AlertDialog 获得焦点并弹出输入法

viewitem.bargain_price = (EditText) view.findViewById(R.id.bargain_price);
viewitem.bargain_price.setFocusable(true);  
            viewitem.bargain_price.setFocusableInTouchMode(true);  
            viewitem.bargain_price.requestFocus();  
            Timer timer = new Timer();  
               timer.schedule(new TimerTask()  
               {  
                     
                   public void run()  
                   {  
                       InputMethodManager inputManager =  (InputMethodManager)viewitem.bargain_price.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);  
                       inputManager.showSoftInput(viewitem.bargain_price, 0);  
                   }  
                     
               },  
                   998);