再次運行AysncTask，一旦它完成了 - onPostExcecute（）

Question

要在循環觸發通過按鈕和一個名爲裝載更多連連實現

• 運行的AsyncTask命名loadMore。被執行的AsyncTask - 當loadMore的onPostExecute()

錯誤&約束

• 的logcat :: 03-07 20:31:38.330: E/AndroidRuntime(504): java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once <h2>

試圖

• 按鈕LOADMORE纔可見。在onPostExecute()內添加LOADMORE視圖。
• AsyncTask的假定行爲不是通過LOADMORE按鈕來實現的。
• 檢查是否AysncTask - loadMore RUNNING與否？ LOADMORE按鈕的內部onClickListener。
• 但隨着日誌信息它從來沒有達到LOADMORE按鈕onClickListener。

onClickListener LOADMORE按鈕）loadMore的AsyncTask的代碼::

ld. . . . . .loadMore AsyncTask. 
ll. . . . . . LinearLayout (where I'm removing and Adding LOADMORE button). 
loadMore. . . LOADMORE Button. 

public void onClick(View v) { 
     // TODO Auto-generated method stub 
     ll.removeView(loadMore); 
     //loadMore.setVisibility(View.INVISIBLE); 
     spin2.setVisibility(View.VISIBLE); 
     if(ld.getStatus()==Status.PENDING) 
     { 
      ld.execute(); 
      Log.i("PENDING", "Not yet RUNNING"); 
     } 
     else if(true) 
     { 
      while(ld.getStatus()==Status.RUNNING) 
      { 
       Log.i("loadMore Async", "LoadMore RUNNING"); 
       if(ld.getStatus()==Status.FINISHED) 
        return; 
      } 
      ld.execute(); 
     } 

    } 

---

onPostExecute（::

protected void onPostExecute(Void result) { 
adapter = new PhotosAdapter(MainActivity.this, arrPhotos); 
     gridOfPhotos.setAdapter(adapter); 

     spin2.setVisibility(View.GONE); 

     ll.addView(loadMore); 
     Log.i("loadMore-Async", "Adding LoadMore button again"); 
     Log.i("loadMore-Async", "LoadMore AsyncTask onPost() finished"); 
     loadMore.setOnClickListener(n); 
     Log.i("loadMore-Async", "Adding Listener to LoadMore"); 
    } 

任何幫助，將不勝感激!!

Answer 1

通過以下實現

• 創建一個新的AsyncTask這將是動態的實例化。
• 循環創建新的AysncTask通過創建我的loadMore AsyncTask數組來解決。

代碼::

loadMorePhotos[] lmd=new loadMorePhotos[1000]; 

LOADMORE按鈕::

View.OnClickListener n=new View.OnClickListener() { 

    @Override 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 
     ll.removeView(loadMore); 
     //loadMore.setVisibility(View.INVISIBLE); 
     spin2.setVisibility(View.VISIBLE); 
     if(ld.getStatus()==Status.PENDING) 
     { 
      ld.execute(); 
      Log.i("loadMoreAsync", "new AsyncTask : 0"); 
      Log.i("PENDING", "Not yet RUNNING"); 
     } 
     else if(true) 
     { 
      Log.i("loadMoreAsync", "Creating new AsyncTask"); 
      lmd[j]=new loadMorePhotos(); 
      lmd[j].execute(); 
      Log.i("loadMoreAsync", "Creating LoadMore AsyncTask :"+j); 
      j++; 

     } 

    } 
}; 

Answer 2

您不能執行的AsyncTask兩次。從文檔引用「任務只能執行一次（如果嘗試執行第二次執行，將拋出異常）」，鏈接http://developer.android.com/reference/android/os/AsyncTask.html

除了創建新任務並執行它之外，沒有其他選擇。