notifyDataSetChanged不適用於自定義適配器和不同類型的行

Question

我正在開發一個應用程序，其中主要任務是顯示不同類型的項目列表（完全是4種不同類型的項目）。爲此，我已經實現了一個自定義適配器象下面這樣：當它加載的項目首次

public class NjoftimeAdapter extends BaseAdapter { 


    final List<NjoftimeItemInterface> rows; 
    final ArrayList<Njoftime> njoftime; 


    NjoftimeAdapter(ArrayList<Njoftime> njoftime, Context context) { 

     this.njoftime = njoftime; 
     rows = new ArrayList<NjoftimeItemInterface>();// member variable 
     // iteron mbi objektet e bizneset dhe kontrollon cfare tipi eshte. Ne 
     // varesi te tipit theret adapterin e tij 
     for (Njoftime njoftim : njoftime) { 

      if (njoftim.getType() == NjoftimeKategori.PUNA_IME.ordinal()) { 
       rows.add(new PunaImeAdapter(LayoutInflater.from(context), 
         njoftim, context)); 
      } 
      if (njoftim.getType() == NjoftimeKategori.NJOFTIME_CATEGORY.ordinal()) { 
       rows.add(new OthersAdapter(LayoutInflater.from(context), 
         njoftim, context)); 
      } 

      if (njoftim.getType() == NjoftimeKategori.MAKINA_CATEGORY.ordinal()) { 
       rows.add(new MakinaAdapter(LayoutInflater.from(context), 
         njoftim, context)); 
      } 

      if (njoftim.getType() == NjoftimeKategori.PRONA_CATEGORY.ordinal()) { 
       rows.add(new PronaAdapter(LayoutInflater.from(context), 
         njoftim, context)); 
      } 

     } 
    } 

    @Override 
    public int getViewTypeCount() { 
     return NjoftimeKategori.values().length; 
    } 

    @Override 
    public int getItemViewType(int position) { 
     return rows.get(position).getViewType(); 
    } 

    public int getCount() { 
     return rows.size(); 
    } 

    public void updateNjoftimeList(ArrayList<Njoftime> newList){ 

     njoftime.clear(); 
     njoftime.addAll(newList); 
     this.notifyDataSetChanged(); 
    } 

    public Object getItem(int position) { 
     return position; 
    } 

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

    public View getView(int position, View convertView, ViewGroup parent) { 
     return rows.get(position).getView(convertView); 
    } 
} 

，似乎一切都很好，但是當我要加載更多的數據，並更新listView沒有什麼變化，它只顯示第一次加載的數據。

爲了更新列表中我用下面的代碼：

mAdapter.updateNjoftimeList(njoftime); 

這就要求在適配器內部的方法。例如，對於每種不同類型的項目，我都開發了一段代碼來顯示下面的數據;例如，

OtherAdapter: 

public class OthersAdapter implements NjoftimeItemInterface { 

    private Njoftime njoftime; 
    private LayoutInflater inflater; 
    private Context mContext; 

    public OthersAdapter(LayoutInflater inflater, Njoftime njoftime, Context context) { 
     this.njoftime = njoftime; 
     this.inflater = inflater; 
     this.mContext = context; 
    } 

    public View getView(View convertView) { 
     ViewHolder holder; 
     View view; 
     //we have a don't have a converView so we'll have to create a new one 
     if (convertView == null) { 
      ViewGroup viewGroup = (ViewGroup) inflater.inflate(R.layout.other_element, null); 

      //use the view holder pattern to save of already looked up subviews 
      holder = new ViewHolder(
        (TextView) viewGroup.findViewById(R.id.tittle), 
        (TextView) viewGroup.findViewById(R.id.short_desc), 
        (TextView) viewGroup.findViewById(R.id.category), 
        (RelativeLayout)viewGroup.findViewById(R.id.card)); 
      viewGroup.setTag(holder); 

      view = viewGroup; 
     } else { 
      //get the holder back out 
      holder = (ViewHolder) convertView.getTag(); 

      view = convertView; 
     } 

     //change the font 
     Typeface typeFace = Typeface.createFromAsset(mContext.getAssets(), "fonts/Lato-Regular.ttf"); 

     holder.category.setTypeface(typeFace); 
     holder.short_description.setTypeface(typeFace); 
     holder.title.setTypeface(typeFace); 

     Others other = (Others) njoftime; 

     holder.title.setText(other.getTitle()); 
     holder.short_description.setText(other.getShort_desc()); 
     holder.category.setText(other.getCategory()); 

     if(other.getSponsor()){ 
      holder.card.setBackgroundResource(R.drawable.njoftime_item_background_sponsor); 
     } 

     return view; 
    } 


    public int getViewType() { 
     return NjoftimeKategori.NJOFTIME_CATEGORY.ordinal(); 
    } 

    public class ViewHolder { 

     public TextView title; 
     public TextView short_description; 
     public TextView category; 
     public RelativeLayout card; 


     public ViewHolder(TextView title, TextView short_description, TextView category,RelativeLayout card) { 

      this.title = title; 
      this.short_description = short_description; 
      this.category = category; 
      this.card = card; 

     } 
    } 
} 

我也試試：mAdapter.notifyDataSetChanged()但它沒有奏效。

我知道這個問題看起來很像以前問過的很多問題，但我還沒有找到解決方案。其中一個原因可能是我必須展示的不同類型的物品。

任何解決方案將不勝感激。

Answer 1

好吧，不知何故我找到了解決方案。訣竅是我已經建立了基於row的適配器，其類型爲NjoftimeItemInterface。當我撥打this.notifyDataSetChanged();時，由於適配器的行數相同，因此我沒有更新該行的ArrayList，因此沒有任何反應。正確的實現如下：

public void updateNjoftimeList(ArrayList<Njoftime> newList){ 


    for (Njoftime njoftim : newList) { 

     if (njoftim.getType() == NjoftimeKategori.PUNA_IME.ordinal()) { 
      rows.add(new PunaImeAdapter(LayoutInflater.from(mContext), 
        njoftim, mContext)); 
     } 
     if (njoftim.getType() == NjoftimeKategori.NJOFTIME_CATEGORY.ordinal()) { 
      rows.add(new OthersAdapter(LayoutInflater.from(mContext), 
        njoftim, mContext)); 
     } 

     if (njoftim.getType() == NjoftimeKategori.MAKINA_CATEGORY.ordinal()) { 
      rows.add(new MakinaAdapter(LayoutInflater.from(mContext), 
        njoftim, mContext)); 
     } 

     if (njoftim.getType() == NjoftimeKategori.PRONA_CATEGORY.ordinal()) { 
      rows.add(new PronaAdapter(LayoutInflater.from(mContext), 
        njoftim, mContext)); 
     } 
    } 

    this.notifyDataSetChanged(); 

}