重用TableRow

Question

为了节省填充TableLayout (使用重复数据)时的时间，我想重用TableRows。然而，当我尝试重用它们时，我会得到以下错误：

java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

我正在将TableRows存储在ArrayList中。然后，我将ArrayList存储在哈希表中。我就是这样填充ArrayList和Hashtable的：

ArrayList<TableRow> tableRowAl = AcmSinglton.rowHash.get(this.cfr);
// if ArrayList is null, populate the ArrayList with the TableRows  
if (tableRowAl == null){

NodeList nodeList = (NodeList) xpath.evaluate(this.xpath, xmlSource, XPathConstants.NODESET);

 for(int i=0; i<nodeList.getLength(); i++){
     TableRow tr = new TableRow(this.activity);
     tr.removeAllViews();
     tr.setId(i);
     TextView tv = new TextView(this.activity);              
     Element chapElement = (Element) nodeList.item(i);
     tv.setText(chapElement.getAttribute(this.attribute));                  
     tr.addView(tv);         
     rowsAl.add(tr);   
  }
 // put the ArrayList<TableRow> into the hashtable for reuse
 AcmSinglton.rowHash.put(this.cfr, rowsAl);

}else{
// Resuse the TableRows
    this.rowsAl.addAll(tableRowAl);             
}

当我试图将TableRow添加到tableLayout时，会得到以下错误：

ArrayList<TableRow> al = new ArrayList<TableRow>();
// get the Arraylist 
al = xmlloaded.getRowsAl();
for (int x=0; x < al.size(); x++){
    TableRow tableRow = new TableRow(this);
    tableRow = al.get(x);
    View child = tableRow.getChildAt(0);
    final TextView tx = (TextView)child;
    // I get the error here when I try to add the TableRow  
    tableView.addView(tableRow);     
}

谢谢你的帮助。

Answer 1

在第二段代码中，尝试在再次添加视图之前清除tableView。将类似的内容放在for块之前: tableView.removeAllViews()；