OnListItemClick只能工作一次

Question

我正在做一個列表視圖，當你點擊一個項目時，它顯示一個alertdialog有兩個選項，並且在他們選擇一個選項後，它將他們帶回列表視圖，在那裏他們可以再次使用另一個選擇。出於某種原因，一旦我點擊一個項目，如果我點擊肯定按鈕（其中的代碼），然後嘗試點擊另一個項目，警報對話框不會彈出。有誰知道爲什麼會發生？代碼如下：

protected void onListItemClick(ListView l, View v, int position, long id) { 
     final int i = position; 
     try { 
      new AlertDialog.Builder(this) 
      .setTitle("Download") 
      .setMessage("You have selected the level " + jArray.getJSONObject(i).getString("level_name") + ". Would you like to save it?") 
      .setPositiveButton("Save", new DialogInterface.OnClickListener(){ 
       public void onClick(DialogInterface dialog, int which) { 
        try { 
         saveLevel(jArray.getJSONObject(i).getString("level_name"),jArray.getJSONObject(i).getInt("id")); 
        } catch (JSONException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
        } 
        return; 
       } 
      }) 
      .setNegativeButton("Cancel",new DialogInterface.OnClickListener(){ 
       public void onClick(DialogInterface dialog, int which) { 
        return; 
       } 
      }) 
      .show(); 
     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     super.onListItemClick(l, v, position, id); 
    } 

如果您需要其他信息請告訴我！提前致謝！

威廉

編輯

從我所知道的，它是在saveLevel功能發生的事情，我張貼下面

public void saveLevel(String i, int id) 
{ 
    InputStream is = null; 
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
    nameValuePairs.add(new BasicNameValuePair("uid","demo")); 
    String result = ""; 
    try 
    { 
     HttpClient httpclient = new DefaultHttpClient(); 
     HttpPost httppost = new HttpPost("www.example.com/stuff.php"); 
     httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
     HttpResponse response = httpclient.execute(httppost); 
     HttpEntity entity = response.getEntity(); 
     is = entity.getContent(); 

     BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 
     StringBuilder sb = new StringBuilder(); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 
      sb.append(line + "\n"); 
     } 
     is.close(); 

     result=sb.toString(); 
     jArray = new JSONArray(result); 
     File exst = Environment.getExternalStorageDirectory(); 
     String exstPath = exst.getPath(); 

     File filePath = new File(exstPath+"/Platformer/Downloaded"); 
     boolean success = filePath.mkdir(); 
     String path = filePath.getAbsolutePath() + "/" + i + ".xml"; 
     File newxmlfile = new File(path); 
     try 
     { 
      newxmlfile.createNewFile(); 
     } 
     catch (IOException e) 
     { 
      e.printStackTrace(); 

     } 
     FileOutputStream fileos = null;   
     try 
     { 
      fileos = new FileOutputStream(newxmlfile); 
     } 
     catch(FileNotFoundException e) 
     { 
      Log.e("FileNotFoundException", "can't create FileOutputStream"); 
      return; 
     } 
     OutputStreamWriter output = new OutputStreamWriter(fileos); 
     output.write(jArray.getJSONObject(0).getString("level_data")); 
     output.flush(); 
     output.close(); 
    } 
    catch(Exception e) 
    { 
     Log.e("log_tag", "Error parsing data "+e.toString()); 
    } 
} 

Answer 1

你saveLevel()功能也做了很多的事情（網絡訪問，文件訪問），這些不適合UI線程。您應該將這些東西分成後臺線程，最好使用AsyncTask（tutorial）。

當您嘗試點擊另一個列表項時，很可能您的程序仍然卡在saveLevel()中。如果你想檢查這個假設是否真的如此，只需在saveLevel()的開頭放一條return;行，看看你的對話框是否按預期彈出。