.notifydatasetchanged在android的可扩展列表视图中不工作

问题描述：

在xml解析中，我在刷新可扩展列表视图中的数据后调用了notifydatasetchanged，但应用程序崩溃。而我的适配器类正在扩展BaseExpandableListAdapter。我用下面的代码：.notifydatasetchanged在android的可扩展列表视图中不工作

从方法“projected_values”

class PushNotification extends AsyncTask<String, Void, Void> { 


    @Override 
    protected Void doInBackground(String... arg0) { 
     makeGetRequest(); 
     return null; 
    } 
    @Override 
    protected void onPostExecute(Void result) { 
     // TODO Auto-generated method stub 
     super.onPostExecute(result); 
     listAdapter = new ExpandableListAdapter(ct, values, scores); 
     for(int i=0;i<values.size();i++){ 

     } 
     expListView.setAdapter(listAdapter); 
     listAdapter.notifyDataSetChanged(); 

     expListView.setOnGroupClickListener(new OnGroupClickListener() { 

      @Override 
      public boolean onGroupClick(ExpandableListView parent, View v, 
        int groupPosition, long id) { 
        values.clear(); 
        projected_values(groupPosition); 
       listAdapter.notifyDataSetChanged(); 
       return false; 
      } 
     });

为组点击收听，我给的值。以下错误的logcat的节目

09-23 02:45:43.469: E/AndroidRuntime(3563): FATAL EXCEPTION: main 
09-23 02:45:43.469: E/AndroidRuntime(3563): Process: com.example.xmlparsing, PID: 3563 
09-23 02:45:43.469: E/AndroidRuntime(3563): java.lang.IllegalStateException: The content of the 
    adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes. [in ListView(2131296256, class android.widget.ExpandableListView) with Adapter(class android.widget.ExpandableListConnector)] 
09-23 02:45:43.469: E/AndroidRuntime(3563):  at android.widget.ListView.layoutChildren(ListView.java:1555) 
09-23 02:45:43.469: E/AndroidRuntime(3563):  at android.widget.AbsListView.onTouchUp(AbsListView.java:3617) 
09-23 02:45:43.469: E/AndroidRuntime(3563):  at android.widget.AbsListView.onTouchEvent(AbsListView.java:3429) 
09-23 02:45:43.469: E/AndroidRuntime(3563):  at android.view.View.dispatchTouchEvent(View.java:7690) 
09-23 02:45:43.469: E/AndroidRuntime(3563):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210) 
09-23 02:45:43.469: E/AndroidRuntime(3563):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)

请帮我

答

首先，不要在Async中创建点击监听器。下面

的错误是： -

The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes.

“确保您的适配器的内容不是从后台线程修改，但只能从UI线程”

在您的文章执行： -

listAdapter = new ExpandableListAdapter(ct, values, scores); 
    for(int i=0;i<values.size();i++){ 

    } 
    expListView.setAdapter(listAdapter); 
    listAdapter.notifyDataSetChanged();

您正在创建适配器类的新实例，并将其设置为listview并在相同的位置通知它时间。此时没有数据修改，因此您无需在此处致电通知。

我修改了我的代码..在Runonuithread中编写了notifydatasetchanged，并在oncreate中编写了onclicklisteners ..但它给出了相同的错误 – Chowdary102 2014-09-23 10:00:48

答

你们班的主要活动文件写listAdapter.notifyDataSetChanged();而不是在onPostExecute方法写它。

.notifydatasetchanged在android的可扩展列表视图中不工作

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