.lang.NullPointerException 
10-22 12:23:39.769: E/AndroidRuntime(582): at com.u.totsound.AdapterConciertoEvento.getView(AdapterConciertoEvento.java:89) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.AbsListView.obtainView(AbsListView.java:1409) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.ListView.addViewBelow(ListView.java:2914) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.ListView.scrollListItemsBy(ListView.java:2843) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.ListView.arrowScrollImpl(ListView.java:2340) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.ListView.arrowScroll(ListView.java:2287) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.ListView.commonKey(ListView.java:2089) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.ListView.onKeyDown(ListView.java:2036) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.KeyEvent.dispatch(KeyEvent.java:1256) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.View.dispatchKeyEvent(View.java:3855) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:787) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.ListView.dispatchKeyEvent(ListView.java:2021) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.widget.TabHost.dispatchKeyEvent(TabHost.java:278) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:789) 
10-22 12:23:39.769: E/AndroidRuntime(582): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1687) 
10-22 12:23:39.769: E/AndroidRuntime(582): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1120) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.app.Activity.dispatchKeyEvent(Activity.java:2073) 
10-22 12:23:39.769: E/AndroidRuntime(582): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1663) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2560) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2535) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.view.ViewRoot.handleMessage(ViewRoot.java:1867) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.os.Looper.loop(Looper.java:123) 
10-22 12:23:39.769: E/AndroidRuntime(582): at android.app.ActivityThread.main(ActivityThread.java:3683) 
10-22 12:23:39.769: E/AndroidRuntime(582): at java.lang.reflect.Method.invokeNative(Native Method) 
10-22 12:23:39.769: E/AndroidRuntime(582): at java.lang.reflect.Method.invoke(Method.java:507) 
10-22 12:23:39.769: E/AndroidRuntime(582): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
10-22 12:23:39.769: E/AndroidRuntime(582): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
10-22 12:23:39.769: E/AndroidRuntime(582): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

你知道ListAdapter有它的方式来管理各种不同行的？

您应该依赖public int getItemViewType (int position)和public int getViewTypeCount()而不是检查entry.getArtist()是否以"dia"开头。这个问题肯定与此有关。