AsyncTask导致FC研究(5)

        } 
 
         
         
    } 
     
    static class ViewHolder { 
        TextView tv; 
        ImageView iv; 
    } 
     
    class GetGridDataTask extends FifoAsyncTask<Void, Void, Void> { 
         
        protected void onPreExecute () { 
            mData.clear(); 
            mAdapter.notifyDataSetChanged(); 
             
            showDialog(DIALOG_PROGRESS);//打开等待对话框  
        } 
         
        @Override 
        protected Void doInBackground(Void... params) { 
             
            try { 
                Thread.sleep(500);//模拟耗时的网络操作  
            } catch (InterruptedException e) { 
                e.printStackTrace(); 
            } 
            for(int i = 0; i < 200; i++) { 
                HashMap<String, Object> hm = new HashMap<String, Object>(); 
                hm.put("title", "Title"); 
                mData.add(hm); 
            } 
             
            return null; 
        }