如何解决由java.lang.OutOfMemoryException导致的AsyncTask中的FATAL EXCEPTION

Question

我在AsyncTask中写了这段代码，但我不明白这个Exception。有人能告诉我我哪里错了吗？我不知道我必须做什么。以下是我的AsyncTask中的3种方法。

protected void onPreExecute() { 

     HttpParams params = httpClient.getParams(); 


     if(script.contains("appscan.php")) 
     { 
      Params.printLog(TAG,"onPreExecute appscan.php script:"+script); 
      HttpConnectionParams.setConnectionTimeout(params, 10000); 
      HttpConnectionParams.setSoTimeout(params, 10000); 
     } 
     else 
     { 
      Params.printLog(TAG,"onPreExecute script:"+script); 
      HttpConnectionParams.setConnectionTimeout(params, 120000); 
      HttpConnectionParams.setSoTimeout(params, 120000); 
     } 
    } 

    protected String doInBackground(Void... urls) { 
     String st_response=""; 
     try { 
      final HttpResponse response; 
      //synchronized (httpClient) { 
       if(request==null) 
        cancel(true); 
       String m_url; 
       if(isPost) 
       { 
        m_url=baseUrl+script; 
        HttpPost httppost = new HttpPost(m_url); 
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); 
        nameValuePairs.add(new BasicNameValuePair("id", "12345")); 

        httppost.setEntity(new UrlEncodedFormEntity((List<NameValuePair>)request)); 
        if(getClient()==null) 
        { 
         return ""; 
        } 
        response = getClient().execute(httppost); 

       } 
       else 
       { 
        String m_request=request==null?"":Uri.encode(request.toString()); 
        if(DEBUG) 
         m_url=baseUrl1+script+m_request; 
        else 
         m_url=baseUrl+script+m_request; 

        Params.printLog(TAG,"run :"+m_url); 
        HttpUriRequest request1=new HttpGet(m_url); 
        if(getClient()==null || request1==null) 
        { 
         return ""; 
        } 
        response = getClient().execute(request1); 
       } 
       StringBuilder builder = new StringBuilder(); 
       InputStream is=response.getEntity().getContent(); 
       BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8")); 
       for (String line = null; (line = reader.readLine()) != null;) { 
        builder.append(line).append("\n"); 
       } 
       is.close(); 
       st_response=builder.toString(); 
      //} 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (UnknownHostException e) 
     { 
      st_response="{\"httperr\":1}"; 
      e.printStackTrace(); 
     } 
     catch (IOException e) { 
      st_response="{\"httperr\":1}"; 
      e.printStackTrace(); 
     } 
     return st_response; 
    } 

    protected void onPostExecute(String content) { 
     if(o==null) 
      ((ResponseListener)listener).onResponseReceived(content); 
     else 
      ((ResponseWithObjectListener)listener).onResponseReceived(content,o); 
    } 

当我尝试加载大量的数据，我得到这个错误：

03-15 13:50:23.160: E/AndroidRuntime(4980): FATAL EXCEPTION: AsyncTask #4 
03-15 13:50:23.160: E/AndroidRuntime(4980): java.lang.RuntimeException: An error occured while executing doInBackground() 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at android.os.AsyncTask$3.done(AsyncTask.java:200) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.lang.Thread.run(Thread.java:1019) 
03-15 13:50:23.160: E/AndroidRuntime(4980): Caused by: java.lang.OutOfMemoryError 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:95) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:153) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.lang.StringBuilder.append(StringBuilder.java:217) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at com.qriket.qriket.httpclient.HttpAsyncTask.doInBackground(HttpAsyncTask.java:126) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at com.qriket.qriket.httpclient.HttpAsyncTask.doInBackground(HttpAsyncTask.java:1) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at android.os.AsyncTask$2.call(AsyncTask.java:185) 
03-15 13:50:23.160: E/AndroidRuntime(4980):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 

感谢

Answer 1

貌似反应是非常大的，（字符串生成器不能建整个字符串） 我建议将它存储在一个文件中保存它，并在任务完成后以块的形式读取它。