無法使用publishProgress方法更新AsyncTask中的進度對話框消息

Question

我已閱讀幾乎每篇關於使用publishProgress在進度對話框上設置新消息的文章，而且我根本無法使其發揮作用。

代碼：

public class LoginToApi extends AsyncTask<String, TaskProgress, String> { 

     protected void onPreExecute() { 
      pDialog = new ProgressDialog(MainActivity.this); 
      pDialog.setCancelable(false); 
      pDialog.setMessage("Logging you in..."); 
      pDialog.show(); 
     } 

     /** 
     * Creating product 
     * */ 
     protected String doInBackground(String... args) { 

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

      loginMap.put("username", un.getText().toString()); 
      loginMap.put("password", pw.getText().toString()); 
      loginMap.put("session_id", "zOhAVPADzsGk0MZiMdXUzYLErP44pVZGWdHU7yD_Paek169umn"); 

      String loginXmlString = xmlCon.createXML("login", loginMap); 
      String playlistDetails = xmlParse.makeHttprequest(url_login, loginXmlString); 

      File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS + "/adgen"); 
      File loginFile = new File(path, "login.xml"); 

      publishProgress(new TaskProgress(30, "A new update")); 

      try { 

       if(saveStringToFile(path, loginFile, playlistDetails)) { 
        Log.i("main", "login xml Saved"); 

        // Read play.xml to array 
        //xmlParse.parse(file); 

        // Get playlist using playlist ID 
        HashMap<String, String> playlistMap = new HashMap<String, String>(); 

        playlistMap.put("id", "158"); 

        String playlistDetailsString = xmlCon.createXML("playlist", playlistMap); 
        String playlist = xmlParse.makeHttprequest(url_get_playlist, playlistDetailsString); 

        File playlistFile = new File(path, "playlist.xml"); 

        try { 
         if(saveStringToFile(path, playlistFile, playlist)) { 
          Log.i("main", "playlist xml Saved"); 
         } 
        } catch (Exception e) { 
         e.printStackTrace(); 
        } 

       } 

       //Intent i = new Intent(getApplicationContext(), WebViewActivity.class); 

       //startActivity(i); 

       //finish(); 

      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      return null; 

     } 

     public void onProgressUpdate(TaskProgress progress) { 
      pDialog.setProgress(progress.percentage); 
      pDialog.setMessage(progress.message); 
     } 

     /** 
     * After completing background task Dismiss the progress dialog 
     * **/ 
     protected void onPostExecute(String file_url) { 
      pDialog.dismiss(); 
     } 

    } 

    private static class TaskProgress { 
     final int percentage; 
     final String message; 

     TaskProgress(int percentage, String message) { 
      this.percentage = percentage; 
      this.message = message; 
     } 
    } 

我得到的零個錯誤或警告，我的代碼運行正常，與正在救了我的文件，並最終異步任務完成後，被刪除的進度對話框。但是當我使用publishProgress時，對話框消息不會更新。

我使用this post作爲指導，但正如您所看到的，即使在給出解決方案之後，OP看起來也很麻煩。

我在做什麼錯？

Thanks1

Answer 1

你的方法更改爲：

public void onProgressUpdate(TaskProgress... progress) { 
    pDialog.setProgress(progress[0].percentage); 
    pDialog.setMessage(progress[0].message); 
} 

的...是很重要的。

，預計該方法的簽名是

onProgressUpdate(TaskProgress... progress)

不

onProgressUpdate(TaskProgress progress)