Android的postDelayed處理程序內的For循環？

Question

有什麼辦法可以在循環內運行一個處理程序嗎？ 我有這樣的代碼，但不工作，因爲它不等待循環，但執行的代碼正確方法：

final Handler handler = new Handler(); 


     final Runnable runnable = new Runnable() { 
      public void run() { 

       // need to do tasks on the UI thread 
       Log.d(TAG, "runn test"); 

       // 
       for (int i = 1; i < 6; i++) { 

        handler.postDelayed(this, 5000); 

       } 


      } 
     }; 

     // trigger first time 
     handler.postDelayed(runnable, 0); 

當然，當我移動延遲循環作品外的職位，但它不重複，也不執行時代我需要：

final Handler handler = new Handler(); 


     final Runnable runnable = new Runnable() { 
      public void run() { 

       // need to do tasks on the UI thread 
       Log.d(TAG, "runn test"); 

       // 
       for (int i = 1; i < 6; i++) { 
       } 

       // works great! but it does not do what we need 
       handler.postDelayed(this, 5000); 


      } 
     }; 

     // trigger first time 
     handler.postDelayed(runnable, 0); 

發現的解決方案：

我需要用的Thread.sleep（5000）在doInBackground方法一起使用asyntask：

class ExecuteAsyncTask extends AsyncTask<Object, Void, String> { 


      // 
      protected String doInBackground(Object... task_idx) { 

       // 
       String param = (String) task_idx[0]; 

       // 
       Log.d(TAG, "xxx - iter value started task idx: " + param); 

       // stop 
       try { 
        Thread.sleep(5000); 
       } catch (InterruptedException e) { 
        e.printStackTrace(); 
       } 

       // 
       Log.d(TAG, "xxx - iter value done " + param); 
       return " done for task idx: " + param; 
      } 


      // 
      protected void onPostExecute(String result) { 
       Log.d(TAG, "xxx - task executed update ui controls: " + result); 
      } 

     } 




     for(int i = 0; i < 6; i ++){ 

      // 
      new ExecuteAsyncTask().execute(String.valueOf(i)); 

     } 

Answer 1

下面的代碼應該這樣做：

final Handler handler = new Handler(); 


     int count = 0; 
     final Runnable runnable = new Runnable() { 
      public void run() { 

       // need to do tasks on the UI thread 
       Log.d(TAG, "runn test"); 


       if (count++ < 5) 
        handler.postDelayed(this, 5000); 

      } 
     }; 

     // trigger first time 
     handler.post(runnable);