使用AsyncTask和进程栏

我写了一些应用程序，使用lauotprocce栏和AsyncTask使用xml进行一些工作并将其显示给用户。我想dismess回proccess后proccess酒吧将完成但有一些问题，我的代码使用AsyncTask和进程栏

错误：

FATAL EXCEPTION: AsyncTask #2 
03-17 11:25:29.559: E/AndroidRuntime(31114): java.lang.RuntimeException: An error   while executing doInBackground() 
    03-17 11:25:29.559: E/AndroidRuntime(31114): at   android.os.AsyncTask$3.done(AsyncTask.java:200) 
    03-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 
    03-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 
    03-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 
03-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
03-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
03-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
03-17 11:25:29.559: E/AndroidRuntime(31114): at java.lang.Thread.run(Thread.java:1019) 
03-17 11:25:29.559: E/AndroidRuntime(31114): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 
03-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257) 
0 3-17 11:25:29.559: E/AndroidRuntime(31114): at java.util.ArrayList.get(ArrayList.java:311) 
    03-17 11:25:29.559: E/AndroidRuntime(31114):  at com.example.News.NewsActivity$GetDataTask.doInBackground(NewsActivity.java:67) 
    03-17 11:25:29.559: E/AndroidRuntime(31114): at

我的代码是：

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.progdailog); 
mContext = this; 
    new GetDataTask().execute(); 
} 
protected void onPostExecute(Integer result) { 

     listAdapter = new CustomListAdapter(mContext, R.layout.list_item, 
       ListNews); 
     ListView lv = ((ListActivity) mContext).getListView(); 
     lv.setAdapter(listAdapter); // on test 

     lv.setTextFilterEnabled(true); 

     lv.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 
       if (position != 0) { 

        // When clicked, show a toast with the TextView text 
        String s = ReadXML.hadashotListItems.get(position - 1).link; 

        Intent intent = new Intent(NewsActivity.this, 
          WebActivity.class); 
        intent.putExtra("url", s); 

        startActivity(intent); 

       } 
      } 

      public void onScrollStateChanged(final AbsListView view, 
        final int scrollState) { 
       if (scrollState == 0) 
        listAdapter.notifyDataSetChanged(); 
      } 
     }); 

     //progDailog.dismiss(); 
     super.onPostExecute(result); 

    } 

}

行67代码：

protected Integer doInBackground(Void... params) { 
     try { 
      ReadXML = new ReadXMLFile(mContext, getIntent().getExtras() 
        .getString("urlXml")); 

      ListNews.add("NEWS"); 
      if (checkDate(ReadXML.hadashotListItems.get(0).pubDate,ReadXML.hadashotListItems.get(1).pubDate)) 
      for (int i = 0; i < ReadXML.hadashotListItems.size(); i++) { 

       ListNews.add(ReadXML.hadashotListItems.get(i).title + "\n" 
         + ReadXML.hadashotListItems.get(i).pubDate); 
      } 
      else 
       for (int i = ReadXML.hadashotListItems.size()-1; i >=0; i--) { 

        ListNews.add(ReadXML.hadashotListItems.get(i).title + "\n" 
          +  ReadXML.hadashotListItems.get(i).pubDate); 
       } 
     } catch (ParseException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (java.text.ParseException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     return 1; 
      }

我认为事端g错误的观点。跳你可以帮助改变它将工作的代码。

来源

2012-03-17 Vitaly Menchikovsky

请指向以下代码行：at com.example.News.NewsActivity $ GetDataTask.doInBackground（NewsActivity.java:67） – Egor 2012-03-17 09:50:31

GetDataTask（）是您错过的类来复制它。看看这个http://stackoverflow.com/a/9407916/1012284 – 2012-03-17 09:54:13

你的'ReadXMLFile'返回一个空列表。在你做任何事情之前，你应该做if（ReadXML.hadashotListItems == null || ReadXML.hadashotListItems.size（）== 0）return;'（如果该列表不能为空，则可以跳过空检查 – zapl 2012-03-17 10:03:32

NewsActivity.java第67行有一个IndexOutOfBoundsException。

IndexOutOfBoundsException: Invalid index 0, size is 0

您试图在没有元素时访问索引0。我认为您没有发布该代码，因此请查找该行并修复不正确的索引访问。

来源

2012-03-17 09:53:33 HXCaine

使用AsyncTask和进程栏

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