带空列表的列表失败，无法加载消息

Question

该代码使用baseadapter使用项填充listview。为了显示emptylist消息，我正在使用setEmptyView来处理emptylist。但是它会因IndexOutOfBoundsException而失败。我做错了什么？

在活动

ArrayList<String> fNameTemp = (ArrayList<String>) intent.getSerializableExtra("fName_Array"); 
ArrayList<String> lNameTemp = (ArrayList<String>) intent.getSerializableExtra("lName_Array"); 

MyListAdapter myListAdapter = new MyListAdapter SecondActivity.this,fNameTemp ,lNameTemp); 
namesList = (ListView) findViewById(R.id.list_names); 

namesList.setEmptyView(findViewById(R.id.emptyElement)); 
namesList.setAdapter(myListAdapter); 

在XML

<ListView 
      android:id="@+id/list_names" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" >  
</ListView> 
<TextView 
     android:id="@+id/emptyElement" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerInParent="true" 
     android:text="EMPTY!" 
     android:visibility="gone" /> 

适配器

private LayoutInflater mInflater; 
    private ArrayList<String> fName = new ArrayList<String>(); 
    private ArrayList<String> lName = new ArrayList<String>(); 

    public MyListAdapter (Context c, ArrayList<String> LS_fName , ArrayList<String> LS_lName { 
     mInflater = LayoutInflater.from(c); 

     this.fName = LS_fName; 
     this.lName = LS_lName; 
    } 
public int getCount() { 
     return fName.size(); 
    } 

    public Object getItem(int position) { 
     return fName.get(position); 
    } 

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

static class ViewHolder { 
     TextView value_fName; 
     TextView value_lName; 
      } 

    public View getView(final int position, View convertView, ViewGroup parent) { 
final ViewHolder holder; 
     if (convertView == null) 
     { 
      convertView = mInflater.inflate(R.layout.item_names, null); 
      holder = new ViewHolder(); 

      holder.value_fName = (TextView) convertView.findViewById(R.id.value_fName); 
      holder.value_lName = (TextView) convertView.findViewById(R.id.value_lName); 

convertView.setTag(holder); 
     } else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 

     holder.value_fName.setText(fName.get(position)); 
     holder.value_lName.setText(lName.get(position)); 
    return convertView; 
    } 

Answer 1

您必须使用充气view只引用将无法工作。

namesList.setEmptyView(findViewById(R.id.emptyElement)); 

---

例

 // Create a progress bar to display while the list loads 
     ProgressBar progressBar = new ProgressBar(this); 
     progressBar.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, 
       LayoutParams.WRAP_CONTENT, Gravity.CENTER)); 
     progressBar.setIndeterminate(true); 
     namesList.setEmptyView(progressBar);