android - 如果我将 AsyncTask 移动到不同的文件，它会更快吗？

Question

我只是有一些关于 AsyncTask 的非常快速的问题

看看我的 AsyncTask 和它所在的类

public class ListView extends ListActivity {    


    ArrayList<HashMap<String, String>> questionList;        

     final String TAG_RESULTS = "results";
     final String TAG_QUESTION_SUBJECT = "Subject";
     final String TAG_QUESTION_NUMANSWERS = "NumAnswers";
     final String TAG_QUESTION = "question";
     final String TAG_QUESTION_CONTENT = "Content";
     final String TAG_QUESTION_CHOSENANSWER = "ChosenAnswer";
     final String TAG_ANSWERS = "Answers";
     final String TAG_ANSWER = "Answer";    
     final String TAG_ANSWERS_CONTENT = "content";      
     final String TAG_QUERY = "query";
     final String TAG_COUNT = "count";
     ProgressDialog pDialog;
     LoadAllData mTask; 

            JSONArray question = null;          
            android.widget.ListView lv;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); 
        //setContentView(R.layout.listview);        

    questionList = new ArrayList<HashMap<String, String>>(); 

    mTask = new LoadAllData();

         mTask.execute();

        }


    @Override   
    protected void onListItemClick(android.widget.ListView l, View v, int pos, long id) {
         super.onListItemClick(l, v, pos, id);  

          HashMap<String, String> item = questionList.get(pos);

          Intent i = new Intent(ListView.this, SingleListItem.class);
          i.putExtra(TAG_QUESTION_SUBJECT, item.get(TAG_QUESTION_SUBJECT));
          i.putExtra(TAG_QUESTION_CONTENT, item.get(TAG_QUESTION_CONTENT));
          i.putExtra(TAG_QUESTION_CHOSENANSWER, item.get(TAG_QUESTION_CHOSENANSWER));
          startActivity(i);

            }     

    @Override
    public void onBackPressed() {              

        if (mTask != null && mTask.getStatus() != AsyncTask.Status.FINISHED)
        {
            mTask.cancel(true);
        }          
        super.onBackPressed();

    }


    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub

     if (mTask != null && mTask.getStatus() != AsyncTask.Status.FINISHED)
     {
        mTask.cancel(true);
      }  

        super.onDestroy();

    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub


     if (pDialog != null)
     {
         if(pDialog.isShowing())
         {
             pDialog.dismiss();
         }
            super.onPause();

      }  

    }

    class LoadAllData extends AsyncTask<String, String, String> {


        @Override
        protected void onPreExecute() {
            super.onPreExecute();             
            pDialog = new ProgressDialog(ListView.this);
            pDialog.setMessage("Loading Data. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();           
        }

        protected String doInBackground(String... args) {  

            pDialog.setOnCancelListener(new DialogInterface.OnCancelListener(){ 
                public void onCancel(DialogInterface dialog) { 
                    mTask.cancel(true); 
                    finish(); 
            } 
       }); 

            try {
                Intent in = getIntent();
                String searchTerm = in.getStringExtra("TAG_SEARCH");
                String query = URLEncoder.encode(searchTerm, "utf-8");
                String URL = "http://example.com";
                JSONParsser jParser = new JSONParsser();
                JSONObject json = jParser.readJSONFeed(URL);
                try {

                    JSONArray questions = json.getJSONObject("all").getJSONArray("questions");

                    for(int i = 0; i < questions.length(); i++) {
                        JSONObject question = questions.getJSONObject(i);


                    String Subject = question.getString(TAG_QUESTION_SUBJECT);
                    String ChosenAnswer = question.getString(TAG_QUESTION_CHOSENANSWER);
                    String Content = question.getString(TAG_QUESTION_CONTENT);

                           HashMap<String, String> map = new HashMap<String, String>();

                           map.put(TAG_QUESTION_SUBJECT, Subject);
                           map.put(TAG_QUESTION_CONTENT, Content);
                           map.put(TAG_QUESTION_CHOSENANSWER, ChosenAnswer);

                           questionList.add(map);

                }


                } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

                return null;       

    }

    @Override
    protected void onPostExecute(String file_URL) {

        if(file_URL!=null && file_URL.equals("0")) {  
            pDialog.dismiss();
            Toast.makeText(ListView.this, "No data found", Toast.LENGTH_SHORT).show();
            finish();

        }else{

        if (pDialog != null && pDialog.isShowing()) pDialog.dismiss();
        ListAdapter adapter = new SimpleAdapter(getBaseContext(), questionList,
                    R.layout.listelements,
                    new String[] { TAG_QUESTION_SUBJECT }, new int[] {
                    R.id.Subject,});

            setListAdapter(adapter);                

        }}}

现在我想问的问题是，如果我将我的 AsyncTask 从当前 Activity 中取出并放在另一个文件中，它会执行我的 doInBackGround 方法更快。我问这个是因为当我的 AsyncTask 正在执行时，它需要相当长的时间才能完成，而且在我的 logcat 中还有这条消息 09-24 20:12:55.928: I/Choreographer(824) : 跳过 195 帧!应用程序可能在其主线程上做了太多工作。 在执行 AsyncTask 时填满了我的整个 logcat。我只是想知道如果我移动它会有所不同。

Answer 1

I just want to know will It make a difference if I move it.

不，不会。

此外，doInBackground() 的行为并不是您遇到困难的根源。它是其他东西，也许是您的 onPostExecute()。该错误非常明确地说明了您的问题(“可能在其主线程上做了太多工作”)，并且 doInBackground() 在另一个线程上完成了它的工作。