ExpandableListView未更新的AsyncTask執行完畢

之後我有一個作爲活動的一部分，創造了一個ExpandableListView：ExpandableListView未更新的AsyncTask執行完畢

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.news); 

    // create the exandable list view widget 
    newsListAdapter = new NewsListAdapter(this.getApplicationContext());  

    newsListView = (ExpandableListView) findViewById(R.id.news_list_view); 

    newsListView.setAdapter(newsListAdapter); 

    final Button homeButton = (Button) findViewById(R.id.home_btn); 

    // go back to the home page 
    homeButton.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View view) {     
      startActivity(new Intent(view.getContext(), HomeActivity.class)); 
     } 
    }); 

    newsListView.setOnGroupClickListener(new OnGroupClickListener() { 
     public boolean onGroupClick(ExpandableListView parent, View view, int groupPosition, long arg3) { 
      return false; 
     } 
    }); 

    newsListView.setOnChildClickListener(new OnChildClickListener() { 
     public boolean onChildClick(ExpandableListView parent, View view, 
            int groupPosition, int childPosition, long id) { 
      return false; 
     } 
    }); 

    showLoadingProgressDialog(); 

    downloadRssFeedTask = new DownloadRssFeedTask(); 

    downloadRssFeedTask.execute(); 
}

，你可以從代碼中看到，它熄滅，確實從RSS拉在一個AsyncTask。

的的AsyncTask完成，進度對話框被駁回，活動被告知該任務已完成：

private void responseReceived(Channel newsResponse) { 
    if (newsResponse != null)   
     newsListAdapter.buildView(newsResponse); 
    } 
    else { 
    Toast toast = Toast.makeText(this.getApplicationContext(), 
          "There is no news available at this time.", 
          Toast.LENGTH_LONG); 

     toast.show(); 
    } 
}

然而，ExpandableListView不重繪/加載數據後刷新本身，它是一個黑屏。你如何讓ExpandableListView使用RSS數據來刷新自己？我試過invalidate和refreshDrawableState，但沒有歡樂。

想法？

來源

2011-05-24 Perry Hoekstra

Doh！同時感嘆不會得到最後兩個小時的生命回覆> 神奇的答案是Adapter類中的notifyDataSetChanged（）。 – 2011-05-24 20:07:34