Listview mit mehrreihigem Layout

Question

Hi unten ist meine Klasse für Baseadapter, aber es funktioniert nicht !!

ich versuche Listview mit mehreren Reihen zu verwenden, verstehe ich nicht, wo ich falsch war erste Layout enthält nur Textview und der zweite enthält Textview und Imageview

public class CustomAdapter extends BaseAdapter { 

public static final int TYPE_ODD = 0; 
public static final int TYPE_EVEN = 1; 




private Context context; 
private List<ItemSlideMenu> lstItem; 
@Override 
public int getViewTypeCount() { 
    return 2; 
} 

@Override 
public int getItemViewType(int position) { 
    return lstItem.get(position).getType(); 
} 


public CustomAdapter(Context context, List<ItemSlideMenu> lstItem) { 
    this.context = context; 
    this.lstItem = lstItem; 
} 

@Override 
public int getCount() { 
    return lstItem.size(); 
} 

@Override 
public Object getItem(int position) { 
    return lstItem.get(position); 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    int listViewItemType = getItemViewType(position); 

    if (convertView == null) { 

     if (listViewItemType == TYPE_EVEN) { 
      convertView = View.inflate(context, R.layout.item_sliding_menu, null); 
      ImageView img = (ImageView) convertView.findViewById(R.id.item_img); 
      TextView tv = (TextView) convertView.findViewById(R.id.item_title); 

      ItemSlideMenu item = lstItem.get(position); 
      img.setImageResource(item.getImgId()); 
      tv.setText(item.getTitle()); 

     } 

     else if (listViewItemType == TYPE_ODD) { 
      convertView = View.inflate(context, R.layout.reseaux, null); 
      ImageView img = (ImageView) convertView.findViewById(R.id.item_img); 
      TextView tv = (TextView) convertView.findViewById(R.id.item_title); 

      ItemSlideMenu item = lstItem.get(position); 
      img.setImageResource(item.getImgId()); 
      tv.setText(item.getTitle()); 

     } 


    } 

return convertView ; 

}} 

ich habe einen Fehler

05-27 16:05:45.297 25537-25537/com.example.getgpslocation E/AndroidRuntime: FATAL EXCEPTION: main 
Process: com.example.getgpslocation, PID: 25537 
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference 

Fragment3.java

listSliding3 = new ArrayList<>(); 
    //Add item for sliding list 
    listSliding3.add(new ItemSlideMenu("TRAM " , CustomAdapter.TYPE_ODD)); 
    listSliding3.add(new ItemSlideMenu(R.drawable.ic_action_about,"Ligne1",CustomAdapter.TYPE_EVEN)); 
    listSliding3.add(new ItemSlideMenu(R.drawable.ic_action_about,"Ligne2",CustomAdapter.TYPE_EVEN)); 
    listSliding3.add(new ItemSlideMenu("BUS " , CustomAdapter.TYPE_ODD)); 


    CustomAdapter customAdapter = new CustomAdapter(getActivity(),listSliding3); 
    listViewSliding3.setAdapter(customAdapter); 

Answer 1

W Henne und fügte hinzu:

listSliding3.add(new ItemSlideMenu("TRAM " , CustomAdapter.TYPE_ODD)); 

der "THAM " Wert ist keine Ressource-ID, so dass Sie ein NullPointerException auf img.setImageResource(item.getImgId());

Nutzung erhalten:

listSliding3.add(new ItemSlideMenu("", "TRAM ", CustomAdapter. TYPE_ODD)); 

Und Adapter nicht festlegen Bild: