Impossible d'accéder aux données dans listview à partir de json dans android

-1

Quelqu'un peut-il me dire ce que ce logcat demande?Impossible d'accéder aux données dans listview à partir de json dans android

Suggestions plz.

Merci pour votre temps précieux! ..

StationAdapter

public class StationAdapter extends ArrayAdapter<Stations> { 

Context context; 
List<Stations> originalList; 
List<Stations> temp; 
private StationFilter filter; 

public StationAdapter(Context context, int textViewResourceId, 
     List<Stations> objects) { 
    super(context, textViewResourceId, objects); 
    this.context = context ; 

    this.originalList = new ArrayList<Stations>(); 
    this.originalList.addAll(objects); 

    this.temp = new ArrayList<Stations>(); 
    this.temp.addAll(objects); 
} 

@Override 
public Filter getFilter() { 
    if (filter == null){ 
     filter = new StationFilter(); 
    } 
    return filter; 
} 

private class ViewHolder { 
    TextView name; 
} 

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    // TODO Auto-generated method stub 
    ViewHolder holder = null; 

    if (convertView == null) { 

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




     holder = new ViewHolder(); 
     holder.name = (TextView) convertView.findViewById(R.id.textView_single_item); 

     convertView.setTag(holder); 
    } 
    else 
    { 
     holder = (ViewHolder) convertView.getTag(); 
    } 
    Stations stations =originalList.get(position); 
    holder.name.setText(stations.station_name); 

    convertView.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      tab_detailsActivity.weatherData=null; 
      System.out.println("adap "+ originalList.get(position).station_name+" "+originalList.get(position).station_code); 
      Stations station=originalList.get(position); 
      if(station.isCamera){ 
       Intent intent =new Intent(context,TabhostActivity.class); 
       intent.putExtra("station_code", station.station_code); 
       intent.putExtra("station_name", station.station_name); 
       intent.putExtra("isCamera", "YES"); 
       context.startActivity(intent); 
      }else{ 
       Intent txt_det_intent = new Intent(context, tab_detailsActivity.class); 
       txt_det_intent.putExtra("station_code", station.station_code); 
       txt_det_intent.putExtra("station_name", station.station_name); 
       txt_det_intent.putExtra("isCamera", "NO"); 
       context.startActivity(txt_det_intent); 
      } 
     } 
    }); 
    return convertView; 
} 

private class StationFilter extends Filter 
{ 

    @Override 
    protected FilterResults performFiltering(CharSequence constraint) { 

     constraint = constraint.toString().toLowerCase(); 
     FilterResults result = new FilterResults(); 
     if(constraint != null && constraint.toString().length() > 0) 
     { 
      ArrayList<Stations> filteredItems = new ArrayList<Stations>(); 

      for(int i = 0, l = temp.size(); i < l; i++) 
      { 
       Stations stations= temp.get(i); 
       if(stations.station_name.toString().toLowerCase().startsWith(constraint.toString())) 
        filteredItems.add(stations); 
      } 
      result.count = filteredItems.size(); 
      result.values = filteredItems; 
     } 
     else 
     { 
      synchronized(this) 
      { 
       result.values = temp; 
       result.count = temp.size(); 
      } 
     } 
     return result; 
    } 

    @SuppressWarnings("unchecked") 
    @Override 
    protected void publishResults(CharSequence constraint, 
      FilterResults results) { 

     originalList = (ArrayList<Stations>)results.values; 
     notifyDataSetChanged(); 
     clear(); 
     for(int i = 0, l = originalList.size(); i < l; i++) 
      add(originalList.get(i)); 
     notifyDataSetInvalidated(); 
    } 
}} 





