如何在ArrayList中處理來自ArrayList的空值Android

Question

我有一個ArrayList和一個BaseAdapter來擴充我的佈局，當arraylist中的一個數組爲空時，佈局上的值顯示文本「NaN％」它非常煩人，我想要用setText作爲（0％）從我的數組列表中處理一個空數組。所以如何在baseadapter android中處理ArrayList中的空值？這是我的代碼：

public class TabelNABDetail extends BaseAdapter { 
    Context context; 
    ArrayList<NabDetail> listData;//stack 
    int count; 

    public TabelNABDetail(Context context, ArrayList<NabDetail>listData){ 
     this.context=context; 
     this.listData=listData; 
     this.count=listData.size(); 
    } 
    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
//  return count; 
     return (listData==null) ? 0 : listData.size(); 
    } 

    @Override 
    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

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


     if(view==null){ 
      LayoutInflater inflater=(LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE); 
      view= inflater.inflate(R.layout.layout_tabel_detailnab, null); 
      holder=new ViewHolder(); 
      holder.persen_hke1=(TextView)view.findViewById(R.id.varpersenke1); 
      view.setTag(holder); 
     } 
     else{ 
      holder=(ViewHolder)view.getTag(); 

     } 

     if (position==0) { 
      holder.persen_hke1.setText("0%"); 


    } else { 
     holder.persen_hke1.setText(String.format("%.5f",listData.get(position).getpersen_hke1())+"%"); 

    } 
     return view; 
    } 

    static class ViewHolder{ 
     TextView ,persen_hke1; 

    } 

我想處理，如果listData.get（位置）.getpersen_hke1（）爲空值，它會是holder.persen_hke1.setText("0%")如何解決呢？由於之前

Answer 1

這樣

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

    if(view==null){ 
     LayoutInflater inflater=(LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE); 
     view= inflater.inflate(R.layout.layout_tabel_detailnab, null); 
     holder=new ViewHolder(); 
     holder.persen_hke1=(TextView)view.findViewById(R.id.varpersenke1); 
     view.setTag(holder); 
    } else { 
     holder=(ViewHolder)view.getTag(); 
    } 

    if (position==0) { 
     holder.persen_hke1.setText("0%"); 
    } else { 
     **/////// these lines are extra lines add into your code** 

     NabDetail nabDetail = listData.get(position) 
     if(!nabDetail.getpersen_hke1().equals("")) 
      holder.persen_hke1.setText(String.format("%.5f",listData.get(position).getpersen_hke1())+"%"); 
     } else { 
      holder.persen_hke1.setText("0%"); 
     } 
    } 
    return view; 
}