**Logcat** 
06-07 16:44:46.850: E/AndroidRuntime(21145): FATAL EXCEPTION: main 
06-07 16:44:46.850: E/AndroidRuntime(21145): java.lang.NullPointerException 
06-07 16:44:46.850: E/AndroidRuntime(21145): at org.twinkle.weather.StationAdapter.getView(StationAdapter.java:70) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.AbsListView.obtainView(AbsListView.java:2472) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.ListView.makeAndAddView(ListView.java:1775) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.ListView.fillDown(ListView.java:678) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.ListView.fillFromTop(ListView.java:739) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.ListView.layoutChildren(ListView.java:1628) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.AbsListView.onLayout(AbsListView.java:2307) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.View.layout(View.java:14072) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewGroup.layout(ViewGroup.java:4657) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1655) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1513) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.onLayout(LinearLayout.java:1426) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.View.layout(View.java:14072) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewGroup.layout(ViewGroup.java:4657) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1655) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1513) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.onLayout(LinearLayout.java:1426) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.View.layout(View.java:14072) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewGroup.layout(ViewGroup.java:4657) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.View.layout(View.java:14072) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewGroup.layout(ViewGroup.java:4657) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1655) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1513) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.LinearLayout.onLayout(LinearLayout.java:1426) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.View.layout(View.java:14072) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewGroup.layout(ViewGroup.java:4657) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.View.layout(View.java:14072) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewGroup.layout(ViewGroup.java:4657) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2004) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1825) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1120) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4604) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.Choreographer.doCallbacks(Choreographer.java:555) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.Choreographer.doFrame(Choreographer.java:525) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.os.Handler.handleCallback(Handler.java:615) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.os.Handler.dispatchMessage(Handler.java:92) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.os.Looper.loop(Looper.java:137) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at android.app.ActivityThread.main(ActivityThread.java:4921) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at java.lang.reflect.Method.invokeNative(Native Method) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at java.lang.reflect.Method.invoke(Method.java:511) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 
06-07 16:44:46.850: E/AndroidRuntime(21145): at dalvik.system.NativeStart.main(Native Method)

Source

2013-06-07 Nakshatran

qui est votre numéro de ligne 70 dans StationAdapter.java. Il a assigné la valeur "null" de sorte que "Null Pointer Exception" est tiré dans l'adaptateur. –

@ChintanRathod ligne 70: holder.name.setText (stations.station_name); – Nakshatran

@ChintanRathod plz visiter ma question à nouveau j'ai inclus mon adaptateur pour référence – Nakshatran

j'ai deux doutes

1) stations.station_name dans holder.name.setText(stations.station_name); n'a pas de valeur. S'il vous plaît vérifier si "nom_de_station" est initialisé ou non?
2) holder.name peut être null. Vérifiez quand vous affectez convertView.findViewById(R.id.textView_single_item);, textview_single_item est là dans votre mise en page.

Source

2013-06-07 11:32:41

Si je cours mon application sur mobile version 2.2 avec le code ci-dessus, son fonctionnement, mais il ne fonctionne pas sur les versions nid d'abeilles et +, mon application s'est écrasé et montré quelques erreurs sur logcat ce que je vous ai donné sur ma question – Nakshatran

Vous obtenez un java.lang.NullPointerException

Modifier cette ligne

convertView = inflater.inflate(R.layout.station_child, null);

Pour ce

convertView = inflater.inflate(R.layout.station_child, parent, false);

Source

2013-06-07 11:34:25 Thalaivar

je reçois une erreur sur cette ligne 67 \t \t holder.name.setText (stations.station_name); si je suis votre suggestion – Nakshatran

changez cette ligne ci-dessous et voyez si vous obtenez la même erreur holder.name.setText ("No Error Now"); Si cela fonctionne, alors il est clair que stations.station_name n'a aucune valeur. – Thalaivar

voir si je cours mon application sur 2.2 mobile versionné avec le code ci-dessus, son fonctionnement bien, mais il ne fonctionne pas sur nid d'abeille et + versions – Nakshatran

Impossible d'accéder aux données dans listview à partir de json dans android

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